Wiring The Main Circuits - Omron I537-E2-01 User Manual

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Wiring the Main Circuits

This section describes wiring connections for the main circuit inputs and outputs.
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Wiring Main Circuit Inputs
Observe the following precautions for the main circuit power supply input.
Installing a Molded-case Circuit Breaker
When connecting the power input terminals (R/L2, S/L2 and T/L3) and power supply via a molded-case cir-
cuit breaker (MCCB) observe that the circuit breaker is suitable for the Inverter.
• 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 minute at
120% of the rated output current).
• If the same MCCB is to be used for more than one Inverter, or other devices, set up a sequence, that the
powersupply will be turned OFF by a fault output, as shown below.
Power supply
* For 400-V class Inverters, connect a 400/200-V transformer.
Installing a Ground Fault Interrupter
Inverter outputs use high-speed switching, so high-frequency leakage current is generated. Therefore, at the
Inverter primary side, use a ground fault interrupter to detect only the leakage current in the frequency range
that is hazardous to humans and exclude high-frequency leakage current.
For the special-purpose ground fault interrupter for Inverters, choose a ground fault interrupter with a sen-
•
sitivity amperage of at least 10 mA per Inverter.
When using a general ground fault interrupter, 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 for the main circuit is to be shut off during a sequence, a magnetic contactor can be used.
When a magnetic contactor is installed on the primary side of the main circuit to forcibly stop the Inverter,
however, the regenerative braking does not work and the Inverter will coast to stop.
The Inverter can be started and stopped by opening and closing the magnetic contactor on the primary side.
•
Frequently opening and closing the magnetic contactor, however, may cause the Inverter to break down.
Start and stop the Inverter at most once every 30 minutes.
Fig 2.6 MCCB Installation
Wiring Main Circuit Terminals
Inverter
Fault out-
put (NC)
15
2-