Service Manual
Workman GTX Electric Lithium Page 3B -- 29 Electrical System
SC2: Traction Controller
The SC2: traction controller is secured to the seat base
rear panel (Fig. 28). The controller uses inputs from sev-
eral vehicle components to accurately control vehicle
speed, direction (forward and reverse) and regenerative
braking. Controller inputs include key switch, direction
selector switch (forward/reverse), accelerator pedal,
mode switch, traction motor thermistor (temperature),
traction motor encoder (speed sensor) and parking
brake. A single wire harness connection and five (5)
cables are used to connect the controller to the vehicle
electrical system. The traction controller is also connec-
ted to the CAN bus.
A fuse that is rated at 425 amperes continuous is at-
tached to the controller a nd protects the 48VDC vehicle
power supply circuit. If this fuse has failed, vehicle oper-
ation will not occur.
Cable connections for the controller are as follows:
Terminal B--: Negative (--) battery cable from the
left, rear battery
Terminal B+: Positive (+) cable from the main
contactor post
Terminal M1:Cable to traction motor terminal W
Terminal M2:Cable to traction motor terminal V
Terminal M3:Cable to traction motor terminal U
Because of the solid state circuitry built into the con-
troller, there is no method to test it directly (e.g. using a
multimeter). A LED exists on thecontrollertoidentify
normal operation or faults that will prevent the vehicle
from operating correctly. The display on the dash panel
converts the light pattern into the fault number informa-
tion and displays in the display. See chart below for light
pattern and fault codes identified by the controller LED
and the display.
NOTE: If the controller LED and status indicator light
are flashing, attempt to reset the controller by turning the
key switch to OFF, waiting several seconds and then
turning the switch to ON. If the controller LED and status
indicator light continue flashing after the reset attempt,
proceed with fault code identification and necessary ac-
tion.
Before removing any electrical connections from t he
controller, open the vehicle battery circuit by disconnect-
ing the conductors between the battery pack and vehicle
components (
see Opening Battery Circuit in the General
Information section of this chapter)
. When installing ca-
bles to controller, torque screws at all controller termi-
nals from 89 to 106 in--lb (10 to 12 N--m) (Fig. 29). Apply
Toro battery terminal protector (see Special Tools) to
controller connections after tightening terminal screws.
Refer to Controller in the Service and Repairs section of
this chapter for controller removal and installation infor-
mation.
1. SC2: Traction controller
Figure 28
1
Figure 29
UP
89 to 106 in--lb
(10 to 12 N--m)
1. Controller
2. Controller LED
3. B+ terminal (+ cable from main contactor)
4. B-- terminal (-- cable from left, rear battery)
5. Fuse (425 A)
6. M1 terminal (cable to motor terminal W)
7. M2 terminal (cable to motor terminal V)
8. M3 terminal (cable to motor terminal U)
3
1
4
8
2
7
6
5
Torque all
Terminal Screws
Electrical
System