Data Sheet

FDC3260 Motor Controller Datasheet 5

Use of Safety Contactor for Critical Applications

Note 5: Connect the controller’s bottom plate to a wire connected to the Earth while the charger is plugged in the

AC main, or if the controller is powered by an AC power supply.

Note 6: Beware not to create a path from the ground pins on the I/O connector and the battery minus terminal.

Use of Safety Contactor for Critical Applications

An external safety contactor must be used in any application where damage to property or injury to person can

occur because of uncontrolled motor operation resulting from failure in the controller’s power output stage.

The contactor coil must be connected to a digital output configured to activate when “No MOSFET Failure”. The

controller will automatically deactivate the coil if the output is expected to be off and battery current of 1A or

more is measured for more than 0.5s. This circuit will not protect against other sources of failure such as those

described in the “Important Safety Disclaimer” on page 3.

Controller Mounting

During motor operation, the controller will generate heat that must be evacuated. The published amps rating can

only be fully achieved if adequate cooling is provided. Good conduction cooling can be achieved by having the bot-

tom edges of the case making contact with a metallic surface (chassis, cabinet).

PwrCtrl

SW1 Main

On/Off Switch 1A

Diode

>20A

Resistor

1K, 0.5W

I/O Connector

VMot

to +40V Max

Digital Out

Ground

Main

Battery

FIGURE 4. Contactor wiring diagram