Omron SYSDRIVE 3G3MX-A2002, Руководство пользователя

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2-18
2-3 Wiring
2
Design
„
Wiring the Main Circuit Terminals (Input Side)
Installing a Molded-case Circuit Breaker (MCCB)
• Always connect the Inverter and power supply via a molded-case circuit breaker (MCCB) to protect
the Inverter from damage that may result from short-circuiting.
• Always connect the power input terminals (R/L1, S/L2, and T/L3) and power supply via an MCCB,
according to the Inverter capacity.
• Install one MCCB per Inverter.
• Choose an appropriate MCCB capacity according to the fuse size on page 2-15.
• When choosing an MCCB's time characteristics, be sure to consider the Inverter's overload
protection (1 minute at 150% of the rated output current).
• By programming the sequence as illustrated below, you can turn off the power via the relay outputs
(MA, MB, and MC) for the 3G3MX Series.
* Terminal symbols for 3G3MX-AE
†††
are indicated in parentheses ( ).
Installing a Ground Fault Interrupter
• The Inverter's output uses high-speed switching, and so generates high-frequency current
leakage. (Generally, if the power cable is 1 m, the leakage current is approx. 100 mA per Inverter,
and approx. 5 mA is added per additional meter.)
• At the power supply input part, install a special-purpose ground fault interrupter for Inverters that
exclude high-frequency leakage current and detect only the leakage current within a frequency
range that is hazardous to humans. (Choose a ground fault interrupter with a sensitivity current of
at least 10 mA per Inverter.)
• Alternatively, use a general ground fault interrupter with a sensitivity current of 200 mA or more per
Inverter, and with an operating time of 0.1 s or more.
Installing a Magnetic Contactor (MC)
• If the power supply of the main circuit is shut off due to sequencing, a magnetic contactor (MC) can
be used. (When forcibly stopping the load with an MC on the primary side of the main circuit,
however, the regenerative braking does not work and the load coasts to a stop (free run).)
• Frequently opening and closing the magnetic contactor (MC) to start and stop a load may cause
the Inverter to break down. To extend the life of the Inverter's internal electrolytic capacitor, limit
the frequency to no more than once every 30 minutes.
Connection Sequence to the Terminal Block
• Input power supply can be connected to any terminal because the phase sequence of the input
power supply is irrelevant to that of the terminal block (R/L1, S/L2, and T/L3).
R/L1 (L1)
S/L2 (L2)
T/L3 (N/L3)
Molded case
circuit-breaker
(MCCB)
MC
Power supply
Inverter
3G3MX
OFF
ON
X1
X2
X1
X2
X1
MA
MC
(30 V DC, 50 mA max.)
DC (24 V) relay