Summary 1 CONNECTIONS... 3 1.1 TEMPERATURE PROBES...3 1.2 LOW VOLTAGE DIGITAL INPUTS...3 1.3 LIVE DIGITAL INPUTS...4 1.4 RELAY OUTPUTS...5 2 POWER SUPPLY... 6 3 SERIAL CONNECTIONS... 6 4 SOFTWARE... 7 4.1 USER INTERFACE DESCRIPTION...7 4.2 UNIT STARTUP...7 4.3 UNIT SHUTDOWN...7 4.4 ENABLING A COMPRESSOR...7 4.5 DISABLING A COMPRESSOR...8 4.6 MEANING OF COMPRESSOR/CIRCUIT STATUS LED'S...8 4.7 TEMPERATURE DISPLAY...8 4.8 ALARMS...9 4.8.1 Circuit and/or compressor alarms...9 4.8.2 General alarms...9 5 ALARM SIGNALS...10 6 REGULATION...12 6.1 CHILLED WATER REGULATION:...12 6.1.1 Default set point settings...13 7 ENABLE PRINTING...14 7.1 PARAMETER PRINTING...14 7.2 ALARM HISTORY PRINTING...15 7.3 LAMP TEST...16 7.4 PRINTER CHARACTERISTICS...16 8 SETUP...18 8.1 ACCESS TO THE PROGRAMMING MENU...18 9 PARAMETER LIST...19 10 ENCLOSURES...22 1
Board description front side rear side 2
1 Connections 1.1 Temperature probes Terminals Meaning 22, 23 Evaporator inlet temperature PTC probe 24, 25 Evaporator outlet temperature PTC probe 1.2 Low voltage digital inputs The inputs described below (BT) are low voltage inputs and must consist of voltage-free contacts. Terminals Meaning 26 Common to all low voltage inputs 27 BT0 input: Circuit 1 high pressure switch 28 BT1 input: Circuit 2 high pressure switch 29 BT2 input: Circuit 1 low pressure switch 30 BT3 input: Circuit 2 low pressure switch 31 BT4 input: Compressor 1 oil differential pressure switch 32 BT5 input: Compressor 2 oil differential pressure switch 33 BT6 input: Circuit 1 fan thermal overload protection 34 BT7 input: Circuit 2 fan thermal overload protection 3
1.3 Live digital inputs Terminals Meaning 38 Common to 110-230 Vac (N) inputs 39 AT0 input: unit remote ON/OFF 40 AT1 input: Flow switch consent 41 AT2 input: Circuit 1 high pressure maximum safety pressure switch 42 AT3 input: Circuit 2 high pressure maximum safety pressure switch 43 AT4 input: Compressor 1 thermal overload protection 44 AT5 input: Compressor 2 thermal overload protection Using the REMOTE ON/OFF control: For proper use of the unit s remote ON/OFF control, the following delay time must be set between the unit s ON/OFF control and the water pump ON/OFF control: Pump control Remote ON/OFF OFF ON OFF MIN. 60 MIN. 60 This is very important, because during the pump-down procedure (at compressor stop) the pump must be on in order to carry it out correctly. Otherwise, if the flow switch intervenes, this could cause damage to the compressors. In this case Climaveneta will not cover warranty. Moreover, if the remote ON/OFF control is used (from an external contact or through protocol control) the following minimum time delays must be observed: ON/OFF control ON OFF A flow switch at the evaporator s outlet is mandatory to avoid the invalidation of the warranty. Electrical panel connection of the remote ON/OFF contact: Remote ON/OFF contact MINIMUM 360 E MINIMUM 60 F 4
1.4 Relay output RELAY terminals NC NA C RL1: 1 st winding of compressor 1 10 9 RL2: 2 nd winding of compressor 1 or 2 nd additional capacity step RL3: 1 st winding of compressor 2 13 12 RL4: 2 nd winding of compressor 2 or 2 nd additional capacity step RL5: 1 st capacity step compressor 1 5 4 RL6: 1 st capacity step compressor 2 6 RL7: circuit 1 liquid line solenoid valve 7 RL8: circuit 2 liquid line solenoid valve 8 RL9: antifreeze heaters 17 16 15 RL10: unit general fault 3 2 1 11 14 5
