µRack
Cod. CAREL +03P220431 rel. 0.0 del 08/09/05 - preliminary version
6
2.2 LED display and Icons
The display shows the control value, temperature or pressure. depending on the selection made from the keypad.
In the event of alarms, the display shows the monitored and the alarm information in sequence.
ICON Description
On when the unit of measure selected is BAR
On when the unit of measure selected is °C
On when there is an ACTIVE ALARM
1) On when the MANUFACTURER parameters are being configured
2) If flashing with the ALARM icon indicates the compressor maintenance hours have been exceeded.
1) On when the value read by the suction probe is displayed
2) If flashing with the ALARM icon indicates the activation of suction probe alarms:
High Temp.
Low Temp.
Probe not connected
1) On when the value read by the discharge probe is displayed
2) If flashing with the ALARM icon indicates the activation of discharge probe alarms:
High Temp.
Probe not connected
1) On when the fan parameters are being configured.
2) On when at least one fan is operating
3) If flashing with the ALARM icon indicates the activation of fan alarms
1) On when the compressor parameters are being configured.
2) On if at least one compressor step is active
3) If flashing with the ALARM icon indicates the activation of the compressor alarms
1) Indicates the number of compressors on.
2) If flashing indicates the ON/OFF call for a new compressor step, while the device is awaiting the expiry of the
delay times.
3) If the controller is used for fan control only (“/01”=0) then the icon shows the status of the fans.
3. Starting the unit
3.1. Starting for the first time
After having checked the connections, power-up the unit.
When started for the first time, the controller performs a LAMP TEST and uses the default values selected by CAREL for all the configuration parameters: Unit with
2 compressors + 2 fans + alarm relay.
3.2. Unit configuration
The unit can be set as single or two circuit, the number of compressors for one or two circuits using parameter /01; the number of fans can then be set using
parameter /09.
The maximum number of devices, compressors + fans, is 5 (maximum number of relays).
First the compressors and then the fans will be allocated, in sequence.
Relay no. 5 may be:
• an alarm
• a fan
The selection is made automatically according to the number of devices (fans and compressors) selected.
If 4 devices are selected (e.g.: 2 compressors + 2 fans) relay 5 can be used as an alarm relay (default setting), while if 5 devices are controlled (e.g.: 2
compressors + 3 fans), output no. 5 is automatically used to control a fan. In addition, the use of speed control, by phase control or inverter, can be set for the
fans, managed using the PWM signal.
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