Steve Etter
Lifetime Supporting Member + Moderator
Alright....another safety issue......
With the improvements we have all seen with the implementation of Ground Fault Interupts for AC circuits, one thing I haven't really seen is how one should create a GFI circuit for DC circuits.
The specific application I have is a machine in a "wet" enviroment where the manufacturer is recommending 1/2 HP, 90VDC motors on the conveyors. Because there is a real safety concern in the environment, how should the DC side of the system be protected?
Also, since the DC system has variable speed from 0 to 100%, one of our guys has also brought up the question of whether any GFI system would be effective down in the lower speeds since armature current and voltage can be very low.
Yes, for those of you who wonder, the AC side of the machine is already being designed with GFI protection.
Steve
With the improvements we have all seen with the implementation of Ground Fault Interupts for AC circuits, one thing I haven't really seen is how one should create a GFI circuit for DC circuits.
The specific application I have is a machine in a "wet" enviroment where the manufacturer is recommending 1/2 HP, 90VDC motors on the conveyors. Because there is a real safety concern in the environment, how should the DC side of the system be protected?
Also, since the DC system has variable speed from 0 to 100%, one of our guys has also brought up the question of whether any GFI system would be effective down in the lower speeds since armature current and voltage can be very low.
Yes, for those of you who wonder, the AC side of the machine is already being designed with GFI protection.
Steve