Mec 2633ES - Sevcon Motor Speed Controller - Connections; PIN 1 - WIRE 22 (Battery Positive Input); Pin 2 Wire 17 (Lift, Drive or Steer functions requested); Pin 4 Wire 3 (Enable signal input)

"2033ES / 2633ES" Service & Parts Manual - ANSI Specifications October 2008
Page 4-17
FUNCTION VOLTAGE READING
Sevcon Motor Speed Controller - Connections
The following two pages describe the connections to the Sevcon Motor Speed Controller with a
brief description of their function and the voltage measurements under normal conditions.
Important: Batteries must be fully charged before troubleshooting!
A fully charged battery set on a 24 V DC system will have a nominal
voltage of 25.6 V DC
• Controller power-up and reference point for battery state-of-charge.
• Green LED indicates controller power-up.
• Power travels through the upper emergency-stop switch with upper
controls selected.
• 7-Flash code and 9-flash code indicate low voltage at this terminal.
PIN 1 – WIRE 22 (WIRE 9 ON EARLY UNITS)
Battery Positive
Input
Switched
5% less than battery voltage
• Controller begins the motor run sequence with this signal but still requires
a signal on pin 4 and a change on pin 9 before the motor will operate.
Pin 2 Wire 17
Lift, Drive or
Steer functions
requested
Motorized function is requested
15%-18% less than battery voltage
Pin 3 Wire 18
Steer Function
Requested
When steering is operated
15%-18% less than battery voltage
• Adds motor speed to compensate for addition of steer requirement during
drive operation.
• Provides a minimum motor speed for steer requirement when only steer is
operated.
Pin 4 Wire 3
Enable signal
input
When joystick trigger pulled
5% less than battery voltage.
• Motor will not start without this input
• A signal here longer then 15 seconds without a signal on pin-2 or pin-3 will
result in a 2-flash code failure.
Pin 5 Wire 21
Speed cut-back
signal from
limit switch or
Lift circuit
Full speed: 24 V DC
Creep speed: 0 V DC.
• Speed cut-back is the elevated drive speed.