Replace controller.
• Failure of field current driver in controller.
Replace controller.
Dash Display
Controller LED
Handset or PC
CONDITION
AL6
6 Flashes
NO FIELD CURR
Low field current values measured by controller.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Cable connection to motor field is loose or damaged.
Verify connection of field wires to motor and controller.
• Motor field winding is open or too high.
Check motor field for correct resistance and
continuity. It should measure approximately 1.5 ohms.
• Field current sensor in controller has failed.
Replace controller.
• Main contactor circuit damaged or disconnected.
Verify electrical connection between controller
and contactor.
Check contactor coil for correct resistance of 52.0 ohms.
• Field current drivers in controller are damaged.
Replace controller.
Dash Display
Controller LED
Handset or PC
CONDITION
AL6
6 Flashes
STBY I HIGH
Controller detects motor current during standby mode.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Damaged controller.
Replace controller.
Dash Display
Controller LED
Handset or PC
CONDITION
AL7
7 Flashes
THERMAL PROTECT
Controller temperature is out of operating range.
TRUCK RESPONSE
Traction functions reduced below -10 C (14 F)
and above 75 C (167 F). Traction and hydraulic
functions disabled above 90 C (194 F).
POSSIBLE CAUSES AND TEST PROCEDURE
• Controller temperature is too hot/cold.
Move truck to cooler or warmer location and allow
controller to return to operating temperature.
• Controller temperature miscalibrated.
Install handset. Go to tester function and check
temperature. Controller and vehicle temperature
should be same as room temperature at initial
startup. If these temperatures differ, replace controller.
• Controller temperature sensor damaged.
Replace controller.
• Controller damaged.
Replace controller.
Dash Display
Controller LED
Handset or PC
CONDITION
AL8
8 Flashes
POWER FAILURE #1
Short circuit in device connected to controller.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURE
• Overcurrent detected in driven component.
Check main harness for damaged or shorted connections
to main contactor, brake, and electric valve coils.
Check main contactor, brake, and electric valve coils.
for correct resistance values.
Main contactor = 52 ohms
Brake coil = 29 ohms
Electric valve coils = 17.7 ohms
Value should be within ±10% at room temperature.
FOR REFERENCE ONLY 5/4/10 Rev A
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