Nilfisk SC800 ST User Manual

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

Form Number 56043150 Page 149

Troubleshooting

The Drive Motor Controller is a PG Drives Technology controller from the I-Drive family. It performs onboard diagnosis

of itself and related circuits. If it sees a problem it sets a “Trip Code”. Trip codes are grouped by “Trip Types”. Either the

Trip Type or the Trip Code can be used to focus troubleshoong into a certain area. Trip Codes are more specic than Trip

Types.

The Drive Motor Controller uses the status wire to inform the Main Machine Controller when it has set a Trip Code and

which Trip Type the code belongs to. The main machine controller in turns displays an error code (3 on “Non-ST” models

and “1,1” on “ST” models) and it ashes out the Trip TYPE using one of the LEDs on the control panel.

Reading LED Trip Type Values

Trip types are represented by a single digit. “Non-ST” models use the Detergent LED to ash out the Trip Type value and

“ST” models use the High Soluon ow LED. A trip type 7 will ash the LED 7 mes, stay o for a brief pause and then re-

peat the cycle. The main machine controller turns on the LED whenever the voltage on the status line is low and turns it

o when the status voltage is high. These photos of a graphing voltmeter monitoring the status line can help you under-

stand what to expect for the LED ash out.

Trip Type 7 Trip Type 1 Throttle Input at Key-On

Note: If the Drive Motor Controller sees a “throle request” at pin 1 when the key is turned on, it will “ignore” the

request and tell the Main Machine Controller that there is a problem. The LED used to display the trip type value ashes

at a steady rate. It appears to momentarily ash o , then stay on for a bit longer period of me. This should not be

confused with a Trip Type 1 where there is more “o me” with a brief “on me”.When the throle request input is cor-

rected, the LED stops ashing and normal operaon is restored without the need to cycle the key o and back on.

Trip Code Table

Informaon in the following table is provided by PG Drive Technologies. It includes informaon on codes that may never

be seen in the Nilsk-Advance machine. For example, the SC750/800 model family does not ulize a solenoid brake, so

theorecally you should not ever see a trip type 9 (Solenoid Brake Trip), but in the event that you do, the table will

provide you with the informaon you need.

A specic Trip Code can only be obtained by using a PGDT (PG Drives Technology) program-

mer. This programmer is not required to troubleshoot drive system problems. If you have a

drive system problem, check to see if an LED on the control panel is ashing out the “Trip

Type” value. Use the table below to nd the trip type descripon. One Trip Type may be

related to mulple Trip Codes. You need to refer to the Code Descripon and Possible Causes

for ALL Trip Codes for a given Trip Type.

PGDT Programmer

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Nilfisk SC800 ST Heavy-Duty Cleaning