Omron SYSDRIVE 3G3MV A2002, Руководство пользователя

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2-26
·
For the special-purpose breaker for Inverters, choose a ground fault interrupter with a
sensitivity amperage of at least 10 mA per Inverter.
·
When using a general leakage breaker, choose a ground fault interrupter with a sensi-
tivity amperage of 200 mA or more per Inverter and with an operating time of 0.1 s or
more.
D
Installing a Magnetic Contactor
If the power supply of the main circuit is to be shut off because of the sequence, a mag-
netic contactor can be used instead of a molded-case circuit breaker.
When a magnetic contactor is installed on the primary side of the main circuit to stop a
load forcibly, however, the regenerative braking does not work and the load coasts to a
stop.
·
A load 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.
·
When the Inverter is operated with the Digital Operator, automatic operation cannot be
performed after recovery from a power interruption.
·
When using the Braking Resistor Unit, be sure to arrange a sequence in which the ther-
mal relay of the Unit turns the magnetic contactor OFF.
D
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).
D
Installing an AC Reactor
If the Inverter is connected to a large-capacity power transformer (660 kW or more) or
the external phase advance capacitor of the customer is switched, an excessive peak
current may flow through the input power circuit, causing the converter unit to break
down.
To prevent this, install an optional AC reactor on the input side of the Inverter.
This also improves the power factor on the power supply side.
D
Installing a Surge Absorber
Always use a surge absorber or diode for the inductive loads near the Inverter. These
inductive loads include magnetic contactors, electromagnetic relays, solenoid valves,
solenoid, and magnetic brakes.
Design Chapter 2