Bosch Rexroth PSI 6 Series Operating Instructions Manual page 428

428 / 460 Bosch Rexroth AG
Troubleshooting
Examples of self‐resetting faults include:
- Stop / No 24V
- Power voltage off / too low
- Synchronization / mains / DC-link voltage error.
"Non-self-resetting" faults can be reset via
• the BOS software
• a positive edge at the fault reset inputs of the I/O array of the weld
timer
• the RESET button on the timer's front side (for PSI 6x00)
• the diagnosis module (for PSI 6xCx)
The "Heat sink temperature too high" and "Overcurrent or earth fault"
errors must always be manually reset via the RESET button or on the
diagnosis module.
Example of a fault: Temperature monitoring responds
The integrated power unit indicates temperatures greater than/
1.
equal to 65° C (+5° C) to the integrated weld timer.
As a result, the weld timer stops all further sequences.
2.
The "Power unit temperature" error is displayed.
3.
Possible cause
Contaminated heat sink.
Ambient temperature too high.
Rating of the power unit too low.
Cooling water too warm or cooling
water flow too low.
Forced ventilation of air‐cooled units
is defective.
PSI 6xxx | 1070080028 / 08
Action
Clean heat sink.
Check installation area cooling for
proper installation and functioning.
Calculate duty cycle and check
selection on the basis of the load
diagram.
Check flow and/or temperature of
cooling water.
Check forced ventilation.