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HOWTO: Configuring a Tunnel Alert

Last Updated: Jan 21, 2015 09:31PM CET
DEXCell Energy Manager allows to create several types of alerts which will help you to detect some inefficiencies on your facility. There exist 6 types of alerts: threshold, no data, load excess, reactive excess, cost and tunnel alert. In this article, we are going to explain the tunnel alert. For more information about configuring the other alerts, click here.  

The tunnel alert will help us to detect when one of our devices is out of an especific range of values, simulating a tunnel. The alert will notify us when we exceed a margin for above or below. 

In order to create this "tunnel" or range of values, the system will calculate the median or the average of the previous weeks. This number of weeks is set up by the user. 

1. In order to create a "Tunnel Alert", go to Alerts and click on "New alert". 

2. Select the Tunnel alert and fill all the information to configure it properly:
  • Alert name: write a distinctive name for the alert
  • Activate?: the alert can be active or not
  • Parameter: select the energy source you want to evaluate
  • Frequency: select an hourly or daily frequency to set the alert
  • Weeks: select with how many previous weeks you want to compare
  • Device: select the device you want to check and be notified
  • Agrupation: select the operation to prefer to calculate the value to compare. You can group the values by the median or by the average. So the system will take the values of the previous weeks (number of weeks selected by th user) and calculates the median or the average
  • Upper margin: indicate a upper margin in % from the value obtained on the "agrupation" 
  • Lower margin: indicate a lower margin in % from the value obtained on the "agrupation" 
  • Warnings generated last 7 days: value indicating us how many alerts would be obtain in the last 7 days
  • Preview: graph representing our baseline, upper margin, lower margin and average of the last week.  


Imagine we have set an hourly alert which compares the previous 3 weeks with a margin of 5%. Then, we receive an hourly value  of 100 kWh at 08:00h of a Monday. 
The system will check the values for the previous 3 Mondays at 08:00h:
- 1: 82 kWh
- 2: 90 kWh
-3: 85 kWh
The average of this 3 values is: 85.66 kWh. If we calculate the tunnel with the 5% of upper and lower margin, we obtain a range of [81.38, 89.95]. As the value of 100 kWh is out of this range, we will obtain a notification

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