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 optimizing operations. Due to
obstructions and installation restrictions, the telemetry system would operate
over a 3G/4G LTE cellular network using Digi WR21 Cell Routers.
Implementing the Solution:
- Set up a Private APN with a Cell Carrier to reserve internally customer supplied
- IP Addresses.
- Configure the Cell Router IP Address using a reserved IP Address. For example, 10.0.0.20.
- In the Cell 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 Cell Router that would forward it to the 989EN-4016.
- For multiple field locations, the Cell 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 standardizes the set up and allows each Acromag unit to be configured the same way.
- For the data collection, the Server can request the totalized 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.
Featured Products:
989EN-4016, 16 DIO / up to 8 Counters
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 totalized count is converted to Modbus
TCP/IP and connected to the Ethernet port on the Cell Router
No comments:
Post a Comment