Schweitzer Meters

Purpose

The purpose of this plugin is to collect data from Read Schweitzer Engineering Electricity Meters via Modbus.

Usage

This plugin reads the data from Schweitzer Engineering Electricity Meters model SEL 735 via Modbus, and via serial or TCP. Meter data will be collected to the meter table. By default, it will collect data every 5 minutes, but can collect at a minimum rate of about 0.3 seconds via TCP. The plugin will make 1 attempt (by default) to read the meter. This plugin relies on the Modbus Ardexa plugin. Two config files are available, sel735_meter.txt and sel735_meter_new.txt. The types have different scaling factors and numbers of variables. Type 1 was the original configuration file, and Type 2 is an updated version, with different scaling factors. Try each and see which one is correct. The following variables are collected for sel735_meter.txt:

Variable          		Units
=====================================
AC Current 1     		A  
AC Current 2     		A  
AC Current 3     		A  
AC Current N     		A  
AC Voltage L1-N  		V  
AC Voltage L2-N  		V  
AC Voltage L3-N  		V  
AC Voltage L1-L2 		V  
AC Voltage L2-L3 		V  
AC Voltage L3-L1 		V  
AC Power 1       		W  
AC Power 2       		W  
AC Power 3       		W  
AC Power         		W  
Apparent Power 1 		VA 
Apparent Power 2 		VA 
Apparent Power 3 		VA 
Apparent Power   		VA 
Reactive Power 1 		VAR
Reactive Power 2 		VAR
Reactive Power 3 		VAR
Reactive Power   		VAR
Grid Freq        		Hz 

The following variables are collected for sel735_meter_new.txt:

Variable                				Units
=============================================================
Firmware ID           				     
Serial Number          			     
Meter ID           				     
Terminal ID	        			     
Meter Form           				     
Current Transformer Ratio      	     
Neutral Current Transformer Ratio       
Potential Transformer Ratio		     
Battery Status         			     
Temperature Status     			     
AC Current 1           					A    
AC Current 2           					A    
AC Current 3           					A    
AC Current N           					A    
AC Voltage L1-N        					V    
AC Voltage L2-N        					V    
AC Voltage L3-N        					V    
AC Voltage L1-L2       					V    
AC Voltage L2-L3       					V    
AC Voltage L3-L1       					V    
AC Power 1             					W    
AC Power 2             					W    
AC Power 3             					W    
AC Power               					W    
Apparent Power 1       					VA   
Apparent Power 2       					VA   
Apparent Power 3       					VA   
Apparent Power         					VA   
Reactive Power 1       					var  
Reactive Power 2       					var  
Reactive Power 3       					var  
Reactive Power         					var  
Grid Freq              					Hz   
Power Factor 1       				    
Power Factor 2       				    
Power Factor 3       				    
Power Factor         				    
Exported Energy L1					Wh   
Exported Energy L2					Wh   
Exported Energy L3					Wh   
Exported Energy						Wh   
Imported Energy L1					Wh   
Imported Energy L2					Wh   
Imported Energy L3					Wh   
Imported Energy						Wh   
Exported Apparent Energy L1				VA   
Exported Apparent Energy L2				VA   
Exported Apparent Energy L3				VA   
Exported Apparent Energy				VA   
Imported Apparent Energy L1				VA   
Imported Apparent Energy L2				VA   
Imported Apparent Energy L3				VA   
Imported Apparent Energy				VA   
Exported Reactive Energy L1				varh 
Exported Reactive Energy L2				varh 
Exported Reactive Energy L3				varh 
Exported Reactive Energy				varh 
Imported Reactive Energy L1				varh 
Imported Reactive Energy L2				varh 
Imported Reactive Energy L3				varh 
Imported Reactive Energy				varh 
Real Energy L1						Wh   
Real Energy L2						Wh   
Real Energy L3						Wh   
Real Energy						Wh   
AC Power Fundamental					Wh   
Apparent Power Fundamental				VA   

Arguments

Arguments are as follows:

  • endpoint. This is either a serial device like /dev/ttyS0 or an IP or DNS like 192.168.1.15

  • configuration file. This is the configuration file for the meter type. Choose from the list provided.

  • --bus_addresses. This is an optional parameter. A Modbus address in the range 2-255. This can be a hyphenated list like 3-10 or a list like 2,5,7,9

  • --port. This is an optional parameter used in an Ethernet gateway, and is the TCP port used for the gateway. Default is 502

  • --attempts. This is an optional parameter, and determines how many times to times to attempt to read an inverter value. Default is 1

  • --delay. This is the delay in seconds between inverter send and receive commands, AND if attempts > 1. Fractions like 0.3 can be used. Default is 0.05

  • --stop_on_any_command_fail. If this is specified, then any Modbus commands that fail will stop all further queries for all bus addresses and attempts.

  • --serial_lock. If this is set, the program can only be run one at a time (so as not to overload a Modbus device). If the device being queried is a serial device, this will automatically be set to "on". For IP addresses it is optional.

  • --sampling_rate. If this is defined, and the sampling rate is greater than 1, then all values listed above will be collected as an average. In other words; it will take a sample at the nominated frequency. After X samples defined by sampling_rate, a record will be written and sent to the cloud.

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