VM-5 SERIES MONITOR INSTRUCTION MANUAL

Transcription

1 MANUAL E4.0 Published in Jun.1996 Revised in Aug.2009 VM-5 SERIES MONITOR MODEL VM-5T DUAL THRUST MONITOR INSTRUCTION MANUAL

2 SAFETY CONVENTIONS VM-5T For safe operation... Thank you for using our VM-5 Series Monitor. SHINKAWA Sensor Technology applies strict quality control and inspections to ensure the high reliability of its products. This instruction manual contains descriptive information, specifications, and operating, setting, and adjusting procedures. Please study the contents of this manual and related manuals thoroughly before installing or operating the equipment, and keep it handy for future reference. "Safety Conventions" Please thoroughly study the following section entitled "Safety Conventions" before operating the equipment. The safety symbols explained in this section are placed outside the left margin next to the text to which they apply. This unit is designed for use by specialists or persons thoroughly familiar with the field. Make sure that the end user receives the Instruction Manual delivered with this unit. Before use... When the unit is received, inspect it for damage suffered in transport and check whether it is the item you ordered. In the unlikely event that it was damaged in transport or does not function according to specifications, please contact the SHINKAWA Office or dealer nearest you. Store the unit under the ambient conditions given in the specification. Avoid places where it is exposed to high humidity or corrosive gases. i

3 SAFETY CONVENTIONS VM-5T Make it a rule to follow the instructions given in this manual. This manual contains important information designed to prevent personal injury and property damage, and ensure safe operation of the equipment. Familiarize yourself with the signs and symbols explained below before proceeding to read the manual, and observe the instructions given. Explanation of signs Symbols WARNING CAUTION Explanation Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury. It may also be used to permit for property-damage-only accidents. "Serious injury" refers to such injuries as loss of eyesight, injuries, burns (due to heat or cold), electric shock, fractures, and poisoning, that have permanent aftereffects and require hospitalization or long-term outpatient treatment. "Moderate or minor injury" refers to such injuries as burns and electric shock that do not require hospitalization or long-term outpatient treatment. "Property-damage-only accidents" refers to consequential damage related to destruction of property and damage to the equipment. Explanation of symbols Symbols Explanation Indicates a prohibited action. Details are given in the text next to the symbol. Indicates a mandatory action. Details are given in the text next to the symbol. ii

4 SAFETY CONVENTIONS VM-5T To ensure safe use of this equipment, strictly observe the safety precautions provided in this manual, as well as installation methods and methods of use stipulated by laws and regulations. SHINKAWA Sensor Technology will not be liable for damage, etc. due to methods of use contravening to the instructions provided here. Safe use WARNING Connect earth wire PROHIBITION Make sure to ground. May cause electric shock or malfunction. Make sure to turn the power off before any wiring work. Will cause electric shock. CAUTION MANDATORY MANDATORY MANDATORY PROHIBITION PROHIBITION PROHIBITION PROHIBITION PROHIBITION PROHIBITION Connect the input signal within the voltage range described in the specification to the input terminals. Will cause damage and malfunction of the instrument. Install the monitor unit and its relay module unit in the same location in the instrument rack. Will cause damage to the instrument and malfunction of the turbine monitoring system. A printed circuit board and electronic products may receive damage with the static electricity of a human body. Touch the metal part once and discharge your static electricity before dealing with it. Will cause damage and malfunction of the instrument. Do not touch parts and soldered surfaces of the monitor unit. Will cause damage and malfunction of the instrument. The monitor unit is a precision instrument. Take care not to expose it to excessive shock or vibration. Do not change the parameter settings during operation. May cause unexpected alarm output. Do not pull out the face plate during operation. Will cause damage to the instrument and malfunction of the turbine monitoring system. Do not measure insulation resistance and dielectric strength other than those at places specified. Will cause damage to the instrument. Do not remodel this monitor unit without permission. Otherwise the guarantee can not be made. iii

5 SAFETY CONVENTIONS VM-5T EMC(Electro-magnetic compatibility) The EMC of each VM-5 Series monitor is evaluated by various noise tests. However, its characteristics may vary with on environmental conditions such as the magnitude of noise, ambient temperature, humidity and the arrangement of equipment. For the above reason, when operating the monitor, please observe the following CAUTION. CAUTION MANDATORY MANDATORY MANDATORY The monitor unit should be operated by specialists or personnel who have knowledge of it. When a shielded cable is used, the length of the unshielded cable section should be less than 100mm. For each relay used near this monitor unit, devices related to this monitor unit or signal cables connecting the monitor unit and these devices, install a surge killer. MANDATORY Firmly tighten each screw used for mounting each unit. In additional, always close the face plate for the monitor unit, then fix it with knurled screws. MANDATORY PROHIBITION In order to prevent the system from its malfunction when the monitor unit fails, provide the systematic interlock function. Do not wire input signal cables in parallel with control and power cables. It is recommended that separated wire ducts be used for these cables. Do not use any radio equipment near the monitor unit. PROHIBITION Noise filter Noise transmitted through in each cable may be rejected to some extent by inserting a ferrite core in the cable (note 1). If the cable passes through noisy surroundings, it is recommended that such a noise prevention device is used. (note 1) ZCAT : TDK iv

6 TABLE OF CONTENTS VM-5T 1. GENERAL INFORMATION SPECIFICATIONS OUTLINE DRAWING INTERCONNECTION 4-1 INTRINSIC SAFETY EXPLOSION-PROOF CONSTRUCTION N-INTRINSIC SAFETY EXPLOSION-PROOF CONSTRUCTION DESCRIPTION OF FUNCTIONS 5-1 DISPLAY ALARM FUNCTIONS DANGER(DAN)ALARM ALERT(ALE)ALARM OK(INPUT ABRMAL)ALARM VOTING FUNCTION ZERO SHIFT FUNCTION ALARM DELAY FUNCTION FIRSTOUT DISPLAY BYPASS FUNCTION POWER ON TIMER MODE ALARM RELAY MODE ALARM RESET MODE MONITOR OUTPUT RECORDER OUTPUT SELF-DIAGSTIC FUNCTION POWER SEQUENCE TIMED OK CHANNEL DEFEAT DESCRIPTION OF PARTS 6-1 DESCRIPTION OF FRONT PANEL/SIDE VIEW DESCRIPTION OF PARTS DESCRIPTION OF LCD DISPLAY v

