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8.4
Control unit
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No.
Description
2
Undervoltage 24 V
4 *)
Modbus
communication
10 *)
Demo mode active
11
Basic electronic
system
12 *)
48V 1. Supply
13 *)
48V 2. Supply
15 *)
Cooling water
temperature
*) After the elimination of the error/fault, the error will be automatically reset.
Troubleshooting
Note
•
Malfunctions are indicated by a red, flashing LED above the control unit.
•
Malfunctions are indicated on the display of the control unit.
•
The errors/faults are displayed by way of a number.
•
Select the corresponding error/fault with the up or down key.
•
Acknowledge the errors/faults by way of the Enter key.
Cause
The supply voltage of the electronic
control system is too low (below 14.5
V).
The RS485 interface has not received
any telegrams for at least 10 seconds.
The demo mode has been selected.
No CAN communication between the
control unit (display) and the remote
I/O unit (basic electronic system).
Power supply unit no. 1 defective.
Power supply unit no. 2 defective.
Cooling water temperature too high.
•
The customer-provided filters
are blocked.
•
The customer-provided shut-
off valves are closed.
•
Control valve defective.
•
Failure of the control system.
VARISTAR Cooling unit SHX 30
Note
Check.
Check the function of the power supply
unit.
Check the fuses and replace them if
necessary.
Acknowledge the error.
Check the interface cable (RJ45) for signs of
damage and ensure that it is properly
connected.
Check the Modbus interface (interface
address RS485 > 0).
Contact the service department if
necessary.
Deselect the demo mode.
Contact the service department.
Check the CAN address.
Check the connecting cable between the
control unit (display) and the remote I/O
unit.
Check the power supply.
Acknowledge the error.
Contact the service department if
necessary.
Check and replace if necessary.
Check the fuses and replace them if
necessary.
Check and replace if necessary.
Check the fuses and replace them if
necessary.
Check and adjust if necessary.
Clean and replace if necessary.
Open.
Check the power supply. Replace the
control valve if necessary.
Contact the service department if
necessary.
Check and replace if necessary. Contact the
service department if necessary.
66
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