Specifications

22
8.0 INPUT AC REQUIREMENTS
8.1 INPUT AC POWER REQUIREMENTS
8.1.1 VOLTAGE:
The input voltage must match the drive’s nameplate voltage rating. Voltage fluctuation must
not vary by greater than 10% overvoltage or 15% undervoltage.
The drive is suitable for use on a circuit capable of delivering not more than 200,000 RMS
symmetrical amperes, at the drive’s rated voltage.
Three phase voltage imbalance must be less than 2.0% phase to phase. Excessive phase to
phase imbalance can cause severe damage to the drive’s power components.
Motor voltage should match line voltage in normal applications. The drive’s maximum
output voltage will equal the input voltage. Use extreme caution when using a motor with a
voltage rating which is different from the input line voltage.
8.1.2 kVA RATINGS:
If the kVA rating of the AC supply transformer is greater than ten times the input kVA rating
of the drive, a drive isolation transformer, or a 2 - 3% input line reactor (also known as a
choke) must be added.
8.2 INPUT FUSING AND DISCONNECT REQUIREMENTS
A circuit breaker or a disconnect switch with fuses must be provided in accordance with the
National Electric Code (NEC) and all local codes.
The AC400 drive is capable of withstanding up to 150% current overload for 60 seconds.
Select a fuse or magnetic trip circuit breaker rated at 1.5 times the input current rating of the
drive (the minimum fuse size should be 10 amps, regardless of input current rating). Refer
to Section 5.0 (AC400 RATINGS).
Warning
Hazard of electrical shock! Disconnect incoming power and wait three minutes
before servicing the drive. Capacitors retain charge after power is removed.

NOTE
Drives with dual rated input voltage must be programmed for the proper supply voltage -
see Parameter 0 (LINE VOLTS) in Section 18.0 (DESCRIPTION OF PARAMETERS).