Janson Controls FC100 Series, Manual, Page: 107 / 108

( 7 ) Inverter may interfere with other devices .
Causes and corrective actions :
The input / output ( main circuit ) of the inverter includes high frequency components ,
which may interfere with the communication devices used near the inverter . In this
case , set EMC filter valid to minimize interference .
a : Decrease carrier frequency ( P115 ).
b : Install a noise filter on the inverter output side to reduce the
electromagnetic nois generated from the inverter .
c : Install a noise filter on the inverter input side .
d : For reduction of induction noise from the power line of the
inverter . it is recommended to wire the earth cable by returning it to
the earth terminal of the inverter .
e : To prevent a malfunction due to noise , keep the signal cables more than 10cm away
from the power cables , f : Control circuit cable should use shielded cable , and the
cable should be installed in metal tube
8 - 5 Inverter - generated noises and their reduction techniques
Some noises enter the inverter to malfunction it and others are radiated by the
inverter to malfunction peripheral devices
. Though the inverter is designed to be
insusceptible to noises , it handles low - level signals , so it requires the fllowing basic
techniques . Also , since the inverter chops outputs at high carrier frequency , that
could generate noises . If these noises cause peripheral devices to malfunction ,
measures should be taken to suppress noises . These techniques differ slightly
depending on noise propagation paths .
1 , Basic techniques
• Do not run the power cables ( I / O cables ) and signal cables of the inverter in parallel
with each other and do not bundle them .
• Use twisted pair shielded cables for the detector connection and control signal
cables , and connect the sheathes of the shield cables to terminal SC .
• Earth the inverter , motor , etc , at one point .
2 , Techniques to reduce noises that enter and malfunction the inverter
When devices that generate many noises ( which use magneticcontactors ， magnetic
brakes , many relays ， for example ) are installed neat the inverter and the inverter
may be malfunctioned by noises , the following measures must be taken :
Provide surge suppressors for devices that generate many noises to suppress
noises .
• Fit data line filters to signal cables .
• Earth the shields of the detector connection and control signal cables with Cable
clamp metal .
8
107
Chapter 8 Troubleshooting and Fault Informatin
FC100 Series User Manaul