Sc1: Lithium--Ion Battery Controller - Toro Workman GTX Electric & Lithium Service Manual

SC1: Lithium- -Ion Battery Controller (BMS)
The machine uses a Lithium–ion battery controller or
Battery Management System (BMS) to manage the lithi-
um--ion batteries. Each of the eight lithium--ion batteries
communicates with the BMS through a sub--net via the
battery interface harness. The battery interface harness
includes a 4--pin connector at each of the batteries and
a 9--pin connector at the BMS. The BMS uses the
sub–net to verify the presence and condition of each of
the batteries before allowing battery power to the ma-
chine. The BMS is also connected to the CAN bus which
allows it to forward battery information to the rest of the
machine. The BMS is located under the seat attached
to the seat base rear panel.
Note: If the SC1: Lithium--Ion Battery Controller is re-
placed for any reason, the machine software must be
updated; contact an Authorized Toro Distributor for as-
sistance.
Testing the SC1: Lithium- -Ion Battery Controller
Although there is no method to test the solid state cir-
cuitry built into the controller directly, some aspects of
the lithium--ion battery controller operation can be
tested as follows; refer to Fig 26.
1. With he batteries connected to the BMS, the battery
pack voltage can be tested across the BMS B+ and B--
terminals.
2. With he batteries connected to the BMS, signal
voltage from the BMS to the key switch can be tested at
the controller wire harness connector P12 pin 6 and the
BMS B-- terminal.
3. An audible "Click" should come from the BMS shortly
after the key switch is set to the ON position. The "Click"
sound indicates the contactor inside the BMS has
closed and battery power should be available to the ma-
chine.
4. Once the BMS internal contactor has closed, battery
pack voltage can be tested across the BMS positive (+)
and negative (–) terminals.
5. If CAN bus communication with the controller is sus-
pect, the CAN bus wiring should be checked for corro-
sion or damage and cleaned or repaired as necessary.
The lithium--ion battery controller CAN bus transceiver
can also be tested if necessary using the controller wire
harness connector P12 pins 3 and 4, the normal resist-
ance must be 50k to 55k ohms.
Electrical System
1. SC1: Lithium- -ion battery
controller
1. Lithium- -Ion battery con-
troller
2. Positive (+) terminal
3. B+ terminal
Page 3B - - 28
1
Figure 25
1 2 3 4
P12
8 7 6 5
Figure 26
1
2
3
4
7
5
6
Figure 27
4. M- -S terminal
5. B- - terminal
6. Negative (- -) terminal
7. COM terminal
Workman GTX Electric Lithium