Omron J7 series, User Manual

Page: 35 / 177

21
Wiring
Chapter 2-2
Wiring on the Output Side of the Main Circuit
Connecting the Terminal
Block to the Load Connect output terminals U/T1, V/T2, and W/T3 to motor lead wires U, V, and
W.
Check that the motor rotates forward with the forward command. Switch over
any two of the output terminals to each other and reconnect if the motor
rotates in reverse with the forward command.
Never Connect a
Power Supply to Output
Terminals Never connect a power supply to output terminals U/T1, V/T2, or W/T3.
If voltage is applied to the output terminals, the internal circuit 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 casing, an electric shock or grounding will occur.
This is extremely hazardous.
Also, be careful not to short the output wires.
Do not Use a Phase
Advancing Capacitor or
Noise Filter Never connect a phase advance capacitor or LC/RC Noise Filter to the output
circuit.
Doing so will result in damage to the Inverter or cause other parts to burn.
Do not Use an
Electromagnetic Switch of
Magnetic Contactor Do not connect an electromagnetic switch of magnetic contactor to the output
circuit.
If a load is connected to the Inverter during running, an inrush current will
actuate the overcurrent protective circuit in the Inverter.
Installing a Thermal Relay The 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 n33 to 2 (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.
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.
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.
Power
supply
CIMR-J7AZ
VARISPEED
Noise
Filter
Induction noise Radio noise
Signal line
Controller AM radio
MCCB