ACX1_TAU_SYNC_UserManual_En
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6. EMC suggestions
6.1 General overview on EMC
Electromagnetic compatibility (EMC) encompasses two areas: emissions, i.e. the ability to work
without causing electromagnetic disturbances to the nearing devices, and immunity, i.e. the ability
to work in the presence of RF energy.
6.2 EM emissions
Signals with high frequency content can produce significant emissions if connected to a large
enough radiating area (created by long wires spaced far apart). Also the contactor and motor
drivers can emit significant disturbances, because their outputs are pulse width modulated square
waves that are rich in harmonics (however, if a contactor supply is not modulated, its emission will
be zero). The best way to minimize this kind of emission is to make as short as possible and place,
if possible, each current near its return.
Controller:
• A good solution is to put the controller, wires, motors and the contactor in a shielded box,
especially if very low emissions are required.
• For best noise immunity, the cables should not run across the section of the controller.
Battery:
• These two cables should be run close to each other between the Controller and the battery.
• With multiple high current controllers, use a star ground from the battery B- terminal.
Motor:
• The three phase wires should be close to the same length and bundled together as they
run between the controller and the motor.
• In applications that seek the lowest possible emissions, a shield can be placed around the
bundled motor cables and connected to the B- terminal at the controller. Typical
installations will readily pass the emissions standards without a shield.
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