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Quattro DC Troubleshooting
Drive Faults, Alarms, and operator messages along with possible causes and corrective actions are
listed below.
Note:
• fault - a severe failure that will stop a drive if it has been running and prevent the drive from
starting as long as it is present. All faults require some type of action by the user to clear.
• alarm - only meant for annunciation. It will NOT stop the operation of the drive or prevent the
drive from operating.
• operator message - operator communications message. It will NOT stop the operation of the
drive or prevent the drive from operating.
Name Description
Possible Causes & Corrective Action
A to D Fault
The Analog to Digital
conversion on the drive control
board is not working properly.
Drive Control PCB Failure
Replace Drive Control board
BAD SRL
CHKSM (alarm)
More than two messages with
bad checksums have been
received over the serial
channel.
Electronic noise interference
Verify there is no electronic noise interference
Baud rate mismatch
Baud rate mismatch is between drive and car
controller. Verify baud rate settings.
Bridge Ground
A ground fault has been
detected by the hardware on
the motor side. The current
going to A1 armature motor
lead does not match the
current returning from the
motor armature lead A2.
Check Motor Wiring
Check motor wiring and motor for insulation
breakdown or unintentional contact to other
objects
Ensure proper connection of shield drain wires
to chassis
Bad Current Sensor
Brk Hold Flt
The brake hold command and
the brake feedback did not
match for the time specified
with Brake Hold Time
parameter.
Check Parameter Settings
Check the correct logic input is configured for
the correct TB1 terminal and set to MECH
BRK HOLD (C2)
Check BRAKE HOLD SRC (C1) parameter for
the correct source of brake pick feedback
Check BRAKE HOLD TIME (A1) parameter for
the correct brake hold time
Wrong assignment of Normally Closed contact
mask (C2)
Increase BRAKE HOLD TIME (A1)
Check BRK HOLD FLT ENA (C1)
Verify Brake Settings
If drive is controlling brake, verify a logic output
is set to BRAKE HOLD (C3)
Check for an open circuit between the brake
pick pilot relay and the logic output assigned to
brake pick control
Mechanical Brake Hold Signal Wiring
Defective Brake Hold Coil
Defective Brake Hold Auxiliary contactor used
for sensing the brake state
If nuisance fault, the fault can be disabled by BRK
HOLD FLT ENA (C1) parameter.
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