13-2 Application Notes
605C Frequency Inverter
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.
Using Output Contactors
The use of output contactors is permitted. It is recommended that this type of operation be
limited to emergency use only or in a system where the drive can be inhibited before closing or
opening this contactor.
Using Motor Chokes
Installations with motor cable runs in excess of 50m may suffer from nuisance overcurrent trips.
This is due to the capacitance of the cable causing current spikes to be drawn from the Inverter
output. A choke may be fitted in the Inverter output which limits the capacitive current.
Screened cable has a higher capacitance and may cause problems in shorter runs. The
recommended choke values are shown in Table A.1.
Motor
Power
(kW)
Choke Inductance RMS Current Rating SSD Drives Part No.
0.75
1.1
1.5 2mH 7.5A CO055931
2.2
4.0
5.5 0.9mH 22A CO057283
7.5
11 0.45mH 33A CO057284
15
18 0.3mH 44A CO057285
22 50uH 70A CO055193
30
37 50uH 99A CO055253
45 50uH 99A CO055253
55 25uH 120A -
75 25uH 160A -
90 25uH 200A -
Table 13-1 Recommended Choke Values for Cables up to 300 Metres
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