Lenze MC1000 Series - Manual (Page 23)

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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% over voltage or 15% under voltage.
NOTE: Drives with dual rated input voltage must be programmed for the proper
supply voltage. Refer to 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 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 size should be 10 amps, regardless of input
current rating). Refer to Section 5 - MC1000 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.
Use UL Class CC or Class T current-limiting type fuses with low I
2 T values, rated
at 200,000 AIC. Recommended fuses are Bussman type KTK-R, JJN, and JJS, or
equivalent.
WARNING!
Per UL requirements, use a FUSE (not a circuit breaker) for 240VAC drives
requiring >40A protection and for 480VAC & 600VAC drives requiring
>32A protection.