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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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