Nilfisk-Advance CS7000 Fuel Cell EcoFlex, Service Manual

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Steering System 360 Service Manual – CS7000
The steering controller controls a safety relay (K14) to shut down the drive wheel system in the event that
there is a serious steering system error. The relay coil receives battery voltage from the key switch (The
same as J5-1). The voltage flows through the relay coil and on to the controller J5-18. Inside the controller
there is a “switch” that closes to battery negative to energize the relay. The relay contacts close allowing
battery voltage to the drive controller interlock switch circuit J4-9. In the event of a serious steering system
error, the steering controller opens its internal switch to de-energize the safety relay coil. This causes the
relay contacts to open and removes the power supply from the drive motor controller. This shuts down the
drive wheel system.
The steering controller can communicate with other devices via a “CAN bus”. The CAN bus wires are at J5-
23, J5-15 and J5-8.
The steering actuator motor has 3 “stator” windings that are interconnected. These wires are the “working
wires” of the motor. The controller supplies AC voltage and current to these winding to create a magnetic
field that will act upon the rotor magnetic field and apply torque to spin the rotor. The controller is capable
of switching the current to the windings on and off in specific order to make the motor turn either clockwise
or counterclockwise and control the speed of the motor. The motor windings are wired directly to the bolt on
lugs of the steering controller. They are clearly marked “U”, “V” and “W”.
87a
86
85
87
30
B-
Steering Controller
Drive Controller
Key Switch
Seat Switch
Emergency
Stop
Switch
Battery
Interlock
Switch
J5 - 18
Interlock J4-9
K14
Safety
Relay