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How to calculate and configure the Zero and Full scale value for a PM8000 Analog Input
Issue
Configuring the analog input on a PM8000.

Product Line
PM8000 series

Environment
Meter Configuration

Cause
Unlike other ION devices, the PM8000 analog input is only rated for 4-20mA rather than 0-20mA.

Resolution
Per the ION Reference, the Zero Scale can be calculated as follow:

Zero Scale = FullScale - (FullScale - X)(Af - Ax)/(Af - Aa)

where
Aais the analog hardware output minimum range value.(For the PM8000, Aa is equal to 4 mA.)
Afis the analog hardware output maximum range value.(For the PM8000, Af is equal to 20 mA.)
Axis the analog hardware output minimum value.(For the PM8000, Ax is equal to 4 mA.)
Xis the scaled equivalent of Aa.(This is determined by the device sending the Analog signal.)

The previous equation can be simplified to:

Zero Scale = FullScale - (FullScale - X)*(Af - Ax)/(Af - Aa)
Zero Scale = FullScale - (FullScale - X)*(20 mA - 4mA)/(20 mA - 4mA)
Zero Scale = FullScale - (FullScale - X)
Zero Scale = X

Therefore, the Zero Scale should correspond with the 4mA value.

For example, if a PM8000 meter is monitoring a 0 to 120 kW system and receiving the power information via a 4 - 20 mA analog signal, the PM8000 would need to be configured to have a Zero Scale of 0 and a Full Scale value of 120.

For instructions on programming the Zero Scale and Full Scale values, see attachment below.
Note: From firmware v3.0.0 the PM8000 has an optional Analog I/O (METSEPM890024) version 001.002.000 for 4-20 mA and 0-20 mA.

Schneider Electric USA

Attachment(s)
Zero Scale and Full Scale values instructions.docx [75.93 KB]
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