57Service Manual – SC5000 04 - Control System
2-041 M1 Scrub Motor Overcurrent
2-042 M2 Scrub Motor Overcurrent
Description
The power module has detected scrub motor current has exceeded the limitations of
the power module.
Setting
Conditions
The power module detected current above 160 amps to the
brush motor. This is a short circuit condition.
When Monitored
Always
Possible Causes
• Motor short
• Wiring short
Initial Action None
Troubleshooting Steps
1. Disconnect the scrub motor, and check the resistance of the harness contacts leading back toward the
power module.
− If the resistance is at or near 0 ohms, the M1 and M2 wires are shorted to each other. Repair or
replace the harness.
− If the resistance is not near 0 ohms, then the motor is at fault. Replace the scrub motor.
Note that the scrub motor resistance is normally very low (less than 1/2 ohm), so that is not typically
used as a conclusive diagnostic test.
2-043 M3 Sweep Motor Overcurrent
Description
The power module has detected sweep motor current above 160 amps, which
exceeds the limitations of the power module.
Setting
Conditions
Same
When Monitored
Always
Possible Causes
Because the overcurrent condition has reached the maximum permissible amperage
of the power module, it is likely that the motor or control wiring is shorted.
Initial Action None
Troubleshooting Steps
1. Disconnect the motor connector.
2. Check the resistance between the contacts on the harness leading back toward the power module.
− If the resistance is at or near 0 ohms, repair or replace the harness.
− If the resistance is not near 0 ohms, replace the sweep motor.
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