Omron SYSDRIVE 3G3FV CE Series - Wiring on the Input Side of Main Circuit

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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.
• 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
Fault output (NC)
(see note 1)
Fuse
Shield
Noise filter
L1 (R)
L2 (S)
L3 (T)
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.
Installation Chapter 2
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