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#11170 - 07/01/14 03:31 AM
MCE, IMC randomly latches car calls
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Joined: Jul 2013
Posts: 198
NewMech
member
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member
Joined: Jul 2013
Posts: 198
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I have an MCE IMC controller that randomly latches calls to the fourth and fifth landings. This occurs with no passengers, even with the controller on test.
These landings are secure. To access these floors, you push your desired floor and then press a sequence of buttons on the COP to latch your call. Before your call latches, your desired floor button flashes (for about 15 seconds) as well as the input LED on the HC-CIO board. When the "phantom" calls latch, there is no flashing, they just latch. On my group computer (not sure what MCE calls it) I checked the secure car call log, these phantom calls do not register as being entered. I can sit in the machine room and watch the calls latch on the screen as well as on the HC-CIO board.
I checked all triacs, zener diodes and resistors on the HC-CIO board, all checked fine. I replaced the board with a brand new board from MCE, no change. I have removed and reseated all ribbon cables. I have a new HP-CIO board and ribbon cables on order.
Any other ideas?
Last edited by NewMech; 07/01/14 03:32 AM.
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#11179 - 07/02/14 03:23 AM
Re: MCE, IMC randomly latches car calls
[Re: NewMech]
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Joined: Jan 2014
Posts: 432
Vatorgator
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Joined: Jan 2014
Posts: 432
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is it a single car, or in a group? if it is in a group, check to see if the communication LED on the swing panel for the car you are having trouble with is going out intermittently. If the led goes out, and the car is not communicating to the group, it will start going into a wild car type mode, where it will automatically register car calls and stop at those floors, and continue until the communication is re-established. worth a shot, i had a bad ribbon cable from the comm port board to the swing panel in the car, and the group comm led was out, it would just register random calls until i replaced the cable. just another idea. good luck
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#11193 - 07/03/14 02:55 AM
Re: MCE, IMC randomly latches car calls
[Re: Vatorgator]
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Joined: Jul 2013
Posts: 198
NewMech
member
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member
Joined: Jul 2013
Posts: 198
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is it a single car, or in a group? if it is in a group, check to see if the communication LED on the swing panel for the car you are having trouble with is going out intermittently. If the led goes out, and the car is not communicating to the group, it will start going into a wild car type mode, where it will automatically register car calls and stop at those floors, and continue until the communication is re-established. worth a shot, i had a bad ribbon cable from the comm port board to the swing panel in the car, and the group comm led was out, it would just register random calls until i replaced the cable. just another idea. good luck A fellow mechanic also suggested looking for loss of communication, I did not see this occur.
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#11194 - 07/03/14 02:56 AM
Re: MCE, IMC randomly latches car calls
[Re: gs264]
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Joined: Jul 2013
Posts: 198
NewMech
member
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member
Joined: Jul 2013
Posts: 198
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Is the call dropping when it gets there? or staying on? I have had a lot of issues on a new job with induced voltage. I have also learned to ask for Chris at MCE he is a very sharp guy, even If you have to leave him a message to have him call you back he is worth the wait. I have been mislead by others only to buy more parts it seems. Yes, the call drops. I did speak with Chris, he also suggested looking for induced voltage.
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#11195 - 07/03/14 02:57 AM
Re: MCE, IMC randomly latches car calls
[Re: rac66]
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Joined: Jul 2013
Posts: 198
NewMech
member
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Joined: Jul 2013
Posts: 198
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Have you tried wiring the car calls (4C, 5C) into the hall calls (4U, 5D) instead to see if the phantom calls still register? Should have a board tomorrow, so I will be going back to install the board and measure ribbon cables. I will give this a try.
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#11211 - 07/04/14 01:53 PM
Re: MCE, IMC randomly latches car calls
[Re: E311]
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Joined: Aug 2011
Posts: 563
uppo72
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Joined: Aug 2011
Posts: 563
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Good find, phasing of each car in the group was somthing that used to be done regularly, I still did that when I was in the field. I advise the younger guys to do this when they Mod, even though most of the installation documents we see now don't address this anymore. Hey e311, id like to understand this more. Is this only for the bus supply or for all supplies? I take it the group controller has an output for the bus to each individual lift controller. This would come from the original power supply to the group and then the pcb's split it where it is all needed. So are we just talking about +/- being reversed and thus 180 degree out of phase? What was your process for getting the cars in phase with each other, as I cant say I have ever had to worry about this?
Last edited by uppo72; 07/04/14 01:56 PM.
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#11217 - 07/05/14 01:34 AM
Re: MCE, IMC randomly latches car calls
[Re: E311]
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Joined: Aug 2011
Posts: 563
uppo72
addict
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Joined: Aug 2011
Posts: 563
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Hopefully the 3 phase feeds for each controller come off of the same switch gear. Each controller will use a main transformer supplied buy its individual 3 phase disconnect. This controller transformer will typically take two legs of the 3 phase and convert that voltage to 120VAC for controller voltage. If one elevator is utilizing say, phase #1 and phase #2 of the 3 phase power supply, and the next elevator is utilizing phase #2 and phase #3 for its power supply, you now have a difference of potential between these two controllers. When these two controllers are connected via group connections, you have a doubling of voltage between the shared circuits. Ah thanks mate now I understand what you meant. This is why I haven't come across this as, most of the time if you use a 3 phase step down transformer(ie you use the 3 legs), which we always do, you don't have these issues. Cheers mate.
Last edited by uppo72; 07/05/14 01:36 AM.
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#11218 - 07/05/14 02:47 AM
Re: MCE, IMC randomly latches car calls
[Re: uppo72]
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Joined: Jan 2012
Posts: 885
jkh
4 Ever Learning.
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4 Ever Learning.
Joined: Jan 2012
Posts: 885
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NewMech,
Thanks for keeping us posted. Please let us know how you make out on Monday...
Go Nationals!
Last edited by jkh; 07/05/14 02:50 AM.
Make good choices,
JKH
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