Service manual

Electrical Service Manual V4.0
4
4-6
CURTIS 1227 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. +24 volts is taken from the main circuit breaker
and it is switched 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 #15 of the 16 pin Molex connector.
THROTTLE
The throttle uses a 5K hermetically sealed potentiometer to sum the high (4.8 Volts +/- 0.2
volts) and low (0.2 Volts +/- ).2 volts) reference voltages from the controller. The output
from the potentiometer is a varied voltage from +0.2 volts +/- 0.1 volt to 4.8 volts +/- 0.1 volt.
This signal is then sent to the controller on pin #4 of the 16 pin Molex connector.
REVERSE SWITCH
The reverse switch sends +24 Volts DC from the positive buss bar to Pin #11 on the 16 pin
Molex connector on the Curtis controller. This tells the controller that when it receives a
throttle signal from the throttle potentiometer to move in a reverse direction.
BRAKE OUTPUT
The brake output of the controller is used to turn a solenoid on and off the controls when
the brushes run. This output is turned on by the controller immediately when the machine
is put in motion and stays on for 1 second after the throttle input is turned off.