Saftronics VG520P4 Technical Manual page 45

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Wiring on the Output Side of Main Circuit
Connecting the Inverter and Motor
Connect output Terminals T1, T2, and T3 (U, V and W) to motor lead wires T1, T2, and T3, respectively.
Check that the motor rotates forward with the forward RUN command. Switch over any two of the output terminals 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 T1, T2, and T3 (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 casing, an
electric shock or grounding will occur. This is extremely hazardous. Do not short the output wires.
Do Not Use a Power Factor Correction Capacitor or Noise Filter
Never connect a Power Factor Correction Capacitor or LC/RC noise filter to an output circuit. Doing so may result in
damage to the Inverter or cause other parts to burn.
Do Not Use an Electromagnetic Switch or Magnetic Contactor
Do not connect an electromagnetic switch or Magnetic Contactor to an output circuit. If a load is connected to the
Inverter during operation, a surge current will actuate the overcurrent protective circuit in the Inverter.
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 Overload Relay
between the Inverter and the motor and set L1-01 to 0 (no motor protection).
Set the Thermal Overload Relay to the value on the motor nameplate when operating at 40 Hz and to 1.1 times the
value on the nameplate when operating at 60 Hz. 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.
Inductive Noise:
Radio Noise:
Countermeasures Against Inductive Noise
As described previously, a noise filter can be used to prevent inductive noise from being generated on the output
side. Alternatively, cables can be routed through a grounded metal pipe to prevent inductive noise. Keeping the
metal pipe at least 30 cm away from the signal line considerably reduces inductive noise.
Firmware – S1043
Revision: 2 (9/98)
VG5
Electromagnetic induction generates noise on the signal line, causing the controller to
malfunction.
Electromagnetic waves from the Inverter and cables cause the broadcasting radio receiver to
make noise.
Figure 3.10 Installing a Noise Filter on the Output Side
VG5
Figure 3.11 Countermeasures Against Inductive Noise
35
Chapter 3: Wiring
© Saftronics, Inc.