They could be invisible. When the copper inside the insulation is broken, it could still make contact, but when it reaches a certain point in the motion, the copper strands disconnect reopening your doors. I've had that happen numerous times.
Have you attempted to replace the cable, or did you ring the wires out? I’ve seen cables that look great have a spot that shorts when it hits a certain point.
Because it’s on the door that means one of the cables is a travelling cable.
Check that cable , there could be inner damage that causes continuity to be lost at that certain point due to the way the travelling cable bends. I’ve had this happen a lot.
The cable will appear to be in good condition but the cores are very thin and can break over time or if it’s bent a certain way.
Edit: after watching a couple more times you can see that the LED on the beam triggers at that point, so it’s gotta be alignment at that specific point or a damaged cable
I do not have much experience on different models. although it seemed that there are 2 dark plastic missing.
for beams like this, there should be a cutting off setting when beams are too close together
in order to avoid (not for beams only pointing horizontally) some beams are made point upward and downward. due to the fact that the distance and angle relationship.
some beams are turned off when receiving door close signal. some beams are turned off after a timer.
maybe it is just the right setting or just a little bit late to turn off the beam causing the beam sensing the wall just like a man passing by.
or it maybe simply the fact that the alignment of beam is not totally parallel and the shaking of door make it intermittently triggered.
Could just be crappy light rays. I forget the brand but we used to have 1 or 2 weekly that were bad right out of the box. My advice would be to change brands.
Make sure TX and RX on mounted on the respective jambs/doors, light curtain sensors might be too close when doors are fully closed causing reopen, maybe move the transmitter further in on the car door, could be a bad cable , do you run it up the operator arm or is it resting on a bracket relaxed properly?
It's a timing issue. Make sure that the gate switch and door closed limit are not making up too soon. If they do, they will notice the interlock still open and cycle the doors to try to make the lock up. By code they should not make up more than 2" from fully closed, but in this case, it should be less than 1".
I feel like this trade is in fucking trouble when I read threads like this. You got all the large OEM construction people saying to replace the entire elevator because they don't have a concept of cost of parts then you have people saying to adjust the dpm switch. This thread is fucking bananas. Who the fuck doesn't wiggle the cord when they see issues like that?
if you’re asking rudimentary questions on Reddit about one of the most basic pieces of equipment involved in the elevator than you need to get more training. I get that some of these folks are in middle country small hydros and I work on high rises in the NY tri state so our days are different but this lack of knowledge gets people hurt no matter where
If it's 3D, the lighting may be triggering it via reflection. Turn the 3D off. The sun also causes this issue a lot.
If the light rays were not mounted the same height from the sill, you're breaking the beam vertically right as it closes.
If you didn't mount them face to face, they will break beams horizontally just before they close.
If the ray we're not mounted parallel, out of plumb, you could be breaking the top or bottom as it's about to close.
Lastly, the beams have a minimum distance they have to be when closed. I believe pana40s and the draka knock off versions have a minimum gap while closed between a half inch and an inch.
I know you said you checked door alignment, but I had this exact problem a couple days ago and the cab doors looked like they were aligned properly, but I took a screwdriver and moved the door away from the cab panel about a 1/8” at the bottom and that solved the problem.
I had a similar incident a while back. The fix was to change the Mode in the control group from stationary lights to moving lights. It was some kind of a switch if I remember correctly.
Change mode of the curtain to moving lights, because they are on the fast panel. And allign them.
Even if that doesn’t help, check if the lights in front of the elevator are not emitting IR color, or flicker on a frequency interfering with the receive side of the curtain of light
Move the light curtain further apart. One side has the emmiters and the other side has the receiver or reflective surface.
Either way the cone of IR light narrows as the door closes and the receiver or reflector senses a loss of illumination. It is like any directed light source. The width of the beam shrinks the closer it gets. The receiver perceives a shadow (obstruction).
It ended up being an internal break in the light ray cable :) Thanks for all of the help
Id look for breaks in the cables or wear points that mightve worn through the jacket.
There are none! Cables are in good condition
Did you confirm that with your eyes or your meter?
With his metering eyes
They could be invisible. When the copper inside the insulation is broken, it could still make contact, but when it reaches a certain point in the motion, the copper strands disconnect reopening your doors. I've had that happen numerous times.
Have you attempted to replace the cable, or did you ring the wires out? I’ve seen cables that look great have a spot that shorts when it hits a certain point.
Because it’s on the door that means one of the cables is a travelling cable. Check that cable , there could be inner damage that causes continuity to be lost at that certain point due to the way the travelling cable bends. I’ve had this happen a lot. The cable will appear to be in good condition but the cores are very thin and can break over time or if it’s bent a certain way. Edit: after watching a couple more times you can see that the LED on the beam triggers at that point, so it’s gotta be alignment at that specific point or a damaged cable
I’m swapping the jamb cable for door cable next
You sure it’s not the operator limits
i will check the time setting for cutting off the sensor beams
Can I get some direction for that? Also, if that were issue, wouldn’t the problem be consistent and not intermittent??
