24
System malfunctions
- continued -
Action against high frequency interference
All connected inductive loads such as contactors and actuators must be provided with
RC combinations in accordance with the specifications of the manufacturer.
Should sporadic failures occur in installations susceptible to faults (e. g. malfunctions due to out-of-
phase switching operations) we recommend the following actions in order to suppress interferences:
HF interference suppression of voltage supply by means of ferrite rings and
HF interference suppression of CAN bus line by means of hinged-shell ferrite rings.
Replacing control unit
1.
Cut off power supply
to the equipment!
2. Detach terminal strips
A
and
B
. For this purpose turn the right and left fixing screws in direction
of the arrow until the terminal strip can be detached.
3. Undo the fixing slide in order to snap out the controller and take it off the supporting rail.
When ordering spare parts please state the serial number indicated on the name plate.
Malfunctions
Fault-finding list for control unit TRS 5-40
Switchpoint “MAX temperature” not yet exceeded – but MAX temperature alarm is raised
Fault:
The temperature sensor is defective.
Remedy:
Check whether the temperature sensor gives correct readings (see table “Basic values of
measuring resistors” in the installation manual TRV 5-40). In case of incorrect readings
replace the measuring element of the temperature sensor.
Temperature not below switchpoint “MIN temperature” – but MIN temperature alarm is raised
Fault:
The temperature sensor is defective.
Remedy:
Check whether the temperature sensor gives correct readings (see table “Basic values of
measuring resistors” in the installation manual TRV 5-40). In case of incorrect readings
replace the measuring element of the temperature sensor.
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
