Emc Motor Output Filter; Output Contactors; Earth Fault Monitoring Systems; Line Chokes (Input) - Parker 650G Product Manual

EMC Motor Output Filter

This can help the drive achieve EMC and filter thermal conformance. It also ensures longer
motor life by reducing the high voltage slew rate and overvoltage stresses. Mount the filter as
close to the VSD as possible. Please refer to Parker SSD Drives for the selection of a suitable
filter.

Output Contactors

Output contactors can be used, although we recommend that this type of operation is limited to
emergency use only, or in a system where the drive can be inhibited before closing or opening
this contactor.

Earth Fault Monitoring Systems

We do not recommend the use of circuit breakers (e.g. RCD, ELCB, GFCI), but where their use
is mandatory, they should:


When the ac supply is switched on, a pulse of current flows to earth to charge the
internal/external ac supply EMC filter's internal capacitors which are connected between phase
and earth. This has been minimised in Parker SSD Drives' filters, but may still trip out any
circuit breaker in the earth system. In addition, high frequency and dc components of earth
leakage currents will flow under normal operating conditions. Under certain fault conditions
larger dc protective earth currents may flow. The protective function of some circuit breakers
cannot be guaranteed under such operating conditions.

Line Chokes (input)

Line chokes may be used to reduce the harmonic content of the supply current where this a
particular requirement of the application or where greater protection from mains borne transients
is required. Please refer to Parker SSD Drives for the selection of a suitable line choke for
Frames C and D.

AC Motor Choke (output)

Installations with long cable runs may suffer from nuisance overcurrent trips, refer to Chapter 9:
"Technical Specifications" - Cabling Requirements for maximum cable lengths. A choke may be
fitted in the drive output to limit capacitive current. Screened cable has a higher capacitance and
may cause problems in shorter runs. Contact Parker SSD Drives for recommended choke values.
650G AC Drive
Operate correctly with dc and ac protective earth currents (i.e. type B RCDs as in
Amendment 2 of IEC755).
Have adjustable trip amplitude and time characteristics to prevent nuisance tripping on
switch-on.
Circuit breakers used with VSDs and other similar equipment are not suitable for
personnel protection. Use another means to provide personal safety. Refer to
EN50178 (1997) / VDE0160 (1994) / EN60204-1 (1994)
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Installing the Drive
WARNING!
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