YASKAWA CIMR-F7A Instruction Manual page 52

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 a stop.
The Inverter can be started and stopped by opening and closing the magnetic contactor on the primary side.
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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.
When the Inverter is operated with the Digital Operator, automatic operation cannot be performed after
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recovery from a power interruption.
If the Braking Resistor Unit is used, program the sequence so that the magnetic contactor is turned OFF by
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the contact of the Unit's thermal overload relay.
Connecting Input Power Supply to the Terminal Block
Input power supply can be connected to any terminal R, S or T on the terminal block; the phase sequence of
input power supply is irrelevant to the phase sequence.
Installing an AC Reactor or DC Reactor
If the Inverter is connected to a large-capacity power transformer (600 kW or more) or the phase advancing
capacitor is switched, an excessive peak current may flow through the input power circuit, causing the con-
verter unit to break down.
To prevent this, install an optional AC Reactor on the input side of the Inverter or a DC reactor to the DC reac-
tor connection terminals.
This also improves the power factor on the power supply side.
Installing a Surge Absorber
Always use a surge absorber or diode for inductive loads near the Inverter. These inductive loads include mag-
netic contactors, electromagnetic relays, solenoid valves, solenoids, and magnetic brakes.
Installing a Noise Filter on Power Supply Side
Install a noise filter to eliminate noise transmitted between the power line and the Inverter.
Correct Noise Filter Installation
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Power
supply
-16
2
MCCB
Noise
Inverter
filter
MCCB
Other
controllers
Fig 2.7 Correct Power supply Noise Filter Installation
IM
Use a special-purpose noise filter for Inverters.