o. THOMPSON LIMIT BOARD TRIPSgreenspun.com : LUSENET : Elevator Problem Discussion : One Thread
JUST TOOK THIS JOB ON MAINTENANCE. O. THOMPSON MICROFLITE ULTRA 2000 CONTROLLER ON A HAUGHTON GEARLESS 500 FT A MIN JOB. INTERMITTENTLY SHUTS DOWN WITH A LIMIT BOARD TRIP FAULT. ALSO SEEMS TO HAVE A LOT OF SPEED DIFFERENTIAL FAULTS, ALTHOUGH THEY DON'T SEEM TO CAUSE SHUTDOWNS. ODDLY THE LIMIT BOARD TRIP FAULTS DO NOT ALWAYS HAPPEN AT A TERMINAL LANDING. THIS IS THE M00352 LIMIT BOARD. ANY HELP APPRECIATED.
-- GARY NEWMAN (GN81953@AOL.COM), March 22, 2004
Which LED is on when the limit board trip? if it isn't happening at terminal floors see if LED #D10 is on,that would mean that it is not receiving a speed feedback signal.
-- Eric Appana (firstname.lastname@example.org), March 23, 2004.
In my limited experience with these things, I've found that the limit board can trip if the elevator clips a door lock, or if the car door switch has been opened during travel, causing an emergency stop.
Hope this helps.
-- Justin Ward (email@example.com), March 24, 2004.
I have had issues with the resistors going out, causing same problems.
-- mike (firstname.lastname@example.org), March 26, 2004.