Bosch PSU 5000 Series Instructions For Assembly And Operation Manual page 55

Monitoring and
diagnostics
Remedy
Remedy
Remedy
Remedy
Remedy
Remedy
Remedy
7---4
PSU 5000 / PSG 3000
Instructions for Assembly and Operation
DC link voltage
The DC link voltage of the inverter is outside the permitted range.
Check mains supply.
Power supply unit fault
The voltage for the internal logic is outside the limit values. The power supply unit
board may be defective.
Call Bosch service department.
Overcurrent / Earth fault
` Earth fault of primary cable or primary winding of the welding current trans-
former.
` Short--circuit in the primary circuit of the welding transformer.
` Overcurrent due to controller overshoot with long secondary cables (length of
secondar welding circuit > 5 m).
Eliminate earth fault.
Eliminate short- -circuit.
Set DIP switch S3/2 to ON and S3/1 to OFF for long secondary cables
NOTE
This earth fault monitoring function does not guarantee personal protection.
Measuring loop fault
The measuring loop (between X11/3 and X11/4) is checked for short--circuits or in-
terruption prior to the beginning of the weld time.
Defective sensor cable
Replace cable
Faulty plug- -in connections
Check plug- -in connections
Incorrect connector assignment
Check connector assignment
Defective sensor
Replace transformer
1070 078 224--- 108