- Location
- Windsor, CO NEC: 2017
- Occupation
- Service Manager
Assuming a Danfoss VLT HVAC drive FC102 is driving a stairwell pressurization fan that has two belts: how would you determine that one of the redundant belts has come off its pulley?
The load wouldn't change all that much, right? So the VFD wouldn't really notice a decrease in the amount of energy expended turning the motor?
A CT monitoring the circuit would be useless, as the fan motor would be constantly changing speed attempting to fine tune the pressurization in the stair tower as doors are opened and closed, right?
Is the inspector asking for a bar of Unobtainium? :huh:
The load wouldn't change all that much, right? So the VFD wouldn't really notice a decrease in the amount of energy expended turning the motor?
A CT monitoring the circuit would be useless, as the fan motor would be constantly changing speed attempting to fine tune the pressurization in the stair tower as doors are opened and closed, right?
Is the inspector asking for a bar of Unobtainium? :huh: