Mce scr drive

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#26175 - 03/11/19 09:11 PM Mce scr drive
Joined: Jan 2014 Posts: 13 mar stranger
mar stranger Joined: Jan 2014 Posts: 13 wash dc northern va	Getting intermittent insufficient DC loop current feedback faults any ideas already adjusted tp3 test point to ground for 0 millivolts changed scr pri board

#26176 - 03/12/19 12:26 AM Re: Mce scr drive [Re: mar]
Joined: Dec 2015 Posts: 1,536 Indirtwetrust ElevatorPractitioner
Indirtwetrust ElevatorPractitioner Joined: Dec 2015 Posts: 1,536 Local 18	Check the brushes, rigging, & connections

#26284 - 03/23/19 02:22 AM Re: Mce scr drive [Re: mar]
Joined: Jan 2014 Posts: 13 mar stranger
mar stranger Joined: Jan 2014 Posts: 13 wash dc northern va	Changed scr pri board right above drive and p4 relay my problem has home away

#26301 - 03/25/19 06:52 PM Re: Mce scr drive [Re: mar]
Joined: Jan 2014 Posts: 13 mar stranger
mar stranger Joined: Jan 2014 Posts: 13 wash dc northern va	Correction that was the pt4 relay right next to my scr pri board causing all my intermittent problems

#26353 - 03/31/19 01:41 PM Re: Mce scr drive [Re: mar]
Joined: Jan 2015 Posts: 117 Turbo6 member
Turbo6 member Joined: Jan 2015 Posts: 117 Chicago	Motor field voltage will also cause this. Try bumping voltage up slightly, also a current sensor going bad will cause this.

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