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Topic starter
25/07/2010 12:48 am
Hey Everyone, about every 2 weeks one of my cars is found stuck about 1 foot above the first landing. EME is out and EAO is lit on the pattern board. Also, when the car fails it has an up direction maintained. However, the EAO relay is not latched. The elevator will go back in service by simply hand picking EME or by opening the hall doors causing LG to drop which also creates a path to pick EME. The hall door locks and car gate contacts have been thoroughly check and should be good. Any ideas?
26/07/2010 8:51 am
are you still having this issue?
26/07/2010 10:44 am
I would swap the amplifier board with another car, i have had intermittent eao problems before, usually eao trips if the car speed is above 150 fpm either in leveling or on inspection. you could have a bad amplifier board, it could also be a bad lu ld inductor, or traveling cable wire for lu or ld, you could be opening the safe circuit and then remaking causing the same problem. also lastly try swapping pattern board with another car. maybe the car is going to inspect mode due to a traveling cable also. good luck
29/07/2010 9:42 am
Is the car always shut down at the first floor with an up direction? Couple of ideas in addition to Scott's ideas. Check the LRA relay to see if it buzzes a lot when the generator first turns on. The audio noise from this relay will sometimes cause an EAO event and drop EME. Also check AM contact 5 and M contact 13-14 if my memory is right. These contacts are large for the circuit they are in. This is basically your "go" signal to the regulator. The problem is that the 24 volt inputs into the PATT and Amp board don't draw much current. This the case for U, D 13-14 as well as the EME contact 13-14 which are also inputs into the electronic speed control. One of the fixes for these input problems is to load the contact with about a 200 ohm 10 watt resister to SBW. This forces the contact to draw more current and thus become more reliable. Haughton Goldflite has movs that need replaceing on all the E type relays. They are most likely there but are doing nothing due to their age.
Topic starter
29/07/2010 1:42 pm
The car is always about a foot or 18" above the the first landing. It never fails during the day and it never occupies a passenger. It is always found failed in the morning when the building opens. It must be failing upon starting the generator after shutting down at night. I will verify the contacts you have suggested and post my findings. Thanks for the tips everyone!