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When the Inverter is operated with the Digital Operator, automatic operation cannot be performed after
recovery from a power interruption.
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If a Braking Unit and a Braking Resistor Unit are used, program the sequence so that the magnetic contac-
tor is turned OFF by the contact of the Braking Resistor 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
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 (for units from 22 kW the DC reactor is standard).
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.
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Correct Noise Filter Installation
Fig 2.7 Correct Power supply Noise Filter Installation.
Use a special-purpose noise filter for Inverters.
Ordinary: 3G3EV-PLNFD
/
3G3IV-PFN
EMC compatible: 3G3RV-PFI
Power supply
3G3PV
Inverter
Noise
filter
Other
controllers