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“u” Low DC Bus

This fault is indicated by the display showing a “u”. Indicates a fault involving the DC

bus and voltages or with its associated components.

Potential causes for the “u” Low DC Bus fault

• DC Bus falls below 96 VDC

• Low AC line, below 90 VAC for greater than 50 milliseconds (3 cycles of 60 Hz)

• RSR-2 module malfunction or improper installation

• Repeated rapid cycling of AC power to amplifier

• Removal of AC Input AC Voltage Normal

• Removal of Aux Supply Powering Logic (Normal)

Notes

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