Omron SYSDRIVE 3G3MV User Manual page 58

Design
Reactor Effects
Harmonics are effectively suppressed when the DC reactor is used with the AC reactor
as shown in the following table.
Harmonics Harmonics
suppression suppression
method
har-
monic
No reactor 65
AC reactor 38
DC reactor 30
DC and AC 28
reactors
H Connecting the Braking Resistor and Braking Resistor Unit
When running a load with a large inertia or a vertical axis, regeneration energy will return
to the Inverter. If OV (overvoltage) is generated during deceleration, this indicates that
the regeneration energy is exceeding the capacity of the Inverter. In this case, use a
Braking Resistor or a Braking Resistor Unit.
·Connect the Braking Resistor as shown in the following diagram.
Note 1. When using a Braking Resistor, install a thermal relay to monitor the tempera-
ture of the resistor.
Note 2. When using a Braking Resistor or a Braking Resistor Unit, be sure to include a
sequence whereby the power supply for the Inverter will be turned OFF in the
case of abnormal overheating. Not doing so may result in burning.
S Braking Resistor: Use the output of the thermal relay used to monitor the tempera-
ture of the thermometer.
S Braking Resistor Unit: Use the error contact output of the Braking Resistor Unit.
Harmonic generation rate (%)
5th 7th 11th
har- har-
monic monic
41 8.5
14.5 7.4
13 8.4
9.1 7.2
13th 17th
har- har-
monic monic
7.7 4.3 3.1
3.4 3.2 1.9
5 4.7 3.2
4.1 3.2 2.4
Chapter 2
19th 23rd
har- har-
monic monic monic
2.6 1.8
1.7 1.3
3.0 2.2
1.6 1.4
25th
har-
2-35