Hioki 3166 - Page 59

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4.5 Checking for Incorrect Wiring
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CAUTIO
N
・Execute this function as needed.
・Incorrect wiring will not be detected properly on special types of lines, such
as lines carrying power flows or lines that are used both to power machinery
and lighting equipment.
・Even if the sampling method is PLL sync, always set the frequency of the
line being measured on the setting screen. (If settings are not made, a
incorrect wiring will not be detected properly.)
NOTE
4
.5 Checking for Incorrect Wiring
・Cannot be executed during integrated or demand measurement (including
while the 3166 is in standby), or while there is any measurement data in
memory. Perform a data reset first, and then execute.
・During the check for incorrect wiring, the voltage and current ranges are both
set to "fixed" range.
・When measuring a three-phase, three-wire, three-current (3p3w3i), the third
channel of clamp on sensor reversed connection will not be detected.
・A incorrect wiring may not be detected properly if more than one incorrect
wiring occurs at once; if the voltage and current levels are low; or if the power
factor is close to zero. On the Instantaneous Value screen, check the displayed
value for abnormality.
(1) Operating procedure
1. On the "Wiring Check" screen, press the
EXEC. function key.
The "Checking Item" window is displayed and the items are checked in
sequence automatically.
The checking items are automatically selected from among the following,
according to the wiring setting.
Voltage input present or not
Voltage input level imbalance (for settings other than single-phase, two-
wire)
Discrimination between single-phase, three-wire line and three-phase,
three-wire line (for single-phase, three-wire setting and three-phase, three-
wire setting)
Phase sequence check (for three-phase settings)
Current input present or not
Clamp on sensor reversed connection
While the checking operation is in progress, the message "Checking" is
displayed on the screen. The results of each check are displayed as "○" (no
incorrect wiring found) and "×" (incorrect wiring found).