October 2008 "2033ES / 2633ES" Service & Parts Manual - ANSI Specifications
Page 2-14
SEVCON MOTOR SPEED CONTROLLER
The Sevcon Motor Speed Controller, located in the lower control box, is a microprocessor de-
signed with the express purpose of operating the D/C electric motor at varying speeds. The
controller uses Pulse-width Modulation (PWM) technology on the Ground side of the motor to
control motor speed. Out of concern for operator safety and to prevent short-circuiting, the Con-
troller monitors certain circuits for potential abnormalities. When the controller senses a problem
it errs to the side of safety and stops all motor operation. The green LED will flash a code indicat-
ing the reason for the shutdown.
Refer to
Section 4: Troubleshooting
for diagnostic codes.
ART_2182
1
7
6
12
J5 Plug Pin Identification
PIN # WIRE # FUNCTION
1 22 B+ power input
(power up)
2 17 Lift, Drive or Steer functions input
(functions requiring motor)
3 18 Steer Requested
(adds additional motor speed for steer)
4 3 Enable Switch signal input
5 21 Speed cut-back
(24 Volts = full speed, 0 Volts = creep speed)
6 16 Motor Start Relay signal
(GROUND signal to activate Motor Start Relay)
7 41 Lift Valve B-
(provides GROUND signal to Lift Valve)
8 none none
9 14 Accelerator reference signal
(3.6 Volts to Potentiometer)
10 none none
11 none none
12 none none
Cable Connection Identification
B+ Battery Positive Cable from 250 AMP Fuse
B- Negative Battery Cable and GROUND wire (15) connection
M2 Motor Ground
(Pulse-Width Modulated [PWM] variable speed control)
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