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Troubleshooting
149
Name
Description
Possible Causes & Corrective Action
Uv Alarm
Generated during a run condition
when the DC bus voltage drops below
the user specified percent of the input
line-to-line voltage. The input line-to-
line voltage is specified by the Input L-
L Volts parameter and the fault level is
specified by the Undervoltage Alarm
Level parameter.
Low Input Voltage
➲
Check INPUT L-L VOLTS (A4) and UV
ALARM LEVEL (A4) parameters
➲
Disconnect Dynamic Braking resistor and re-
try.
➲
Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
➲
Check for a missing input phase
➲
Check power line disturbances due to starting
of other equipment
Drive Accurately Reading the Dc Bus
➲
Measure the dc bus with a meter
➲
Compare that with the value on the digital
operator, DC BUS VOLTAGE (D2)
Hardware Problem
➲
The drive may need to be replaced.