TTF Limo-GT, Service Work Instructions

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Electric system: Controller thermal issues
Background
The controller’s safe operating
temperature is -25°C to +85°C. During
driving (mainly accelerating and motor
braking) the controller heats up.
Whenever driving in warm climates there
is a chance that the controller temperature
will rise above +85°C. When it does, the
controller will give an error and max speed
will be reduced.
It is best to stop driving and let the
controller cool down.
If the C_hot error occurs regularly, there
might be another problem:
1. Dirt
The controller and heat sink need to be cleaned of dirt.
2. Terminals
These terminals need to be secured properly.
3. Heat sink alignment
- Underneath the heat sink are screws that can be tightened.
- The bolts, securing the controller, can be tightened.
- The cooling paste can be removed and applied
(see slide: ‘controller - hardware
replacement procedure’).
4. Wheels
Lift the vehicle to check if the wheels can turn freely ( see slides regarding rear
suspension, axle and differential).
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