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11. Troubleshooting
By purchasing the laboratory power unit, you have acquired a product that is reliable and operationally safe. Neverthe-
less, problems or errors may occur.
For this reason we want to describe how to troubleshoot potential malfunctions:
Always follow the safety instructions!
Error
Possible cause
The power unit cannot be switched
on.
Does the operating display light up on the power unit (2)?
Check the mains voltage (you may also want to check the mains fuse in
the device or the line circuit breaker).
Connected consumer devices do not
work.
Is the voltage set correctly?
Is the polarity correct?
Check the technical data of the consumers.
The “REAR CONTROL” display is lit.
The device can not be operated via
the rotary controls.
Remote control operation is active.
Put the rear “MODE” slider into the “Normal” position.
The “O P PFF” display is lit.
The DC output was switched off through the remote control output
(16)
.
Release the connection between contacts 4 and 5. The output is
switched on again.
The output current is limited to 5
A, although the current settings are
higher.
The front connection is limited to no more than 5 A.
For higher currents, connect the consumer to the rear main output.
The “CC” LED is lit.
Constant current operation
The preset current was exceeded. Check power consumption on your
consumer and increase the current limitation on your power unit, if
applicable.
The “C.V.” display is lit.
Constant current operation
The power unit works normally.
The output provides the constant voltage set.
OVP
Over-voltage protection
See chapter “Protective Devices”
OtP
Over-temperature protection
See chapter “Protective devices”
OLP
Overload-protection
See chapter “Protective devices”
