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
Date
Power
Consumpt
ion (W):
Data: a
SP8941:
Machine
Status
Start Time:
(min.)
Data: b
End Time:
(min.)
Data: c
Time
Differences
(Data:b -
Data: c)
(min.)
Data: d
Power
Consumption
(Data:a x
Data:d)
(Wmin.)
Data: e
Operating
mode 1081.8
001:
Operatin
g Time 21089.0 21386.0 297.0 321294.6
Ready
mode
(stand by) 214.0
002:
Standby
Time 306163.0 308046.0 1883.0 402962.0
Energy
mode 214.0
003:
Energy
Save
Time
71386.0 75111.0 3725.0 797150.0
Off/Sleep
mode 7.0
005:
Off mode
Time 508776.0 520377.0 11601.0 81207.0
Total Time of Data: d (min.) 17506.0
Energy Save
129
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