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8
INPUT AC REQUIREMENTS
WARNING!
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 - DESCRIPTION OF PARAMETERS .
The UL file for this drive shows that it is suitable for use on a circuit capable of delivering
not more than 200,000 RMS symmetrical amperes, at the drive's rated voltage . The CSA
file identifies a short-circuit withstand rating of 5,000 RMS symmetrical amperes at the
drives 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 MC3000 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 – MC3000 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 590/480 Vac drives .
Current limiting type fuses should be used when input fusing is required . Select fuses
2
with low I
T values, rated at 200,000 AIC . Recommended fuses are Bussman type
kTk-R, JJN or JJS . Similar fuses with equivalent ratings by other manufacturers may
also be acceptable .
18
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
M301L
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