Warning Description

No input voltage can be detected. This warning will be displayed only if a 24VDC backup power supply is powering the DCMU. The most likely cause is the CCR feed breaker being off. When the CCR determines a warning or setpoint alarm, it will engage the indicator light and the warning will be shown on line 1 of the CCR display. The CCR will continue to operate in the event of a warning. Although the CCR will continue operating, warning conditions must still be noted and fixed. Allowing the CCR to operate in a warning state may cause problems for efficiency, general safety, and longevity of equipment.

Attempt to Correct

Always maintain safe working conditions by using appropriate personal protective equipment (PPE) where necessary.
Turn the feed breaker on.
Use a DMM to determine if voltage is present.

Airport Lighting Company | Type L-828, Type L-829 Ferroresonant Constant Current Regulator