SC800 User Manual

User Manual - Page 155

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 155

Does Not Propel Forward or Reverse with No Trip Type set

In the event the machine will not propel and there are no Trip Codes or Trip Types to narrow down the problem area,

systemacally check the Drive Motor Controller power supplies, inputs and outputs. Use the Service Test Mode to speed

your diagnosis. Check to see if the Drive Motor Controller is sending signals to the Main Machine Controller that indicate

it is trying to move the machine. If it is, that conrms that the input requests to the Drive Motor Controller are good

and that it is trying to respond to them. Next, check to see if there is voltage across the motor terminals. If the voltage is

above 6 volts and the motor is not turning, the motor is the problem (Check the carbon brushes). If there is no voltage to

the motor, the controller or wiring has failed.

Possible Causes

• Baery voltage too low

• Controller not receiving input requests for travel

• Drive motor

• Drive motor controller

• Wiring

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Nilfisk SC800 Heavy-Duty Cleaning

User Manual - Page 155