Omron SYSDRIVE 3G3RV, User Manual

Page: 60 / 446

2
-24
When
using an MC to switch to a commercial power supply, stop the Inverter and motor before operating the
MC.
Use the speed search function if the MC is operated during operation. If measures for momentary power
interrupts
are required, use a delayed release MC.
Installing a Thermal Overload Relay
This
Inverter has an electronic thermal protection function to protect the motor from overheating. If, however,
more
than one motor is operated with one Inverter or a multi-polar motor is used, always install a thermal
relay
(THR) between the Inverter and the motor and set L1-01 to 0 (no motor protection). The sequence
should
be designed so that the contacts of the thermal overload relay turn OFF the magnetic contactor on the
main
circuit inputs.
Installing a Noise Filter on Output Side
Connect
a noise filter to the output side of the Inverter to reduce radio noise and inductive noise.
Fig 2.12 Installing a Noise Filter on the Output Side
Countermeasures Against Inductive Noise
As
described previously, a noise filter can be used to prevent inductive noise from being generated on the out-
put
side. Alternatively, cables can be routed through a grounded metal pipe to prevent inductive noise. Keep-
ing
the metal pipe at least 30 cm away from the signal line considerably reduces inductive noise.
Fig 2.13 Countermeasures Against Inductive Noise
Inductive Noise: Electromagnetic induction generates noise on the signal line, causing the controller to malfunction.
Radio Noise: Electromagnetic waves from the Inverter and cables cause the broadcasting radio receiver to make
noise.
IM
MCCB
Power
supply
Inverter
Noise
filter
Signal line
Inductive
noise
Radio noise
AM radio
Controller
3G3RV 3G3IV-PLF
IM
MCCB
Power
supply
Inverter
Signal line
Controller
Metal pipe
30 cm min.
3G3RV