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Good idea. I have not thought of that one yet. I will swap the motors' position and test to see if it's one of the motor's or the board's problem and report back.Before you replace it, swap the wiring harnesses. So if you try to turn the right motor, the left one spins. Turn the left one and the right one spins. See if the problem follows the motor or the wires.
What should happen, if you have a bad motor, is that the bad motor still won't spin and the good one will spin. This will verify the motor is indeed bad. However, if the 'bad' motor now works and the good one doesn't, then the problem lies somewhere between the connector and the controller. Whether it's just a bad connector or a problem with the circuit board or a problem with the apex, we'd have to figure out later.
This is just a quick a very quick test to confirm the motor is bad. You don't want to spend $65 and wait 2 months for it to ship from China just to find out it wasn't the problem.
PS, if you do this, label the motors (good/bad). Once you start moving things around, you're eventually going to forget which one is which.
What are the chances you can send it into Neptune for repair? (IDK is why I asked...) Have you called Neptune? Granted it probably won't be warranty but getting it fixed should be less costly vs new replacement.
I actually read the OP a few times to make sure you didn't mention it. It's one of the first things I would have done, especially considering that it appears as though there's more than enough slack in the wires to make it really easy to do. But, I'm a troubleshooter by nature, it's what I do.Good idea. I have not thought of that one yet.
Thank you for the detail insight and finding out the difference concerning the two motors. So the two are not exactly identical after all.I actually read the OP a few times to make sure you didn't mention it. It's one of the first things I would have done, especially considering that it appears as though there's more than enough slack in the wires to make it really easy to do. But, I'm a troubleshooter by nature, it's what I do.
Anyways, moving on. The model number on yours is HSP-24-250-NPT-2-P, the AliExpress one you linked to is HSP-24-250-NPT-4-T-PO.
The biggest difference being that yours has 2 rollers and theirs has 4. I don't have a DOS (or an Apex or anything by Neptune) but presumably when you calibrate the new motor/head, that will be compensated for.
The "O" at the end of their model number is the color. It's orange, so it should match, or at least be close.
The only other difference is the T, which stands for 'external tube'. I'm not sure what they mean by that. It might just have to do with the matieral the barbed fittings are made of (PVC). I probably wouldn't let that part be a deal breaker for me. There's always a way to make a tube connect to another tube.
The only part that I'd really be concerned about is that the DOS driver can drive this stepper. I don't know enough about the technicalities of stepper motor drivers to be able to answer that. If this part is wrong and $65 won't break the bank, I'd say go for it. Especially if you can find another use for the motor at some point. Stepper motors are handy, but you'd have to either buy a driver or build/program one with an Arduino or Raspberry Pi. Come to think of it, since it comes with the rollers and tubing, you could use it as an ATO or another dosing pump. And on top of that, if you've never played with a Raspberry Pi or Arduino, it's a nice little skill to pick up and not all that difficult, and for how powerful they are, they're really, really cheap. A Raspberry Pi can be had for like $50 and is essentially a fully functioning computer.
EDIT: If you're not comfortable with gambling $65, I'd either bite the bullet and get a new one (or find a used one (here/craigslist,ebay) or send yours in to be fixed.
Given if the stepper motor can be driven by the DOS driver, then it should be just a plugging in the new stepper motor process requiring not much but a screwdriver and re-plugging in harnesses.I have no particular wisdom to impart .... but am interested to see how you do this . I replaced a motor on my GHL with a manufacturer sourced spare part, but so far have not had to fiddle with my DOS. I'd be surprised if the DOS motor/dosing head were anything other than a standard OEM item.
And, now that I think about it, as long as the shafts on the two motors are the same, OP could probably just re-use the existing DOS head.Yea thats just the roller in the head. That most likely the exact same pump. People have bought those 4 roller heads as an upgrade. They snap right on...
HSP-24-250-NPT-4-T-PO means:So might the "NPT-4-T-PO" part of the number describe the orange pump head, while the "HSP-24-250" describes the motor?
The "250" part I think they meant by 250ml as described in the specs, which is the same as the original DOS part.
