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Design
Do Not Use an Electromagnetic Switch of Magnetic Contactor
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• 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.
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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.
Three-phase
200 to 230 V AC
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.
Three-phase
200 to 230 V AC
2-14
MCCB
3G3JE
Inverter
Signal line
MCCB
3G3JE
Inverter
Signal line
3G3IV-PLF310KA
Noise Filter
Inductive noise
AM radio
Controller
Metal pipe
30 cm min.
Controller
Chapter 2
M
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3
Radio noise
M
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3
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