ELECTRICAL SYSTEM 10
en-75
10
ELECTRICAL SYSTEM
10.1 GENERAL INFORMATION ___________________________________________________
General precautions that can be taken to reduce
electrical problems are listed below.
1.
Make certain all terminals and connections are clean
and properly secured.
2.
Check the interlock system, fuses, and circuit
breakers regularly.
If the interlock does not function properly and the
problem cannot be corrected, contact an authorized
Jacobsen Dealer.
3.
Keep the wire harness and all individual wires away
from moving parts to prevent damage.
4.
Make sure the seat switch harness is connected to
the main wire harness.
5.
Check the battery and battery charging circuit.
6.
Do not wash or pressure spray around electrical
connections and components.
The electrical system is monitored and controlled by the
multiple controllers. The controllers are equipped with
LED’s which can be used when troubleshooting the
electrical system.
10.2 CONTROLLERS ___________________________________________________________
CAUTION
Always turn the system power switch off, remove key,
and disconnect battery connector(s), before
inspecting or working on the electrical system.
!
Controller
Location/Function
Traction Controller
(TCU)
Located to the right of the operator seat, under the right cowling. Traction controller is
used to control the operation of the traction drive motor. The traction controller has
one green light for diagnostics.
Steering Controller
(SCU)
Located at the rear of the unit below the hood. Steering controller is used to control
the power steering system. The steering controller has one green light for
diagnostics.
Main Controller Unit
(MCU)
Located to the left of the operator seat, under the left cowling. MCU is used to control
communications between the different controllers. The MCU has diagnostic lights to
help troubleshoot controller functions. See Section 10.5.
Reel Controller Unit
(RCU)
Located on the right side of the steering column, under the steering column cover.
RCU is used to control the operation of the reel motors and the lift/lower actuators.
The RCU has diagnostic lights to help troubleshoot controller functions. See Section
10.4.
LCD Display Unit
(LDU)
Located on the instrument panel. Used to display and set functions. See Section 4.5.
Over-Voltage Limit Module
Controller (OLM)
(Early Units) Located under the operator’s seat. OLM controller is used to cycle the
over-voltage resistors on the side of the machine. See Section 10.6.
Braking Resistor Controller
(BRC)
(Later Units) Located on side of TCU. BRC controller is used to energize the four
over-voltage resistors on the side of the machine.
Power Distribution Unit
(PDU)
Located to the left of the operator seat, under the MCU. PDU is used to switch 48V
and 12V motor/controller outputs on or off. Three circuit breakers are located on the
rear of the PDU.
Genset Controller (APU)
(Hybrid Powered Mowers only)
Located on the engine side of the fuel tank. Used to control engine speed and
generator functions.
3WD Controller
(3WD)
Located at the rear of the unit below the hood. 3WD controller is used to control the
rear wheel motor. The 3WD controller has one green light for diagnostics.
