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#5923 - 02/19/13 05:12 PM
Doors drift open on a Dover DMC
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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Hi, we've got this side opening car, where when the doors close,and there are no further calls, and dcl is activated, (and pinch torque ceases), the doors just drift back open about 2", until the control sees dcl change states again, then it powers close again. This process repeats until it faults out.
Gravity wants to pull the drive arm vertical, which pulls the doors open. Looked for a slanted track, and dished belts.
Operator is an HD85
Are these types supposed to have pinch torque, when there is no demand?
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#5947 - 02/20/13 04:56 AM
Re: Doors drift open on a Dover DMC
[Re: Johnny]
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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Wow, thanks guys! Great answers...
I adjusted everything as best as I could, got the doors to stay shut. But then they were banging the strike! Did a door learn run, still banging. Increased close slowdown distance, increased final distance, decreased close force at all positions, etc, etc, in other words tried tweaking each and every adjustment available in the close direction that could possibly keep the doors from slamming shut. Tried multiple learn runs, tweaked adjustments ad infinitum. No luck... Never had a DMC do this before, we have always been able to adjust them. In fact on this operator, the open adjustments respond as you would expect, no problem getting the open fine tuned.
It's just like the door operator had no ability to slow the doors down, once they were set in motion, no matter what adjustments were made. I concluded that the door board didn't have the ability electrically to slow the doors in the close direction, once they had been accelerated.
Will try a new board tomorrow, if available.
Last edited by Vic; 02/20/13 04:59 AM.
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#5957 - 02/21/13 05:48 AM
Re: Doors drift open on a Dover DMC
[Re: Vic]
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Joined: Feb 2013
Posts: 4
Rmoore
stranger
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stranger
Joined: Feb 2013
Posts: 4
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Does this car have a Safe edge? It could be the cam that retracts the edge and the heel of the clutch that is causing the doors to drift open. Adjust the roller to stop on the flat spot of the cam, plus angle the cam to force the doors to the close direction.
Stay safe.
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#5967 - 02/21/13 05:11 PM
Re: Doors drift open on a Dover DMC
[Re: Rmoore]
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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Does this car have a Safe edge? It could be the cam that retracts the edge and the heel of the clutch that is causing the doors to drift open. Adjust the roller to stop on the flat spot of the cam, plus angle the cam to force the doors to the close direction. This was a contributing factor to the open drift. Thanks. The safe-edge retractor and clutch retractor work off the same roller. Takes a lot of force to accomplish that. So we made sure it was fully on the flat spot, plus we tilted the flat spot slightly, just to make sure it wouldnt kick open.
Last edited by Vic; 02/21/13 05:16 PM.
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#5968 - 02/21/13 05:13 PM
Re: Doors drift open on a Dover DMC
[Re: Johnny]
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Joined: Apr 2011
Posts: 565
Vic
jack of all depts
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jack of all depts
Joined: Apr 2011
Posts: 565
orange county, CA
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When your doors are completely closed, how close is the operator arm to the top of the shaft on the bullwheel? you should have about 1/8" of shaft showing above the arm. If the arm is below the shaft, the door will drift open. If you shortened the stroke, and increased the length of the arm, you will close in about 120 degrees of bullwheel movement. You should be using about 270 degrees of bullwheel motion. Hmm, ok. I'll take a look at that! Thanks for the info!
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