ELECTRICAL SYSTEM 10
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10.6 OLM CONTROLLER LIGHTS (EARLY UNITS) ___________________________________
The OLM controller is a solid state device that monitors and
controls resistor functions. The controller communicates
with the MCU controller via the CAN network.
Each input and output signal is displayed through lamps
located on front face of the controller. A closed input switch
indicates an active circuit and will turn an input lamp on, an
open switch an inactive circuit and will turn a lamp off.
Outputs are active when their lights are on.
Figure 10D
10.7 PDU (EARLY UNITS) _______________________________________________________
The PDU is located to the left of the operator seat, under
the MCU, and is used to switch 48V and 12V motor/
controller outputs on or off. Three circuit breakers are
located on the rear of the PDU.
Before working on, or opening the PDU, shut mower off,
remove key, disconnect 48 volt battery connector, and
disconnect 12 volt battery connector (Hybrid mowers).
Use caution to prevent shorting between PDU input,
output, and ground cable studs.
Inside the PDU are the following components:
Traction Contactor - Used to control 48 volt power
output to TCU and OLM.
48 Volt Contactor - Used to control 48 volt power
output to MCU, RCU, SCU, and other components.
12 Volt Contactor - Used to control 12 volt power
output to MCU, 12 volt lights, and engine
components.
150 Amp Fuse - Used to provide circuit protection
for 48 volt contactor.
300 Amp Fuse - Used to provide circuit protection
for traction contactor.
12 Amp Circuit Breaker - Used to provide circuit
protect for 48 volt contactor output except for RCU
and SCU.
30 Amp Circuit Breaker - Used to provide circuit
protection for SCU.
50 Amp Circuit Breaker - Used to provide circuit
protection for 12 volt contactor.
Printed Circuit Board - Used for controlling PDU
inputs and outputs.
Glow Plug Relay - Used to control glow plug
operation for Diesel hybrid engines.
Start Relay - Used to control starter motor operation
for Gas and Diesel hybrid engines.
Figure 10E
RESIST
OR
2
4
1
3
PWR
C
OM
Controller Functions by Lamp Number
Lamp On - Circuit is active
Lamp Off - Circuit is inactive
INPUTS
OUTPUTS
Lamp
Circuit
Lamp
Circuit
PWR
+48 Volt DC Power In
1
Resistor #1
COM
CAN Network
2
Resistor #2
3
Resistor #3
4
Resistor #4
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