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Danaher Motion
INSTALLATION PRACTICES
The environment that any electronic control system 'lives' in can effect its operation. Kollmorgen
recommends that the SERVOSTAR system be operated and stored under the environmental conditions
stated in the product specification tables. The system may be operated in higher temperature ambient
conditions with a derating applied. Please check with the factory for derating information.
Attention to proper installation and field wiring are of prime importance to ensure long-term and trouble-
free operation. Users should familiarize themselves with and follow the installation and wiring
instructions listed in this chapter. In addition to these practices, some localities and industries may require
applicable electrical and safety codes, laws, and standards.
Enclosure
The Kollmorgen SERVOSTAR series of electronic system components are designed for panel assembly.
This panel assembly should then be mounted in a metallic enclosure. Enclosures are supplied by the
manufacturers of the final product and must meet the environmental IP rating of the end product. To
ensure proper grounding (and to optimize EMC), the enclosure should have continuous ground continuity
maintained between all metal panels. This ground continuity is intended to be both a safety ground and a
high frequency ground. The units should be mounted on a back plane, which is installed into the
enclosure. Ideally, the back plane should be an unpainted metallic surface to optimize electrical bonding
of the frame and provide the lowest possible impedance path to earth ground. These enclosures also
provide added safety.
Wiring Practices
Particular care should be used when layout of an enclosure is designed. Efforts to separate power wires
from small signal wires should be taken. The following guidelines highlight some important wiring
practices to implement:
•
Control and signal cables must be separated from power and motor cables. A distance of 20cm
(8in) is sufficient in most cases.
•
Control and signal cables must be shielded to reduce the effects of radiated interference.
•
Where control cables must cross power or motor cables, they should be done with an angle of 90
degrees if possible to reduce the field coupling effect.
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 can be 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/in
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.
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SERVOSTAR
SBD-Series ST/CT Product Family
Hardware Installation
21
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