Siemens TEC resetting itself every 30-40 seconds

[SMorrison78]

I have a newly installed Siemens TEC, application 2050 that is resetting itself every 30 to 40 seconds on average.....it loses connection with insight and physically powers itself off and then back on. What would cause it to do this?

[dingman]

Disconnect all the inputs\outputs except power. If it still does it, replace the TEC. If it stops, inspect wiring\devices.

[Jbart]

All connections are tight? Is your FLN T-tapped? Did you replace an existing or add a new one? Did you change application?

[khumphreys]

Had this problem before. The newer TEC's have a ground terminal for power and the installer actually hooked it up. Seems like I unhooked this ground and it started working. Older units did not have this terminal. See if that helps

[air1]

Try disconnecting the TEC from the FLN. If it stops reseting then you have a network problem. Check for duplicate FLN addresses or incorrect FLN wiring.

[chesehd]

I had something similar happen years ago with a fan-powered VAV. There was a dead spot on the fan windings that would cause the source voltage to drop when the fan failed to move. This caused the TEC to reset, DO6 turned off, killing the fan call, allowing the voltage to climb back to normal, TEC resets, calls for fan to run, cycle repeats forever.

Can you put an analog meter, not digital, on the TEC power and watch what happens? The DVOM may not respond fast enough to see the drop happen that fast is why I specified analog. Or, perhaps you could install a tattletale relay on the TEC power leg, just to see if it drops or not.

Good luck!

Ken

[dingman]

Had this problem before. The newer TEC's have a ground terminal for power and the installer actually hooked it up. Seems like I unhooked this ground and it started working. Older units did not have this terminal. See if that helps

This is correct.