2 Power supply 18-19 board power supply 12 Vac. 12 VA 20-21 isolated power supply 12 Vac. 2,4VA. 3 Serial connections COM1 RS485 half duplex serial interface for connection to printer or supervision systems 35 RS485 -.. 100 36 RS485 +..99 CLIMAVENETA RS 232/485 37 reference for RS485 COM1 98 CONVERTER FOR PRINTER 6
4 Software 4.1 User interface description The keyboard of the CVM-20 is shown in the enclosures, Fig.1. If the POWER LED is on, it means that the electronic control is supplied with power. Before you switch on the unit, make sure that it has been supplied with power for at least 8 hours (in order to enable the heating of the oil and to avoid presence of refrigerant gas inside the compressor oil pan). 4.2 Unit start-up Press the ON/OFF key The LED of the key will light up. 4.3 Unit shutdown Press the ON/OFF key The LED of the key will go off. 4.4 Enabling a compressor Press the C1 or C2 key corresponding to the compressor to be enabled; The LED of the key will light up. The starting of the enabled compressor may be delayed due to: the delays set in the parameters the water inlet temperature is under the cold water set point alarm 7
4.5 Disabling a compressor Press the C1 or C2 key corresponding to the compressor to be disabled; The LED of the key will go off. Use this function only for emergency stops, since the pump-down procedure is not carried out and the compressor may suffer damage not covered by the warranty. For the correct compressor s on/off procedure use the ON/OFF key. 4.6 Meaning of compressor/circuit status LED s SEL LED ON LED Off Off Compressor disabled On Off Compressor enabled but delayed On On Compressor operating Flashing Off Compressor alarm 4.7 Temperature display Evaporator inlet temperature: press the TEMP key - The IN LED of the key will light up read the value on the display. Evaporator outlet temperature: press the TEMP key - The OUT LED of the key will light up read the value on the display. 8
4.8 ALARMS There are two types of alarm: the circuit/compressor alarms and the general alarms. 4.8.1 Circuit and/or compressor alarms Circuit and compressor alarm visualisation The circuit and/or compressor alarms are signalled by the flashing of the SEL LED corresponding to the compressor/circuit involved; the ALARM LED comes on at the same time. To visualise the code you must: Press the ALARM LIST key. The alarm code will appear on the display. Use the arrow up and arrow down keys in order to verify if more alarms are present at same time. Alarm reset: Press the C1 or C2 key corresponding to the compressor/circuit for which the alarm has been activated; if the event that caused the alarm has been removed (SEL LED flashing), the alarm will be reset. 4.8.2 General alarms General alarms are signalled by the lighting up of the ALARM LED. To find out the general alarm codes proceed as follows: Press the ALARM LIST key The alarm code will appear on the display. Use the arrow up and arrow down keys in order to verify if more alarms are present at same time. Alarm reset: Press the ON/OFF key; if the event that caused the alarm has been removed (alarm code on the display flashing) the alarm will be reset. 9
