Today we received an interesting request: a conveyor belt that stops for no apparent reason.
The operator said the typical thing: “It just shuts off,” without any alarms or messages. So we started with the basics…
First: power and protection.
Circuit breakers, thermal relays, and the main contact.
If any of these are tripping due to overload or a loose connection, that’s where the first clue lies. Silent failures almost always start here.
Second: the VFD or starter.
Even if it doesn’t display any faults on the screen, the parameters always tell the truth. Overcurrent, temperature, undervoltage, or starting spikes that shouldn’t be there… if something’s wrong, the drive registers it.
Third: sensors and stop logic.
A loose limit switch, a dirty sensor, or a loose cable can send a false “stop” signal without anyone noticing.
The silent culprits reside in the logic.
And finally: load testing.
This is where we confirm whether the problem is electrical, mechanical… or a fairly common combination.
A conveyor belt working at its limit will eventually shut down, with or without an alarm.
What do you think?
Where do you think the fault would be in this case?
