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SECTION 6 TROUBLESHOOTING
6.3 Fault Isolation
Manyofthemostcommonproblemsarelistedbysymptom.
6.3.1 Nooutputwithcontactorsignalapplied
6.3.2 Outputlimitedto100A
6.3.3 Fansnotworking
6.3.4 Powernotonorlowvoltage
6.3.5 Faultlightillumination
6.3.6 Torchwon’tre
6.3.7 Fussesblown-F1andF2
6.3.8 Intermittent,interruptedorpartialoperation
6.3.3 Fans Not Working
Problem Possible Cause Action
All4fansdonotrun
Thisisnormalwhennotcutting.
Fans run only when “Contactor On”
signalisreceived.
None
1,2or3fansdonotrun.
Broken or disconnected wire in fan
motorcircuit.
Repairwire.
Faultyfan(s) Replacefans
6.3.1 No output with contactor signal applied
Problem Possible Cause Action
Contactor signal is applied,
contactor lamp on front
panelisilluminated,K2and
K3 contactors do not close
andlowbus faultlight,LED
5illuminates.
External emergency stop (E-stop) is
open.
ConnectisolatedcontactofE-stopswitchtopro-
videconnectionbetweenJ1-EandJ1-F.
E-stopbuttononfrontpanelispushed
in.
TwistandpullouttoresetE-stopcondition.
Powerresetlamponfrontpanelindi-
catesaseriousfaultcondition.
Refertosectionunderfaultlightillumination.
6.3.2 Output limited to 100A
Problem Possible Cause Action
Powersourcewillnotgoover
100A.
Highcurrentrangesignalmissing.
ExternalcontrolshouldconnectJ1-RtoJ1-T.As
analternative,inthepowersource,movethered
wireonTB8-1toTB8-2.