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3 INSTALLATION
Install the chopper with the base-plate on a flat metallic surface that is clean and unpainted.
Apply a light layer of thermo-conductive grease between the two surfaces to permit better
heat dissipation.
Ensure that the wiring of the cable terminals and connectors is carried out correctly.
Fit transient suppression devices to the horn, solenoid valves, and contactors not con-
nected to the chopper such as those for activating the pump motor or steering motor.
3.1 CONNECTION CABLES
For the auxiliary circuits, use cables of 0.5mm² section.
For power connections to the motor and to the battery, use cables having section in the
35÷50 mm² range (as a minimum).
For the optimum inverter performance, the cables to the battery should be run side by side
and be as short as possible.
3.2 CONTACTORS
The main contactor must be installed. Depending on the position of a jumper installed in
the logic board:
- the output which drives the main contactor coil is on/off (the coil is driven with the full
battery voltage).
- the output which drives the main contactor coil is switched at high frequency (1 KHz)
with a duty cicle of 70%; this feature is useful to decrease the power dissipation of the
contactor coil.
3.3 FUSES
- Use a 6.3A Fuse for protection of the auxiliary circuits.
- For protection of the power unit, refer to diagrams.. The Fuse value shown is the maxi-
mum allowable. For special applications or requirements these values can be reduced.
- For Safety reasons, we recommend the use of protected fuses in order to prevent the
spread of fused particles should the fuse blow.
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