Design
Chapter 3
D Installing an AC Reactor
If the Inverter is connected to a large-capacity power transformer (600 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.
D Installing a Surge Absorber
Always use a surge absorber or diode for the inductive loads to be connected to the
Inverter. These inductive loads include magnetic contactors, electromagnetic relays,
solenoid valves, solenoids, and magnetic brakes.
D Wiring of Braking Resistor/Braking Resistor Unit
When using an Inverter for loads with a large inertia or for vertical axis loads, regenera-
tive energy will be fed back.
If the regenerative energy exceeds the Inverter capacity, overvoltage will be detected in
the main circuit. In such a case, use a Braking Resistor or Braking Resistor Unit.
Note Be sure to create a sequence that will turn OFF the Inverter power supply when
resistor overheating occurs. When using a Braking Resistor, be sure to install a
thermal relay to detect resistor overheating. When using a Braking Resistor Unit,
use an error output contact. Otherwise, a fire may occur.
3G3EV Model
Braking Resistor
(Duty Cycle 3%ED)
Braking Resistor
Unit
Minimum
connected
(Duty Cycle 10%ED) resistance
3G3IV-PERF150WJ401 ---
(400 Ω)
200 Ω
200 Ω
200 Ω
80 Ω
A2001(-j)/AB001(-j)
A2002(-j)/AB002(-j)
A2004(-j)/AB004(-j)
A2007(-j)/AB007(-j)
A2015(-j)/AB015(-j)
3G3IV-PERF150WJ201 3G3IV-PLKEB20P7
(200 Ω)
(200 Ω 70 W)
3G3IV-PERF150WJ101 3G3IV-PLKEB21P5
60 Ω
(100 Ω) (100 Ω 260 W)
3G3IV-PERF150WJ751 3G3IV-PLKEB40P7
(750 Ω) (750 Ω 70 W)
750 Ω
510 Ω
240 Ω
A4002(-j)/A4004(-j)
A4007(-j)
3G3IV-PERF150WJ401 3G3IV-PLKEB41P5
(400 Ω) (400 Ω 260 W)
A4015(-j)
Note Do not use a Resistor whose resistance is below the minimum connected resis-
tance. Otherwise, the Inverter will be damaged.
3-13
OMRON [ OMRON ELECTRONICS LLC ]
