With this data, and the power consumption values from the specifications, we can estimate the amount of
energy that is used by the machine.
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
SP8941:
Condition
Machine
Status
Operating
001:
Operatin
g Time
002:
Stand by
Standby
(Ready)
Time
003:
Energy save
Energy
(Panel off)
Save Time
004: Low
Power
Low power
Time
005: Off
Mode
Off/Sleep
Time
Time at Start
Time at End
(min.)
(min.)
21089.0
21386.0
306163.0
308046.0
71386.0
75111.0
154084.0
156340.0
508776.0
520377.0
Running
Power
time
consumption
(hour)
Spec. (W)
( - )/
60 =
5.0
1081.8
31.4
214.0
62.1
214.0
37.6
146.0
193.4
7.0
Energy Save
Power
consumption
(KWH)
7
( x )/1000
=
5.35
6.72
13.29
5.49
1.35
569