Azbil DCP31 - Noise Generating Sources and Countermeasures

3-4
Chapter 3. MOUNTING
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Noise generating sources and countermeasures
• Generally,thefollowinggenerateelectricalnoise:
(1) Relaysandcontacts
(2) Solenoidcoils,solenoidvalves
(3) Powerlines(inparticular,90Vacmin.)
(4) Inductionloads
(5) Inverters
(6) Motorcommutators
(7) PhaseanglecontrolSCR
(8) Wirelesscommunicationsequipment
(9) Weldingequipment
(10)High-voltageignitionequipment
• Iftheinfluenceofelectricalnoisecannotbeeliminated,werec-
ommendtakingthefollowingcountermeasures:
 -ProvisionofaCRfiltersforfast-risingnoise
RecommendedCRfilter:
 AzbilCorporationModelNo.81446365-001
 -Provisionofavaristerfornoisewithahighwaveheight
Recommendedvarister:
 AzbilCorporationModelNo.81446366-001(100V)
81446367-001(200V)
Handling Precautions
• The varister may become short-circuited when trouble occurs.
Pay attention to this when providing a varister on a controller.
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Dust-proof cover
Usethedust-proofcoverwhenusingthecontrollerinadustyor
dirtylocation,andtopreventinadvertentoperation.
Twodustproof-coversareprovided,hardorsoft,eachwiththefol-
lowingdifferingfunctions:
Type Conrmation on Display Operation
Hard
Soft
indicates that a function can be used.