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9. Troubleshooting
By purchasing the laboratory power supply unit, you have acquired a product that is reliable and operationally safe.
However, problems and malfunctions may still occur.
This section explains how to troubleshoot common issues:
Always observe the safety information in these instructions.
Regularly check the technical safety of the device e.g. for damage to the housing, etc.
Any other repair work must always be carried out by qualified experts familiar with the hazards involved
and with the relevant regulations. Unauthorised modifications or repairs to the device will invalidate the
guarantee/warranty. Fuses are replacement parts and not covered by the warranty/guarantee!
Error / Status display
Possible cause
The power supply does not
switch on.
Is the power indicator on the power supply lit?
Check the mains voltage (you may also want to check the mains fuse in the
device or the line circuit breaker).
Connected consumers don't
work.
Is the correct voltage set?
Is the polarity correct?
Check the technical specifications of the consumers.
Is the overvoltage protection (OVP) active?
The “OT” display lights up.
The power supply is overloaded and overheated.
Allow the device to cool down while switched off.
The “CC” display lights up.
Constant current mode
The preset current was exceeded. Check power consumption on your con-
sumer and increase the current limitation on your power supply, if necessary.
The “CV” display lights up.
No Error: Constant voltage mode
The power supply works normally. At the output, the set constant voltage is
output.
The “ENG” display flashes.
No error: status display. The large setting range of the output voltage was
selected for USB-output USB-B1. The “MODE” switch is pressed.
VLP 1303 USB // VLP 1405 USB // VLP1602 USB
The “OVER VOLTAGE” display
lights up.
The preset level for overvoltage protection has been exceeded. Output A has
been switched off.
Reset the device as outlined in chapter “Resetting OUTPUT A” on page 39.
