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NORMA 4000/5000
Operators Manual
5-8
Aron Circuit (2-Wattmeter Method, W2)
Direct Connection
The Aron circuit is only available for 3-wire networks, see Figure 5-5. It is only required
to measure two phases (currents I1 and I2 in the following connection diagrams), as
I1+I2+I3 must be 0.
Note
In most cases, the Aron circuit is not acceptable for measurements on
inverters, as there are capacitive leakage currents from the windings to the
housing.
• Ensure that there is no overload at the current input of the Power
Analyzer.
• If necessary, install appropriate fuses.
To select the Aron, or 2-wattmeter, Method, go to General Setup and select W2. Select
channels 2 and 3 for the connections. For more information, see Chapter 7,
“Configuration.”
Scaling transformers for voltage and current may be used in this mode but care needs to
made in identifying the correct channel and measurement index information.
Note
The W2 mode is not provided for the second set of three phase inputs with
the 4 or 6 channel versions of the NORMA 5000.
XW Warning
To avoid possible electric shock or personal injury:
• Risk of injury when touching connections, internal circuits,
and measuring devices that are not connected to earth
ground.
• Always adhere to the instructions regarding the sequence of
connection (see Chapter 5, “Connecting Sequence”).
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