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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
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4.17 TV wire break detection
When one of the following three conditions is met, the device would send alarm signal and turn on the alarm
light.
1
）
As one line voltage is lower that 70V, and certain phase current is larger than 0.25A, the case can be used
to detect three-phase voltage loss and asymmetric wire breaks.
2
）
Negative-sequence phase voltage is larger than 8V, it can be used to detect TV asymmetric wire break. TV
wire break detection function could be operated or exited with control character KG2.1.
4.18 Measurement function
4.18.1 Calibration of measurement channel
1) Insert the energy measurement sub-board into CUP board, pay attention that the direction could not be
reversed. J1, J2 are respectively corresponding with J4, J5. Under normal operation, when measuring chip external
2.5V voltage reference, insert the three linking pieces of sub-board JP1 to near ON side.
When measuring self voltage reference, insert the three linking pieces of sub-board JP1 to far away from ON
side.
2) External AC terminal connection: current, series connected, voltage, connected symmetrically, symmetric
switch-on.
3) Offset check: No AC variables are added for external AC terminal. Enter “offset check” under the menu
\System Configuration\ Energy Measuring Configuration, in about ten seconds, under \Sampling\Measurement
Value, related current and voltage should all be 0 or near 0.
4) Gain check: Connect with current of 5A, line voltage of 100V. Under \System Configuration\ Energy
Examination Configuration menu, enter “Gain check”
，
in about ten seconds, under \Sampling\Measurement
Value, related current should be 5.000A, and related line voltage is 100V (error is within the scope of 0.2
％
.)
5) Under \System Configuration\ Energy Examination Configuration, first operate “Save configuration”, and
then operate “Energy clearance”.
6) Interrupt the device power, and then energize it again. Connect with current and line voltage. Under
\Sampling\Measurement Value, check the quantity of related current and voltage, confirm that the energy
measurement configuration is saved.
4.18.2 Display specification
Non-electric quantity 3
Under voltage
Non-electric quantity
