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Installation
H Wiring on the Input Side of Main Circuit
D Installing a Molded-case Circuit Breaker
Provide fuses recommended for each Inverter between the power supply and the power input terminals
(L1, L2, and L3). It is recommended that a molded case circuit breaker (MCCB) that matches the Invert-
er be provided between the power supply and the input terminals to facilitate easy operation and main-
tenance.
• Install one MCCB for each Unit.
• Choose an MCCB with a capacity of 1.5 to 2 times the Inverter's rated current.
• For the MCCB's time characteristics, be sure to consider the Inverter's overload protection (one min-
ute at 150% of the rated output current).
• Since diodes and cables of individual Inverters need not be protected, if the MCCB is to be used in
common among multiple Inverters or other devices, set up a sequence such that the power supply will
be turned off by an fault output, as shown in the following diagram.
Single phase 200 VAC
3-phase 400 VAC
Note 1. Terminals 19 and 20 are terminal numbers for the 3G3FV, and MB and MC are terminal num-
bers for the 3G3FV. Since the terminals MB and MC are multi-functional outputs, set to "Error
(n040=0)."
Note 2. Connect a 400-/200-V transformer for the 2,400-V-class model.
D Installing a Ground Fault Interrupter
Inverter outputs use high-speed switching, so high-frequency leakage current is generated. In general,
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. Therefore, at the power supply input
area, use a special-purpose breaker for Inverters, which detects only the leakage current in the frequen-
cy range that is hazardous to humans and excludes high-frequency leakage current.
Countermeasures taken for the EMC tend to increase the leakage current, therefore careful attention
must be paid in selecting a breaker.
• For the special-purpose breaker for Inverters, choose a ground fault interrupter with a sensitivity am-
perage of at least10 mA per Inverter.
• When using a general leakage breaker, choose a ground fault interrupter with a sensitivity amperage
of 200 mA or more per Inverter and with an operating time of 0.1 s or more.
2-32
Shield
Fuse
www.dadehpardazan.ir 88594014-15
Noise filter
L1 (R)
L2 (S)
L3 (T)
Fault output (NC)
(see note 1)
Chapter 2
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