Service manual

Electrical Service Manual V4.0
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CURTIS 1203A CONTROLLER
CURTIS 1203
The Curtis 1203A controller was used on our model 29 & 35 walk
behind scrubbers. This controller was a non programmable
controller we used on all of these machines built with Central
Command I. This controller has true regenerative and dynamic
braking providing complete downhill and deceleration speed con-
trol. The traction control parts are all housed internally including
the forward, reverse and power contactors. All connections to the
controller are made with quick connects and plug type power con-
nectors to allow easy servicing of the controller.
FEATURES
- Infinitely variable drive speed and regenerative braking control.
- High efficiency MOSFET power design.
- High frequency silent operation.
- Ultra smooth low speed performance.
- Dual ramp automatic reversing provides a smooth deceleration / acceleration.
- Motor current limiting in both drive and brake modes.
- Throttle fault detection / auto shut down.
- Thermal protection auto limits controller current
- Battery under voltage protection.
- Power failure default breaking.
SPECIFICATIONS
Operation voltage: 24 Volts DC
Controller capacity: 75 Amps
Outputs
Drive
Auxiliary
The 1203A controller was not programmable.
The 1203A controller required suppression diodes be wired in parallel to the coil of sole-
noids to control voltage spikes when the solenoid was turned off.
CURTIS