Graco LineDriver 25U670, Operation - Repair - Parts

Page: 26 / 40

Troubleshooting - Motor Controller
26 3A9034B
24
B+ Overvoltage
Cutback
1. Normal operation. Fault
shows that regen
braking currents
elevated the battery
voltage during regen
braking. Controller is
performance limited at
this voltage.
2. Battery disconnected
while regen braking.
Set: Battery pack voltage
exceeded the Overvoltage limit.
Clear: Bring battery pack voltage
below the Overvoltage limit (30V).
1. Continue using the unit.
2. Inspect all cables and
connectors from batteries to
controller.
25 +5V Supply Failure
1. Bad crimps or faulty
wiring.
2. Shorted motor encoder.
3. Shorted throttle.
4. Shorted ExactMil
potentiometer.
Set: +5V supply (pin 26) outside
the 5 V±10% range.
Clear: Bring voltage within range.
1. Inspect motor
encoder/thermistor cable and
connector. Disconnect motor
encoder and cycle unit power.
If the 5V supply fault clears,
replace the motor. If the 5V
supply fault persists, reconnect
encoder and repeat this
process for the throttle
assembly and ExactMil
potentiometer.
28
Motor Temp Hot
Cutback
1. Motor temperature is at
or above the
programmed
Temperature Hot
setting, and the current
is being cut back.
Set: Motor temperature is at or
above the Temperature Hot
parameter setting.
Clear: Bring the motor
temperature within range.
1. Move to cooler area, reduce
operating load.
29
Motor Temp Sensor
Fault
1. Motor thermistor is not
connected properly.
Set: Motor thermistor input (pin 8)
is at the voltage rail (0V or 10 V).
Clear: Bring the motor thermistor
input voltage within range.
1. Inspect motor
encoder/thermistor cable and
connector.
31
Main Contactor
Open/Short
1. Open or short across
contractor coil.
2. Dirty connector pins.
3. Bad crimps or faulty
wiring.
Set: Main contactor driver (pin 6)
is either open or shorted. This
fault can be set only when Main
Enable = ON.
Clear: Correct open or short, and
cycle Power Switch.
1. Inspect contactor coil cables
and connectors.
2. Test the contactor coil and
replace contactor if needed.
36 Encoder Fault
1. Motor encoder failure.
2. Bad crimps or faulty
wiring.
Set: Motor encoder phase failure
detected.
Clear: Cycle Power Switch.
1. Inspect motor
encoder/thermistor cable and
connector.
2. Replace motor.
37 Motor Open
1. Motor phase is open.
2. Bad crimps or faulty
wiring.
Set: Motor phase U, V, or W
detected open.
Clear: Cycle Power Switch.
1. Inspect U, V, W cables.
2. Replace motor.
38
Main Contactor
Welded
1. Main contactor tips are
welded closed.
2. Motor phase U or V is
disconnected or open.
3. An alternate voltage
path is bypassing the
contractor between
battery and B+ on the
controller before the
contractor engages.
Set: Just prior to the main
contactor closing, the battery
pack voltage (B+ connection
terminal) was loaded for a short
time and the voltage did not
discharge.
Clear: Cycle Power Switch.
1. Inspect contactor for welded
contacts and replace if
necessary.
2. Inspect all cables from the
battery pack to controller
looking for insulation damage.
3. Inspect U, V, W cables.
CODE DESCRIPTION POSSIBLE CAUSE SET / CLEAR CONDITIONS SOLUTION