7 TABLE OF CONTENTS VM-5T 7. PARAMETER SETTING 7-1 WITHDRAWAL OF FACE PLATE BASIC KEY OPERATIONS DIP SWITCH SETTING PARAMETER SETTING PARAMETER SETTING ADJUSTMENT OF ZERO SHIFT FUNCTIONAL DIAGRAM 8-1 BLOCK DIAGRAM FUNCTIONAL BLOCK DIAGRAM MAINTENANCE 9-1 RECOMMENDED MAINTENANCE EQUIPMENT VERIFICATION OF OK(INPUT ABRMAL ALARM) OPERATION VERIFICATION OF DANGER(DAN)/ ALERT(ALE)ALARM OPERATION VERIFICATION OF MEASURED VALUE AND RECORDER OUTPUT ADJUSTMENT OF MEASURED VALUE AND RECORDER OUTPUT ZERO SPAN REPLACEMENT OF ALUMINUM ELECTROLYTIC CAPACITOR REPLACEMENT OF LCD UNIT LCD CONTRAST ADJUSTMENT LCD BACKLIGHT ADJUSTMENT TROUBLESHOOTING 10-1 LCD DISPLAY CONTENT ABRMAL OK DISPLAY FLASHES MEASURED VALUE ABRMAL OK(INPUT ABRMAL ALARM)DOES T OPERATE ALERT(ALE)ALARM DOES T OPERATE DANGER(DAN)ALARM DOES T OPERATE ERRORNEOUS OPERATION OF DANGER(DAN)/ ALERT(ALE)ALARM RECORDER OUTPUT vi

8 1. GENERAL INFORMATION VM-5T OVERVIEW This is a highly reliable dual channel thrust monitor which monitors the bearing vibration of rotating machinery. Both a 10-slot rack mounting type and a single-unit independent type with a built-in power supply are available so that it can respond flexibly to any system design from medium and small scale rotating machinery to TSI. The monitor inputs thrust signals from the VK Series Vibration Transducers and displays them on LCD. It can also set ALERT and DANGER alarm levels in any high and low limit directions independently to detect machine failures early on and inform the operator of these failures, thereby preventing damage to the thrust bearing in advance. It has a built-in voting logic function which outputs a contact signal corresponding to two channels by OR for an ALERT alarm or two channels by AND for a DANGER alarm, thereby ensuring highly reliable shaft position monitoring. It also has a built-in self-diagnostic function to inform the operator of input transducer failures, thereby preventing rotating machinery from false shutdowns. FEATURES Conforms to API St d 670 The monitor is available as a single unit independent type or a rack mounting type. Has a self-diagnostic function. Allows the operator to change each setting even in the field. Important information such as measured value, alarm set value and gap voltage is normally displayed. Can isolate recorder output (option). LED display / contact output (DANGER / ALERT alarm). LED display / contact output (Input abnormal alarm). Mandatory Caution For alarm output wiring proceed as described in the instruction manuals for the VM-5G Single Unit Instrument Rack and VM-5Y Relay Module Unit used in combination with this monitor unit. If megger test is made on the signal cable between transducer and monitor, disconnect the cable from transducer and monitor. Be sure to discharge the charged electric load before connecting the cable to the transducer and monitor. If this caution is not adhered to, the transducer and monitor could be damaged. Prior to factory shipment, the timed OK channel defeat function is set to OFF. Therefore, the ALERT and DANGER alarms are not cut off even if the OK alarm is ready to be output. -1-

