Installation manual

Wiring 08/04 Danaher Motion Kollmorgen
12 M-SS-001-01 Rev. T SERVOSTAR S Installation
4.2 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 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, wire has an inductance of 8 nH 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.
4.3 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 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, the power
input wire shielding has no affect. In the event that metallized
conduit is not implemented into the system, proper bonding
technologies and shielded cable are required on the power input
wires.
Expose the shield on the motor and feedback cables as close to the
drive as possible. The exposed shield is bonded to the back panel
using one of the two following methods.