Nord Drivesystems SK 510P, Руководство с инструкциями по установке

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2 Assembly and installation
BU 0600 en-3221 35
2.4 Chokes
Frequency inverters cause loads both on the mains side and the motor side (e.g. current harmonics,
steep flanks, EMC interference), which may result in malfunctions in system operation and in the
frequency inverter. Mains or link circuit chokes are primarily used for protection of the mains, motor
chokes primarily reduce influences on the motor side.
2.4.1 Mains chokes
Mains chokes are available for protection on the mains side. These are incorporated in the supply
cable immediately in front of the inverter.
Mains input chokes reduce the charging current and harmonics from the mains. Chokes fulfil several
functions:
• Reduction of harmonics in the mains voltage upstream of the choke
• Reduction of the negative effects of mains voltage asymmetries
• Increase of efficiency due to lower input current
• Increase of the service life of link circuit capacitors
Use of mains chokes is recommended e.g.:
• If the proportion of the installed inverter power exceeds 20 % of the installed transformer power.
• For very hard mains or capacitive compensation systems
• In case of large voltage fluctuations due to switching
2.4.1.1 Mains choke SK CI5
Type SK CI5- chokes are intended for a
maximum supply voltage of 230 V or 500 V at
50/60 Hz.
All chokes have a protection class
corresponding to IP00. The choke which is
used must therefore be installed in a control
cabinet.
Single phase/ 400 V 3-phase/ 400 V
Mains choke SK CI5-230/xxx
Inverter ID
SK 5xxP
Mains choke
Type Part number Data sheet
1~
230
V
0.25 ... 0.37 kW
SK CI5-230/006-C 276 993 005
TI 276993xxx
0.55 ... 0.75 kW SK CI5-230/010-C 276 993 009
1.1 ... 2.2 kW SK CI5-230/025-C 276 993 024