Omron J7 series, User Manual

Page: 34 / 177

20
Wiring
Chapter 2-2
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 R/L3).
Installing an AC Reactor If the Inverter is connected to a large-capacity power transformer (660 kW or
more) or the phase advance capacitor 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.
Installing a
Surge Absorber Always use a surge absorber or diode for the inductive loads near the Inverter.
These inductive loadsinclude magnetic contactors, electromagnetic relays,
solenoid valves, solenoid, and magnetic brakes.
Installing a Noise Filter
on the Power Supply Side The Inverter’s outputs uses high-speed switching, so noise may be
transmitted from the Inverter to the power line and adversely effect other
devices in the vicinity. It is recommended that a Noise Filter be installed at the
Power Supply to minimize noise transmission. Noise will also be reduced from
the power line to the Inverter.
Wiring Example 1
Note Use a Noise Filter designed for the Inverter. A general-purpose Noise Filter
will be less effective and may not reduce noise.
Power
supply
Input Noise Filters
EMC-conforming Input Noise Filter: 3G3JV-PFI
_
Noise
Filter
VARISPEED
Programmable
Controller
CIMR-J7AZ MCCB
MCCB