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Quattro DC Troubleshooting
Name Description
Possible Causes & Corrective Action
No Field Cable
A disconnected field cable has
been detected.
Missing Cable
Check for defective of missing field cable
Open Armature
Armature current reference
has remained above 10% of
rated, but the armature current
has remained below 2% of
rated for 1 second.
Contactor Problem
Verify correct operation of power poles on
motor armature contactor
Motor Problem
Verify motor is wired correctly
This fault could indicate an open armature in
motor
This fault could also indicate a brush problem
in the motor
Overcurr Flt
An IGBT power module is
sensing an over-current or
over-temperature condition
Overcurrent Problem
Check for a possible short circuit in motor or
external power wiring.
Poor Regulator Tuning
Check parameters
Noise Glitch
Overspeed Flt
Poor Regulator Tuning
Check Parameters for speed regulator tuning
Generated when the motor
has gone beyond the user
defined percentage contract
speed for a specified amount
of time.
Check Parameter Settings
Check OVERSPEED LEVEL (A1) parameter
for the correct level.
Check OVERSPEED TIME (A1) parameter for
the correct time.
Speed Request
Excessive speed dictation signal from car
controller
Improper feed forward signal
Note: This fault is defined by Overspeed Level
parameter and Overspeed Time parameter.
Overtemp Flt
One or more of the IGBT
modules on the drive side
power bridge has exceeded
105
°C (221°F).
Overtemperature Problems
Manually verify 3-speed blower has correct
operation
Inspect and clean air intake filters
Verify ambient temperature is less than 45°C
Inspect IGBT modules for proper mounting
Verify drive is sized correctly
Possible defective temperature sensor
Excessive Current Draw
Decrease Accel / Decel rates
Mechanical brake not releasing properly
Excessive Field Weakening
Verify Weak Field Motor Parameters (A5)
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