This is an application note is from our supplier Acromag - it is a possible solution for remote power metering using their 989EN-4016 16 Channel I/O with counters and Timers
Defining the Problem:
At a large military complex, current reporting of electrical usage is transmitted from Substations directly to the Electric Utility only. The Public Works division onsite would like to establish a data collection system of the power usage for energy auditing and optimising operations. Due to obstructions and installation restrictions, the telemetry system would operate over a 3G/4G LTE mobile network using Digi WR21 Cell Routers.
System Requirements:
At the substations, the Electric Power Meters’ pulse outputs to the Utility are re-transmitted to the data collection system via Electrical Isolation Relays. A relay output, 1 pulse = 1 kWh, is connected to an input channel on the 989EN-4016. The current totalised count is converted to Modbus TCP/IP and connected to the Ethernet port on the Mobile Router (Cell).
| Implementing the Solution: | Featured Products: |
| 1. Set up a Private APN with a Mobile Carrier to reserve internally customer supplied IP Addresses 2. Configure the Mobile Router IP Address using a reserved IP Address. For example, 10.0.0.20 . 3. In the Mobile Router, configure the Ethernet Port Forward with the IP Address of the device connected to its Ethernet port, either the 989EN-4016 in the field or the Server IP Address in the Control Room. The Server software would send a Modbus TCP/IP message to the IP Address of the Mobile Router that would forward it to the 989EN-4016. 4. For multiple field locations, the Mobile Router at each site can have a unique IP Address (10.0.0.21, 10.0.0.22, etc), but every Acromag 989EN-4016 connected to it can have the same IP Address (192.168.1.1). This standardises the set up and allows each Acromag unit to be configured the same way. 5. For the data collection, the Server can request the totalised count from the 989EN-4016 at whatever time interval is desired from hours to days. To do this, program the Server application software to Open and Close a Modbus socket with each message exchange For further information on the Acromag Solution or the 989EN-4016 product please contact: If in Australia - Metromatics +61 7 3868 4255 or sales@metromatics.com.au Outside this area - Acromag +1 248 295 0880 or sales@acromag.com |
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