9 2. SPECIFICATIONS VM-5T No entry if additional Model Code / Additional Spec. Code( spec. code is not specified. ) VM-5T- 0 - Monitor range Input signal Frequency response Polarity*1 Recorder output Alarm reset Alarm reset Alarm reset (DANGER) (ALERT) (OK) to 0 to +0.5mm VK-202A, 0 DC to 0.5Hz 1 Direct 0 4 to 20mADC 0 AUTO-RESET 0 AUTO-RESET 0 AUTO-RESET to 0 to +1.0mm 1 VK-202P, 2 Reverse 1 1 to 5VDC 1 SELF-HOLD 1 SELF-HOLD 1 SELF-HOLD to 0 to +2.0mm FK-202F Output card 4-25 to 0 to +25mils 2 VK-302P 2 /IS or /RE 5-40 to 0 to +40mils 3 VK-452A,FK-452F Note) *1 VK option VC 6-80 to 0 to +80mils 4 VK-602P Indication and rec. output Indication and rec. output 5 VC Series Polarity Polarity Toward sensor Away from sensor Toward sensor Away from sensor Note) When using monitor range 2(-1.0 to 0 to +1.0mm) or 5(-40 to 0 to Direct Increase Decrease Direct Decrease Increase +40mils), combined with input signal 1 and intrinsically safe explosion proof construction, the OK alarm set point falls within the Reverse Decrease Increase Reverse Increase Decrease range. Therefore, use the monitor within 90% of the range Relay mode (DANGER) RMALLY 0 0 DE-ENERGIZED RMALLY 1 1 ENERGIZED Relay mode (ALERT) RMALLY 0 DE-ENERGIZED RMALLY 1 ENERGIZED Note) *2 It is necessary to set all monitor units in the same rack in first out function ON when it is used first out function. Relay mode Alarm Delay time Alarm delay time (OK) (DANGER) (ALERT) Alarm output type First out*2 RMALLY 0 3 sec. 0 3 sec. CH1 : 2 points(danger1,alert1)h,l are OR output 0 OFF 1 DE-ENERGIZED 1 1 sec. 1 1 sec. CH2 : 2 points(danger2,alert2)h,l are OR output 1 ON RMALLY 2 6 sec. 2 6 sec. CH1 : 4 points (H-DANGER,H-ALERT,L-ALERT, ENERGIZED 3 None 3 None 2 L-DANGER) CH2 : None Voting logic 3 DANGER : AND output of CH1,2 ALERT : OR output of CH1,2 Voting logic 4 DANGER : OR output of CH1,2 ALERT : AND output of CH1,2 /TRP/EX /LG 5 Special alarm logic(option) /(IS or RE )/5G /CEM Isolate output Special alarm logic Recorder output Input power supply Tropical Sensitivity option requirements spec. DANGER ALERT correction 1CH 2CH 1CH 2CH 0 4 to 20mADC 2 0 to -10VDC 0 85 to 264VAC 1 TIIS(IEC) DANGER DANGER ALERT ALERT 1 1 to 5VDC 3 0 to 10VDC 1 24VDC 2 FM DANGER T OK ALERT 2 0 to -10VDC 4 0 to -5VDC 2 110VDC 4 CSA 1 T OK DANGER ALERT 3 0 to 10VDC 5 0 to 5VDC 5 ATEX T OK T OK ALERT T OK 4 0 to -5VDC T OK ALERT 5 0 to 5VDC When recorder output code 2 is selected, specify this option code. Note) Input abnormal alarm is not applicable in case of VC input signal. ALARM SET VALUE H-DANGER1 : H-ALERT1 : L-ALERT1 : L-DANGER1 : H-DANGER2 : H-ALERT2 : L-ALERT2 : L-DANGER2 : Unless specified otherwise, preset to : H-DANGER : 100% of monitor range H-ALERT : 90% of monitor range L-ALERT : 10% of monitor range OTHERS ALARM SET POINT ALARM SET RANGE ALARM SET ACCURACY ALARM SET REPEATABILITY ALARM OUTPUT MEASURED VALUE Ordering Information -2- CE marking ALARM INDICATOR DANGER : (red LED) ALERT : (yellow LED) ABR. ALARM OK : (green LED) INDICATOR BYPASS INDICATOR BYPASS : (red LED) TRANSDUCER INPUT VK-202A,VK-202P,FK-202F,VK-302P,VK-452A,FK-452F, VK-602P,VC Series Number of input points : 2 points INPUT IMPEDANCE Approx. 50kΩ EXTERNAL CONTACT INPUT Contact type : Dry contact Contact for external reset (FROM REAR PANEL) BAR GRAPH METER Recorder output conversion accuracy ±2.5% of F.S. L-DANGER : 0% of monitor range ZERO SHIFT 0 to 100% of monitor range DIGITAL METER Recorder output conversion accuracy ±1.0% of F.S. RECORDER OUTPUT CONVERSION ACCURACY ±0.5% of F.S. at 25 C ±2.0% of F.S. at 0 to 65 C Standard Specifications 8 points (H-DANGER1,H-ALERT1,L-DANGER1,L-ALERT1, H-ALERT2,H-DANGER2,L-ALERT2,L-DANGER2) 0 to 110% of monitor range ±1.0% of F.S. or less LOOP ACCURACY FOR MONITOR + SENSOR (if calibrated as a loop) RECORDER OUTPUT (FROM REAR PANEL) ±0.1% of F.S. or less MONITOR OUTPUT (FROM FRONT, REAR 5 points (DANGER1,ALERT1,ALERT2,DANGER2,OK) or PANEL) 6 points (DANGER1,ALERT1,ALERT2,DANGER2,OK1,OK2) TEMPERATURE (H,L are OR output) RANGE LCD digital meter with 5 digits (7 segments, with back light) LCD bar graph meter (40 segments, with back light) * Measurement value and alarm set value are indicated on the digital meter and bar graph meter simultaneously. Standard Specifications ± (0.5% of F.S. + sensor accuracy) or less : In case of sensor calibrated with standard target SCM440. ± 5% of F.S. or less : In case of sensor calibrated with target except SCM440. Voltage or current output proportional to monitor range 1 to 5VDC (output impedance : 250Ω) 4 to 20mADC (max. load resistance : 500Ω) 0 to -10VDC*,0 to 10VDC*,0 to -5VDC*,0 to 5VDC* (output impedance : 100Ω) (*option) Number of output points : 2 points Input signal is output via a buffer amplifier. Signal level : -0.8 to -22VDC(VK), 0 to 5VDC(VC) Output impedance : 100Ω (load resistance 50kΩ or more) Operating temperature : 0 to 65 C (32 to 149 F REF.) Storage temperature : -30 to +85 C (-22 to +185 F REF.) Relative humidity : 20 to 95% (noncondensing) MATERIAL AND FINISH Face plate : Aluminum Munsell N-4.0 (equiv.) MASS Monitor : max.0.7kg (including single unit instrument rack : max.2.5kg) 39506E4.2

10 2. SPECIFICATIONS VM-5T * Thrust polarity Relationship between rotor movement and sensor Polarity Display, Recorder output Toward Sensor LCD display Output Recorder output Sensor Direct Increment Time LCD display Output Recorder output Reverse Decrement Time Away from Sensor LCD display Output Recorder output Sensor Direct Decrement Time LCD display Output Recorder output Reverse Increment Time Mandatory After having mounted and adjusted the sensor, make sure to check the polarity of the monitor display by moving the rotor, inserting a thin metal plate or the like between sensor and target. -3-

11 3. OUTLINE DRAWING VM-5T No. Name No. Name 1 LCD display 8 Tag, Ser.No. plate 2 DANGER lamp 9 LCD board 3 ALERT lamp 10 Slide frame 4 OK lamp 11 Main board frame 5 BYPASS lamp 12 Main board 6 Monitor output connector 13 DIN connector (64pin) 7 Name plate Finish Mass Face plate : Munsell N-4.0 (equiv.) Max. 0.7kg (Max. 1.6lb REF.) Unless otherwise specified, units are in millimeters (mm) and grams (g). Reference dimensions in parentheses are in inches (in) and pounds (lb) -4-

12 4. INTERCONNECTION VM-5T Do not use the blank terminals. Prohibition Mandatory INTERCONNECTION OF TRANSMISSION CABLE Connection of signal transmission cable For interconnection between the VK driver and the monitor, or between the VK driver and safety barrier, and safety barrier and monitor, make sure to use 3-core shielded cables or pair shielded standard 3-wire instrument cables, since the signal transmitted is weak. (Do not use unshielded cables or non-pair shielded multicore cables as the measured values could be affected by external noise.) Recommended cables Cable Recommended Note CVVS (3-core shielded cable) Conduit pipe Shielded wire INSTRUMENT CABLE (Pair shielded standard 3-wire) Conduit pipe Outside shielded Shielded wire Excellent Good Recommended cabling as per API st d 670 Normal: Silver-plated braid Recommended: Copper tape shielded (Core wire: Soft copper wire) Use conduit pipe (cable rack) for wiring. Although vibration and displacement signals can be transmitted in one instrument cable, use separate cables, because a high vibration signal exerts injurious influence over other displacement and vibration signals. Recommended: Outside shield of aluminum or copper tape. Provide separate cabling for pulse signals (phase marker, revolution) and for Mandatory displacement and vibration signals. Avoid running signal transmission cables together with control and power cables. Install all cables in conduit pipes or on cable racks. -5-

