Energy Save Effectiveness - Ricoh D131 Service Manual

7.1.2 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

8941-004: Low power mode

8941-005: Off/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.
Machine Power
Date Consumption
(W):
Data: a
Operating
mode 1081.8
Ready
mode
(stand by) 214.0
SM
SP8941:Machine Start
Status Time:
(min.)
Data: b
001: Operating
Time 21089.0
002:
Standby Time 306163.0 308046.0
7-3
End Time
Time: Differences Consumption
(min.) (Data:b -
Data: c Data: c)
(min.)
Data: d
21386.0 297.0
1883.0
D131/D132/D133
Energy Save
Power
(Data:a x
Data:d)
(Wmin.)
Data: e
321294.6
402962.0