Mec 2033ES - Sevcon Motor Speed Controller

October 2008 "2033ES / 2633ES" Service & Parts Manual - ANSI Specifications
Page 4-14
SEVCON MOTOR SPEED CONTROLLER
The Sevcon Motor Speed Controller (MC-1) is a microprocessor designed 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 Controller 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 indicating the reason for the shutdown.
Refer to the
LED Diagnostics Definitions and Sevcon Motor Speed Controller - Connections on
the following pages.
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)