Thanks Lionel,
We're talking with ABB now. Maybe they will have some ideas how we can better tune it. We've spent a few weeks with it and haven't solved it.
Gunnar,
Thanks for the recommendation of the OptiDrive Plus 3G. We picked one up. We also bought an encoder module for the ABB ACS350 drive we are currently using. Wow! So far, there is absolutely no comparison in performance. The ODP can start from a dead stop and hold the hoist there at our...
niallnz,
I had thought about that, but the Z channel is only once per revolution. I need a minimum of 60 for positioning. Good idea though. I'm also ordering a 1024PPR encoder for the motor. We think we have figured out a way to add it to the back end of the motor. It will take some work, but...
I wish I were in the UK. Unfortunately, I'm strapped to my office chair in Chicago. I spoke with a couple different guys at Bardac today. One said it probably wouldn't cure the problems and the other said it would. Since time is short, I'm giving it a shot. Before the end of the week I'll know...
Gunnar,
I ordered an Invertek Optidrive Plus 3gv today. I should see it tomorrow and be able to check it in our application hopefully on Thursday. This would easily be the least painful modification to the existing hoists, "if" it works. I'm still actively looking at other options in case their...
niallnz,
Thanks for that info. We do have the encoder input module for the ACS350 drive. Unfortunately, the Brother gearmotor has no place to add the encoder. Our drum encoder for positioning is only 60PPR. I'm not sure the drive will be able to do much with that limited information. The motor...
Gunnar,
I did look at the Optidrive Plus 3gv. It looks like it may work for us. I've got an email into them to find out pricing and availability. I need 66 of these in a hurry, but just one to make sure it will solve the problem.
Kieth,
I checked further into the ABB ACS800 drive with DTC (Direct Torque Control). It's supposed to hold a load at zero speed without an encoder. The price is 3X the price we paid for the ACS350 we currently use. I got a quote of around $1200, as opposed to the less than $300 for the ACS350...
Gunnar; I'll check out that drive. maybe we just need a different one. I'll also call ABB again, since they helped spec the 350 series.
Lionel; From all my reading we "should" be able to get it to hold at zero speed, though so far we have not been able to do that. I think having an encoder on...
Thanks for the replies,
Keith,
Do you have any recommendations on motor manufacturers? We went with the Brother because it was light and small, which were pretty critical to our design. Unfortunately, they don't have an encoder option. There are some third party add-ons from Dart, but the...
Hi,
First time posting here. This is a great forum. I've learned a lot from just reading it all day.
I've been assigned to make a cable hoist for our company. I finished the first batch of them and they turned out pretty well, but I'm having a few problems that I could use some expertise on...
