This should only be used as a reference value, because the power consumption specifications are
measured in a controlled environment with a constant power supply.
To get an exact measurement at the customers site, a watt meter must be used to measure the actual
energy consumed.
To use SP8941 to calculate the energy consumed:
• At the start of the measurement period, read the values of SP8941 001 to 005.
• At the end of the measurement period, read the values of SP8941 001 to 005 again.
•
Find the amount of time spent in each mode (subtract the earlier measurement from the later
measurement).
• Multiply this by the power consumption spec for each mode.
• Convert the result to kWh (kilowatt hours)
Here is an example calculation.
Machine
Condition
SP8941:
Machine
Status
Time at
Start (min.)
Time at End
(min.)
Running
time
(hour)
( - )/
60 =
Power
consumption
Spec. (W)
Power
consumption
(KWH)
( x )/1000
=
Operating 001:
Operatin
g Time 21089.0 21386.0 5.0 1081.8 5.35
Stand by
(Ready)
002:
Standby
Time 306163.0 308046.0 31.4 214.0 6.72
Energy save
(Panel off)
003:
Energy
Save
Time 71386.0 75111.0 62.1 214.0 13.29
Low power
004: Low
Power
Time 154084.0 156340.0 37.6 146.0 5.49
Off/Sleep
005: Off
Mode
Time 508776.0 520377.0 193.4 7.0 1.35
Total 32.20
Energy Save
351
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