
Geo Direct PWM Amplifier
Connector PinOuts and Wiring 19
AC input wires must be twisted together to eliminate as much noise
radiation as possible.
Recommended Main Bus Power Wiring/Protection
Main bus power lines should run in a separate duct (at least 12” or 30
cm away) from and should never be bundled with the I/O signal,
communication, or encoder cables.
Grounding, Bonding
System grounding is crucial for proper performance of the Geo Direct PWM Drive. Panel wiring requires
that a central earth-ground (also known as ground bus bar) location be installed at one part of the panel.
The ground bus bar is usually a copper plate directly bonded to the back panel. This electrical ground
connection allows for each device within the enclosure to have a separate wire brought back to the central
earth-ground.
Motor shields are best grounded at both ends of the cable. Motor cable shields should be
bonded to the back panel using 360-degree clamps at the point they enter or exit the panel.
Always use metal shells.
Implement a star point ground connection scheme; so that each device wired to earth ground
has its own conductor brought directly back to the central earth ground plate (bus bar).
Use an unpainted back panel. This allows a wide area of contact for all metallic surfaces,
reducing frequency impedances.
Use a heavy gauge ground earth conductors made up of many strands of fine conducts.
The Geo Direct PWM Drive is brought to the earth-ground via one or two wire(s) connected
to the M4 mounting stud(s) through a heavy gauge multi-strand conductor to the central
earth-ground.
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