Controller - Toro Workman GTX Electric & Lithium Service Manual

Controller

The Workman controller is secured to the rear frame be-
neath the cargo box (Fig. 36). The controller uses inputs
from several vehicle components to accurately control
vehicle speed, direction (forward and reverse) and re-
generative braking. Controller inputs include key switch,
direction selector switch (forward/reverse), accelerator
pedal, supervision speed limit switch, traction motor
thermistor (temperature), traction motor encoder
(speed sensor) and battery charger lockout. A single
wire harness connection and five (5) cables are used to
connect the controller to the vehicle electrical system.
A fuse that is rated at 425 amperes continuous is at-
tached to the controller and protects the 48VDC vehicle
power supply circuit. If this fuse has failed, vehicle op-
eration 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 the controller to identify
normal operation or faults that will prevent the vehicle
from operating correctly. The status indicator light on the
dash panel should display the same information as the
LED on the controller. See chart below for light pattern
fault codes identified by the controller LED and status in-
dicator light.
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 the
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. 37). 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.
Electrical System
1
3
2
1. Controller
2. Controller LED
8
2
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)
Page 3A - - 26
Figure 36
3. Wire harness connector
3
1
5
7
4
Torque all
Terminal Screws
89 to 106 in- -lb
6
(10 to 12 N- -m)
Figure 37
Workman GTX Electric
UP