Kollmorgen Mounting
SERVO
STAR
®
SP3 Power Block
12
The following figure illustrates the use of multiple turns through a clamp-on core. The more
turns created, the more impedance is added to the line. Avoid putting the shield in a clamp-on
core. It is undesirable to place an impedance in-line with the shield. The use of ribbon cable may
be common in many cabinets. Some ferrite clamps are designed just for ribbon cable use as
shown below.
Flat cable clamp used with ribbon cable
GROUNDING
System grounding is essential for proper performance of the drive system. A ground bus bar is
used as a single point ground for the system. Safety grounding is provided to all pieces of the
system from a “star point”. A high frequency ground must also be provided that connects the
back panel to the enclosure, and ultimately to earth ground. This high frequency ground is made
with the use of a flat braid or copper bus bar. Do not use a standard wire for the high frequency
ground. 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. 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 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 suggested methods below:
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