ABB A43 User Manual page 295

Troubleshooting
Information
Information
I 2012
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I 2037
If any of the negative power warnings are active when not expected so or the
Error
energy consumption is suspected to be wrong it is recommended to check the
investigation
voltage, current, power and power factor values (under the menu Instantaneous
Values) which can give hints of what can be wrong in the installation. To know
what are reasonable values for power and power factors it is good to have
knowledge of the load to have an idea of what values to expect.
Especially with transformer connected meters there are a rather big risk with
installation errors. Current transformers can for example be connected with wrong
polarity or the phase connections can be mixed on the primary and/or the secondary
side. If the current and power values are low also check that the CT ratio is
correctly set and that the secondary terminals are not short circuited (which they
can be at installation to avoid high secondary voltages before or during installation
of the meter). The voltage phase connections can also be mixed.
Normal values for the total power factor and the phase power factors in 3-
element metering are values between 0.5 and 1.
Note that in 2-element-metering the power and the power factors in the two
elements can be significantly different if the load have a reactive component
(for example an inductive component like a motor). If the power factor for a
symmetrical load is less than 0.5 the power in one element can even be
negative. The total power should however be positive if the load consumes
energy and the total power factor should be reasonable.
2CMC48001M0201
Revision: C
Description
Alarm 1 active
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Alarm 25 active
295 A43/A44
User Manual