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14-2
IM CW240E
The CW240 includes a function for saving measurement data, setting values,
etc., if the power supply provided to the CW240 is interrupted during integration
measurement. The measurement data, setting values, etc., up to the point of
interruption are saved.
The CW240 switches automatically to battery operation if an alkaline dry cell or
a NiMH (nickel metal hydride) battery is installed.
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Saved Data
Set items are saved in the data save as indicated below.
• When the interval time is the standard interval (1 second to 60 minutes)
Mean value, minimum value, maximum value, electric energy, voltage
fluctuation: The values immediately previous to the power failure.
Demand value: The demand value one previous from the time of power
failure.
• When the interval time is a short interval (1 waveform to 500mS)
Mean value, minimum value, maximum value, electric energy, voltage
fluctuation: The values 10 seconds previous to the power failure.
Demand value: The demand value one previous from the time of power
failure.
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Operation after Power Recovery
Operation is as follows, according to the measurement status at the time of the
power failure and the time of recovery.
Integration Measurement
Power failure during
standby
Recovery before integration
measurement starts
Recovery after integration
measurement start time has
passed
Saves the date and time of the power failure along with the
measurement data from before the power failure, if the CW240 has
been set to save to the PC card or the internal memory.
Integration Measurement
Power failure during
integration
Displays the message screen, and
returns to standby. Starts integration
measurement when the set time has
been reached.
Displays the message screen, and
starts integration measurement
immediately after power failure recovery.
●
Message Display
The following message screen is displayed.
Measurement (internal operation) is continued even during message display.
Press any key to clear the message display.
Chapter 14 Power Failure Processing Function