Drives Service & Support
Fault Number: 04
Fault Display: Undervolt Fault
Fault Name: Undervolt Fault
Description: DC Bus voltage fell below the minimum value. [Low Bus Fault] are set to "enabled".
Corrective Action: This fault means the bus voltage has reached a hardware minimum value. It is typical to see this fault just before the drives HIM module goes dark when power is shut down.
Bus voltage where this fault will occur is as follows:
138 volts dc for 200-240 ac volt drives
280 volts dc for 380-480 ac volt drives
343 volts dc for 500-600 ac volt drives
Monitor AC line for interruptions. Low bus fault paramter 91 is used to disable this fault. While this fault can be disabled, shortly after this fault, if the power is not restored, the drive will physically shut down.
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