LEESON Micro Series Compact Inverters - Manual (Page 26)

8.0 INPUT AC REQUIREMENTS
Hazard of electrical shock. Disconnect incoming power and wait three minutes before servicing
the drive . Capacitors retain charge after power is removed .
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 - see
Parameter 0 - LINE VOLTS in Section 18 .0 - DESCRIPTION OF PARAMETERS SECTION .
The drive is suitable for use on a circuit capable of delivering not more than 18,000 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 SUPPLY TRANSFORMER 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 MICRO Series 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
size should be 10 amps, regardless of input current rating). Refer to Section 5.0 - DRIVE RATINGS.
Minimum voltage rating of the protection device should be; 250 VAC for 240/120 VAC and 240/200 VAC
rated drives, and 600 VAC for 480/400 VAC and 590 VAC drives .
Current limiting type fuses should be used when input fusing is required. Select Class CC or Class T fuses
with low I2T value, rated at 200,000 AIC. Recommended fuses are Bussman type KTK-R, JJN, JJS or
equivalent. Similar fuses with equivalent ratings by other manufacturers may also be acceptable.
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WARNING