Refrigerated air dryers

Transcription

1 Refrigerated air dryers OPERATING AND MAINTENANCE MANUAL Original instructions

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3 OPERATING AND MAINTENANCE MANUAL - Contents 1 CONTENTS CONTENTS... 1 Chapter 1 IDRY ELECTRONIC CONTROLLER User Interface Display Buttons Icons Main functions Unit start-up Unit shutdown Condensate drain test Dual set point management Displaying the set point Modifying the set point Digital input Compressor Compressor operating hours alarm Condensate drain TIMED condensate drain FIXED condensate drain Programming Editing parameters PR Editing Service menu parameters PR Keypad lock/unlock function Description of settings and parameters Alarms Alarm display High and low temperature alarm memorization Programming key Programming the key Programming the device with the key TTL serial line for monitoring systems REP output-optional... 10

4 2 OPERATING AND MAINTENANCE MANUAL CHAPTER 1 IDRY ELECTRONIC CONTROLLER 1.1 User Interface Display The controller displays the unit status with messages shown on the LCD display. The display messages can be: Unit OFF Unit running (normal operation) High Dew Point temperature Buttons BUTTONS FUNCTION Displays or edits the set-point. During programming, selects a parameter or confirms a value. Displays data of a temperature alarm. During programming, scrolls through parameter codes or increments the relative value. Displays data of a temperature alarm. During programming, scrolls through parameter codes or decreases the relative value. Turns the unit on or off. Condensate drain test. Locks or unlocks the keypad. Enters programming mode. Exits programming mode.

5 1.1.3 Icons OPERATING AND MAINTENANCE MANUAL 3 ICON ICON STATUS FUNCTION 1.2 Main functions Unit start-up After making the electrical connections, the display shows to indicates that the board is powered, after which is displayed (see paragraph Display ) to indicate that the unit and refrigerant compressor are off. To turn on the unit, press. The unit starts to operate automatically according to the temperature read by probe BDPT and according to the temperature control logic. Even if the temperature read by the probe reaches the value requiring start-up of the compressor, start-up still depends on the set delay interval as entered on the electronic controller (see paragraph 1.6 Description of settings and parameters ). On start-up, the display shows the message (see paragraph Display ) to indicate a high dew point temperature, and when the unit reaches operating conditions the text is displayed. The icon indicates compressor operation. In the event of sudden power failure when the unit is running, the unit will resume operation automatically when the power is restored according to the procedure described above. The electronic controller can be programmed with the unit ON or OFF. Off On Flashing Off On On Off Off Flashing On Flashing On Flashing Compressor OFF Compressor ON Compressor stopped at timed intervals. Condensate drain deactivated Condensate drain activated Winter set point in use Winter set point function disabled No alarm condition Indicates an alarm condition Unit of measurement in degrees Centigrade Unit in programming Unit of measurement in degrees Fahrenheit Unit in programming Unit shutdown With the unit ON, press for the unit to set to stand-by, indicated by the message OFF Condensate drain test Press to activate the condensate drain relay (if the condensate drain is set in timed mode). The relay is deactivated when the button is released Dual set point management The controller has a dual set point: summer winter To select the set point to use, set the parameter (For more information, see paragraph 1.6 Description of settings and parameters ). To enable switching from digital input, set the parameter to (see paragraph Dual set point from digital input ) Displaying the set point If parameter = : Briefly press : to display the set point immediately; To return to the current temperature, wait for 15s or press the button again.

6 4 OPERATING AND MAINTENANCE MANUAL Modifying the set point If parameter = : Press the button for at least 2 seconds. The set point is displayed and the LED starts flashing. Use button and to modify the value. To memorize the new set point, press or wait for 15s to exit programming mode Digital input A digital input is present with different configurations settable via parameter. The image below shows the electronic controller wiring diagram. Terminals 9 and 11 indicate the digital input. The maximum control range is 20m with a Belden type shielded cable. If control from more than 20 metres is required, a support relay must be installed. Digital input not used Thermostat probe 8(3)A250V 20(8)A250V Line N.C. Comp Power supply 230V~ Hot Key External alarm function (=) After the timeout set in parameter has elapsed after activation of the input, an alarm is generated, the message is displayed and the output status remains unchanged. The alarm is reset automatically when the digital input is deactivated External shutdown alarm function (=) After the timeout set in parameter has elapsed, after activation of the input, a shutdown alarm is generated, the message is displayed and the compressor output is deactivated. The alarm is reset automatically when the digital input is deactivated Pressure switch trip function (=) If the number of pressure switch trips as set in parameter is reached within the time interval set in parameter the alarm is activated. The message is displayed, the compressor is shut down and control is suspended. To resume normal operation, the device must be switched off and on again. When the input is active, the compressor remains switched off Remote On / off from digital input (=) If the parameter is set as the input is configured for remote on/off control of the device (see ). Contact Function Open ON Closed OFF Open OFF Closed ON Only if is different from Dual set point from digital input If the parameter is set to none of the above functions can be selected for the digital input. The input serves to set which of the two set points is to be used for temperature control (see ). Contact Function Open Winter Closed Summer Open Summer Closed Winter

