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Quattro DC Troubleshooting
Name Description
Possible Causes & Corrective Action
Undervolt Flt
Generated during a run
condition when the DC bus
voltage drops below the user
specified percent of the DC
link voltage. The fault level is
specified by the UV Fault
Level parameter.
Low Input Voltage
Check INPUT L-L VOLTS (A5) and UV FAULT
LEVEL (A4)
Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
Check for 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, BUS VOLTAGE (D2)
Poor Tuning of Line Side Parameters
Check DC BUS REG P GN (A5), DC BUS
REG I GN (A5), DC BUS V BOOST (A5), and
BUS VREF SOURCE (A5)
Line Converter Problem
Verify the line converter did not shutdown
while the motor controller was in process of
regeneration
UV Alarm
(alarm)
Generated during a run
condition when the DC bus
voltage drops below the user
specified percent of the dc link
voltage. The fault level is
specified by the UV Alarm
Level parameter.
Low Input Voltage
Check INPUT L-L VOLTS (A5) and UV
ALARM LEVEL (A4)
Verify proper input voltage and increase, if
necessary, the input AC voltage within the
proper range
Check for 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, BUS VOLTAGE (D2)
Poor Tuning of Line Side Parameters
Check DC BUS REG P GN (A5), DC BUS REG
I GN (A5), DC BUS V BOOST (A5), and BUS
VREF SOURCE (A5)
Table 1 : Troubleshooting Guide6
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