YOKOGAWA CW120 - Meter Actions Upon Power Failure and Recovery

9-21
IM CW120-E
Electric Energy Measurement
9
9.7 Meter Actions upon Power Failure and
Recovery
The following describes the meter actions upon power failure and restoration
concerning data saving. None of the following actions upon power failure and
restoration takes place when a power failure has occurred during
instantaneous measurement.
● After Power Failure Occurred during Integration Standby State
• If the power is restored before the preset integration start time:
is displayed and the meter enters the integration standby state.
Pressing any key returns to the measurement screen, and integration will
start when the preset date and time is reached.
• If the power is restored after the preset integration start time:
is displayed and the meter starts integration immediately after
the power has been restored. Pressing any key returns to the
measurement screen.
Power Restoration Display
● If Power Failure Has Occurred during Integration
If data saving to the PC card is enabled (see Section 7.2.10), the active
electric energy, regenerative energy, elapsed time of integration, and date
and time of the power failure are saved. If a power failure has occurred during
the saving action, it will be aborted and the data will be invalid. (This may
result in destruction of the file.)
After the power restoration, the date and time of the restoration are saved,
is displayed, and integration restarts in the same conditions as
before the power failure. Pressing any key returns to the measurement screen.
Power Restoration Display