2-18
When using an magnetic contactor to switch to a commercial power supply, stop the Inverter and motor before
operating the magnetic contactor. Use the speed search function if the magnetic contactor is operated during
operation. If measures for momentary power interrupts are required, use a delayed release magnetic contactor.
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 2.9 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 2.10 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
Inverter
Noise
filter
MCCB
Power
supply
Radio noise
AM radio
Inductive
noise
Controller
Signal line
Controller
Signal line
IM
Inverter
MCCB
Power
supply
30 cm min.
Metal pipe
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