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9. CORRECT CONFIGURATION CHECK
If the meter configuration or wiring is not properly set, one of the following problems may occur:
A. The three phases have a negative sign
1. Check the direction of current, indicated by the arrow on each measurement CT: turn the CT by 180°
or reverse the CT connection if necessary (this solution is also recommended for a single-phase
connection)
B. One or two phases have a negative sign
1. Make the checks as per point A.
2. For each phase, make sure that the connections respect the relation between the current phase and
voltage phase. If the voltage-current relation is changed, a fixed 120° (advance or delay) offset is
introduced in the measurement. In such a case the PF should be incorrect, too.
C. The phase or system PF value is incorrect
1. Make the checks as per point B.
D. Inconsistent power values
1. Make the checks as per point B.
10. MAINTENANCE
The instrument is maintenance-free. Clean the display and keyboard regularly using a clean cloth and non-
aggressive cleaning liquid. Do not use solvents or detergents which may damage plastic parts.
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