Omron EasySpeed 3G3JE, User Manual

Page: 36 / 133

Chapter 2
2-14
Design
● Do Not Use an Electromagnetic Switch of Magnetic Contactor
• If a load is connected to the Inverter during operation, an inrush current will trigger the overcurrent
protective circuit in the Inverter. Do not connect an electromagnetic switch or a magnetic contactor
to the output circuit.
● Installing a Thermal Relay
The Inverter uses an electronic thermal to protect the motor from overheating. Take the following
countermeasures if more than one motor is operated with one Inverter or a multi-polar motor is used.
• Install a thermal relay between the Inverter and each motor and set P01 (Rated motor current) to
0.0. (Motor overload detection (E03) will be disabled.)
• Make a sequence so that the magnetic contactor on the input side of the main circuit is turned OFF
by the contacts of the thermal relay.
● Installing a Noise Filter on the Output Side
Connect a noise filter to the output side of the Inverter to reduce radio noise and induction 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.
●
Countermeasures against Induction Noise
Use the following method to prevent induction noise from being generated on the output side.
• Route cables through a grounded metal pipe. Keeping the metal pipe at least 30 cm away from the
signal lines considerably reduces induction noise.
Signal line
Inductive noise Radio noise
Controller
AM radio
3G3JE
Inverter
3G3IV-PLF310KA
Noise Filter
Three-phase
200 to 230 V AC
M
3
~
MCCB
30 cm min.
Controller
M
3
~
Metal pipe
Three-phase
200 to 230 V AC
MCCB
3G3JE
Inverter
Signal line