Home Forums General Discussion Technical Questions Tach 20 shutdowns

Got a tach 20 randomly shutting down. Seems to happen most after its sat for awhile(over night). Only fault is 1078. Changed battery. When it shuts down it kills solid state starter. Which I see is controlled my mcc1 relay. Any suggestions?

The Valve may not be sized correctly. When the unit goes to heat the cold oil it moves the car, causing it to go down on low oil time. Or the cold oil thermostat isn't working. allowing the oil to get too cold and when it goes to re-level it goes down on low oil time. Just something to check

What about the CPU? Could it be failing? How many batteries have you changed?

Does anyone know where to get an open ims tool

Does it have battery lowering? If so, next time you get this call, unplug and re-plug just the battery back up and see if your controller come back to life. If this is the case, replace the battery or batteries in the UPS.

I have changed the battery in the cpu card with a new one and it is still shutting down

It does not have battery lowering. I adjusted the bypass(low pressure) port per manufactures recommendations to rule that out but it still shutdown. I will check into the cold oil therm. thanks

I did see it fail. It lowered to the bottom to warm the oil and the motor energized for a second and kicked off then energized then kicked off then the controller shutdown the solid state starter. (New Solid State Starter which was replaced after the problems started)

Check your up to speed contact on your soft start. When the Tac20 faults out it kills the control power for the soft start. So you can never tell what fault the soft start has.

Boy this thing is being a pain. Ok I haven't dropped the soft start in awhile but its still faulting out. getting faults 1087, 1009, and the 1078

magnets are good and in place

What relays are in the MCD MCE circuit?

Local

Have you checked the valve? With a pressure gauge on the valve, turn the power off and close the shut off valve to the jack. Are you losing pressure? When the unit is trying to warm the oil, could the car be drifting down? If you feather the manual lowering will it fail and give you the same faults? What about re-leveling? Is it always at the bottom floor?

Johnjays first post was pointing in this direction. I seem to remember this type of trouble. Just wish my memories were clearer.

Forgot this was still an issue. I will look into it tomorrow and post.

Local the 1078 is a low RAM battery fault. The other 2 faults are MCD and MCE contactor faults. CPU could be the culprit here with that bad battery. Start there, the MCD and MCE are both on the first or second page of the prints, 2 AC relays I believe, EPEN I think is the one I would start with.

Also worth noting, the Siemens starter board has a very short life span. I give those boards to service guys as soon as I get them, the 7-8 normally closed ready, and 9-10 normally open ready fail. TKE used to repair them, bad resistor if I remember correctly, but has found its actually just cheaper to swap for new.

Holler back if this didn't help you get on the right page to fix it, I am on TAC 32's now for new installs, but I can swing by an old 20 and look some stuff up if you need it.

Forgot to ask, does this elevator have UPS for the battery backup? I have heard of a few ghost faults when these batteries begin to go bad.

What relays are in the MCD/MCE circuit? I think all eight at the lower right hand side of the main controller board. Are the relays a blue color? Problematic if so.

yes they are blue. I seen on around page 12 what they are. All the valve pilot relays and muts. ordered all new relays for controller. will see if this takes care of it. if not i will replace cpu card

Yeah the finder relays were garbage, started at like K-7 and worked its way up to 12? Before changing the CPU shout back. I might have a few more tricks up my sleeve by then, and I am assuming you check the battery by now.

Change all the relays at the bottom of the controller board, that's the
Problem. Use the Schrack, make sure you use the retaining clips too. ( very important)

I changed all the finder relays for the schrack. Been running for over a week without out any shutdowns. It had to be reset at least once a day before the relay replacement. Think this may have did it. Thanks all for your input