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How to Setup Alarms in System Manager Software (SMS) on Totalized Values from Multiple Circuit Monitors Using a Virtual Circuit Node (VCN).

This is the procedure to setup a Virtual Circuit Node (VCN) alarm in SMS version 3.x, or 4.x:
1) Create a Virtual Circuit Node in SMS. Setup > Devices/Routing > Add > Virtual Circuit Node.
2) Select all meters that you want to add to the VCN to totalize values for and update.
3) Setup a PC-based alarm. Setup > Functions/Alarms > Global Functions Tab > Add.
4) Select the Virtual Circuit Node device type and select from the available alarm quantities listed. Click OK.
5) Select the alarm created and click Setpoints. Define the alarm appropriately and assign alarm categories.
6) Make sure to set the Poll Interval appropriately to tell the software how often to poll for the alarm condition.
7) Click on the Assign Functions tab, select your device, and move the available alarm that you created over to Functions Selected.
8) Update and close.

James has one feed coming from the utility company to switchgear. The power then splits off into three circuits, each of which is equipped with a Series 4000 Circuit Monitor (CM4000, CM4). James wants to be able to monitor the kW total for all three of these CM4s and alarm when it gets over a certain value so that they can shed load and avoid a high peak demand charge from the utility company. (This has to be done in software, because CM4s cannot read data from the others and can only alarm on its own readings.)

James goes through the above process, creating a Virtual Circuit Node for his 3 CM4s (they do not all have to be the same type of meter). He adds an analog PC-based alarm for the Virtual Circuit Node and uses the default name Real Power Total. He then creates a High condition to alarm as a Level 4 PC alarm when the Real Power Total for the 3 CM4s gets over 2500kW. He creates a Highest condition to alarm as a Level 3 PC alarm when the Real Power Total gets over 3000kW. He saves the setpoints and assigns the function to his Virtual Circuit Node. Now, his alarms appear in the Active Alarms window and he can shed load when one of these conditions occurs.

  • Date Created: September 13, 2007
    Last Revised: March 4, 2008
    Original Author: AV
    All content © 1992-2008 Schneider Electric
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