13 4. INTERCONNECTION VM-5T 4-1 INTRINSIC SAFETY EXPLOSION-PROOF CONSTRUCTION MODEL VK AND VM-5G OR VM-5Y1,2,3 VK-202A input : TIIS Ex ia IIC T6 Safety Barrier Terminals Monitor Terminals Signal name Wire no. Hazardous area Safe area 1ch 2ch No. No. Terminal name No. Terminal name No. Output A 4 2 IN A1 IN B1 Common, Shield B, D Earth Earth COM A2 COM B2 Power C 3 1 PWR A3 PWR B3-6-

14 4. INTERCONNECTION VM-5T Mandantory Be sure to observe the following cautions at the time of interconnection. Note No. in drawing 1) 2) 3) 4) 5) Caution Use flexible armored cables as sensor cables and extension cables, unless these cables are not at risk for damage. Allowable bending radius Without armor : 30 mm (1.18 in REF.) With armor : 50 mm (1.97 in REF.) Allowable tension : 98.1N (10 kgf REF.) To insulate the connector, cover it with the supplied shrink tube (insulating sleeve) or insulating tape. Take measures to prevent oil or water from entering the insulating sleeve or tape. Make sure to fix the terminal cover on the terminal block of the VK driver. Install the driver in the driver housing and fix the cable securely with a clamp near the teminal block. Keep the unshielded portion of cables at connecting parts as short as possible. (less than 100mm recommended.) Connect the shielded wires to the COM terminal. Use a 3-core shielded cable with AWG No. 14 to No. 18 gage stranded conductors for wiring between the VK driver and the safety barrier, and between the safety barrier and the monitor (max. length 500 m (max. length 1,640ft REF.) [Cw 0.134µF, Lw 0.71mH]). In the case of other Intrinsic Safety, refer to an Instruction Manual of each Transducer. Keep wiring away from power and control lines to prevent noise interference. 6) Install the safety barrier in the enclosure. Warning Make sure to turn the power off before wiring work to prevent accidents due to electric shock. If wired according to this drawing, the resistance of the safety barrier causes the input voltage of the monitor to drop by about 1%. -7-

15 4. INTERCONNECTION VM-5T MODEL FK AND VM-5G OR VM-5Y1,2,3 FK-202F input : TIIS Ex ia IIC T4 Safety Barrier Terminals Monitor Terminals Signal name Wire no. Hazardous area Safe area 1ch 2ch No. No. Terminal name No. Terminal name No. OUT A 4 2 IN A1 IN B1 COM B Earth Earth COM A2 COM B2-24V C 3 1 PWR A3 PWR B3 Shield (COM) D Earth Earth COM A2 COM B2-8-

16 4. INTERCONNECTION VM-5T Mandantory Be sure to observe the following cautions at the time of interconnection. Note No. in drawing 1) Caution To insulate the connector, cover it with the supplied shrink tube (insulating sleeve) or insulating tape. Take measures to prevent oil or water from entering the insulating sleeve or tape. Use flexible armored cables as sensor cables and extension cables, unless these cables are not at risk for damage. 2) Allowable bending radius Without armor With armor With fluoro resin coating armor Allowable tension : 30 mm (1.18 in REF.) : 50 mm (1.97 in REF.) : 75mm : 98.1N (10 kgf REF.) 3) 4) Keep the unshielded portion of cables at connecting parts as short as possible. (less than 100mm recommended.) Connect the shielded wires to the COM terminal. Use a 3-core shielded cable with AWG No. 16 to No. 18 gage stranded conductors for wiring between the FK driver and the safety barrier, and between the safety barrier and the monitor (max. length 500 m (max. length 1,640ft REF.) [Cw 0.09µF, Lw 1.84mH]). In the case of other Intrinsic Safety, refer to an Instruction Manual of each Transducer. Keep wiring away from power and control lines to prevent noise interference. 5) Install the safety barrier in the enclosure. 6) Remove the insulation so there is 9mm of exposed wire, and twist the wire. Do not finish terminals of the wire with solder. Make sure to turn the power off before wiring work to prevent accidents due to Warning electric shock. If wired according to this drawing, the resistance of the safety barrier causes the input voltage of the monitor to drop by about 1%. -9-

17 4. INTERCONNECTION VM-5T 4-2 N-INTRINSIC SAFETY EXPLOSION-PROOF CONSTRUCTION MODEL VK AND VM-5G OR VM-5Y1,2,3 Connected terminals Signal name Wire no. CH1 CH2 Terminal name No. Terminal name No. Output A IN A1 IN B1 Common, Shield B, D COM A2 COM B2 Power C PWR A3 PWR B3-10-

18 4. INTERCONNECTION VM-5T Mandantory Be sure to observe the following cautions at the time of interconnection. Note No. in drawing 1) 2) 3) Caution To insulate the connector, cover it with the supplied shrink tube (insulating sleeve) or insulating tape. Take measures to prevent oil or water from entering the insulating sleeve or tape. Allowable bending radius Without armor : 30 mm (1.18 in REF.) With armor : 50 mm (1.97 in REF.) Allowable tension : 98.1N (10 kgf REF.) Connect the shielded wires to the COM terminal. Keep the unshielded portion of cables at connecting parts as short as possible. (less than 100mm recommended.) Use a 3-core shielded cable with AWG No. 14 to No. 18 gage stranded conductors for wiring between the VK driver and the monitor. Do not wire the cables together in high tension ducts. Warning Make sure to turn the power off before wiring work to prevent accidents due to electric shock. -11-

19 4. INTERCONNECTION VM-5T MODEL FK AND VM-5G OR VM-5Y1,2,3 Connected terminals Signal name Wire no. CH1 CH2 Terminal name No. Terminal name No. OUT A IN A1 IN B1 COM B COM A2 COM B2-24V C PWR A3 PWR B3 Shield (COM) D COM A2 COM B2-12-

