"2047ES / 2647ES / 3247ES" Service & Parts Manual - CE Specifications
March 2008
Page 5-17
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
(W
IRE
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 cutback
signal from
limit switch or
Lift circuit
Full speed:
24 V DC
Creep speed:
0 V DC
.
• Speed cutback is the elevated drive speed.
