GaryS
Member
To follow up on the brush change
It was on an M G set (Motor Generator) converts the 2,300 VAC 3 Ph to the 500 VDC to supply the plane variable speed motors. In them days there were no VFD's. I think it was about 500 HP
The brushes of course were on the DC side. And we did it without gloves (couldn't work with gloves)
I think there were some ware around 10-15 brushes in each brush holder so removing 1 would have no effect on the output. And you had to be careful not to drop anything.
The 500 VDC was ungrounded, there was a lot of systems both AC and DC in those days and it was that way on purpose.
I was just starting out and did what I was told and trusted the guys I worked with. I would never do that again I know better now.
They did have one of the first solid-state rectifiers but it was always broken down so the just didn't use it.
Later on I serviced quite a few plants that had 2 phase systems. No not 3 wire single phase as in your house. It had 4 wires and again no ground. All motors were special and no replacements available.
Those were the good old days anybody care to go back to them.
It was on an M G set (Motor Generator) converts the 2,300 VAC 3 Ph to the 500 VDC to supply the plane variable speed motors. In them days there were no VFD's. I think it was about 500 HP
The brushes of course were on the DC side. And we did it without gloves (couldn't work with gloves)
I think there were some ware around 10-15 brushes in each brush holder so removing 1 would have no effect on the output. And you had to be careful not to drop anything.
The 500 VDC was ungrounded, there was a lot of systems both AC and DC in those days and it was that way on purpose.
I was just starting out and did what I was told and trusted the guys I worked with. I would never do that again I know better now.
They did have one of the first solid-state rectifiers but it was always broken down so the just didn't use it.
Later on I serviced quite a few plants that had 2 phase systems. No not 3 wire single phase as in your house. It had 4 wires and again no ground. All motors were special and no replacements available.
Those were the good old days anybody care to go back to them.