20 4. INTERCONNECTION VM-5T Mandantory Be sure to observe the following cautions at the time of interconnection. Note No. in drawing 1) 2) 3) 4) Caution To insulate the connector, cover it with the supplied shrink tube (insulating sleeve) or insulating tape. Take measures to prevent oil or water from entering the insulating sleeve or tape. Allowable bending radius Without armor : 30 mm (1.18 in REF.) With armor : 50 mm (1.97 in REF.) With fluoro resin coating armor : 75mm Allowable tension : 98.1N (10 kgf REF.) Connect the shielded wires to the COM terminal. Keep the unshielded portion of cables at connecting parts as short as possible. (less than 100mm recommended.) Use a 3-core shielded cable with AWG No. 16 to No. 18 gage stranded conductors for wiring between the FK driver and the monitor. Do not wire the cables together in high tension ducts. Remove the insulation so there is 9mm of exposed wire, and twist the wire. Do not finish terminals of the wire with solder. Warning Make sure to turn the power off before wiring work to prevent accidents due to electric shock. -13-

21 5. DESCRIPTION OF FUNCTIONS VM-5T 5-1 DISPLAY Thrust displacement values, alarm set values, and sensor set gap voltage are normally displayed on individual LCD for each channel. 5-2 ALARM FUNCTIONS ALERT alarm, DANGER alarm and OK (input abnormal) alarm are contact-output and displayed on LEDs. Alarm limit values are input and displayed separately for each channel. Alarm is output separately for each channel, if the VM-5G Single Unit Instrument Rack and VM-5Y Relay Module Unit have an SPDT relay contact arrangement. In case of a DPDT relay, alarm outputs by OR voting logic between CH1 and CH DANGER (DAN) ALARM A thrust value exceeding the DAN alarm set values causes alarm output at the DAN contact and DAN alarm display. For details refer to 7. PARAMETER SETTING on page ALERT (ALE) ALARM A thrust value exceeding the ALE alarm set values causes alarm output at the ALE contact and ALE alarm display. For details refer to 7. PARAMETER SETTING on page OK (INPUT ABRMAL) ALARM When the level of the signal from the transducer becomes abnormal, OK alarm outputs and LCD is flashing. This condition is maintained by the off-delay timer for approx. 15 sec. after the level of the transducer signal has returned to normal. 5-6 VOTING LOGIC FUNCTION DANGER alarm is output if both channels are AND, and ALERT alarm is output if both channels are OR. 5-7 ZERO SHIFT FUNCTION Shifts the thrust point on the LCD display to the desired position. For details refer to 7. PARAMETER SETTING on page ALARM DELAY FUNCTION To prevent output of false DAN/ALE alarm due to noise, etc., a delay time can be specified separately for each channel. For details refer to 7. PARAMETER SETTING on page

22 5. DESCRIPTION OF FUNCTIONS VM-5T 5-9 FIRSTOUT DISPLAY Installation in VM-5H3, 5W1 Instrument Rack Causes the alarm lamp of the channel that first output alarm to flash. Installation in VM-5G Single Unit Instrument Rack Causes the lamp of the alarm first output to flash. For details refer to 7. PARAMETER SETTING on page 20. An alarm lamp set flashing by the First-out Display function cannot be reset by pressing the RES (RESET) key. (Reset by shorting between the RES and COM terminals.) 5-10 BYPASS FUNCTION Used to disable alarm output while setting the alarm parameters, or during maintenance/inspection work. The alarm BYPASS lamp flashes or lights during this operation. Set by turning the BYPASS switch to ON. Warning While BYPASS FUNCTION is in operation, the machine is not protected DANGER BYPASS Cuts off DANGER alarm. While cut off, the DANGER alarm and BYPASS lamps are flashing. This function is activated by means of the DANGER BYPASS switch. For details refer to 7. PARAMETER SETTING on page 20. If mounted in the VM-5H3 or VM-5W1 Instrument Rack, all units in the instrument rack can be set collectively to DANGER BYPASS. For details refer to VM-5H3 or VM-5W1 Instrument Rack instruction manual CH1 BYPASS DANGER alarm, ALERT alarm, OK alarm, display and recorder output of CH1 are cut off. While cut off, the OK lamp goes off and the BYPASS lamp lights. This function can be activated by means of the CH1 BYPASS switch. For details refer to 7. PARAMETER SETTING on page CH2 BYPASS DANGER alarm, ALERT alarm, OK alarm, display and recorder output of CH2 are cut off. While cut off, the OK lamp goes off and the BYPASS lamp lights. This function can be activated by means of the CH2 BYPASS switch. For details refer to 7. PARAMETER SETTING on page POWER ON TIMER MODE Operates for approx. 5sec. after the power is turned on. In this mode, all alarm functions are disabled and the BYPASS and OK lamps flash. -15-

23 5. DESCRIPTION OF FUNCTIONS VM-5T 5-12 ALARM RELAY MODE Each alarm contact can be set to either normally de-energized or normally energized. Alarm contact operation Monitor power Monitor power ON OFF Normal state Alarm state contact RMALLY DE-ENERGIZED OPEN OPEN CLOSE contact RMALLY ENERGIZED OPEN CLOSE OPEN NC contact RMALLY DE-ENERGIZED CLOSE CLOSE OPEN NC contact RMALLY ENERGIZED CLOSE OPEN CLOSE For details refer to 7. PARAMETER SETTING on page ALARM RESET MODE The automatic reset of all alarm output and alarm lamps can be set when the thrust value or input signal return to normal. In addition to above, the self-holding function can be also set for each alarm output that holds the alarm condition until reset by setting RES key (inside of the front panel) or by shorting between RES and COM terminal. Alarm reset is not possible until the output condition has been released. For details refer to 7. PARAMETER SETTING on page MONITOR OUTPUT The thrust waveform signal is output from BNC connectors (on the front panel) and terminal board (on the rear panel of VM-5G Single Unit Instrument Rack or VM-5Y Relay Module Unit) via a buffer amplifier RECORDER OUTPUT An analog signal proportional to the thrust value is output from the terminal block SELF-DIAGSTIC FUNCTION Any failures in the input system, such as sensor broken or imperfect connections are detected, then an input abnormal alarm is contact-output and (simultaneously), ALERT and DANGER alarm circuits are cut off POWER SEQUENCE If mounted in the VM-5G Single Unit Instrument Rack, the secondary power supply can be cut off by shorting between the P-S (POWER SEQUENCE) and COM terminals. Caution This function can be used for pulling out or pulling in the monitor unit at the emergency time. However, do not use for long time shorting of more than one (1) minute or turning on and off repeatedly. Also, the parallel connection for the two (2) or more monitors should not be allowed TIMED OK CHANNEL DEFEAT When OK alarm is output, DANGER alarm, ALERT alarm, display, and recorder output are disabled. For details refer to 7. PARAMETER SETTING on page

