3-10
Installing the Inverter
605 Series Frequency Inverter
EMC Motor Output Filter
This can help the Inverter achieve EMC and filter thermal conformance with cable lengths
greater than those specified. It 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 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 inverter 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:
•
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
internal/external ac supply EMC filter’s 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.
WARNING!
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)
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 Eurotherm Drives for the selection of a suitable line choke.
AC Motor Choke (output)
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.
Inverter kW
Inverter kW
Inverter kW
Inverter kW
Choke Inductance
Choke Inductance
Choke Inductance
Choke Inductance
RMS Current Rating
RMS Current Rating
RMS Current Rating
RMS Current Rating
Eurotherm Part No.
Eurotherm Part No.
Eurotherm Part No.
Eurotherm Part No.
0.75
2mH
7.5A
CO055931
1.5
2mH
7.5A
CO055931
2.2
0.9mH
22A
CO057283
3.7
0.9mH
22A
CO057283
Table 3-6 Recommended Choke Values for 220-240V Inverters
Note:
Motor chokes must be fitted for 380-460V units with screened cable runs in excess of
50m; limit the switching frequency to 3kHz in these applications. Refer to Chapter 6:
“Programming Your Application” - PATTERN GEN.
Содержание 605 Series
Страница 16: ...1 4 Getting Started 605 Series Frequency Inverter ...
Страница 22: ...2 6 An Overview of the Inverter 605 Series Frequency Inverter ...
Страница 34: ...3 12 Installing the Inverter 605 Series Frequency Inverter ...
Страница 48: ...4 14 Operating the Inverter 605 Series Frequency Inverter ...
Страница 156: ...8 2 Routine Maintenance and Repair 605 Series Frequency Inverter ...
Страница 198: ...12 12 Certification for the Inverter 605 Series Frequency Inverter ...
Страница 202: ...13 4 Application Notes 605 Series Frequency Inverter ...
Страница 204: ...14 2 Serial Communications 605 Series Frequency Inverter ...