Nilfisk-Advance Advance SC5000 Service Manual

52Service Manual – SC5000 04 - Control System
2-018 Undervoltage Cutoff
Description Insufcient voltage present at Power Module power supply
Setting
Conditions
Voltage below 18 volts.
When Monitored
Always
Possible Causes Loose or corroded connection
Initial Action None
Troubleshooting Steps
Isolate the cause by systematically checking voltages back to the battery. (Each test below assumes the
previous tests indicated an undervoltage condition, and that the current location is the rst position where
full voltage was detected.)
• If multiple modules are reporting similar errors, the fault lies at or near the main battery terminals, the
main ground lug, or the input lug at the K2 relay.
1. Check the voltage between the B+ and B- lugs of the power module.
− If the voltage is at or near 36 volts, replace the power module.
2. Check the voltage between the B+ lug at the power module and the main ground lug in the electrical
bay.
− If the voltage is at or near 36 volts, repair or replace the ground wire leading to the power module.
3. Check the voltage at the output lug of the K2 relay and the main ground lug.
− If the voltage is at or near 36 volts, replace the positive wire between the K2 relay and the power
module.
− If the voltage is below 36 volts, replace the K2 relay.
2-021 M1 Scrub Motor Open
2-022 M2 Scrub Motor Open
Description Scrub motor is open circuit.
Setting
Conditions
The power module has detected no current on the M1 or M2
output lugs. The scrub motor uses both lugs. So these errors
should be reported together.
When Monitored
Always
Possible Causes
• If only one of these errors is reported, there is either a misplaced wire, or a short to
battery power (and a short circuit error should also be reported.).
• Disconnected motor.
• Worn carbon brushes
Initial Action Check Fuse F4.
Troubleshooting Steps
1. Unplug the brush motor connector.
2. Check the resistance between contacts 1 and 2 of the brush motor. (The static resistance should be
very low.)
− If the resistance is high (open circuit), inspect the Brush Motor Brushes described on page 185 or
Brush Motor Brushes described on page 198.
− If the resistance is low (0.5 to 1.0 ohms), repair or replace the wiring harness between the motor and
the power module.

Nilfisk-Advance Advance SC5000 Specifications

General

Brand	Nilfisk-Advance
Model	Advance SC5000
Category	Scrubber
Language	English