24 6. DESCRIPTION OF PARTS VM-5T 6-1 DESCRIPTION OF FRONT PANEL/SIDE VIEW No. Name No. Name 1 LCD display 8 Tag, Ser.No. plate 2 DANGER lamp 9 LCD board 3 ALERT lamp 10 Slide frame 4 OK lamp 11 Main board frame 5 BYPASS lamp 12 Main board 6 Monitor output connector 13 DIN connector (64pin) 7 Name plate

25 6. DESCRIPTION OF PARTS VM-5T 6-2 DESCRIPTION OF PARTS 1 LCD display This LCD display serves for display of thrust values, alarm set values, sensor set gap voltage value and other set values. 2 DANGER alarm lamp Lit when DANGER alarm is output. 3 ALERT alarm lamp Lit when ALERT alarm is output. 4 OK lamp Flashes (steady light in normal condition) when OK (input abnormal) alarm is output. 5 BYPASS lamp Flashes during DANGER bypass and lights during CHANNEL bypass. 6 Monitor output connector This is a BNC output connector for connection of an oscilloscope to observe the waveform, or for output to other devices such as an analyzer. The input signals from the transducers are output through a buffer amplifier. Mandatory Make sure to insulate the monitor output against earth. If not insulated, a 2-point earth system results, which may cause noise interference. 7 Name plate 8 Tag, Ser. No. plate The TAG. and SER.. are entered on this plate. 9 LCD board 10 Slide frame 11 Main board frame 12 Main board 13 DIN connector (64pin) Connector for connection to the VM-5G Single Unit Instrument Rack or VM-5H3 or VM-5W1 Instrument Rack. -18-

26 6. DESCRIPTION OF PARTS VM-5T 6-3 DESCRIPTION OF LCD DISPLAY. NAME. NAME 1 CH1 thrust value (digital) 8 CH2 thrust value (digital) 2 CH1 thrust value (bar graph) 9 CH2 thrust value (bar graph) 3 CH1 sensor set gap voltage value 10 CH2 sensor set gap voltage value 4 CH1 H-DANGER alarm set value 11 CH2 H-DANGER alarm set value 5 CH1 H-ALERT alarm set value 12 CH2 H-ALERT alarm set value 6 CH1 L-ALERT alarm set value 13 CH2 L-ALERT alarm set value 7 CH1 L-DANGER alarm set value 14 CH2 L-DANGER alarm set value MEAS1 MEAS2 % % MEAS1 MEAS % V % LCD display -19-

27 7. PARAMETER SETTING VM-5T 7-1 WITHDRAWAL OF FACE PLATE Pull out the face plate to gain access to the keys and DIP switches for setting the parameters located inside the unit. 1) Evenly loosen the knurled screw at the top and bottom of face plate. Prohibition Should screw manually. Do not use any tools. 2) Pull out the face plate. Prohibition Do not pull out beyond the depth of the slide frame. Make sure not to touch internal chassis. Prohibition Caution Failure to turn off the power before pulling the monitor unit out of the rack will result in serious damage and accidents. -20-

28 7. PARAMETER SETTING VM-5T 3) Open the face plate toward the right. Make sure not to touch internal printed circuit board. Prohibition 4) The keys and DIP switches for setting the parameters are located inside the unit. Specification set keys SET RES CHK DIP switches ON BY 2BY DBY MS1 MS2 N A -21-

29 7. PARAMETER SETTING VM-5T 7-2 BASIC KEY OPERATIONS SET (SET) key : Used to change the display mode of the LCD display and to finalize input. (UP) key : Used to change parameters and increment set values. (DOWN) key : Used to change parameters and decrement set values. RES (RESET) key : Used to reset alarms set to self-holding. Alarm reset is not possible until the output condition has been released. An alarm lamp set flashing by the First-out Display function cannot be reset. (Reset by shorting between the RES and COM terminals.) CHK (CHECK) key : The CHECK key is used to adjust the gain while changing set values with the UP and DOWN keys. For example, if the CHECK key is pressed while the value 0.1 appears on the MEAS 2 LED display, a value corresponding to the measurement range 0.1 can be set. Each operation of the CHECK key will multiply the multiplier by 10. : When the CHECK key is pressed during normal monitoring, the monitor will go through self-diagnosis in the following sequence : (1) LCD, LED display test (all lamps light) (2) Self-diagnosis (3) Display of diagnosis result (Normal) (Abnormal) The diagnosis result for CH1 is indicated on the MEAS 1 display and that for CH2 on the MEAS 2 display. If an abnormality is found as a result of self-diagnosis, the error content is displayed after approx. 3 seconds. In case of more than one abnormality, error contents are displayed at 3-second intervals. Error content display Items Display CH1 OK (input abnormal) alarm HIGH CH2 OK (input abnormal) alarm HIGH CH1 OK(input abnormal) alarm LOW CH2 OK(input abnormal) alarm LOW CH1 A/D input 5V side over CH2 A/D input 5V side over CH1 A/D input 0V side over CH2 A/D input 0V side over -22-

30 7. PARAMETER SETTING VM-5T 7-3 DIP SWITCH SETTING OFF ON ) 1BY(1CH BYPASS) S.W. 2) 2BY(2CH BYPASS) S.W. 3) DBY(DANGER BYPASS) S.W. 4) MS1(MODE-SELECT1) S.W. (normally OFF) 5) MS2(MODE-SELECT2) S.W. 6) N A(not available) DIP Switches 1) 1BY (CH1 BYPASS) Switch "ON" To select CH1 BYPASS function. "OFF" Normal monitoring 2) 2BY (CH2 BYPASS) Switch "ON" To select CH2 BYPASS function. "OFF" Normal monitoring 3) DBY (DANGER BYPASS) Switch "ON" To select DANGER BYPASS function. "OFF" Normal monitoring 4) MS1 (MODE-SELECT1) Switch (normally OFF) Set normally to OFF. Parameter setting mode is disabled. 5) MS2 (MODE-SELECT2) Switch ON For setting the alarm reset mode, alarm delay time, alarm relay mode, first-out display, and timed OK channel defeat. Also enables setting the address when used in combination with the VM-5H3 or 5W1 Instrument Rack and VM-5P1,2 Communication/Phase Marker Unit or VM-53 Dual communication Unit. To PARAMETER SETTING 1. OFF For changing the set values for DANGER alarm and ALERT alarm, and adjusting zero shift, thrust zero span, and recorder output zero span. To PARAMETER SETTING

