Working on electrical systems is potentially dangerous; you should
protect yourself against :
Uncontrolled operation: some conditions could cause the motor to run
out of control: disconnect the motor or jack up the vehicle and get the
drive wheels off the ground before attempting any work on the motor
control circuitry.
Voltage hazard and high current arcs: batteries can supply high
voltage and very high power, and arcs can occur if they are short
circuited. Always disconnect the battery circuit before working on the
motor control circuit.
Wear safety glasses and use properly insulated tools to prevent shorts.
Lead acid batteries: charging or discharging generates hydrogen gas,
which can build up and go around the batteries. Follow the battery
manufacturer’s safety recommendations and wear safety glasses.
3.3 Cooling requirements
3.3.1 AC-M1 with Heat Sink
A massive heat sink comprising the entire bottom surface of the AC-M1 transfers heat out
of the power conversion section to the surrounding air.
Drives operating at or near continuous power output require forced air cooling to maintain
heat sink temperature in the safe operating zone.
We recommend ambient temperature air to be directed over the heat sink fins to maintain
heat sink temperature below 85 °C.
Either an axial blower or two small muffin fans can provide the necessary airflow.
3.3.2 AC-M1 with Aluminium Baseplate
A massive heat sink comprising the entire bottom surface of the AC-M1 transfers heat out
of the power conversion section to the vehicle body.
Drives operating at or near their continuous power output require different thermal
resistance depending on AC-M1 size for dissipation of heat to maintain heat sink
temperature in the safe operating zone.
In this case, AC-M1 is cooled by the surface contact to the vehicle body, so it is important
to pay much attention to the flatness and the roughness of the surface of the vehicle frame
where AC-M1 is mounted.
Apply thermal grease to the AC-M1 before mounting for better cooling effect.
You should keep the planarity of the surface under 0.5mm, as shown in Figure 2.
3.3.3 Clearances
For all AC-M1 models 50 mm clearances in front of and behind the AC-M1 are required for
airflow; 50 mm clearance above the AC-M1 is required for installation/removal of interface
connectors and wiring. Refer to figures 1 on pages 9 for the dimensions of AC-M1.
PRELIMINARY VERSION 12
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