SC 750 ST User Manual

Loading ...

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

Form Number 56043150 Page 27

Input Tests

Speed Control Forward/Reverse Signal –The yellow Baery LED turns on when in the service test mode whenever the

speed controller tells the Main Machine Controller that it is aempng to drive the machine either forward or reverse.

This is useful when diagnosing a no drive problem. If the light comes on when you aempt to drive the machine forward,

it means that the Drive Controller has seen the request and responded to it.

Speed Control Reverse Signal – The green Baery LED turns on when in the service test mode whenever the speed con-

troller tells the Main Machine Controller that it is aempng to drive the machine in reverse.

Service Test Mode – SC750 and SC 800 Models (Control Panel with membrane switches)

To enter the service test mode: (Start with the baery charger unplugged and the key o)

1. Press and hold the scrub on/o switch and vacuum/wand switch together.

2. While holding both switches, turn the main power key switch to the on posion.

3. Connue to hold both switches about 3 seconds unl the

display shows “Programming Opons”, then release the

switches.

4. Press the soluon decrease buon unl you see “SERVICE

TEST MODE” then press the soluon on/o switch to

enter the Service Test Mode. (Note: Turn Key Switch o to

exit mode).

Now that you are in service test mode, you can request that the controller operate the various outputs and verify certain

inputs via the LCD display. If any faults occur during tesng, they will be displayed as well.

Output Tests

Brush Deck Li Actuator – Press the Scrub Increase Switch to move the actuator downward to the next posion. Watch

for the actuator to move. Press the Scrub Decrease Switch to move the actuator up one posion. The LCD display for

“DECK” will show “On” when the controller is trying to move the actuator and “O” when it is not. Machines with disc

scrub decks have three posions while cylindrical decks have only two. Note: If the switch inputs are not reporng cor-

rect informaon, the controller will not understand the current actuator posion and will not aempt to move the actua-

tor.

Brush Remove Contactor (Relay) – Press the Brush Remove Switch to energize the brush remove relay. (During this test

the Brush Motor Contactor will be de-energized) Listen closely for the relay to click. (It is a so click. It won’t be heard

in a noisy room.) Press the switch again to de-energize the relay. The LCD display for “BREM” will show “On” when the

controller is trying to energize the relay and “O” when it is not.

Loading ...

Nilfisk SC 750 ST Heavy-Duty Cleaning