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2 Design
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
2-3 Wiring
2
2-3-4 Wiring for Main Circuit Terminals
Precautions for connecting more than one motors to inverter’s output
terminals
If connecting more than one motors to the output terminals of the inverter, note the following three
points.
• Make sure that the rated current of the inverter is higher than the sum of the rated current values
of the connected motors. Select an inverter with a sufficient capacity, taking emergency situations
into consideration.
• The inverter cannot provide overload protection for individual motors, because it only detects a
sum of the current values for all the connected motors. Install a thermal relay for each motor. The
RC value of each thermal relay must be 1.1 times larger than the rated current of the motor.
• Set the inverter to detect only overloading that occurred in it by setting the Electronic Thermal
Level to the rated output current of the inverter.
Installing output noise filter
Connecting a noise filter to the output side of the inverter enables the reduction of radio noise and
inductive noise.
Measures against inductive noise
In addition to the noise filter described above, you can suppress the inductive noise produced on the
output side by connecting a bundle of wires through a grounded metal conduit. Moreover, simply
moving the conduit 30 cm away from signal lines also helps the reduction of inductive noise.
Noise Description
Inductive noise
Produced by electromagnetic induction, this noise causes malfunction of control equipment
due to noise in signal lines.
Radio noise
The electromagnetic waves emitted from the inverter body or cables cause noise in radio
receivers.
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