rons
Diamond
- Joined
- Mar 5, 2009
- Location
- California, USA
That would work. Someday after you buy it you may look inside and say "I could have built this, why did I buy it?"
Save yourself the trouble and build it now.
Largest Manufacturing Technology Community on the Web
Stay Connected:
VFD for Hardinge DSM-59
- Thread starter Ronno6
- Start date
- Replies 28
- Views 745
Save yourself the trouble and build it now.
With regard to the previous question, you can't just pull a 115 leg off of the output of a VFD (I don't know the specific technical details, but I don't think there's a true 115 volt leg to ground available, and the VFD does various monitoring of the single output; i recall reading the reasons long ago but have forgotten). And wiring separately from an available 115 source with a VFD would require rewiring/reconfiguring of the controls on the lathe. So usually, people only pursue that in the event they want to replace the 3p motor altoghether, or the electrials have been modified already. Also, in the HLVH lathes, the spindle motor is a specially balanced behemoth for its HP, and may also be in the DSM. Again, the RPC is plug and play if controls haven't been compromised.
To Ron's point, yea a RPC is pretty simple, but time, safety, support and avoiding screwups is worth something; by the time you educate yourself to build one, buy the parts (motor, caps, wire, switches, relays, boxes etc), you're probably into it for around half the cost of just buying the kit, then there's one's time, support, possible exciting sparks, and electrocuting oneself if not familiar and careful. Cheers
Last edited:
There is no 115V to ground from any VFD. In most cases, the voltage to ground is not a constant, because of the way VFDs work.
You "could" get a 115 output from a transformer, BUT, you would have to not use the "variable frequency" feature. You would have to just use the VFD as a 3 phase converter, and you would need to oversize it significantly to handle the motor start surge.
At that point, you may as well use an RPC, or, for some usages, a Phase-Perfect.
You "could" get a 115 output from a transformer, BUT, you would have to not use the "variable frequency" feature. You would have to just use the VFD as a 3 phase converter, and you would need to oversize it significantly to handle the motor start surge.
At that point, you may as well use an RPC, or, for some usages, a Phase-Perfect.
3 phase uses no capacitors. It is self-starting.
Almost certainly induction, that is still the most common type. Got a pic of the tag?
You should start a new thread for this sort of question. Please do.
pan60
Cast Iron
- Joined
- Jan 3, 2013
- Location
- Arkansas USA
Will the direction of rotation of the idler motor indicate the direction of rotation of the spindle motor?
inside the control box, incoming line 1L1 connects to H1 on the control transformer, and it is jumpered to H3. Lead 1L3 is connected to H4 on the transformer, which is jumpered to H2.
That leaves 1L2 as the only line-in lead not connected to the transformer. That will be the lead that id connected to T3, the manufactured lead from the RPC ?
inside the control box, incoming line 1L1 connects to H1 on the control transformer, and it is jumpered to H3. Lead 1L3 is connected to H4 on the transformer, which is jumpered to H2.
That leaves 1L2 as the only line-in lead not connected to the transformer. That will be the lead that id connected to T3, the manufactured lead from the RPC ?
Yes, the one not connected to the transformer should be the manufactured leg. The other two would read 230 betwixt them, or 115 to ground each (the manufactured leg shows an oddball voltage to ground). Just swap the other non-manufactured legs if the rotation is the wrong direction (don't change the speed control until the spindle is rotating in the proper direction). Cheers, be careful.
Similar threads
