Quattro DC Troubleshooting
102
Name Description
Possible Causes & Corrective Action
Curr Reg Flt
Declared if the current
regulator loses the ability to
generate the current required
by the speed regulator.
Problem with Motor Contactor
Verify that motor contactor is closing
Verify motor contactor is not opening
unexpectedly
Faulty current feedback signals
Verify that reported drive current is zero when
drive is not operating
Verify connections to current transducers
Loss of gate power supply
Verify base block jumper is between TB2-7
and TB2-14
Incorrect DC Bus Voltage reading
Measure the dc bus with a meter
Compare that with the value on the digital
operator, MS BUS VOLT (D2) or DC BUS
VOLTS (D3)
Increase the boost voltage
Inaccurate Motor Parameters
Verify motor nameplate values (A6) are
entered correctly
Motor Problems
Verify Motor Armature does not have an open
armature wire
DCU Data Flt
The DCU parameters
checksum is invalid on the
motor side.
Parameters Corrupted
Check & re-enter parameters and power cycle
the drive
If re-occurs, replace Drive Control board
Dir Conflict
(alarm)
Declared when the speed
command is held at zero due
conflict with the analog speed
command polarity and the run
up / run down logic
DIR CONFIRM (C1) must be
enabled.
Check Parameter Settings
Sensitivity determined by the ZERO SPEED
LEVEL (A1)
Confirm Speed Command Polarity
Check polarity of the analog speed command
on analog channel #1
Compare that with the RUN UP (positive) and
RUN DOWN (negative) logic input status
If nuisance, the function can be disabled by
DIR CONFIRM (C1) parameter.
Drive Temp.
(fault)
One or more of the IGBT
modules on the motor side
power bridge has exceeded
95C (203F).
Overtemperature Problems
Verify that the two fans located under the
power module are both working properly
Inspect and clean air intake filters
Verify ambient temperature is less than 45C
Verify drive is sized correctly
Possible defective temperature sensor
Hardware problem
Replace the motor side product interface
board (A4)
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