YOKOGAWA WT500 User Manual page 144

5.6 Integration
5-18
Display Resolution
The maximum display resolution for an integrated value is 999999. When an integrated
value reaches 1000000 counts, the decimal point shifts automatically. For example, if
0.001 mWh is added to 999.999 mWh, the display shows 1.00000 Wh.
Display When Integration Overflow Occurs
If either of the conditions below is met, integration is stopped, and the integration time
and integrated value are held.
• The integration time reaches the maximum integration time (10000 hours).
• The integrated value of WP, q, WS, or WQ reaches the maximum or minimum
displayable value given below.
Maximum and Minimum Displayable Integrated Values
Active power (WP):
Current (q):
Apparent power (WS):
Reactive power (WQ):
Integration When the MAX Hold Feature Is Enabled
The integrated value is determined and displayed by summing the value that is measured
at every display update rate, irrespective of the MAX hold feature (section 5.12 for
details).
Integration When the Measured Value Exceeds the Measurement Limit
If a sampled instantaneous current or voltage exceeds the maximum or minimum
measurement range limits of the AD circuit, the value is measured as the maximum or
minimum measurement range limit value.
Integration When Current Input Is Small
Integration is performed assuming a current of zero when the current input relative to the
measurement range is as indicated below.
• When the crest factor is set to 3
When Irms or Iac is less than or equal to 0.5% or Imn or Irmn is less than or equal to
2%
• When the crest factor is set to 6
When Irms or Iac is less than or equal to 1.0% or Imn or Irmn is less than or equal to
4%
Backup When a Power Failure Occurs
• If a power failure occurs when integration is in progress, the integration result is held.
When the power returns, integration stops, and the integration result calculated up to
the point when the power failure occurred is displayed.
• After the power returns, you must reset integration to start it again.
±999999 MWh
±999999 MAh
±999999 MVAh
±999999 Mvarh
IM 760201-01E