When To Use Line Reactors (Input Chokes); When To Use Load Reactors (Output Chokes) - Siemens MICROMASTER 440 Quick Start Manual

2.7

When to Use Line Reactors (Input Chokes)

Line commutating chokes are used to smooth voltage peaks (line disturbances), or to bridge
commutating dips. In addition, line commutation chokes reduce the effects of harmonics on the drive,
and on the power supply.
If the short circuit capability of the line supply is >100 times larger than the nominal input current of the
drive then a line commutation reactor must be used. If the capability of the line supply is unknown
then a line commutating reactor should also be used.
Siemens offers a range of line reactors that are footprint-mountable up to Frame Size E (50HP CT,
460V), reducing enclosure space and offering a very neat solution.
2.8

When to Use Load Reactors (Output Chokes)

Load reactors should be used when motor cables exceed the following lengths:
For drives 0.16 – 100HP, 150 Feet (Shielded) 300 Feet (Unshielded)
For drives 125 – 300HP, 300 Feet (Shielded), 450 Feet (Unshielded).
Siemens offers a range of output chokes that are footprint-mountable up to Frame Size C (15HP CT,
460V), reducing enclosure space and offering a very neat solution.
The table below shows the shielded cable lengths that can be attained using the Siemens load
reactors. You can get approximately 50% more length if you use unshielded cable.
Frame
Size
A 6SE6400-3TC00-4AD3
A 6SE6400-3TC00-4AD2
B 6SE6400-3TC01-0BD3
C 6SE6400-3TC03-2CD3
C 6SE6400-3TC01-8CE3
For all other frame sizes, Siemens load reactors allow up to 600 feet with shielded cable or up to 900
feet with unshielded cable across the recommended voltage range.
MICROMASTER 440
6SE6400-5GA00-0BP0
Choke Part Number
Table 2-10 Cable lengths using Siemens Load Reactors
Quick Start Guide
200-240 380 – 400 401 – 480
± 10% ± 10 %
600 feet -
600 feet 450 feet 300 feet
600 feet 450 feet 300 feet
600 feet 600 feet 300 feet
- -
480 – 540
± 10 % ± 10 %
- -
-
-
-
- 300 feet
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