Wiring
3.4.5 Wiring the Main Circuits
3-14
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
reactor 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
magnetic contactors, electromagnetic relays, solenoid valves, solenoids, and magnetic brakes.
Wiring the Power Terminals of Inverters with 18.5 to 300 kW Outputs
D
For 200 V class Inverters of 18.5 to 75 kW or 400 V class Inverters of 18.5 to 45 kW, connect the r
and terminals to the R and S terminals respectively. (These are shorted by a short-circuit bar for ship-
ping.)
D
For 400 V class, 55 to 300 kW, connect the r and 400 terminals to the R and S terminals respectively.
(These are shorted by a short-circuit bar for shipping.)
Installing a Noise Filter on Power Supply Side
Install a noise filter to eliminate noise transmitted between the power line and the Inverter.
D
Wiring Example 1
MCCB
Power
supply
MCCB
Noise
filter
VS-616G5
IM
Other
controllers
Use a special-purpose noise filter for In-
verters.
Fig 3.8 Correct Power supply Noise Filter Installation
D
Wiring Example 2
General-
purpose
noise filter
General-
purpose
noise filter
MCCB
Power
supply
MCCB
MCCB
Power
supply
MCCB
VS-616G5
IM
Other
controllers
VS-616G5
IM
Other
controllers
Do not use general-purpose noise filters. No gen-
eral-purpose noise filter can effectively suppress
noise generated from the Inverter.
Fig 3.9 Incorrect Power supply Noise Filter Installation
3
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