5 Alarm signals CODE ALARM Type of reset Cause E000 Antifreeze alarm M Low evaporator flow rate Water pump off Incorrect setting of set point and of t Incorrect setting of antifreeze set point E020 Incorrect configuration A Error in the programming of the configuration parameters E101 Compressor 1 oil differential pressure switch M Compressor low oil pressure E103 Compressor 1 thermal overload protection M Compressor motor overheating E151 Compressor 2 oil differential pressure switch M Compressor low oil pressure E153 Compressor 2 thermal overload protection M Compressor motor overheating E201 Circuit 1 high pressure M High condensing pressure E203 Pump down pressure alarm at comp. start A The circuit has not reached the pump-down pressure set E204 Pump down pressure alarm at comp. stop Appears only in the alarm list The circuit has not reached the pump-down pressure set E206 Circuit 1 low pressure A/M Inadequate water flow rate to evaporator Dirty evaporator Insufficient freon charge E251 Circuit 2 high pressure M High condensing pressure 10
E253 Pump down pressure at circuit 2 start-up E254 Pump down pressure at circuit 2 shutdown A A If the alarm is triggered at shutdown, it is simply recorded in the alarm history Appears only in alarm history printout E256 Circuit 2 low pressure A/M Inadequate water flow rate to the evaporator Dirty evaporator Insufficient freon charge E400 Inlet water temperature probe error A Temperature probe malfunction E401 Outlet water temperature probe error A Temperature probe malfunction E601 Circuit 1 safety high pressure switch M Maximum safety pressure switch trip E651 Circuit 2 safety high pressure switch M Maximum safety pressure switch trip E700 Chilled water circuit flow switch A Not correct water flow rate Air bubbles in water circuit Flow switch malfunction E901 Circuit 1 fan thermal protection M Fan motor overheating E951 Circuit 2 fan thermal protection M Fan motor overheating M A A/M = manual reset alarm = automatic reset alarm = automatic reset alarm for a programmable number of events/hour 11
6 Regulation 6.1 Chilled water regulation: % load Example of 4-step regulator 100% 75% 50% 25% 0% Set point ( t/4) Set point + t Inlet temperature press the SET key The status LED will light up the set point value will appear on the display modify the set point using the following keys: arrow up to raise arrow down to lower press the SET key to confirm. The LED in the key will go off to modify the value of the t, refer to the programming access procedure and modify the value of parameter no. 1. 12
6.1.1 Default set point settings The following table shows, based on the number of steps, the commonly used set point and proportional band values. The theoretical minimum and maximum values indicated in the table for the outlet temperature refer to nominal flow rate operation, and therefore with a 5 C evaporator t. No. of steps Set point [ C] D t [ C] Theor. min. out temp. Theor. max. out temp. 1 11 1 6 12 2 9.5 2.5 5.7 10.8 3 8 4 5.6 9.4 4 7 5 5.7 8.3 Warning: the regulation is made based on the temperature reading at the evaporator s inlet temperature probe. 13
7 Enable printing The data are accessible through the RS485 serial port on the base board, to which a serial printer can be connected for delivering the contents of the files (DPU printer 114, paragraph 1.4). During the printout, the enable printing key flashes. If the print command is repeated while printing is in progress, the operation will be interrupted. 7.1 Parameter printing The printing of the parameters is obtained, in the parameter mode (comp. disabled), by pressing the ALARM LIST and SET keys simultaneously. Each line of print has the following structure: 1: Number of the parameter 2: Value of the parameter 14
