Quattro DC Troubleshooting
116
Name Description
Possible Causes & Corrective Action
Open Armature
rmature current reference has
remained above 10% of rated,
but the armature current has
remained below 2% of rated for
more than 1 seconds
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
Note: This fault cannot be reset, unit must be
powered down before fault will clear.
Overcurr Flt
The motor side power
converted has detected that
280% rated amps has been
detected by the current
transducers through the
product interface PCB (A4).
Overcurrent Problem
Check for a possible short circuit in motor or
external power wiring.
Poor Regulator Tuning
Check parameters
Complete the motor auto-tune
Wiring issue
Make sure that the armature wires from the
left side of the motor side power module go up
through the CT5, and the one on the right
goes up through CT6.
Check that the CT cable is plugged in
correctly, CT5 should plug into CT5 and then
CT6 plugs into CT6
Encoder
A defective encoder may sort of work but can
glitch the speed regulator.
Overspeed Flt
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.
Poor Regulator Tuning
Check INERTIA (A1) and RESPONSE (A1) for
speed regulator tuning
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.
Overvolt Flt
The DC bus voltage has
exceeded the maximum
allowed value.
Line Converter Problem
Verify the line converter did not shutdown
while the motor controller was in process of
regeneration
Verify AC line didn’t lose a phase while drive
was in the process of regen
Check Parameter Settings
Bad tuning of either the motor side regulators
Contactor Problem
Verify motor contactor did not open while motoring
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