Specifications

Condition
Traction motor field
windings are shorted.
Truck Response
No Traction
Possible Causes and
Test Procedures
1. Check field windings
at traction motor for
shorted condition.
2. Check for continuity
between the FU 1 or
FU 2 terminal and the
motor frame. Refer to
the section Electrical
System 2200 YRM
1052 or Electrical
System 2200 YRM
929, Fuses.
There should be no
continuity. If
continuity is
measured, replace
traction motor.
Circuit Description
Logic
The controller checks for resistance in the field windings of the motor. If no resistance
is seen, the controller will fault.
LED
Code
Dash
Display
Model Programmer Display
3,3
Code
33
All
Field Open
Condition
The traction motor field
coil circuit is open.
Truck Response
No Traction
Possible Causes and
Test Procedures
1. Ensure wiring
connections are
secure.
2. Remove wires from
the FU 1 and FU 2
terminals and
measure resistance
between FU 1 and FU
2. Refer to the
section Electrical
System 2200 YRM
1052 or Electrical
System 2200 YRM
929, Fuses.
If high resistance is
measured, replace
traction motor.
Circuit Description
Logic
The controller checks for resistance in the traction motor field coil circuit. If no
resistance is seen, the controller will fault.
LED
Code
Dash
Display
Model Programmer Display
3,4
Code
34
All
Missing Contactor
Condition
Missing main contactor.
Truck Response
No Operation
Possible Causes and
Test Procedures
1. Ensure all wiring
connections to the
main contactor are
secure and tight.
2. Check FU 2. Refer
to the section
Electrical System
2200 YRM 1052 or
Electrical System
2200 YRM 929,
Fuses.
3. Check the main
contactor coil. Refer
to the section
Electrical System
2200 YRM 1052 or
Electrical System
2200 YRM 929,
Repairs.
Check coil
resistance.
MPW065E =
Approx. 14 ohms
Circuit Description
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