Elevator Forum

Wow good find. We had many old montgomery vv jobs up here with floating grounds. All of them were required to have engineered GFCI's installed in the ...

If possible get your customer to check his original specs on the job. If the job was spec'd by a consultant or sold as non-proprietary they should be ...

Wow has it been this long? Where have i been? What have I been doing? Service work, safety tests, replacing a step chain and steps on an escalator, th...

Good idea to always replace the power and speed control as a pair. When the darlington fails it can output full potential and will slam the doors open...

Yellow Jumper near top of board Blue Jumpers on resistors Blue Jumpers on Chip Processor Last edited by rollaway-up; 06/17/14 05:11 AM.

I found the rv input relay, yes very hard to notice velcro'd deep in the cop. It has 3 teeminals going in one side, one wire coming out the opposite e...

Replaced the power supply and the tone board and still no success. On the old processor board there are external jumpers made of wire that join certai...

I would try making sure that the interconnection between the ebcoms is consistent with the print, i've repaired a new install that had the signal wire...

Well my hopes of the interface board failed miserably today. Looks like upon further investigation my power supply is outputting 12v and 12v instead o...

Yes i enjpyed that thread too! Lots of good info here.It was taking car calls and travelling to the appropriate floors, i left it running on independe...

Well the new cpu solved the problem, but i ended up having to replace the relay board too to get it running. Now all the hall calls are lit up and the...

Ok sounds like you're doing the right things, ill have to think some more.

The resolver keeps absolute position of the shaft in relation to the magnets so the drive can give the necessary output.Check to make sure LEDS TPOL a...

Guys, great information thanks.When i compared them, the only visible difference was the diode was missing the polarity stripe, if it was a jumper, th...