Rather early in my career, I began working with destination dispatch elevator systems and have since had the opportunity to be engaged with a handful of these projects. Although I am far from an elevator expert, a fair number of my days as a technician were spent working on access control systems which were frequently correlated with destination dispatch.
As I’m sure you know, power companies charge a premium when a certain demand threshold is reached. Load shedding during high electrical demand periods is a good way to lower electrical consumption and avoid paying premium prices for exceeding peak demand limits. Metering or monitoring the load for the building will tell you when that threshold is nearing.
Load shedding will probably not work if the demand follows a bell curve during the day, where the threshold is exceeded for a good portion of the day. In this case, the building needs to find ways of increasing energy efficiency, either by purchasing more efficient equipment, eliminating waste, etc. However, if there is a peak in the demand curve that is exceeded around the same time everyday, load shedding could help. The question is, what can you afford to shut down without making people uncomfortable and angry? Continue reading Load Shedding and One Approach in CBAS
On March 21, 2018, Computrols Director of Research and Development, Mike Donlon, presented on the topic of “Optimal Virtual Metering In Building Automation” at the Globalcon Conference in Boston, MA. The below information is a transcribed excerpt from his session.
The CBAS Web product was originally introduced so that tenants could schedule their own overtime air and lights while making it easy for building management to bill them these services. This is still true and it’s really easy to set up. This feature saves money because you don’t have to pay someone to take calls and enter the tenant’s overtime requests into CBAS. Management can now also setup tenants to handle their own access control cards, but let’s talk about overtime tenant billing for now. Continue reading George’s CBAS Tips, August 2018
The Importance of the Probe in BACnet
When setting up 485 communication to a BACnet device like an AHU, it is important that you Probe it. This gets you some important information:
- Instance number is a good thing because if you add it to the program screen of the controller, it connects much faster when CBAS is restarted. Instance is usually provided in the Probe file but can sometimes have a different name.
- A Probe gets you the list of points that are on the AHU controller. Then you can add them from the Probe file easily by clicking the controller then click Add Points From Probe File.
- Perhaps the most important advantage to probing is that it automatically sets a few parameters to be used by CBAS that can improve performance. Note that you can alternatively set these parameters manually.if probing isn’t possible The most useful of these settings are are COV and Read Multiple. COV is Change of Value and if it is available, it sends any changes in value to the host. Read Multiple reads up to 14 points at a time. By default, CBAS only reads one point at a time unless you have Read Multiple set.
If you are familiar with the industry, you are likely aware of the talent and knowledge gap between the seasoned veterans and industry newcomers. With many building engineers, system engineers, and controls specialists approaching retirement, there is a need for fresh talent in the industry. While fresh talent and enthusiasm are certainly needed, how is the knowledge gap being addressed? Continue reading Where to Get a Building Automation Degree