Troubleshooting; Open Circuit; Drive Motor: The Fuse Opens The Circuit; The Machine Does Not Move - Nilfisk-Advance BA 600S Service Manual

TROUBLESHOOTING

Open circuit

The fuse (55) determines the open circuit. This system allows to prevent the circuits and the drive motor from being
damaged under overload conditions.
If there is an open in the electrical circuit, the possible causes are the following.

Drive motor: the fuse opens the circuit

Possible cause:
1. Bulky debris or cords under the machine or around the driving wheels (remove the debris).
2. Motor damaged (check the motor electrical input).
3. Floor gradient excessive (do not use the drive function to overcome excessive slopes).
4. Drive board wiring harness short-circuit (repair).
5. Drive board malfunction (replace).

The machine does not move

Possible cause:
1. Battery voltage too low (charge the battery).
2. Drive on/off switch (46) turned to "0" or damaged.
3. Potentiometer inside the paddle (14) misadjusted or faulty (adjust or replace).
4. Speed adjuster (7) faulty (replace).
5. Drive microswitch misadjusted or faulty (adjust or replace).
6. Drive electronic board malfunction (replace).
7. Fuse (55) open (eliminate the cause of the open circuit).
8. Wiring harness damaged (repair).
9. Drive motor carbon brushes worn (replace them).
10. Drive motor malfunction (replace).
CAUTION!
When turning on the machine through the key (10), the drive system blocks if the paddle (14) is
activated, and the related microswitch is closed.

Drive electronic board diagnostic LED

The following chart shows the meaning of the number of flashes of the red LED, situated on the drive electronic board,
in the event of a system malfunction.
Number of
flashes
1 Drive electronic board malfunction
2 Thermal fuse activation
3 System activated when turning on the machine
4 Potentiometer inside the paddle (14) - drive board
wiring harness open
909 5484 000(1)2004-03
MEANING OF RED LED FLASH NUMBER AND REMEDY
Meaning
SERVICE MANUAL
Remedy
Replace
Wait for the electronic board to cool down, then check
the drive motor electrical input and determine the
causes of the overheating
Check the adjustment of the drive microswitch in the
paddle (14)
Check the connections
45