Service manual

Electrical Service Manual V4.0
5
5-2
CURTIS 1228 CONTROLLER
CONNECTIONS
BATTERY
The connections from the controller to the battery are made via 0.25” quick connects
(Spade terminals). The positive battery cable connects from the main circuit breaker to any
one of the 3 terminals labeled “B+”. The negative battery cable connects to any one of the
3 terminals labeled “B-”.
POWER SWITCH
The power switch is a very simple circuit. We take +24 volts from the main circuit breaker
and switch it on and off to the controller thru a SPST lighted switch. The signal is sent into
the controller thru a 16 gauge red wire into pin #5 of the 18 pin Molex connector.
THROTTLE
The throttle uses a 5K hermetically sealed potentiometer to sum the high and low throttle
reference voltages from the controller. The output from the potentiometer is a varied volt-
age from +0.2 volts +/- 0.1 volt to 4.8 volts +/- 0.1 volt. This signal is then sent to the re-
verse switch and the handle bar push button switch(es). Either one of these switches can
close the circuit passing the varied voltage signal through to the controller on pin # of the
18 pin Molex connector.
REVERSE SWITCH
The reverse switch circuit is very simple. There are two pairs of wires that go tho the DPDT
reverse switch. One pair (both black) send the throttle signal to the controller to move. The
other pair (blue & green) send the signal to the controller telling it when it moves to move in
the reverse direction.
BRAKE OUTPUT
The parking brake output of the controller is used to turn on and off a solenoid. This output
is turned on immediately when the machine is put in motion and it stays on for 1 second
after the throttle has been released.