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SEM1
2.6 CONTROLLER’S DIAGNOSTICS
The microprocessor carries out the diagnostics of the main operating functions of the
controller.
The diagnostics is organised in four main stages:
1) Check at the start-up (key on) includes: watch-dog test, current sensor test, VMN
test, driver of the line contactor’s coil test, test of the running request, test high
accelerator input.
2) Check while stand-by includes: watch-dog test, current sensor test, VMN test, driver
of the line contactor’s coil test.
3) Check while running includes: watch-dog test, current sensor test, VMN test, driver
of the line contactor’s coil test, VMN full conduction test.
4) Continuous check: temperature test, battery state of charge test.
The diagnostics message can be read through the number of periodic flashes of the
alarm LED fitted or simply connected to the B connector.
By means of the programming console is possible to display the alarm message rela-
tive to the current and already occurred alarms.
2.7 THERMAL PRECAUTIONS
- The heat generated by the controller must be dissipated. The housing of the
controller and the cooling surfaces must be wide enough to allow the necessary
dissipation.
- The cooling system must be sized depending on the performances requested. In
some cases of poor ventilation, where the heat exchange is difficult because of the
materials, a forced ventilation is advisable.
- The power dissipated by the controller is a function of the current and the working
cycle.
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