Process Plant

It is no secret that machinery in a plant generates noise. The question has always been “how much noise?” With increasing frequency, people are observing machinery behavior that was never intended in the original design. This behavior could manifest as a machine that occasionally or constantly resets, machinery that goes off track, or machinery that stops working properly. Much of this behavior can be traced to inter-machine noise.

What creates this noise? Many machines use Servo drive and Variable Frequency Drives (VFDs) to control rotating machinery. These VFDs create high frequency noise that radiates out on the input power cable. If a drive cable is close enough to a signal cable that the two cables couple, then the noise from the drive cable will radiate onto the signal cable. The signal can be overwhelmed by the noise and cause false readings. This can then cause the PLC to make incorrect decisions.

Another source of noise is the Silicon Controlled Rectifier (SCR). These devices are often seen in welding and brazing equipment, industrial ovens, and other large applications where systems need to develop or maintain temperatures in the system. As the SCR turns on, the voltage on the input power line momentarily drops because of insufficient power to feed the load. This causes glitches on the power lines within the plant. This glitch may cause a nearby PLC to reset if the glitch duration is long enough.

Enerdoor's solution to noise problems is to install EMC filters on each panel that controls a VFD or an SCR. These filters help in two ways. First, the filter stops noise from leaving the machine and then the EMC filter stops noise from within the plant from entering the machine.

Browse Recommended Filters:

Single Phase RFI Filter Models: FIN27 Single Phase RFI Filter | FIN27G Single Phase RFI Filter | FIN40 Single Phase RFI Filter | FIN50 Single Phase RFI Filter |

Three Phase EMI Filter Models: FIN1700 Three Phase Filter | FIN3755 Three Phase Filter | FIN1700E Three Phase Filter | FIN1200(HV) Three Phase Filters | FIN538S1 Three Phase EMI Filter |

Three Phase Plus Neutral: FIN1240 Three Phase Plus Neutral Filter | FIN1740ESM Three Phase Plus Neutral Filter |

Motor Protection: FINSTP Star Point Snubber | FIN5980P Output Filter | FIN5983 Output Filter | FIN5955 Output Filter | FIN47SNB Snubber Motor Protection for dV/dt | FIN900 Output Filter | FIN905SF Sine Wave Filter |

Passive Harmonic Filter: FINFF Line Reactor 230 Vac | FINHRM5 Passive Harmonic Filter | FINFF Line Reactor 400 Vac | FINFF Line Reactor 480 Vac | FIN950 Line Reactor Filter | FINHRM Passive Harmonic Filter |

Active Harmonic Filter: FINHRMA |

Parallel Filter: FIN730.001.M Three Phase Parallel Filter | FIN740.068.M Three Phase Plus Neutral Parallel Filter | FIN230SP.001.M Three Phase Parallel Filter |

Power Factor Correction: FINSVG Active Static Var Generator |

Voltage Stabilizer: FINSTCA Three Phase Asymmetric Voltage Stabilizer | FINSTCY Three Phase Asymmetric Voltage Stabilizer | FINSTC Three Phase Voltage Stabilizer | FINSMC Single Phase Voltage Stabilizer |

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