Chris Hall
Cast Iron
- Joined
- Feb 28, 2013
- Location
- Greenfield, MA
I'm converting my Hitachi bandsaw from singe phase to three phase using all factory parts. This is a 4-wire, 3 hots and ground. The push-button, non-momentary switch looks like this:
On the back, you can see the terminals:
This brings us to where I am a bit puzzled. You can see by the faintly visible numbers that the left side is marked 1-2-3, while the right side is 4-5-6. I have three leads coming in, and three leads coming out, but are you supposed to connect the leads to those middle (2 and 5) terminals? The three phase on/off switches I have used previously all had three pairs of connection inside, but this one appears to have two.
I have the impression that the idea with this switch then is to switch only 2 of the three leads. That is, one lead going to the switch would connect through 1 to 3, and the second lead 4 to 6.
But, if one of the leads is un-switched and is always sending current to the motor, with the other two off, then does this affect the motor in some way or not? I know it won't start with one lead, but not sure the affect otherwise.
If connecting one of three leads to the motor and switching the other two would be bad for the motor, then how is one to connect three incoming leads to such a switch, and then three outgoing ones, using only 4 connection points?
On the back, you can see the terminals:
This brings us to where I am a bit puzzled. You can see by the faintly visible numbers that the left side is marked 1-2-3, while the right side is 4-5-6. I have three leads coming in, and three leads coming out, but are you supposed to connect the leads to those middle (2 and 5) terminals? The three phase on/off switches I have used previously all had three pairs of connection inside, but this one appears to have two.
I have the impression that the idea with this switch then is to switch only 2 of the three leads. That is, one lead going to the switch would connect through 1 to 3, and the second lead 4 to 6.
But, if one of the leads is un-switched and is always sending current to the motor, with the other two off, then does this affect the motor in some way or not? I know it won't start with one lead, but not sure the affect otherwise.
If connecting one of three leads to the motor and switching the other two would be bad for the motor, then how is one to connect three incoming leads to such a switch, and then three outgoing ones, using only 4 connection points?