Rockwell Automation Reliance electric 6SB401 Series, User Manual, Page: 69 / 274

Installing Power Wiring
6-3
6.3 Installing Input Wiring
Sections 6.3.1 to 6.3.4 describe incoming line components and how
to install them.
6.3.1 Installing an Optional Transformer and Reactor
Input isolation transformers might be needed to help eliminate:
•
Damaging AC line voltage transients from reaching the drive.
•
Line noise from the drive back to the incoming power source.
•
Damaging currents that could develop if a point inside the drive
becomes grounded.
Observe these guidelines when installing an isolation transformer:
•
A power disconnecting device must be installed between the
power line and the primary of the transformer.
•
If the user-installed power disconnecting device is a circuit
breaker, the circuit breaker trip rating must be coordinated with
the in-rush current (10 to 12 times full load current) of the
transformer.
•
Do not use an input isolation transformer rated more than
1000 KVA for 480 VAC with less than 5% impedance directly
ahead of the drive without additional impedance between the
drive and the transformer.
Table 6.2 shows recommended inductance and line reactor ratings.
Table 6.2 – AC Line Reactors
Drive (HP) Line Reactor Inductance (±10%) Reactor Rating (kVAr)
20 0.8 mH 1.04
25 0.8 mH 1.04
30 0.7 mH 1.04
40 0.5 mH 1.43
50 0.4 mH 1.90
60 0.4 mH 1.90
75 0.3 mH 2.76
100 0.2 mH 2.76
125 0.12 mH 2.76
150 0.11 mH not available
200 0.09 mH not available
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