ESAB Plasmarc EPP-450 User Manual

59
SECTION 6 TROUBLESHOOTING
6.8 Arc Current Detector Circuits
TherearethreeArcCurrentDetectorcircuitsintheEPP-450.OneisusedinternallytocontrolthePilotArcContactor,K4.
Theothertwoareavailableforremoteuse.
AgalvanicallyisolatedtransistorCurrentDetectorOutputisaccessibleatJ1-G(-)andJ1-P(+).J1isthe24conductorcon-
nectorontheEPP-450frontpanel.Thetransistorisbestsuitedforswitchingsmallrelaysorlowcurrentlogicsignalslike
thoseutilizedbyPLC’s(ProgrammableLogicControllers).Thetransistorcanwithstandamaximumpeakvoltageof150V.
Itcanswitchamaximumof50mA.ThetransistorturnsonwheneverthearccurrentthroughtheWorkLeadexceeds3A.
Pilotarcsnotestablishingmainarcswillnotturnonthetransistor.
AsecondcurrentdetectoroutputisavailableatTB8-3andTB8-4.Thisoutputissuppliedbyanisolatedrelaycontactrated
for150V,3Amperes.ThiscontactisclosedwhentheprimaryinputpowertotheEPP-450iso.Itopenswheneverprimary
powerissuppliedtothepowersource,anditcloseswhenmainarccurrentisestablished.Likethetransistoroutput,the
relaycontactcloseswheneverthearccurrentthroughtheWorkLeadexceeds3A.Pilotarcsnotestablishingmainarcswill
notclosethecontact.
J6-DJ6-EJ1-GJ1-P

ESAB Plasmarc EPP-450 Specifications

General

Brand	ESAB
Model	Plasmarc EPP-450
Category	Welding System
Language	English