Energy Save Effectiveness
D117/D118 7-2 SM
Recommendation
We recommend that the default settings should be kept.
 If the customer requests that these settings should be changed, please explain that their
energy costs could increase, and that they should consider the effects on the environment of
extra energy use.
 If it is necessary to change the settings, please try to make sure that the Auto Off timer is not
too long. Try with a shorter setting first, such as 30 min., then go to a longer one (such as 60
min.) if the customer is not satisfied.
 If the timers are all set to the maximum value, the machine will not begin saving energy until
240 minutes has expired after the last job. This means that after the customer has finished
using the machine for the day, energy will be consumed that could otherwise be saved.
 If you change the settings, the energy consumed can be measured using SP8941, as
explained below.
7.2 ENERGY SAVE EFFECTIVENESS
SP 8941 (Machine Status) keeps a record of the amount of time that the machine spends in each
mode.
 8941-001: Operating mode
 8941-002: Standby mode
 8941-003: Panel off mode (Not used in this model)
 8941-004: Low power mode (Not used in this model)
 8941-005: Sleep mode
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.
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