SSD 605C Product Manual - Using Output Contactors

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