Energy Save Mode

Customers should use energy saver modes properly, to save energy and protect the environment.

The area shaded grey in this diagram represents the amount of energy that is saved when the timers are at the default settings. If the timers are changed, then the energy saved will be different. For example, if the timers are all set to 240 min., the grey area will disappear, and no energy is saved before 240 min. expires.

Timer Settings

The user can set these timers with User Tools (System settings > Timer setting)

• Energy saver timer 1-240 min.: Low Power Mode. Default setting: 15 min.
• Auto off timer 1-240 min.: Off/Sleep Mode. Default setting: 60 min.

Normally, Energy Saver timer < Auto Off timer. But, for example, if Auto Off timer < or = Energy Saver timer, the machine goes immediately to Off mode when the Auto Off timer expires. It skips the Energy Saver mode.

Example

• Low power: 15 min.
• Auto Off: 1 min.
• The machine goes to Off mode after 1 minute. Low Power mode is not used.

Return to Stand-by Mode: Low Power Mode

The recovery time depends on the model.

Return to Stand-by Mode: Off/Sleep Mode

Recovery time: 360 sec. or less

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.

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.