7 OPERATING AND MAINTENANCE MANUAL Digital input polarity The polarity of the digital input depends on the parameter : =: active on contact closed; =: active on contact open. 1.3 Compressor The compressor relay is activated to maintain a set temperature as established by the set point. Hysteresis is added automatically to the set point. If the temperature increases and reaches the set point plus hysteresis value, the compressor is activated, to then be shut down when the temperature returns to the set point value.. Temperature SET + HY SET Time Compressor ON In the event of a probe fault, activation and deactivation of the compressor output are managed according to time intervals set via the parameters and. These parameters are set by default at 0. When one of these values is modified the support variable is set to Compressor operating hours alarm The controller memorizes the compressor operating hours. It is also possible to set a threshold value for the operating hours in the relative parameter. When the operating hours exceed the set threshold, an alarm message is displayed to notify the user of the need for prompt routine maintenance intervention (alarm ). The alarm message does not shut down the unit. On completion of routine maintenance, the operator must reset the compressor operating hour counter timers. To reset the compressor operating hours alarm, press ; the device displays the message, and after 2 seconds the text starts flashing. This resets the alarm. 1.4 Condensate drain There are two modes for managing the condensate drain, selectable via parameter : = : timed; = : fixed TIMED condensate drain In the timed condensate drain mode, the relay is energized cyclically: with the compressor off, each interval for a period equal to, or for a period equal to with the compressor on. Solenoid valve status Solenoid valve ON Solenoid valve OFF When the unit is started by means of the main power switch, the condensate drain solenoid valve is energized and thereafter the relay will be energized cyclically.

8 6 OPERATING AND MAINTENANCE MANUAL FIXED condensate drain If the unit is equipped with capacitive condensate drain ID, parameter must be set to (fixed). In fixed condensate drain mode, the relay is constantly energized. Parameter enables selection of whether the condensate drain will be started also when the unit is OFF or only with the unit ON. 1.5 Programming Editing parameters PR1 To edit a parameter value: A B Press and hold buttons + to access programming mode ( flashes). Select the required parameter. C Press the button to display the value. D Modify the value by means of button or. E Press to save the new value and go to the next parameter. To quit the programming procedure display a parameter and then press +. You can also quit the procedure by waiting for 15 seconds without pressing any buttons. The new value set is saved to the memory also when you quit programming mode without pressing button Editing Service menu parameters PR2 The SERVICE menu includes all the parameters of the device Entering the Service menu A To enter the service menu, enter programming mode by pressing buttons + for 3s ( flashes). When the first parameter is displayed, continue to hold down the two buttons +. for at least 7 seconds. Access to the service menu is confirmed by message followed immediately by parameter. B Select the required parameter by means of button or. C Press the button to display the value. D Modify the value by means of or. E Press to save the new value and go to the next parameter. To quit the programming procedure, display a parameter and then press +. You can also quit the procedure by waiting for 15 seconds without pressing any buttons. The new value set is saved to the memory also when you quit programming mode without pressing button Changing the level of a parameter Each PR2 SERVICE parameter can be removed from or entered in the PR1 USER level by pressing buttons +. To identify whether the parameter belongs to one level or the other, access SERVICE programming. If the parameter is on the USER level the decimal point will be displayed Keypad lock/unlock function Press and hold buttons and for a few seconds until the message flashes on display. The keypad is now locked: only display of the set point, maximum and minimum temperatures is possible. If a button is pressed for more than 3s, the text.is displayed. Press and hold buttons and for a few seconds until the message flashes on display. The keypad is now unlocked.

9 1.6 Description of settings and parameters OPERATING AND MAINTENANCE MANUAL 7 Parameter Level Description Range Setting Summer set point Winter set point Selection of set point type: (,, ): selects whether the unit operates with the summer set-point (=), winter set-point (=) or whether the selection is to be made by the digital input (=). Set-point trip differential. The hysteresis value is added to the set-point: the relay is energised when the temperature reaches the set-point + hysteresis value and de-energised when the temperature returns to the set-point value. Establishes the minimum set-point value. Establishes the maximum set-point value. Serves to calibrate the thermostat probe Compressor output activation delay from start-up Compressor activation is inhibited for the preset time interval from the time of unit start-up Anti-hunting delay; identifies the minimum time interval between compressor shutdown and subsequent restart Compressor running with faulty probe; time for which the compressor remains active in the presence of a probe fault. With =0 the compressor always remains stopped Note: If =0 and =0 the compressor remains stopped Compressor off with faulty probe; time for which the compressor remains stopped in the event of a probe fault. With =0 the compressor is always on Variable set to 1 by the program when or are set to values other than 0 Temperature unit of measurement: C = Celsius; F = Fahrenheit. LS US LS US 5.5 C 42 F 2.5 C 37 F E, I, d I SEE/SEI SEE/SEI C 7 F 1.5 C 35 F 5.5 C 42 F 0.0 C 0 F sec min min min CAUTION When changing the unit of measurement, the set-point and control parameters:,,,,,, must be reset appropriately. C F F Enables the decimal point to be displayed =integers =decimals RESERVED PARAMETER (DO NOT CHANGE) - bad RESERVED PARAMETER (DO NOT CHANGE) - A Condensate drain type: =timed; =fixed Condensate drain activation = always active; = active only with unit ON. In de tp FI S O de tp (if timed condensate drain) FI (if capacitive condensate drain) Condensate drain ON time, sets the condensate drain valve opening time sec 2 Condensate drain ON time with compressor running, sets the condensate drain valve opening time with compressor running sec 4 Condensate drain OFF time, sets the condensate drain valve closing time sec 120 Temperature alarm configuration = absolute temperatures; = related to SET POINTS; Ab re S Ab

