leeko
Stainless
- Joined
- Jun 30, 2012
- Location
- Chicago, USA
Hi all
I'm working on a Brobo 300 cold saw just now. It was wired for 220v 3ph when I got it, but the motor struggled to get to speed on my RPC, got really hot then tripped the breaker. The heat was coming from the middle of the motor, not where the bearings are on either end.
I pulled the pecker head/switch cover off the motor, and found it was a mess. Some of the wires were free floating inside the box, and not protected so I'm thinking they could have been causing a short to explain the heat.
The 2 position drum switch is mechanically buggered, and will be replaced. I'm thinking I'll run it from a VFD, as I have a spare one handy. The problem is that the leads aren't numbered, and I don't trust that the last guy had it right (given the dogs dinner I found).
The motor is an AEG 1.7kw 2-speed 220v 3ph motor. From the AEG website/pdf manual, I figured it's a single winding that can be wired delta or wye for each of the speeds (wiring diagram and motor nameplate attached).
Here's what it looks like coming from the motor. There are two sets of 3 leads, each set in a fiberglass sleeve. Is it safe to assume that each set of three represents U1,V1,W1 and U2,V2,W2 ? In which case I can just pick one set, hook those three and ground to the VFD output, and see if it's the right speed?
One other issue I'm not sure how to approach, is that the high speed requires the other set of leads be shorted together (but not so for the low speed). Without knowing which is which, is it safer to try each set in turn with the other set open or shorted?
If anyone can advise, I'm sure the motor would greatly appreciate it before I let the magic smoke out!
Thanks in advance,
Lee
Sent from my SM-N960U using Tapatalk
I'm working on a Brobo 300 cold saw just now. It was wired for 220v 3ph when I got it, but the motor struggled to get to speed on my RPC, got really hot then tripped the breaker. The heat was coming from the middle of the motor, not where the bearings are on either end.
I pulled the pecker head/switch cover off the motor, and found it was a mess. Some of the wires were free floating inside the box, and not protected so I'm thinking they could have been causing a short to explain the heat.
The 2 position drum switch is mechanically buggered, and will be replaced. I'm thinking I'll run it from a VFD, as I have a spare one handy. The problem is that the leads aren't numbered, and I don't trust that the last guy had it right (given the dogs dinner I found).
The motor is an AEG 1.7kw 2-speed 220v 3ph motor. From the AEG website/pdf manual, I figured it's a single winding that can be wired delta or wye for each of the speeds (wiring diagram and motor nameplate attached).
Here's what it looks like coming from the motor. There are two sets of 3 leads, each set in a fiberglass sleeve. Is it safe to assume that each set of three represents U1,V1,W1 and U2,V2,W2 ? In which case I can just pick one set, hook those three and ground to the VFD output, and see if it's the right speed?
One other issue I'm not sure how to approach, is that the high speed requires the other set of leads be shorted together (but not so for the low speed). Without knowing which is which, is it safer to try each set in turn with the other set open or shorted?
If anyone can advise, I'm sure the motor would greatly appreciate it before I let the magic smoke out!
Thanks in advance,
Lee
Sent from my SM-N960U using Tapatalk