Mec 2033ES - Page 72

October 2008 "2033ES / 2633ES" Service & Parts Manual - ANSI Specifications
Page 4-18
FUNCTION VOLTAGE READING
Sevcon Motor Speed Controller - Connections (continued)
PIN 6 – WIRE 16
Motor Start
Relay ground
signal
Idle: 24 V DC
When function requested: 0 V DC.
• This is how the Controller maintains control over the motor circuit.
• Sevcon controls the Motor Start Relay function ground signal.
• Will not operate the motor start relay when 2, 3, 4 & 7 flash codes occur.
PIN 7 – WIRE 41
Ground signal
to Lift solenoid
valve
0 volts
No ground presence until lift is requested.
• By providing the ground signal, lift function can be prevented anytime
battery voltage falls below 18 volts. This will result in a 9 flash code.
PIN 9 – WIRE 14
Accelerator
reference
signal to the
potentiometer
(upper control
box)
From 3.5 V DC with joystick in the neutral to 0 V DC at full stroke.
• Controller uses this circuit to monitor joystick input after pins 2 & 4
energize.
• Controls motor speed in reference to the voltage on this circuit.
• Voltages above 4.0 V DC or below 3.0 V DC will result in a 6 flash code.
POST B+
Battery positive
cable from 200
amp fuse
Full battery voltage.
• No real diagnostic value.
POST B–
Battery positive
cable from 200
amp fuse
Battery ground cable connection
Ground path for motor operation
• All system ground wires (wire #s 15 & 15A) terminate here.
• Best place to connect ground lead from multi-meter while troubleshooting.
POST M-2
PWM
controlled
motor ground
Idle: 12 V DC – 13 V DC
During operation, between 5 V DC & 24 V DC.
• 12 – 13 volts is reference voltage used by the controller to monitor motor
circuit irregularities at idle.
• 0 volts at idle = 3 flash code
• Above 20 volts at idle = 4 flash code
• No voltage change after Motor Start Relay signal = 5 flash code.