I'm having a strange problem with an electrified monorail consisting of several trolleys on a 1/4 mile loop.
This monorail runs 24/7, Powered by 480 3phase.
The Problem: Every Monday morning at 6:36, 7:06 or 7:36 the monorail E-stops. The only way to E-stop this monorail is by hitting one of several E-stops, leaving a gate open or opening a door( that is an E-exit).
One other way to cause an E-stop is if the 3 phase drops and the saftey contacters drop out.
I was involved with the building and commissioning of the monorail and know that there is NO way any of the PLC's could be causing this. (even though my customer disagrees)
I have a feeling somewhere at the customers site between 6:36 - 7:36am there is something large turning on and in turn causing the 480vac to dip just long enough to kill the 24vdc power supply (supplied by the 480) in turn dropping the safety relays.
Does this seem possible? Is there some way to capture a voltage drop on the 3 phase?
This monorail runs 24/7, Powered by 480 3phase.
The Problem: Every Monday morning at 6:36, 7:06 or 7:36 the monorail E-stops. The only way to E-stop this monorail is by hitting one of several E-stops, leaving a gate open or opening a door( that is an E-exit).
One other way to cause an E-stop is if the 3 phase drops and the saftey contacters drop out.
I was involved with the building and commissioning of the monorail and know that there is NO way any of the PLC's could be causing this. (even though my customer disagrees)
I have a feeling somewhere at the customers site between 6:36 - 7:36am there is something large turning on and in turn causing the 480vac to dip just long enough to kill the 24vdc power supply (supplied by the 480) in turn dropping the safety relays.
Does this seem possible? Is there some way to capture a voltage drop on the 3 phase?