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Quattro DC Troubleshooting
Name Description
Possible Causes & Corrective Action
LS Hit Current
LMT (alarm)
The line side is or was being
limited by the motoring current
limit or regenerative current
limit setting. This can limit
current into the dc bus leading
to an under-voltage condition,
or limit current into the line
leading to a bus over-voltage
condition.
Improper Line Side Menu Parameters (A5)
Verify and correct all Line side (A5) parameter
data
Low Line Voltage
Input line voltage is too low causing current to
be too high for the operating power level
Verify INPUT L-L VOLTAGE (A5)
LS HW/SW
Motor side software is
installed in the line side control
board.
Improper software
Replace Line Side A1 Board with correct
software or reprogram Line Side A1 board with
correct program
LS IGBT 1,2,3
A de-saturation condition has
been detected on the specified
line side IGBT module.
Faulty IGBT or momentary short
Recycle Power on Drive
LS IP Comm
A fault has occurred in the
communications channel
between the Line side and
Motor side processors. This
was detected on the line side.
Miscommunication problem
Verify proper software installed in Line Side
and Motor Side processors
If re-occurs, replace PCB A2
LS Overcurr
The hardware has detected an
over-current condition on the
line side power converter.
Overcurrent Problem
Check for a possible short circuit in motor or
external power wiring.
Poor Regulator Tuning
Check parameters
Lower value in PLL FILTER Fc (A5)
Noise Glitch
Power Cycle drive
If re-occurs, check wiring for EMC Compliance
LS Overload
An overload condition has
been detected on the line side
power bridge.
Excessive Field Weakening
Verify Weak Field motor parameter (A5)
Accurate Motor Parameters
Verify motor nameplate values are entered
correctly
Excessive Current Draw
Decrease accel/decel rate
Mechanical brake not releasing properly
Motor Problem
Check for motor failure
Drive Sizing
Verify drive sizing with motor ampere
requirements. May need a larger capacity
drive
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