Hi all,
I have lurked on this forum for many years... And the wealth of information is truly astounding. I have run into a problem with our shops HLV-H that I hope I can get pointed in the right direction with.
The lathe is a Hardinge HLV-H wired for 460v 3ph and powered by our shops 480v 3ph service.
I used the lathe on a Friday and it worked fine, but when I tried to use it on Monday it was completely dead. Over that weekend we did have some fairly decent thunderstorms in the area.
I checked all of the fuses and one of the low voltage fuses was blown. I installed a new fuse and the machine ran for about 15 seconds and blew the new fuse. I checked the ground connection and did a general once over of the mass of wiring (which just looks like wire spaghetti to me) and tried another fuse. Same result except this time I smelled electrical burning.
I did some basic continuity checks and found that the line side of the fuse socket in question has continuity to ground. The load side does not. The fuse socket's load side goes up to the on and off switches and then down to several relays or contactors (I don't know what they are to be honest.)
The Line side of the socket is fed directly from the "X2" (wire is also marked X2) position on the transformer. The transformer indicates that should be 110V output. I put the multimeter across the X2 output lug and a lug right next to it which is wired to ground and there was continuity / 1.2 Ohms resistance.
I'm no electrician but it seems to me like a hot leg from the transformer should not have continuity to ground?
Also a few of the relays/contactors have some burnt spots which may just be from use and age? I really don't know.
I am not opposed to calling someone in to the shop to get this problem sorted but I really don't know who to call... Anyone know what type of electrician does that work?
Thanks for any help or tips!
I have lurked on this forum for many years... And the wealth of information is truly astounding. I have run into a problem with our shops HLV-H that I hope I can get pointed in the right direction with.
The lathe is a Hardinge HLV-H wired for 460v 3ph and powered by our shops 480v 3ph service.
I used the lathe on a Friday and it worked fine, but when I tried to use it on Monday it was completely dead. Over that weekend we did have some fairly decent thunderstorms in the area.
I checked all of the fuses and one of the low voltage fuses was blown. I installed a new fuse and the machine ran for about 15 seconds and blew the new fuse. I checked the ground connection and did a general once over of the mass of wiring (which just looks like wire spaghetti to me) and tried another fuse. Same result except this time I smelled electrical burning.
I did some basic continuity checks and found that the line side of the fuse socket in question has continuity to ground. The load side does not. The fuse socket's load side goes up to the on and off switches and then down to several relays or contactors (I don't know what they are to be honest.)
The Line side of the socket is fed directly from the "X2" (wire is also marked X2) position on the transformer. The transformer indicates that should be 110V output. I put the multimeter across the X2 output lug and a lug right next to it which is wired to ground and there was continuity / 1.2 Ohms resistance.
I'm no electrician but it seems to me like a hot leg from the transformer should not have continuity to ground?
Also a few of the relays/contactors have some burnt spots which may just be from use and age? I really don't know.
I am not opposed to calling someone in to the shop to get this problem sorted but I really don't know who to call... Anyone know what type of electrician does that work?
Thanks for any help or tips!
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