7.2 Alarm history printing The printing of the alarm history is obtained, with alarm list LED on, by pressing the SET key (compressors disabled). The print record, in columns, has the following structure: DESCRIPTION 1 Progressive printout number 2 Number of hours between alarm and current hour LIMITS 001-200 00-24 3 Alarm code 000-299 4 Number of events in the hour indicated 1-32 Example: CURRENT HOUR : 0025 N TIME TYPE AL/0 0001 13 07/10/97 01 0002 13 07/10/97 04 0003 13 07/10/97 02 0004 13 07/10/97 03 0005 13 07/10/97 01 0006 13 07/10/97 01 0007 13 07/10/97 01 0008 13 07/10/97 01 0009 13 07/10/97 01 0010 13 07/10/97 01 0011 13 07/10/97 01 0012 13 07/10/97 01 END CURRENT HOUR : 0000 N TIME TYPE AL/0 END N VALUE 0001 0095 0002 0025 0003 0005 0004 0030 0005 0040 10 0001 15
7.3 Lamp test Upon start-up and each time the ON/OFF key is pressed, all the LED s and displays on the front panel light up to verify the correct operation of the keyboard displays. 7.4 Printer characteristics To check the set-up of the DPU-414 printer: press the printer s ON LINE (for at least 2 SECONDS) and POWER ON keys simultaneously. The configuration of the dip-switch software will be printed. Press the FEED key to exit from the programming. The set-up is correct if the printout corresponds to the following list: Dip SW-1 1 (OFF): Input=Serial 2 (ON): Printing Speed=High 3 (OFF): Auto Loading=OFF 4 (OFF): Auto LF=OFF 5 (ON): Setting Command=Enable 6 (OFF): Printing 7 (ON): Density 8 (ON): =100 % Dip SW-2 1 (OFF): Printing Columns=80 2 (ON): User Font Back-up=ON 3 (ON): Character Select=Normal 4 (ON): Zero=Normal 5 (ON): International 6 (ON): Character 7 (OFF): Set 8 (OFF): =England 16
Dip SW-3 1 (ON): Data Length=8bits 2 (ON): Parity Setting=NO 3 (OFF): Parity Condition=Even 4 (OFF): Busy Control=XON/XOFF 5 (OFF): Baud 6 (ON): Rate 7 (ON): Select 8 (ON): =9600 bps If the configuration of the dip-switches differs from the above, consult the printer user s manual or contact CLIMAVENETA. 17
8 Setup 8.1 Access to the programming menu To access the USER parameters: 1. Disable the compressors (see chapter 5.5). 2. Press the MENU key. P000 will appear on the display. 3. Scroll through the parameter list using the arrow up or arrow down keys. 4. To visualise the value of the indicated parameter press the TEMP key, and to modify its value press the arrow up and arrow down keys. To return to the parameter list, press the TEMP key again. 5. To exit from parameter programming press Menu key. 6. Enable the compressors (see chapter 5.4). To access the FACTORY menu: 1. Disable the compressors (see chapter 5.5). 2. Press the MENU key. P000 will appear on the display. 3. Scroll through the list using the arrow up or arrow down keys until PASS appears on the display. 4. To visualise the value of the indicated parameter press the TEMP key, and using the arrow up or arrow down keys set the password. To return to the parameter list, press the TEMP key again. 5. To exit from parameter programming press the MENU key. 7. Enable the compressors (see chapter 5.4). NB: to enable the CVM20 to recognise the modified parameters turn off the supply (using the main switch) power and, after a few seconds, turn it back on. Only authorised Climaveneta technicians are allowed access to factory parameters. Setting incorrect parameters can provoke serious damage and improper operation of the unit. 18