Thank You again for a complete and more comprehensive explanation of the model number involved. From what you have explained so far, it seems like the motor might just work.And, now that I think about it, as long as the shafts on the two motors are the same, OP could probably just re-use the existing DOS head.
HSP-24-250-NPT-4-T-PO means:
HSP=Honlite Stepping Peristaltic (Pump)
24=24 volts
250=250 ml/min
NPT=National Pipe Thread (the standards the threading uses, it's like asking if a bolt is Metric or Imperial)
4=4 Rollers
T=type of tubing that, I think, it's shipped with. It appears to mean Tygon S3 E-LFL, I'm sure whatever you have on hand is fine.
P=Peristaltic
O=Orange
I don't see any exact matches, at least not by Honlite. The one you found appears to be the closest. If that's who's making them for Neptune, it's possible there's a deal in place where Honlite isn't allowed to sell the identical one...they have just about every other variation, just not 2 rollers at 250ml/min driven by a 24V stepper motor.
Also, coming back to this "So might the "NPT-4-T-PO" part of the number describe the orange pump head, while the "HSP-24-250" describes the motor"
P-NPT-4-T-PO [the inital P is the last letter from HSP, 'pump'] describes the head, but the 250 would as well, or at least when coupled with that motor. Remember, all the motor does is spin. It doesn't know if there's a pump head or a 3D printer or a robotic arm doing microsurgery attached to it. It's told how how far, how fast and in which direction to turn and it does that.
A better way to look at is that HSP-24-250-NPT-4-T-PO describes the entire assembly. Especially since you'd need more than just HS-24 to describe the motor, that's just a brand name (Honlite), type of motor (stepper) and the voltage (24vdc).
You mean there are 2 types of pump head offered by Neptune? Or is it that people have bought the 4 rollers head not from neptune and used it on the DOS?Yea thats just the roller in the head. That most likely the exact same pump. People have bought those 4 roller heads as an upgrade. They snap right on...
Neptune cheaped out and supplies the two roller head offered by honlite. People have ordered the 4 roller heads, which were actually supplied by GHL for the Maxi doser until they stopped making that doser recently and poped it right on the DOS. Also vice versa.You mean there are 2 types of pump head offered by Neptune? Or is it that people have bought the 4 rollers head not from neptune and used it on the DOS?
That explains why the GHL dosers' pump head externally looks the same as Neptunes' pump head except for its blue color versus orange color.Neptune cheaped out and supplies the two roller head offered by honlite. People have ordered the 4 roller heads, which were actually supplied by GHL for the Maxi doser until they stopped making that doser recently and poped it right on the DOS. Also vice versa.
I want to order the 4 rollers next time i need to replace mine! Avastmarine sells them separately because they used to sell a peri pump with the same blue head on it that GHL Maxi had. They actually went away from that design but kept the roller for their new model. I bet all these guys get them from the same source and build there own pumps with the same parts. Ive never seem a picture of the inside of a Maxi but id put $100 on it being Honlite and id even bet its the same specs as the DOSThat explains why the GHL dosers' pump head externally looks the same as Neptunes' pump head except for its blue color versus orange color.
The same company might be supplying the motor to GHL as well given if the pump heads are made by the motor company.
Very good info. Thanks.
@MadeForThat provided in his thread on EB832 that the motor might be a Nema 17. Any input from anyone who had used this to replace the stepper motor before? Will this be a compatible motor?@2mk As for the stepper motor, it probably isn't the motor unless the bearings gave out. If you open up the case it will have a sticker on the side that will have all of the requirements, and you should be able to find an exact replacement. If I had to guess it is a nema 17, but you will have to confirm with the name plate sticker or by measuring the "face" (with the shaft coming out) to see if it matches this:
nema stepper motors have standardized mounting faces, but the length "L" in the drawing changes depending on the amount of torque required.
I toyed around with replacing the dos stepper drivers with something more modern, as 3d printers have improved there has been a lot of development into silent stepper motors/drivers. the Neptune pcb does not lend itself well to this kind of modification, but if you were experienced enough, it surely could be done. @_AV if you can figure it out, I think a lot of people would love to pay for a service to have these stepper drivers hacked into their DOS..... I'd definitely be interested lol