A noise filter on the output side of the drive decreases inductive noise and radio frequency interference.
Figure 1 shows an example of noise filter wiring.
| Notice |
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Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (ELCB) to the motor circuit.
If you connect these devices to the output circuits, it can cause damage to the drive and connected equipment.
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Figure 1. Example of Connecting the Noise Filter on the Output Side (Secondary Side)
- Power supply
- Drive
- Noise filter on output side (secondary side)
- Motor
Note:
Glossary
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Radio frequency interference:
Electromagnetic waves radiated from the drive and cables make noise through the full radio bandwidth that can have an effect on nearby devices.
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Inductive noise:
The noise from electromagnetic induction can have an effect on the signal line and can cause the controller to malfunction.
Prevent Inductive Noise
In addition to installing a noise filter, you can also run all wiring through a grounded metal conduit to decrease inductive noise occurring at the output side. Put the cables a minimum of 30 cm (11.8 in) away from the signal line to prevent induced noise. Ground the cables to metal conduits.
Figure 2. Prevent Inductive Noise
- Power supply
- Drive
- Shielded motor cable
- Motor
- Minimum of 30 cm (11.8 in) apart
- Controller
- Signal line
Decrease Radio Frequency Interference
The drive, input lines, and output lines generate radio frequency interference. Use noise filters on input and output sides and install the drive in a steel box to decrease radio frequency interference.
Note:
Keep the cable between the drive and motor as short as possible.
Figure 3. Decrease Radio Frequency Interference
- Steel box
- Power supply
- Noise filter
- Drive
- Noise filter
- Shielded motor cable
- Motor