Mitsubishi Electric ME96SSEB-MB, Руководство пользователя

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5. Operation
5.1. Basic Operation
5.1.10. How to Reset Active/Reactive/Apparent Energy to Zero
Pressing , , and simultaneously for 2 seconds resets active, reactive, and apparent
energy values to zero.
When password protection is enabled, the values are reset after you enter the password.
In addition, communication function enables to reset all active, reactive, and apparent energy values to zero.
In this case, password input is not necessary.
Note1: This function is available on the present value screen only.
Note2: The values that are not displayed on the screen will be also all reset to zero.
5.1.11. How to Measure Reactive Energy (2 quadrant/4 quadrant measurement
）
For measurement of reactive energy, there are two types on how to take a quadrant as follows.
The measurement method of reactive energy can be switched at the active/reactive energy measurement
setting in the setting menu 3.
In addition, when you set to IEC mode in the setting menu 8, 2 quadrant measurement is executed even if you
set to
‘Combination
Ⅲ
’ or ‘Combination
Ⅳ
’, which executes 4 quadrant measurement, at the active/reactive
energy measurement setting.
When you select 4 quadrant measurement and IEC mode at each setting,
‘Imported lag’ and ‘Exported lead’ of
reactive energy are displayed on the additional screen. However, they are not integrated.
For details on how to switch 2 quadrant/4 quadrant measurement, refer to
3.4 .
For details on how to switch the IEC mode setting, refer to 3.9 .
Measurement
method
Description
4 quadrant
measurement
Each of four quadrants (Imported lag, Imported lead, Exported lag, and Exported lead)
is measured as one division. It is suitable to measure systems with a private power
generator. However, a dead region occurs at the boundary of each division. Accordingly,
reactive energy cannot be measured at where power factor is near 1 or zero.
2 quadrant
measurement
‘Imported lag’ and ‘Exported lead’ are measured as one division, and in the same way,
‘Imported lead’ and ‘Exported lag’ are measured as one division. Therefore, a dead
region does not occur at where power factor is near zero, and reactive energy can be
measured even there. It is suitable to measure systems without a private power
generator and reactive energy of capacitor load where power factor is zero generally.
SET RESET PHASE
＋W －W
＋var
－var
＋W －W
＋var
－var
<4 quadrant measurement> <2 quadrant measurement>
Exported
lag Imported
lead
Exported
lead Imported
lag
Exported
lag Imported
lead
Exported
lead Imported
lag