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Design
• For the MCCB's time characteristics, be sure to consider the Inverter's overcurrent protection (one
minute at 150% of the rated output current).
• A sequence that turns OFF the power supply using the alarm (ALM) output of the 3G3JE can be
made as shown in the following diagram.
Three-phase
MCCB
200 to 230 V AC
●
Installing a Ground Fault Interrupter
• Inverter outputs use high-speed switching, so high-frequency leakage current is generated. (In gen-
eral, a leakage current of approximately 100 mA will occur for each Inverter when the power cable
is 1 m and approximately 5 mA for each additional meter of power cable.)
• Use a separate breaker for the power supply input section of the Inverter that removes high-fre-
quency leakage currents and detects only leakage currents with frequencies hazardous to human
beings. Use a breaker with a sensitivity amperage of at least 10 mA per Inverter.
• When using a general leakage breaker, choose a ground fault interrupter with a sensitivity amper-
age of 200 mA or more per Inverter and with an operating time of 0.1 s or more.
●
Installing a Magnetic Contactor
• If the power supply of the main circuit is to be turned OFF because of the sequence, a magnetic
contactor (MC) can be used. (When a magnetic contactor is installed on the primary side of the
main circuit to forcibly stop a load, however, the regenerative braking will not work and the load will
coast to a stop.)
• A load can be started and stopped by switching the magnetic contactor. Frequently switching the
magnetic contactor, however, may cause the Inverter to break down. To maintain the service life of
the Inverter's internal electrolytic capacitors, it is recommended that the MC be switched to start/
stop operation no more than once every 30 minutes.
• When the Inverter is operated with the Digital Operator, automatic operation cannot be performed
after recovery from a power interruption.
●
Connecting Input Power Supply to the Terminal Block
Input power supply can be connected to any terminal on the terminal block because the phase
sequence of input power supply is irrelevant to the phase sequence (R/L1, S/L2, and T/L3).
X1
X1
X2
OFF
ON
X1
R/L1
S/L2
T/L3
X2
ALM (+)
ALM (−)
DC (24 V) relay
Chapter 2
3G3JE
Inverter
(30 VDC, 50 mA max.)
2-11
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