Nilfisk-Advance Advance SC5000 Service Manual

49Service Manual – SC5000 04 - Control System
Power Module (A2) Error Codes
Power module error codes will be displayed on the main display. However, the error number is also ashed
on the two-color status LED on the module itself. The status LED has 2 colors; red and yellow. The red LED
will ash out which digit of the code is coming next, and the yellow LED will ash out the value of that digit.
For example, to ash out an M4 Overload error with a code of 034, the red LED will ash once, followed by
the yellow LED ashing 3 times. Then the red LED will ash twice, followed by the yellow LED ashing 4
times.
2-011 Precharge Fail
Description
The capacitor bank failed to charge to the KSI voltage. The K2 relay will not be
allowed to close.
Setting
Conditions
The DC bus did not charge to within 5 volts of the KSI voltage
within 1.5 seconds.
When Monitored
Bootup
Possible Causes
To reduce the amount of arcing inside the K2 relay when it closes, the power module
pre-charges the DC bus capacitors using KSI power through a current limiting
resistor. If the voltage across this resistor remains more than 5 volts, the power
module knows that the DC bus is not charging properly, and something is bleeding
power out of the DC bus. This may be caused by:
• A device connected to the DC bus has a low to medium resistance path to ground.
• Failed power module mosfets
Initial Action Reboot the machine to conrm the error is repeatable.
Troubleshooting Steps
1. Power down the machine, and disconnect the main battery connector in the electrical bay.
2. Isolate the B+ circuit.
a. Wait a few moments for the DC bus to self-discharge, and then conrm full-discharge by carefully
shorting the B+ and B- lugs on the power module. (There may be a brief spark.)
b. Disconnect the large red wire from the B+ lug on the power module.
c. Restart the machine.(Ignore the resulting K2 Contact Open error, 2-014)
– If the error persists, replace the power module.
– If the error clears, go to step 3 to isolate the load versus MOSFET failure.
3. Isolate the motor circuits.
a. Power down the machine, and disconnect the main battery connector in the electrical bay.
b. Reconnect the main power cable to the B+ lug on the power module.
c. Conrm full-discharge of the DC bus by carefully shorting the B+ and B- lugs on the power module.
d. One at a time, disconnect each motor output on the power module.
e. Restart the machine.
– If the error clears, the motor circuit has a low to medium resistance path to ground. Diagnose and
repair the circuit.
– If the error persists and all motors have been disconnected, replace the power module.

Nilfisk-Advance Advance SC5000 Specifications

General

Brand	Nilfisk-Advance
Model	Advance SC5000
Category	Scrubber
Language	English