Overview of a truck drive system
Each traction or pump application requires a number of system components. The main
components (excluding control inputs such as throttle and seat switch) are shown in Figure 3. In
this example there are two controllers, a traction motor and a hydraulic pump, however all the
main components would be the same if controller 2 was also powering a traction motor.
Communication between the controllers is achieved using the CANopen protocol. This protocol
also allows Gen4 to communicate with other non-Sevcon, CANopen compliant devices.
Figure 3 Truck system components
Signal power for the internal control circuits and software is derived from the battery via the
control fuse and key switch as shown. No external in-rush current limiting is needed as long as
Gen4 is used to control the line contactor and hence the timing of its closure. The software
controls the start up sequence in this order:
1. Charge the input capacitors to within a user definable percentage (using 5820
h
) of battery
voltage (via the key switch signal line).
2. Close line contactor.
3. Generate output to the motor as demanded.
A line input fuse can be mounted on the body of the controller. The ‘B+’ terminal is a dummy
terminal. If the fuse is mounted elsewhere, connections from the battery positive are made to the
controller ‘+’ terminal see “On-board fuse mounting” section.
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