6-6
SP600 AC Drive User Manual
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 / 600 VAC (500 KVA for 208 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%)
Fundamental Amp Rating
240 V 480 V 600 V
0.5 to 1 12.0 mH 4 2 2
2 to 3 6.5 mH 12 4 4
5 3.0 mH 18 8 8
7.5 2.5 mH 25 12 8
10 1.5 mH 35 18 12
15 1.2 mH - 25 18
20 0.8 mH - 35 25
25 0.8 mH - 35 -
30 0.7 mH - 45 -
40 0.5 mH - 55 -
50 0.4 mH - 80 -
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