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These can help the 584SV Inverter achieve EMC and filter thermal conformance with cable
lengths greater than those specified. They also ensure 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 Eurotherm Drives for the selection of suitable filters.
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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 Inverter can be inhibited before closing or opening
this contactor.
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We do not recommend the use of circuit breakers (e.g. RCD, ELCB, GFCI), but where their use
is mandatory, they should:
•
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.
When the ac supply is switched on, a pulse of current flows to earth to charge the EMC filter
internal capacitors which are connected between phase and earth. This has been minimised in
Eurotherm 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.
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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 Eurotherm Drives for the selection of a suitable line choke.
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Installations with longer than specified motor cable runs may suffer from nuisance overcurrent
trips, refer to Chapter 11: “Technical Specifications” - Cabling Requirements for maximum cable
lengths. A choke may be fitted in the Inverter output to limit capacitive current. Screened cable
has a higher capacitance and may cause problems in shorter runs. The recommended choke
values are shown in the tables below.
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Table 3-7 Recommended Choke Values for 220-240V 584SV Units
Summary of Contents for 584SV Series
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