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What is the cause for a flashing U on the display of a Berger Lahr Twinline drive?

Twinline drives monitor the external 24 volt power which is used to power the drive processor.
If the 24 volts is interrupted, as with loose connection, or below an acceptable level of 18.2vdc then "U" will flash on the display.

When the display flashes "U", this is an indication of an issue related to the external 24 volt power supply.

Please check the 24 volts to make sure it is stable and within acceptable range of 20 vdc to 30 vdc

rev 6-11-18
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