SC800 User Manual

User Manual - Page 108

For SC800. Also, The document are for others Nilfisk models: 56112000(SC750-26D), 56112004(SC750-28D), 56112006(SC750-28C), 56112012(SC750 ST-26D), 56112013(SC750 ST-28C), 56112016(SC800-28D), 56112018(SC800- 28C), 56112024(SC800-32C), 56112028(SC800-34D), 56112032(SC800 ST-34D), 56112780 (SC70- 28R)

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Service Manual: SC750, SC800, SC 750 ST, SC800 ST

Form Number 56043150 Page 108

Troubleshooting

Scrub Motors Do Not Turn On

Possible Causes

• Brush contactor

o Open or shorted winding

o Burned contacts

• Wiring

• Main Machine Controller – Not energizing the brush contactor.

• Drive Motor Controller – Not providing “machine moving signal”

Scrub Deck Will Not Raise or Lower

Possible Causes

• Mechanical binding for the actuator linkage

• Brush Head Actuator – Check both the motor and the posion switches. Only one posion switch should be open

at a me and it should open at the correct posion.

o Actuator Motor

 Unplug the actuator connector and momentarily supply fused 24v power and ground to the

two motor terminals to see if the motor will operate. (Machine harness wire color Pink wire and

Gray wire). Reverse the polarity to drive it in both direcons. If the motor will not drive in both

direcons, replace the actuator. If it does drive in both direcons, proceed to check the posion

switches.

o Posion Switches

 Access the Main Machine Controller and unplug the electrical connectors.

 Check the retracted posion switch.

• Put the black ohmmeter lead on the Brown wire at the J2 connector pin 2.

• Put the red ohmmeter lead on the White wire at the J2 connector pin 3.

• Drive the actuator motor all the way up and down using jumper wires powered by bat-

tery posive and negave. Connect them to the two actuator motor wires at the Main

Machine Controller connector. (Pink wire at connector J1 pin 4 and Gray wire at connec-

tor J1 pin 5.) Change polarity to change direcon. Immediately remove jumper wires at

the end of motor travel.

• Monitor the ohmmeter. It should show an open circuit (no connuity) only when the

actuator is in the retracted posion. In all other posions it should show a closed circuit

(connuity).

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Nilfisk SC800 Heavy-Duty Cleaning

User Manual - Page 108