Lenze MC3000 Series Bedienungsanleitung PDF herunterladen (Seite 22)

18 13435743_EDBM301_v14.0

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 uctuation

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 le 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 dierent 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

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.

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.

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