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EM4200 Energy Scaling Factors

Published date: 26 August 2019

Issue
What are energy scaling factors (multipliers) in EM4200?

Product Line
EM4200

Environment
EM4200 Modbus Register
PME Vista

Cause
Some Integer values must be multiplied by a scale factor (typically a fraction) to be read correctly. This is done to allow integer numbers to represent fractional numbers. The scale factor values are calculated by the meter when it is configured based on the Number of CTs, CT and PT ratios, etc. The scale factors only change if the meter configuration changes. There are scale factors for the integer Amps (I), Volts (V), Watts (W), and Energy (E) in the meter configuration area. The scale factor is a signed integer that translates to a multiplier to scale the integer to its units according to the following table:
 
Scale Factor I (Current)  integer
Range:
-10 to +10
4188
Scale Factor V (Voltage)  integer 4189
Scale Factor W (Power)  integer 4190
Scale Factor E (Energy)  integer 4191

     
Resolution
Register 4191 has the energy scaling factor. Once this register is read by a Modbus tester, then refer to the following table to find the multiplier:
 
Scale Factor Multiplier
-6 0.000001
-5 0.00001
-4 0.0001
-3 0.001
-2 0.01
-1 0.1
0 1
1 10
2 100
3 1000
4 10000
5 100000
6 1000000


NOTE: In case Power Monitoring Expert (PME) is installed, an alternative way to find the scaling factor is by referring to the devices diagram in Vista > Diagnostics tab.

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