SC750 User Manual

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

Form Number 56043150 Page 55

On-board Battery Charger

An oponal on-board baery charger is available. Early machines used an S.P.E. charger and later machines use a Delta-

Q IC650 baery charger. Some early machines may have been updated to replace the S.P.E. charger with the Delta-Q

charger.

When equipped, the charger is mounted on the boom of the machine. Both chargers have an internal relay that inter-

rupts a power supply when the charger is plugged into an AC power outlet. This is called the “Interlock” circuit on the

wiring diagram. It prevents the machine from being operated while the baeries are charging. The interlock circult for

the S.P.E. charger is illustrated below. The Delta-Q interlock circuit is similar but it relies on the main baery posive con-

necon for the power source rather than a separate wire.

Here is how the baery charger interlock circuit works. The interlock relay contacts inside the charger are normally

closed, allowing the current to pass in and out of the charger to the Main Machine Controller and the Drive Motor Con-

troller. When the AC power cord is plugged in, the relay is energized and opens the relay contacts opening the circuit.

Delta-Q Charger

S.P.E. Charger

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Nilfisk SC750 Heavy-Duty Cleaning