Main Contactor (48 Vdc) - Toro Workman GTX Electric & Lithium Service Manual

Main Contactor (48 VDC)

The main contactor provides provides current to the 48
VDC system circuits (e.g. controller, traction motor) and
is energized by the controller when the key switch is ON.
The main contactor is mounted to the controller bracket
beneath the cargo bed (Fig. 29).
NOTE: If main contactor is faulty, a fault may be dis-
played at the status indicator light on dash and LED on
controller (see Controller in this section).
Testing
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less) that is due to the internal resistance of
the meter and test leads. Subtract this value from the
measured value of the component you are testing.
1. Park vehicle on a level surface, turn key switch to
OFF, engage the parking brake and remove key from
the key switch. Raise and support cargo bed to access
the main contactor.
2. Make sure that vehicle battery charger IS NOT con-
nected to electrical outlet. Open the battery circuit by
disconnecting the conductors between the battery pack
and vehicle components (see Opening Battery Circuit in
the General Information section of this chapter).
3. Locate main contactor. Disconnect all vehicle wire
harness connectors from contactor. Note wire connec-
tor locations on contactor for assembly purposes.
4. Using jumper wires, apply 48 VDC directly across the
contactor coil posts (Fig. 30). The contactor should click
as voltage is applied. With the contactor coil energized,
resistance across the main contact posts should be less
than 1 ohm.
5. Remove voltage from contactor coil posts. The con-
tactor should click as voltage is removed. With the con-
tactor coil not energized, resistance across the main
contact posts should be infinite ohms.
6. With voltage removed from contactor coil posts,
measure resistance across the coil posts (Fig. 30). The
resistance should be approximately 126 ohms.
7. Replace main contactor if testing determines that it
is faulty.
8. When contactor testing is completed, connect wire
harness connectors to contactor. Torque tighten the
nuts to 45 to 55 in- -lb (5 to 6.2 N- -m).
Workman GTX Electric
9. Connect the conductors between the battery pack
and vehicle components (see Opening Battery Circuit in
the General Information section of this chapter). Make
sure to torque hex nuts on battery terminals from 95 to
105 in- -lb (10.8 to 11.8 N- -m).
10.Lower and secure cargo bed.
6
1. Main contactor
2. Cable to controller B+
3. Positive battery cable
2
1
2
1
1. Main contact posts
Page 3A - - 21
FRONT
2
4
1
3
5
Figure 29
4. Wire harness connector
5. Wire harness connector
6. Traction motor
2
1
MAIN
CONTACTOR
WIRING
DIAGRAM
2
1
Figure 30
2. Contactor coil posts
Electrical System