20hp motor Ground Fault Protection
20hp motor Ground Fault Protection
(OP)
We have some critical 20hp motors. The motor starters have a MCP (motor circuit protector), NEMA Contactor and bi-metallic overload relay without any ground fault protection. I want to change the bimetallic overload relay with electronic overload relay that comes with ground/jam protection module.
The problem is in case of ground fault, the new ground fault module, how it will trip the motor? Can I open the contactor under ground fault? What is the optimum solution?
The problem is in case of ground fault, the new ground fault module, how it will trip the motor? Can I open the contactor under ground fault? What is the optimum solution?






RE: 20hp motor Ground Fault Protection
RE: 20hp motor Ground Fault Protection
Are you thinking Ground Fault Protection in an SSOL is the same as a GFCI used to protect people from shock? Because if so, you are incorrect. Anything you get for a 3 phase motor will be Ground Fault Protection for EQUIPMENT only. It's not the same.
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: 20hp motor Ground Fault Protection
RE: 20hp motor Ground Fault Protection
Unless you are using DeviceNet, don't use an E3, use the new E300 instead. The E3 is moving to the status of being sold for replacement purposes now that the E300 is fleshed out (other than the DeviceNet interface for it not being ready yet).
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: 20hp motor Ground Fault Protection
Is your power system solidly grounded, ungrounded, or (preferably) hi-resistance grounded?
GG
I am forever learning and changing.
W.E. Deming