31 7. PARAMETER SETTING VM-5T 7-4 PARAMETER SETTING PARAMETER SETTING 1 Setting the parameters for alarm reset mode, alarm delay time, alarm relay mode, first-out display, and timed OK channel defeat is enabled. Setting the address for use in combination with the VM-5H3 or VM-5W1 Instrument Rack and VM-5P1,2 Communication/Phase Marker Unit or VM-53 Dual Communication Unit is enabled MODE SELECT SWITCH SETTING OFF ON )1BY(CH1 BYPASS) S.W. 2)2BY(CH2 BYPASS) S.W. 3) DBY(DANGER BYPASS) S.W. 4) MS1(MODE-SELECT1) S.W. (normally OFF) 5) MS2(MODE-SELECT2) S.W. 6) N A(not available) DIP switches Confirm that the MS1 (MODE-SELECT1) switch is "OFF". Place the MS2 (MODE-SELECT2) switch in "ON" position. Setting other than the above are not enabled to set the parameters. -24-

32 7. PARAMETER SETTING VM-5T DISPLAY SCREEN HIERARCHY The flow chart shows the hierarchy of the PARAMETER SETTING 1 display. PARAMETER SETTING 1 2 CH1 DANGER alarm reset mode set CH2 DANGER alarm reset mode set CH1 ALERT alarm reset mode set CH2 ALERT alarm reset mode set CH1 OK alarm reset mode set CH2 OK alarm reset mode set CH1 DANGER alarm delay time set CH2 DANGER alarm delay time set CH1 ALERT alarm delay time set CH2 ALERT alarm delay time set CH1 OK alarm delay time set CH2 OK alarm delay time set 1-25-

33 7. PARAMETER SETTING VM-5T 1 CH1 DANGER alarm relay mode set CH2 DANGER alarm relay mode set CH1 ALERT alarm relay mode set CH2 ALERT alarm relay mode set CH1 OK alarm relay mode set CH2 OK alarm relay mode set Display only if used in combination with the VM-5Y3,4,5,6 Relay Module Unit. First-out display set Timed OK channel defeat set Address set 2-26-

34 7. PARAMETER SETTING VM-5T DISPLAY CONTENT The characters and numerals indicated on the LCD display when setting the parameters represent the following parameters and their status. MEAS 1... Displays the parameters that can be set. MEAS 1 Display Parameter CH1 DANGER alarm reset MEAS1 MEAS2 % % MEAS1 MEAS % V % CH2 DANGER alarm reset CH1 ALERT alarm reset CH2 ALERT alarm reset CH1 OK alarm reset CH2 OK alarm reset CH1 DANGER alarm delay time CH2 DANGER alarm delay time CH1 ALERT alarm delay time CH2 ALERT alarm delay time CH1 OK alarm delay time CH2 OK alarm delay time CH1 DANGER alarm relay mode LCD display CH2 DANGER alarm relay mode CH1 ALERT alarm relay mode CH2 ALERT alarm relay mode CH1 OK alarm relay mode CH2 OK alarm relay mode First-out display Timed OK channel defeat Address (communication address ID (1 to 10)) -27-

35 7. PARAMETER SETTING VM-5T MEAS 2... Displays the status of each parameter. Display Parameter status MEAS1 MEAS2 % % MEAS1 MEAS % V % MEAS 2 LATCH self-hold N LATCH auto-reset Alarm delay time None ENERGIZED ALARM (RMALLY DE-ENERGIZED) DE-ENERGIZED ALARM (RMALLY ENERGIZED) OFF ON Alarm delay time 1 sec. Alarm delay time 3 sec. Alarm delay time 6 sec LCD display -28-

36 7. PARAMETER SETTING VM-5T KEY OPERATIONS The chart below describes the key operations for PARAMETER SETTING 1. The display is reset to normal if there is no key operation for approx. 60 sec. LCD display Procedure Key operation MEAS 1 (Parameter) MEAS 2 (Parameter Status) Remarks 1 SET Press SET key more than 5 sec. Present status Specify CH1 DANGER alarm reset mode. 2 Press UP or Select latch or non-latch with UP or 3 SET Press SET key. Present status Specify CH2 DANGER alarm reset mode. 4 Press UP or Select latch or non-latch with UP or 5 SET Press SET key. Present status Specify CH1 ALERT alarm reset mode. 6 Press UP or Select latch or non-latch with UP or 7 SET Press SET key. Present status Specify CH2 ALERT alarm reset mode. 8 Press UP or Select latch or non-latch with UP or 9 SET Press SET key. Present status Specify CH1 OK (input abnormal) alarm reset mode. 10 Press UP or Select latch or non-latch with UP or 11 SET Press SET key. Present status Specify CH2 OK (input abnormal) alarm reset mode. 12 Press UP or Select latch or non-latch with UP or 13 SET Press SET key. Present status Specify CH1 DANGER alarm delay time. -29-

37 7. PARAMETER SETTING VM-5T LCD display Procedure Key operation MEAS 1 (Parameter) MEAS 2 (Parameter Status) Remarks 14 Press UP or Select N (none), 1 sec., 3 sec., or 6 sec. with UP or 15 SET Press SET key. Present status Specify CH2 DANGER alarm delay time. 16 Press UP or Select N (none), 1 sec., 3 sec., or 6 sec. with UP or 17 SET Press SET key. Present status Specify CH1 ALERT alarm delay time. 18 Press UP or Select N (none), 1 sec., 3 sec., or 6 sec. with UP or 19 SET Press SET key. Present status Specify CH2 ALERT alarm delay time. 20 Press UP or Select N (none), 1 sec., 3 sec., or 6 sec. with UP or 21 SET Press SET key. Present status Specify CH1 OK (input abnormal) alarm delay time. 22 Press UP or Select N (none) with UP or 23 SET Press SET key. Present status Specify CH2 OK (input abnormal) alarm delay time. 24 Press UP or Select N (none) with UP or 25 SET Press SET key. Present status Specify CH1 DANGER alarm relay mode. To set OK alarm delay time, select N (none). -30-

38 7. PARAMETER SETTING VM-5T LCD display Procedure Key operation MEAS 1 (Parameter) MEAS 2 (Parameter Status) Remarks 26 Press UP or Select ENERGIZED or DEENERGIZED with UP or 27 SET Press SET key. Present status Specify CH2 DANGER alarm relay mode. 28 Press UP or Select ENERGIZED or DEENERGIZED with UP or 29 SET Press SET key. Present status Specify CH1 ALERT alarm relay mode. 30 Press UP or Select ENERGIZED or DEENERGIZED with UP or 31 SET Press SET key. Present status Specify CH2 ALERT alarm relay mode. 32 Press UP or Select ENERGIZED or DEENERGIZED with UP or 33 SET Press SET key. Present status Specify CH1 OK (input abnormal) alarm relay mode. 34 Press UP or Select ENERGIZED or DEENERGIZED with UP or 35 SET Press SET key. Present status Specify CH2 OK (input abnormal) alarm relay mode. 36 Press UP or Select ENERGIZED or DEENERGIZED with UP or Procedures 35 and 36 are displayed only when using the monitor in combination with the VM-5Y3,4,5,6 Relay Module Unit. -31-

39 7. PARAMETER SETTING VM-5T LCD display Procedure Key operation MEAS 1 (Parameter) MEAS 2 (Parameter Status) Remarks 37 SET Press SET key. Present status Specify first-out display. 38 Press UP or Select ON (enable) or OFF (disable) with UP or DOWN key. 39 SET Press SET key. Present status Specify timed OK channel defeat. 40 Press UP or Select ON (enable) or OFF (disable) with UP or DOWN key. 41 SET Press SET key. Present status Specify address. 42 Press UP or Select address between 1 and 10 with UP or DOWN key. 43 SET Press SET key. Present status Return to procedure 1. Make sure to assign a unique address for use with the VM-5P1,2 Communication/ Mandatory Phase Marker Unit or VM-53 Dual Communication Unit and VM-5H3 or VM-5W1 Instrument Rack. Same addres number is not allowed in the same rack. The display is reset to normal approx. 60 sec. after setting is completed. -32-

40 7. PARAMETER SETTING VM-5T 7-5 PARAMETER SETTING PARAMETER SETTING 2 This chapter describes how to change the DANGER and ALERT alarm set values and adjust zero shift, thrust value zero span, and recorder output zero span. For adjustment of thrust value zero span and recorder output zero span refer to page 47 "MAINTENANCE" MODE SELECT SWITCH SETTING OFF ON ) 1BY(CH1 BYPASS) S.W. 2) 2BY(CH2 BYPASS) S.W. 3) DBY(DANGER BYPASS) S.W. 4) MS1(MODE-SELECT1) S.W. (normally OFF) 5) MS2(MODE-SELECT2) S.W. 6) N A(not available) DIP switches Confirm that the MS1 (MODE-SELECT1) switch is "OFF". Place the MS2 (MODE-SELECT2) switch in "OFF" position. Setting other than the above are not enabled to set the parameters. -33-

41 7. PARAMETER SETTING VM-5T DISPLAY HIERARCHY The flow chart shows the hierarchy of the PARAMETER SETTING 2 display. PARAMETER SETTING 2 4 CH1 H-DANGER alarm Set range : -10 to 110% of monitor range or ineffective CH2 H-DANGER alarm Set range : -10 to 110% of monitor range or ineffective CH1 H-ALERT alarm Set range : -10 to 110% of monitor range or ineffective CH2 H-ALERT alarm Set range : -10 to 110% of monitor range or ineffective CH1 L-ALERT alarm Set range : -10 to 110% of monitor range or ineffective CH2 L-ALERT alarm Set range : -10 to 110% of monitor range or ineffective CH1 L-DANGER alarm Set range : -10 to 110% of monitor range or ineffective CH2 L-DANGER alarm Set range : -10 to 110% of monitor range or ineffective CH1 zreo shift adjustment Adjustment range : -50 to 0 to +50% of monitor range (0 to 100%) CH2 zreo shift adjustment Adjustment range : -50 to 0 to +50% of monitor range (0 to 100%) 3 Refer to Maintenance for more detail. It is not display for the 4 point alarm output type. -34-

42 7. PARAMETER SETTING VM-5T 3 CH1 thrust zero adjustment Adjustment range : ±5% of monitor range CH2 thrust zero adjustment Adjustment range : ±5% of monitor range CH1 thrust span adjustment Adjustment range : ±5% of monitor range CH2 thrust span adjustment Adjustment range : ±5% of monitor range CH1 recorder output zero adjustment Adjustment range : ±5% of monitor range CH2 recorder output zero adjustment Adjustment range : ±5% of monitor range CH1 recorder output span adjustment Adjustment range : ±5% of monitor range CH2 recorder output span adjustment Adjustment range : ±5% of monitor range 5-35-

43 7. PARAMETER SETTING VM-5T DISPLAY CONTENT The characters and numerals indicated on the LCD display when setting the parameters represent the following parameters and their status. MEAS 1 Displays the parameters that can be set. MEAS 1 Display Parameter CH1 H-DANGER alarm set MEAS1 MEAS2 % % MEAS1 MEAS % V % CH2 H-DANGER alarm set CH1 H-ALERT alarm set CH2 H-ALERT alarm set CH1 L-ALERT alarm set CH2 L-ALERT alarm set CH1 L-DANGER alarm set CH2 L-DANGER alarm set CH1 zero shift adjustment (monitor range:-50 to 0 to +50%system) CH2 zero shift adjustment (monitor range:-50 to 0 to +50%system) CH1 zero shift adjustment (monitor range:0 to 100% system) CH2 zero shift adjustment (monitor range:0 to 100% system) CH1 zero shift adjustment (monitor range:0 to 100% system) 0 0 LCD display CH2 zero shift adjustment (monitor range:0 to 100% system) CH1 thrust zero adjustment CH2 thrust zero adjustment CH1 thrust span adjustment CH2 thrust span adjustment CH1 recorder output zero adjustment CH2 recorder output zero adjustment CH1 recorder output span adjustment CH2 recorder output span adjustment -36-

44 7. PARAMETER SETTING VM-5T MEAS 2... Displays the status of each parameter. Display Parameter status MEAS 2 Disable MEAS1 Error MEAS2 % % MEAS1 MEAS % V % LCD display The limit value specified for H-DANGER alarm must be higher than that for H-ALERT alarm. The limit value specified for L-DANGER alarm must be lower than that for L-ALERT alarm. The limit value specified for H-ALERT alarm must be higher than that for L-ALERT alarm. -37-