Installation manual

Danaher Motion Kollmorgen Wiring
SERVOSTAR
®
S and SERVOSTAR
®
CD Series 13
Grounding
System grounding is essential for proper performance of the drive system. A
ground bus bar may be used as a single point ground for the system. Safety
grounding should be provided to all pieces of the system from a “star point." In
addition to the safety grounding, a high frequency ground must be provided that
connects the back panel to the enclosure and, ultimately, to earth ground. The
objective is to provide an extremely low impedance path between the filters,
drives, power supplies, and earth ground. This high frequency ground is
accomplished with the use of a flat braid or copper bus bar. It is important not to
rely on a standard wire for the high frequency ground. In general, a wire has an
inductance of 8nH-per-inch, regardless of diameter. At higher frequencies, this
unwanted inductance between grounds equates to limited filter performance.
When connecting high frequency grounds, use the shortest braid possible.
Bonding
The proper bonding of shielded cables is imperative for minimizing noise
emissions and increasing immunity levels of the drive system. Its effect is to
reduce the impedance between the cable shield and the back panel. Danaher
Motion Kollmorgen recommends that all shielded cables be bonded to the back
panel.
Power input wiring does not require shielding (screening) if the power is fed to
the cabinet (enclosure) via metallized conduit. If the metallized conduit is used
with proper high frequency grounds, bonding technology, and recommended
wire routing, then power input wire shielding has no affect. In the event that
metallized conduit is not implemented into the system, shielded cable is required
on the power input wires and proper bonding technologies should be
implemented.
The motor and feedback cables should have the shield exposed as close to the
drive as possible. This exposed shield is bonded to the back panel using one of
the two following methods.