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Quattro DC Troubleshooting
Name Description
Possible Causes & Corrective Action
LS PCU Data
PCU parameters checksum is
invalid on the line side.
Parameters Corrupted
Check & re-enter Line Side parameters and
power cycle the drive
LS Phase
The line side converter has
detected the loss of one or
more phases of the AC line.
Input Line to Line Phase Loss
Verify all 3 AC line phases are correct
Verify wiring to / from contactor UTM
Verify 3 phase signal wiring to PCB A8
If re-occurs, replace A8
LS Size
The line side power converter
has detected that the power
bridge and current sensors, do
not match.
Hardware Mismatch
Size of the power bridge does not match the
rating as defined on the cube ID board.
Check for correct Cube ID board located on A3
board
LS Undr Voltg
(alarm)
The DC Bus has fallen below
the under voltage alarm level.
The alarm level is set by 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
Verify Parameters
Line Converter Problem
Verify the line converter did not shutdown
while the motor controller was in process of
regeneration
LS Undrvolt
(fault)
The DC Bus has fallen below
the under voltage fault level.
The fault level is set by 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
Verify Parameters
Line Converter Problem
Verify the line converter did not shutdown
while the motor controller was in process of
regeneration
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