Omron VARISPEED G7 Instruction Manual page 49

Incorrect Noise Filter Installation
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Wiring the Output Side of Main Circuit
Observe the following precautions when wiring the main output circuits.
Connecting the Inverter and Motor
Connect output terminals U, V, and W to motor lead wires U, V, and W, respectively.
Check that the motor rotates forward with the forward run command. Switch over any two of the output termi-
nals to each other and reconnect if the motor rotates in reverse with the forward run command.
Never Connect a Power Supply to Output Terminals
Never connect a power supply to output terminals U, V, and W. If voltage is applied to the output terminals,
the internal circuits of the Inverter will be damaged.
Never Short or Ground Output Terminals
If the output terminals are touched with bare hands or the output wires come into contact with the Inverter cas-
ing, an electric shock or grounding will occur. This is extremely hazardous. Do not short the output wires.
Do Not Use a Phase Advancing Capacitor or Noise Filter
Never connect a phase advancing capacitor or LC/RC noise filter to an output circuit. The high-frequency
components of the Inverter output may result in overheating or damage to these part or may result in damage
to the Inverter or cause other parts to burn.
Do Not Use an Electromagnetic Switch
Never connect an electromagnetic switch (MC) between the Inverter and motor and turn it ON or OFF during
operation. If the MC is turned ON while the Inverter is operating, a large inrush current will be created and the
overcurrent protection in the Inverter will operate.
-16
2
Power
supply
MCCB
MCCB
General-
purpose
noise filter
Power
MCCB
supply
General-
purpose
noise filter
MCCB
Fig 2.8 Incorrect Power supply Noise Filter Installation
Inverter
IM
Other
controllers
Inverter
IM
Other
controllers
Do not use general-purpose noise filters. No general-
purpose noise filter can effectively suppress noise
generated from the Inverter.