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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.
NOTE: Drives with dual rated input voltage must be programmed for the proper
supply voltage. Refer to Parameter 0 - LINE VOLTS in Section 18.0 -
DESCRIPTION OF PARAMETERS.
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 MC1000 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 - MC1000 RATINGS.
WARNING!
Hazard of electrical shock! Disconnect incoming power and wait three minutes
before servicing the drive. Capacitors retain charge after power is removed.
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