Fuji Electric FRENIC-Ace series - Measures; 1 ] Noise Prevention Prior to Installation; 2 ] Implementation of Noise Prevention Measures; A.3 Measures

Appendix A Trouble-free Use of Inverters (Notes on electrical noise)
Appendix-5
APPENDICES
A.3 Measures
As the noise prevention is strengthened, the more effective it is. However, with the use of appropriate measures,
noise problems may be resolved easily. It is necessary to implement economical noise prevention according to the
noise level and the equipment conditions.
[ 1 ] Noise prevention prior to installation
Before installing an inverter in your control panel or installing an inverter panel, you need to consider noise
prevention. Once noise problems occur, it will cost additional materials and time for solving them.
Noise prevention prior to installation includes:
(1) Separate the main circuit from the control circuit.
(2) Accommodate the main circuit wiring in a metal pipe (conduit pipe).
(3) Use shielded wire or twisted shielded wire in the control circuit.
(4) Perform reliable grounding work and wiring.
These noise prevention measures can avoid most noise problems.
[ 2 ] Implementation of noise prevention measures
There are two types of noise prevention measures--one for noise propagation routes and the other for noise
receiving sides (that are affected by noise).
The basic measures for reducing the effect of noise at the receiving side include: Separating the main circuit wiring
from the control circuit wiring, avoiding noise effect.
Measures on the noise-affected side are:
(1) Lower the noise level for example by installing a noise filter.
(2) Suppress the noise level for example by using a metal wiring pipe or metal control panel.
(3) Block the noise propagation route for example by using an insulation transformer for power source.
Table A-1 lists the noise prevention measures, their goals, and propagation routes.
Table A-1 Noise Prevention Measures
Noise prevention method
Goal of noise
prevention measures
Conduction route
Make it more difficult to
receive noise
Cutoff noise conduction
Confine noise
Reduce noise level
Conducted noise
Induction noise
Radiated noise
Wiring and installation
Separate main circuit from control circuit
Y
Y
Minimize wiring distance
Y
Y
Y
Y
Avoid parallel and bundled wiring Y Y
Use appropriate grounding
Y
Y
Y
Y
Use shielded wire and twisted shielded wire
Y
Y
Y
Use shielded cable in main circuit
Y
Y
Use metal conduit pipe Y Y Y
Control panel
Appropriate arrangement of devices in panel
Y
Y
Y
Metal control panel
Y
Y
Y
Anti-noise devices
Line filter
Y
Y
Y
Y
Insulation transformer Y Y Y
Measures taken on
noise-affected side
Use a passive capacitor for control circuit
Y
Y
Y
Use ferrite core for control circuit
Y
Y
Y
Line filter
Y
Y
Other
Separate power supply systems Y Y Y
Lower the carrier frequency
Y
Y
Y
Y
In the table, a column marked with Y shows a measure expected to produce an effect depending on the conditions.
An empty column shows an ineffective measure.