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Forums13
Topics6,507
Posts36,838
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Most Online117 Jan 16th, 2020
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#23270 - 03/01/18 03:04 AM
Re: DMC up fast coil
[Re: solidstate]
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Joined: Dec 2015
Posts: 1,537
Indirtwetrust
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,537
Local 18
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Did you replace all the relays with the relay board? Check where the wires go into the valve coils (fast and slow). They get brittle and can become intermittent. Make sure the up level strainer is clean. If the problem is intermittent, reading continuity means nothing. Pull the switch tree, clean the contacts, inspect the wires thoroughly. Breaks inside the wires are common. Cut, strip and re-terminate the wires in the screw terminals. I just recently had a bad connection there, the bare wire was under the terminal, it was tight, wouldn’t pull out but was just not conducting. I’ve also seen the MTA plugs from the switch tree to selector cause MLTs. Motor thermal and overtemp switches. You have to be thorough or these can get out of hand. Any info you can get from customer or other mechanics will help a lot. Was the motor running, does the car move, if so where does it stop, etc.
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#23279 - 03/01/18 07:56 PM
Re: DMC up fast coil
[Re: solidstate]
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Joined: Feb 2013
Posts: 759
john jay
old hand
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old hand
Joined: Feb 2013
Posts: 759
ohio
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When you get back to the job, a couple of things to try. AC2 is the ground side of the circuit. Did you try going to a known ground instead of AC2 with your meter, if you still don't have a voltage you have eliminated that side of the line and can concentrate on the hot side.When you say you are getting a proper voltage across TSL3 and AC2, you should not read a voltage there unless you are reading from the AC1 side of the circuit to them. If you are reading a voltage across TSL3 and AC2 that is showing an open circuit there.
Last edited by john jay; 03/01/18 08:04 PM. Reason: bad number
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#23291 - 03/03/18 12:48 AM
Re: DMC up fast coil
[Re: solidstate]
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Joined: Dec 2015
Posts: 1,537
Indirtwetrust
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,537
Local 18
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I’m sorry, I assumed you were having intermittent MLT problems. Are you saying the car won’t run up at all? Do you have a set of prints? With the meter on AC, before trying to run, read from AC1 to AC2, you’ll read 120 vac, now read from AC1 to TSL3. If you still have 120 vac you have verified the TSL3/TSL4 Contact is good (you will also have TSL input high.) now clip one lead on TSL3 and give the car an up call. You should read 120 vac at MS1 since the pump is running. Now read MS2, if you lose voltage here check the aux contact on Delta. Now read voltage at UTS1, if you lose voltage here, it could be FST, DN2, or UP1 Relay contacts. If you do have UTS1, UTS input will be high, now check voltage at TSL2, if you lose voltage here, the problem is in the switch tree, UTS or TSL switch or wiring. If you do have 120 vac from TSL2 to TSL3 then you should have 120 vac from UFS1 to UFS2 and the up fast coil should be picked. If your problem is in the switch tree, pull the CS6 MTA plug from the selector and clip your leads from pin 11 to 15, put the meter on audible continuity, pull the tree up on the car and open up the UTS and TSL switches.
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