Help VPI SDS Issue

I took the plunge and got the SDS. Wow what a difference but I am having an issue. (I am using the 600 rpm motor) In order to get the motor to spin the platter I have to push it to start it moving. The motor is on but it sound like to is hesistating. I unplugged the SDS and no issue it starts right away. Is this an issue with the 600 vs 300 motor?
This is not a problem with the motor. Just give the platter a bit of a push with your thumb to get it started. If it bothers you, you could re-talc the belt. (A bit of talcom powder in a pastic bag, drop the belt in the bag, shake, then reinstall the belt.) You will achieve yet another level of sonic improvement by upgrading to the 300 rpm motor.
I tried to go the re-talc the belt route and still the same issue. Do you think this could be an issue with the SDS unit?
The motor is fine, it needs a push just like when you start at 45rpm sometimes. but you ruined your belt by putting powder on it.
You can find out by simply bypassing the SDS and again plugging the motor directly into your AC outlet. See if you get a different result.
What output voltage did you set it to. If you set it too low, the motor may not have enough torque.
Try increase the voltage reading on the SDS. This is the output voltage supply to the motor. I learned that the lower the voltage the smoother the motor runs (lower noise level). Therefore, VPI presets the SDS unit to a number much lower than what coming out of the wall outlet. Having said that, as an experiment, you can set the SDS output voltage lower/higher than the current setting if you want. If you set it too low, the motor wont turn so keep turning it up until you reach the point of optimization. ( For example, if you find the lowest point is 72 volts, you then would want to set the SDS at 75 volts to compensate for fluctuations within the motor).

In your case, try to increase the voltage setting by one increment at a time until the motor start to turn.

Good luck,
Thanks John
I have it set on for example 33 1/3 rpm I have it set a 72/60
I think this is definatly a torque issue as a little nudge gets the table going but its seems like I shouldnt have to do this
I had the same problem. There isn't much you can do for the 600 RPM motor. When I upgraded to the 300 RPM motor the problem went away and the table sounded better! The motor is fairly cheap so I would push the platter for now and get the motor as soon as you can!
if you call vpi, they will send you a capacitor to modify your motor, if you're willing to open it up. the std. setting on the SDS does not provide enough start-up torque with the older outboard motors, as i also found out. being a lazy bum, i opted to program the SDS to provide a higher start-up voltage- the instructions are in the manual. at this higher setting there is more motor "noise" however. can "you" hear it?
i cannot, but then...
Thanks for the advice
I had this exact problem after I upgraded my TNT to a superplatter, ring clamp and SDS. In my system, it was caused by the SDS - the SDS does not provide enough start-up torque with the older SAMAs. In my case, I had a 14 year old SAMA. I changed the SDS voltage and VPI even sent a capacitor, but nothing helped. The solution was to purchase and install the VPI 300rpm motor upgrade kit. Check it out here:

It was very easy to do and competely took care of the issue. I run the SDS at the factory set voltage and my TNT is quiet and starts up each and every time.

Have you gone into calibration mode on the SDS and adjusted the settings? You should be able to correct this.
If you don't know how, go to the VPI website and select "Manuals". There is a word document explaining calibration mode for the SDS.
Hopefully, that's all you need to do.



If I'm not mistaken, the only voltage adjustment available for the SDS is for the 'steady state' voltage, i.e. the SDS always starts at 115v (for maximum motor torque), and after a few seconds drops to whatever 'run', or 'steady state' voltage you've selected (for a more quiet motor).

I've got a feeling that the issue is the 600rpm motor-I've never had a problem with my Aries 2.
Same thing when we added the SDS to my friends Clearaudio Champion. Just give the platter a little shove. BTW- we needed to up the Hz on 33.33 and lower on 45 RPM from factory setting. Once we dialed it in using the strobe the sound was absolutely astonishing. Pace, rhythm and timing are not just audiophile and reviewer buzz words. The sound took on a CD-like quality, and I mean that in the best sense. Tight bass, quieter background and just an overall rightness to the music.
Yes, you are correct. I hadn't dealt with those settings in so long that I forgot what could be customized.
Please ignore my prior post.

That does lead me to ask a question. Do SDS users leave the motor turned on, so that the table starts spinning when the SDS is turned on? Wouldn't you have to do it this way to take advantage of the ramped up voltage at turn-on? Or does the SDS ramp up the voltage when it senses that the motor has been turned on?
I keep my motor on all the time (upgraded motor w.flywheel, TNT Jr., superplatter) and the sds power's up my table. No issues (and sounds great). Motor took too long to get to proper speed leaving the sds on and using the power switch on the motor - so Tfaudio, you may be correct.
Interesting question Tfkaudio-

I've always just left the motor switch 'on', and turned the tt on with the sds.

However, *for the sake of experimentaion*, I tried it as you described-motor switch off, turn on SDS-and the SDS almost *immediately* jumps from 115v to the 'run' voltage. Whereas, with the motor switch on, turn on the SDS, it takes about 5 seconds for the voltage to drop.

The sds was apparently designed to have the motor switch on at all times.

*Now we know!* (-:
Hmm, This sort of sounds odd, that VPI's own Table isn't compatible with thier own SDS, then one has to rip into the Turntable, to swap a Cap? Shouldn;t be I say, but if that's what it needs, then that would be the route I would go.

My HW-19 uses a 600rpm Motor, and never had an issue with the SDS, as far as start up.

Yes, the SDS drops to a lower running voltage, but upon start up, the SDS supposed to provide a full 115VAC for a few seconds, then ramp down the voltage to what one selects, or if that has yet to be done, the default voltage that was set by the factory.

This is to give the motor time to come to speed.
If 72V is too low, then yes, try the next higher up, or even two higher up. If you still have issues, definitely contact VPI, I'm sure they'll have some answers. Mark
How do you change the voltage on the SDS?
Call VPI
Even easier. Click this and there is a downloadable manual as well as the calibration information about half way dow the page. The calibration info tell you how to adjust the steps in the voltage.
Hello Drpat.
As Wntrmute stated, the calibration manual is availble in PDF format on VPI's website. The calibration of selecting the "ramp down" voltage is all done via the push buttons on the SDS's front faceplate.

And there's also an hour meter available, you can actually know how many hours of use been placed on your unit.

With my own HW-19 (16lb MK-IV Platter), which had the 600rpm stock Motor, and I'd power up via the Table's on-off switch located on the base, or when I got the VPI SAMA for the HW-19, and decided to power the Table direct from the SDS's switch, never had a problem either way.

More than likely, it would be a problem with the run capacitor on board. Although there just might be that possibility as well, with an ultra heavy platter like the Super Platter, one might have to help it along.

This is something I always commonly do with my own table, as it helps reduce wear and tear on the drive belt. Mark
Thanks for all the advice. Got the downloads and will be adjusting soon. Particularly like the info on the timer! Learned something new! Thanks again.