Omron SYSDRIVE 3G3JV User Manual page 43

Design
• 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. In order not to shorten the service life of the Inverter's internal relays and electrolytic capacitors,
it is recommended that the magnetic contactor is used in this way no more than once every 30 min-
utes.
• When the Inverter is operated with the Digital Operator, automatic operation cannot be performed af-
ter recovery from a power interruption.
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 se-
quence of input power supply is irrelevant to the phase sequence (R/L1, S/L2, and R/L3).
D Installing an AC Reactor
If the Inverter is connected to a large-capacity power transformer (660 kW or more) or the phase ad-
vance capacitor is switched, an excessive peak current may flow through the input power circuit, caus-
ing 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.
D 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
Power
supply
Note Use a Noise Filter designed for the Inverter. A general-purpose Noise Filter will be less effective
and may not reduce noise.
2-18
Input Noise Filters
Simple Input Noise Filter: 3G3EV-PLNFDj
EMC-conforming Input Noise Filter: 3G3JV-PRSj
Noise
Filter
3G3JV
SYSDRIVE
Programmable
Controller
Chapter 2