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VPI SDS speed issue

I am having trouble with a consistent speed on my Aries 2 two pulley setup. I find I have to at times set the frequency to almost 66 to get it spot on. At other times it may be at 63. I read somewhere about the voltage preset may need adjusting. How is that done or is there something else I should be looking to adjust? The motor stas at 115, shifts to about 84after warm And then maysettle down to about 72 Hz. Any help?
drpat

Showing 2 responses by brf

brf
1,715 posts
 
Go to the VPI website and download the SDS calibration manual. If your SDS goes from 115v => 84v => 72v then something is wrong because the SDS is only programmable for a single step down voltage i.e. 115v => 72v. The step down voltage can be programmed by the user. Depending on the age of your SDS, the factory default is set at either 72v or 84v. Try recalibrating your SDS and report back.
brf
1,715 posts
 
The SDS is not a power line filter it’s an AC power regenerator (like a mini PS Power Plant). The SDS first converts the incoming AC to pure DC voltage and then digitally regenerates its own clean AC signal.

The SDS is designed to work with the AC synchronous motors. The speed of a synchronous motor is determined by the frequency it is fed. Logically, a device whose speed is based on the AC line frequency will function better when a stable consistent frequency is delivered.
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