Yokogawa PR300 Power and Energy Meter - Manual (Page 54)

Operation for Display of Measurement Items and Measurement Method
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4.7 Demand Measurement (Optional Measuring Function)
Operation for Demand Measurement
Demand measurement can be started and stopped by the operation key ( ) or via communication.
This section only explains control by the operation key (for operation via communication, refer to the
PR300 Communication Interface User’s Manual: IM77C01E01-10E). In the demand measurement mode,
either the demand power or the demand current can be measured. To set either of these, refer to
Section 3.8, “Setting Demand Measurement Conditions.”
Hold down for at
least 3 seconds.
Measured Value screen
Start demand measurement Stop demand measurement
Demand measurement starts.
The measured value is updated
every ten seconds.
Maximum demand value
Demand value
Hold down for at
least 3 seconds.
Turns on during
demand measurement.
Measured Value screen
Measured Value screen
Demand measurement stops.
During demand power or current
measurement
Does not turn on when
demand is not
measured.
Measured Value screen
Operation Operation Operation Operation
NOTE
●
Once the operation key is used for control to start and stop demand measurement, it is the only
means for controlling until system reset* is performed. The same applies to control via communica-
tion.
* System reset can be performed by turning off/on the power supply for the PR300 or by executing
remote reset via communication.
● When the system is reset, the measured values of demand, maximum demand, and demand alarm
status are reset to 0.
● If power failure occurs during measurement, the measured values of demand, maximum demand,
and demand alarm status are reset to 0.
Example operation to start/stop demand measurement
Data
update
Data
update
Time
These control signals are invalid.
Start
command
Stop
command
Start
command
Start
command
Stop
command
These control signals are invalid.
This control
signal is valid.
System reset
The demand in this
period is measured.
The demand in this
period is measured.
Start Start Stop Stop
Communication Communication
Communication