Brush Motor Current Draw Test - Nilfisk-Advance Advance SC500 X20 B Service Manual

Service Manual – SC500

Brush Motor Current Draw Test

WARNING: This procedure must be performed by qualified personnel only.
1 Drive the machine on a level floor.
2 Remove the brush
3 Disconnect the drive system connector (A) (Figure 6) on the Main machine controller (B) to disable
machine movement
4 Turn on the machine by the key and the button
5 Press the One-Touch button
6 Apply the amperometric clamp (C) to an electrical cable (D) of the brush motor
7 Activate the brush by pressing the paddle, then check that the brush motor current draw is between 3
and 4A at 20V(*)
8 Deactivate the brush by releasing the paddle and raise the brush deck by pressing the One-Touch
button
9 Remove the Amp clamp (C)
10 If the amperage is higher, perform the following procedures to detect and correct the abnormal
amperage:
◦ Check the brush motor carbon brushes
◦ Remove the brush motor then check the condition of its components
11 If the above-mentioned procedures do not lead to a correct amperage, it is necessary to replace the brush
motor
A
Figure 6:
(*) Voltage value supplied by the Main machine controller to the brush gear motor when the gear motor cur-
rent draw is less than the value of the RPM parameter
to lower the brush deck
B
34 - Scrub System, Disc
C
D
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