9 Parameter list = USER PARAMETERS M = MACHINE PARAMETERS CI = CIRCUIT PARAMETERS CO = COMPRESSOR PARAMETERS N. TYPE MACHINE PARAMETERS RANGE DEFAUL T 0 M COLD SET POINT p.30 p.31 ----------- C 1 M t p.32 p.33 ------------- C 2 M STEP HYSTERESIS 0.1 10.0 0.5 C 3 M ANTIFREEZE SET p.34 p.35 3.0 C 4 M ANTIFREEZE SET DIFFERENTIAL 0.1 10.0 4.0 C 5 M COMPRESSOR SATURATION 0 1 1 flag 6 M MINIMUM SWITCHING-ON DELAY BETWEEN STEPS 7 M MINIMUM SWITCHING-OFF DELAY BETWEEN STEPS 0 500 10 sec 0 500 0 sec 8 M FLOW SWITCH ALARM DELAY 0 500 1 sec 9 CI MAXIMUM TIME IN PUMP-DOWN MODE 0 500 30 sec 10 M FLOW SWITCH ALARM RESET DELAY 0 500 10 sec 11 M OIL DIFF. PRESSURE SWITCH ALARM DELAY 0 500 Tab. 9-1 TYPE OF COMPRESSOR SET PARAMETER 11 COPELAND UP TO 60 Hp 0.7 120 COPELAND OVER 60 Hp 1.2 45 REFCOMP SERIES F AND M 1.8 60 Table 9-1 COMPRESSOR OIL DIFFERENTIAL PRESSURE SWITCH CALIBRATION 12 M LOW PRESSURE ALARM DELAY 0 500 120 sec 13 M ADDITIONAL LOW PRESSURE ALARM DELAY 0 500 0 sec 19
R22 R407C (Bar) R134A (Bar) SET DIFF. SET DIFF. 2.8 1.4 1.0 0.7 WATER COOLED UNITS 1.6 0.9 0.6 0.7 AIR COOLED UNITS 1.6 0.9 0.6 0.7 FOR LOW OUTLET WATER TEMPERATURE ( > - 5 C) AND FOR EXTERNAL AIR LOW TEMPERATURE DEVICE 1.0 0.7 FOR LOW WATER TEMPERATURE (<= A -5 C) Table 9-2 LOW PRESSURE SWITCH CALIBRATION SAFETY VALVE SET MAXIMUM SAFETY HIGH PRESSURE SWITCH TRIGGERING RESET 23.3 21.8 16.3 24.5 23 17.5 27 25.5 19.5 27.6 26.1 20.1 28 26,5 20.5 Table 9-3 HIGH PRESSURE ALARM SET 14 M ALARMS READING DELAY 0 500 0 sec 15 M ALARM RESET DELAY 0 500 0 sec 16 M SAFETY TIME BETWEEN OFF/ON OF A COMPRESSOR 17 M SAFETY TIME BETWEEN STARTUP AND STARTUP OF A COMPRESSOR 0 500 60 sec 0 600 360 sec 18 M TYPE OF REGULATION 0= PROP. 1=INT./ASS. 0 flag 19 M INTEGRAL TIME 0 3600 80 sec 20 M MAXIMUM CORRECTION INTRODUCED BY THE 0.1 10.0 5.0 C INTEGRAL 21 M PROBE FOR INTEGRAL REGULATION 0=INLET 0 flag 1=OUTLET 22 M INTEGRAL PRESET -50.0 100.0 0 C 23 M PRESENCE OF PART-WINDING RELAY 0 1 1 flag 24 CI PUMP-DOWN CONFIGURATION CIRCUIT 1 0 2 Tab. 9-4 25 CI PUMP-DOWN CONFIGURATION CIRCUIT 2 0 2 Tab. 9-4 PARAMETER MEANING VALUE 0 NO PUMP-DOWN 1 PUMP-DOWN ONLY AT SHUTDOWN 2 PUMP-DOWN AT SHUTDOWN AND STARTUP Table 9-4 CIRCUITS PUMP-DOWN CONFIGURATION 26 M ENABLES COMPRESSOR SHUTDOWN FROM CONTROL INLET 0 1 0 flag 27 CI CIRCUITS CONFIGURATION 0 6 Tab. 9-5 PAR. VALUE N. OF CIRCUITS N. OF COMPRESSORS PARTIAL N. N. OF STEPS NOTES 20
1 1 1 0 1 2 1 1 1 2 3 1 1 2 3 4 2 2 0 2 5 2 2 1 4 6 2 2 2 6 NO PART-WINDING Table 9-5 COOLING CIRCUIT CONFIGURATION 28 M WATER INLET TEMPERATURE PROBE OFFSET -10.0 10.0 0 C 29 M WATER OUTLET TEMPERATURE PROBE -10.0 10.0 0 C OFFSET 30 M SET POINT LOWER LIMIT -50.0 100.0 5.0 C 31 M SET POINT HIGHER LIMIT -50.0 100.0 12.0 C 32 M t LOWER LIMIT 1.0 50.0 1.0 C 33 M t HIGHER LIMIT 1.0 50.0 5.0 C 34 M ANTIFREEZE SET LOWER LIMIT -50.0 20.0 3.0 C 35 M ANTIFREEZE SET HIGHER LIMIT -50.0 20.0 10.0 C 36 M MEMBER: DEVICE IDENTIFICATION 0 14 0 num 37 M FAMILY: DEVICE IDENTIFICATION 0 14 0 num 38 M SERIAL PORT OPERATING MODE 0=PRINT 0 flag 1= RS485 39 M PRESENCE OF MASTER 0 1 0 flag 40 M ALARM LIST ERASING 0 1 0 flag 41 CO COMPRESSOR 1 OPERATING HOURS 0 60000 num 42 CO COMPRESSOR 2 OPERATING HOURS 0 60000 NUM 43 CI NUMBER OF MINIMUM PRESSURE ALARMS PER HOUR FOR ACTIVATION OF MANUAL RESET 0 100 3 num 44 M UNIT S ACTUAL OPERATING HOURS 0 2047 Hrs 45 -------- ------------------------------------------------------------ ------------------ ---------- 46 -------- ------------------------------------------------------------ ------------------ ---------- 47 -------- ------------------------------------------------------------ ------------------ ---------- 48 -------- ------------------------------------------------------------ ------------------ ---------- 21
10 Enclosures Figure 1 22