Now your SNAP PAC System can easily monitor 480 VAC, 3-phase electrical equipment—including lighting systems—without the need for a potential transformer.
In response to customer and integrator requests, we've just increased the range for the SNAP-AIPM-3 and SNAP-AIPM-3V analog input modules from 0-250 VAC to 0-300 VAC, so you can wire 277 volt line-to-neutral signals directly to the module.
We've also doubled the resolution of current inputs on the SNAP-AIPM-3 by changing the range to 0-5 amps (previously 0-10 A). Since CTs used with the module are typically 5 amps or less, the newer range simplifies scaling, too.
Both modules monitor 3-phase power using wired inputs for voltage and current on each phase. Both modules then compute true power and volt-amps for each phase, plus true power sums for all phases.
Important things to know about the change
- The change starts with modules manufactured in April 2011. Modules shipping from our factory today match the new specs.
- You can tell modules apart by the printed specs on the module itself and by the connector latches on the newer modules. (Older ones had the same connectors, but without the latches.)
- Newer modules require brain firmware version 9.1b or newer and PAC Project 9.1a or newer (both to be released within 30 days).
- Scaling in PAC Control is different from the older modules. See the SNAP Power Monitoring Modules Data Sheet for scaling examples.
- Older SNAP-AIPM-3 and SNAP-AIPM-3V modules can be exchanged for newer models. Contact Product Support for information or answers to any questions you may have about the change.
A little history...
Here's a little history for the curious: Energy monitoring goes way back at Opto. Years ago we started making the SNAP-AIVRMS and the SNAP-AIARMS, the first for voltage and the second for current. To monitor power, you could put them both on a rack and do the math for true power and VA in your control strategy.
Later we put both voltage and current inputs and the true power/VA calculations into one module, the SNAP-AIPM, which monitors single-phase power only. Now the SNAP-AIPM-3 and SNAP-AIPM-3V do it all for 3-phase power.
All of these modules are still available, by the way, and of course the SNAP-AIVRMS and the SNAP-AIARMS are used for other purposes, too.
Yes, if you focus on energy management. Not only can you save money by increasing energy efficiency; you can also use curtailment programs as a source of revenue.
We'll show you how. Join OptoPartner Advanced Energy Control (AEC) and Opto 22's Craig Wilke in booth 115 at the IARW-WFLO Annual Convention & Expo, April 30-May 4, in New Orleans. They'll be demonstrating the OptoEMU Sensor energy monitoring unit as part of a complete energy management system.
The Expo is jointly sponsored by the International Association of Refrigerated Warehouses (IARW) and the World Food Logistics Organization (WFLO).
Find out more about the Expo.
Learn more about refrigeration energy management.
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