Installing A Thermal Relay; Installing A Noise Filter On Output Side; Countermeasures Against Induction Noise - Omron SYSDRIVE 3G3HV SERIES User Manual

Installation
D Installing a Thermal 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 multi-polar motor is used, always install a
thermal relay (THR) between the Inverter and the motor and set n033 to 0 (no thermal protection).
In this case, program the sequence so that the magnetic contactor on the input side of the main circuit is
turned off by the contact of the thermal relay.
D Installing a Noise Filter on Output Side
Connect a noise filter to the output side of the Inverter to reduce radio noise and induction noise.
Power
supply
Induction 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.
D Countermeasures Against Induction Noise
As described previously, a noise filter can be used to prevent induction noise from being generated on
the output side. Alternatively, cables can be routed through a grounded metal pipe to prevent induction
noise. Keeping the metal pipe at least 30 cm away from the signal line considerably reduces induction
noise.
Power
supply
3G3HV
Signal line
Controller
3G3HV
Signal line
Noise filter
Induction
Radio noise
noise
AM radio
Metal pipe
30 cm min.
Controller
Chapter 2
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