10 8 OPERATING AND MAINTENANCE MANUAL Parameter Level Description Range Setting 1.7 Alarms Alarm display High temperature alarm: when this temperature is reached the alarm is signalled. The alarm can be delayed by parameter. Low temperature alarm, when this temperature is reached the alarm is signalled. The alarm can be delayed by parameter. Alarm reset differential Temperature alarm delay; time interval between detection and display of a temperature alarm. Temperature alarm inhibition from start; the temperature alarm is inhibited from unit start-up for the time interval set in this parameter. Compressor operating hours: calculates the compressor operating hours. Read-only parameter. Each unit is equivalent to 10 hours. Compressor maintenance alarm; compressor maintenance alarm set-point. Each unit is equivalent to 10 hours. when set to 0 inhibits alarm Digital input polarity: = the digital input is activated when the contact is opened = the digital input is activated when the contact is closed Digital input configuration: =external alarm; = external block alarm; = pressure switch; = remote On/Off = disabled; Alarm delay from digital input : = or : alarm signal delay from digital input : delay between detection and signalling of an external alarm = time for pressure switch function: if starts in time interval are reached, restarting is manual only and is performed by switching the unit off and then on ALL 150 C -55 C ALU When, flashes, the unit is in alarm status. Together with LED 3 the display shows an alarm code, which can be: 20 C 68 F C -40 F 1.0 C 2 F sec min op CL EAL, bal, PAL, OFn, Htr CL EAL sec 5 Number of starts for pressure switch function: At each activation of the digital input the control is blocked; if activations are reached in time restarting is manual only by powering off the unit and then powering it on again. Probe type selection PtC ntc ntc On/Off button function no off off Button function no ofs no Probe display - - Software release (read-only) - - Parameters table (read-only) serves to identify the factory set parameters map - - Code Meaning Cause Output Thermostat probe faulty Probe -BDPT faulty or resistive value out of range. Compressor output according to parameters and High temperature alarm Dew Point Temperature above alarm set point Not modified Low temperature alarm Dew Point Temperature below alarm set point Compressor output OFF External alarm Not modified External alarm (=) Compressor output OFF External alarm (=) Compressor output OFF

11 OPERATING AND MAINTENANCE MANUAL 9 Code Meaning Cause Output Compressor maintenance alarm When the number of compressor operating hours exceeds the maintenance threshold value of parameter the maintenance request signal is activated Not modified CAUTION Alarms are displayed exclusively with the unit ON. Probe alarm trips a few seconds after the probe develops a fault; this alarm is reset automatically few seconds after the probe resumes normal operation. Before renewing the probe check the connections. The and temperature alarms are reset automatically as soon as the thermostat temperature returns to normal values. The external and (=) are reset as soon as the digital input is deactivated. If the digital input is configured as pressure switch (=) the alarm must be reset manually by switching the instrument off High and low temperature alarm memorization When the icon is lit, the unit is in alarm status: Flashing=Alarm active; Steady=Temperature alarm reset and memorized. To check the type of alarm and its duration proceed as follows: A Press either or. B C The display shows: for the high temperature alarm ( for low temperature alarm), followed by the Duration tim in h.mm. The device then resumes the normal display presentation as set. The duration is to be construed as a partial value if the alarm is still in progress Deleting saved or currently active alarms Proceed as follows: A With the alarm shown on the display, press and hold. B The message, will appear immediately and after 2 seconds it will start flashing to confirm that the values have been deleted. C If pressed again, the display shows the text (no alarm present). 1.8 Programming key Programming the key Program the device with the required values. Insert the key with the device switched on, and press. This starts the key programming procedure. flashes on display At the end, the device displays : for 10 seconds to indicate programming is successful; : to indicate programming has failed. Press to restart programming Programming the device with the key To program the device with a pre-programmed key, proceed as follows: Turn off the device or set it to standby via the keypad. Insert the programmed key. Switch on the device: start the automatic DOWNLOAD of data from the key to the device. flashes on display. At the end, the device displays for 10 seconds if programming is successful and control is resumed; if programming has failed. At this point repeat the operation or remove the key to resume normal control TTL serial line for monitoring systems The TTL serial line, available via the HOT KEY connector, enables interface with a compatible ModBUS-RTU monitoring system.

12 10 OPERATING AND MAINTENANCE MANUAL REP output-optional An X-REP can be connected to the instrument, via the HOT KEY connector. The X-REP output INHIBITS the serial connection.