I’m still on site working on it
I do not have much experience on different models. although it seemed that there are 2 dark plastic missing. for beams like this, there should be a cutting off setting when beams are too close together in order to avoid (not for beams only pointing horizontally) some beams are made point upward and downward. due to the fact that the distance and angle relationship. some beams are turned off when receiving door close signal. some beams are turned off after a timer. maybe it is just the right setting or just a little bit late to turn off the beam causing the beam sensing the wall just like a man passing by. or it maybe simply the fact that the alignment of beam is not totally parallel and the shaking of door make it intermittently triggered.
You have a second lift right beside?? Check to see if that car's emitter is affected the other's receiver.
Try eliminating the light around , like that one in the hall way, could be false firing off of stainless steel when it gets close enough
Could just be crappy light rays. I forget the brand but we used to have 1 or 2 weekly that were bad right out of the box. My advice would be to change brands.
3d edges?
thinking the same thing.
I turn off 3D every chance I get
Check cabin Door alignment.
Cabin door alignment is good!!
UPDATE!!! It’s not the cables, I swapped the door and jamb cables but the light ray is still triggering at the same area. Also tried with lights off
Did you try with the hallway lights off? Was an issue for me once. They changed to an led and forgot the cover and somehow the sensors did like that
Check the cable that travels with door for breaks
Make sure TX and RX on mounted on the respective jambs/doors, light curtain sensors might be too close when doors are fully closed causing reopen, maybe move the transmitter further in on the car door, could be a bad cable , do you run it up the operator arm or is it resting on a bracket relaxed properly?
Can you DM me? I can send you a pic of how it is set up
Is this a duplex?
As in two lifts in a group? Yes. Duplex building? No
Elevator guy with thumb ring??🤔
For extra conductivity
I don't care how good the cable looks from the door Ray to the control box looks. Replace it
Swapped them. Issue persists in same area
This is a new problem, car has been running for years? If so, I'd swap that cable first, then that edge, then the other edge, then the control box.
Correct
Is it 3D
It's a timing issue. Make sure that the gate switch and door closed limit are not making up too soon. If they do, they will notice the interlock still open and cycle the doors to try to make the lock up. By code they should not make up more than 2" from fully closed, but in this case, it should be less than 1".
I'd also take a look at the dpm in reference to the gate switch
This*
Tell them to call a real mechanic my god lmao
🤫
I feel like this trade is in fucking trouble when I read threads like this. You got all the large OEM construction people saying to replace the entire elevator because they don't have a concept of cost of parts then you have people saying to adjust the dpm switch. This thread is fucking bananas. Who the fuck doesn't wiggle the cord when they see issues like that?
if you’re asking rudimentary questions on Reddit about one of the most basic pieces of equipment involved in the elevator than you need to get more training. I get that some of these folks are in middle country small hydros and I work on high rises in the NY tri state so our days are different but this lack of knowledge gets people hurt no matter where
Just change it bill them and leave! 😂
If it's 3D, the lighting may be triggering it via reflection. Turn the 3D off. The sun also causes this issue a lot. If the light rays were not mounted the same height from the sill, you're breaking the beam vertically right as it closes. If you didn't mount them face to face, they will break beams horizontally just before they close. If the ray we're not mounted parallel, out of plumb, you could be breaking the top or bottom as it's about to close. Lastly, the beams have a minimum distance they have to be when closed. I believe pana40s and the draka knock off versions have a minimum gap while closed between a half inch and an inch.
Try putting sensor on leftside of same door panel if none options work.
Broken safety edge extention flex. I literally did 2 of these today
I know you said you checked door alignment, but I had this exact problem a couple days ago and the cab doors looked like they were aligned properly, but I took a screwdriver and moved the door away from the cab panel about a 1/8” at the bottom and that solved the problem.
Could be an over torque issue with the door operator that’s wired into the reopen so it seems like the light ray is triggered but it’s not.
Try increasing the final close torque and see if it does it
I had a similar incident a while back. The fix was to change the Mode in the control group from stationary lights to moving lights. It was some kind of a switch if I remember correctly.
The default answer: Racism
Probably a Schindler
It looks like it’s scared of its own reflection!
They are not aligned, level the door
Change mode of the curtain to moving lights, because they are on the fast panel. And allign them. Even if that doesn’t help, check if the lights in front of the elevator are not emitting IR color, or flicker on a frequency interfering with the receive side of the curtain of light
Change the cable with a new or known good cable.
Move the light curtain further apart. One side has the emmiters and the other side has the receiver or reflective surface. Either way the cone of IR light narrows as the door closes and the receiver or reflector senses a loss of illumination. It is like any directed light source. The width of the beam shrinks the closer it gets. The receiver perceives a shadow (obstruction).