115v motor actuator drive
115v motor actuator drive
(OP)
I need to control a 1/2HP 115v motor...nothing fancy, just want to accel and decel - repeatably. I'm driving a 1500# load with an actuator (Duff Norton SPA6420). I found the perfect drive, a Leeson 175322. I need it in 3 weeks, I can't get it for 10. After scouring the WWW on and off for 3 days I cannot find a similar model, thought maybe you guys knew of a place that sells a 115v 1/2HP drive. It doesn't even have to be new at this point, as long as it works. Unless I'm missing some obvious alternate solution. My experience with softstarters has been non-repeatability, so I'd rather not go down that road. Would appreciate any help.





RE: 115v motor actuator drive
Keith Cress
kcress - http://www.flaminsystems.com
RE: 115v motor actuator drive
RE: 115v motor actuator drive
Regular VFDs are so competitively crammed with the latest tech and lowest prices, I'd guess they're the best bang-for-the-buck item in all of industry. What you get for the money astounds me every time I crack one open and every time I press "Buy Now". I look at the cast heatsinks and wonder how they can even sell that for the out the door price of the entire drive! Then on top of the casting you have a digital signal processor and all it's ecosystem and probably more than a 100 man-years of engineering stuffed in the firmware. For your application you can get all that in a standard VFD for probably $70 new. Why would one bother with single phase? Other than I guess you, with the size issue.
You know you can buy small 3ph motors with VFDs built into them?
Keith Cress
kcress - http://www.flaminsystems.com
RE: 115v motor actuator drive
RE: 115v motor actuator drive
Possibly a 1 HP drive.
Possibly a 230 Volt drive programmed for 115 Volts.
Possibly a different series drive.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 115v motor actuator drive
The motors in those actuators appear to be Capacitor Start / Induction Run (CSIR) type. The capacitor would have fried your little VFD, or the VFD would have popped the capacitor; it's a race to failure between the two. Bottom line, you cannot use a VFD on those actuators, they can ONLY be fixed speed.
So now, why is variable speed critical for this? These things don't exactly move fast!
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: 115v motor actuator drive
Link
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 115v motor actuator drive
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Keith Cress
kcress - http://www.flaminsystems.com
RE: 115v motor actuator drive
I did notice that right away, and asked the mfr what type of motor it is and he told me PSC. Additionally, it says in the manual that for reversing, the capacitor must "be disconnected". I haven't gotten my hands on it yet, but am pretty sure I can get into it and disconnect it.
I'm sure I'll get yelled at for asking, but can you explain why? I deal with this stuff on a much higher level.
The variable speed will only be used to reduce it to a slower speed before coming to a stop. I pretty much just need a 2-speed, it's not going to vary much more than that, other than the accel.
Keith - thanks!
RE: 115v motor actuator drive
It showed three wires. Two windings arranged in a V with the capacitor connected between the ends of the windings.
Label the wire where the two windings connect as "1" and the two ends that are bridged by the capacitor as "2" and "3",
Then applying power between "1" and "2" will give rotation in one direction.
Applying power between "1" and "3" will give rotation in the other direction.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 115v motor actuator drive
RE: 115v motor actuator drive
A non-reversible PSC motor will have two wires.
A reversible PSC motor with equal windings will have three wires.
A reversbile PSC motor with unequal windings will have four wires.
The diagram that I found for the OP's actuator was the diagram I have seen for a PSC motor with equal windings.
The diagram that I found for the OP's actuator showed three wires.
I have seen a number of small PSC motors using equal windings and three wire reversing.
These are usually fractional HP and small fractions. I have not seen this done with large motors.
This is worry-some;
A motor runs forward with a capacitor and runs backwards without the capacitor???
Well, maybe.
There are a lot of small motors that use a high resistance start rather than a capacitorwinding to develop a phase shift relative to the running winding to develop starting torque.
I imagine that one of these motors may be loaded up with enough capacity on the run winding to cause it to start in the opposite direction.
Have I ever seen this? No.
I wonder if a winding can be designed to work this way, develop enough starting torque in both directions and withstand continuous running in either direction without overheating.
Maybe....
Should this read; "Reversing with a VFD"?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 115v motor actuator drive
If you need fine control, then I think you may want to look at using a linear servomotor.
RE: 115v motor actuator drive
RE: 115v motor actuator drive
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: 115v motor actuator drive
RE: 115v motor actuator drive
https://www.automationdirect.com/adc/Shopping/Cata...
Fuji electric makes similar drives, for a bit more money, and is the more usual brand I look for.