Mitsubishi Electric FR-A700 Instruction Manual page 546

Energy saving operation and energy saving monitor
Annual power saving amount, power charge (Pr. 899)
By setting the operation time rate [%] (ratio of time when the motor is actually driven by the
inverter during a year) to Pr. 899, the annual energy saving effect can be predicted.
When the operation pattern is predetermined to some degree, the estimated value of the annual
power saving amount can be found by measurement of the power saving amount during a given
measurement period. Refer to the following and set the operation time rate.
Predict the average time [h/day] of operation in a day.
Find the annual operation days [days/year]. (Monthly average operation days × 12 months)
Calculate the annual operation time [h/year] from
Annual operation time
Calculate the operation time rate and set it to Pr. 899.
Operation time rate [%]
Example Operation time rate setting example:
When operation is performed for about 21 hours per day and the monthly average operation
days are 16 days.
Annual operation time
Operation time rate [%]
Set 46.03% to Pr. 899.
Calculate the annual power saving amount from Pr. 899 "Operation time rate (estimated value)"
and power saving average value monitor:
Annual power saving amount [kWh/year]
The annual power saving amount charge can be monitored by setting the power charge per
hour in Pr. 896 "Power unit cost". Calculate the annual power saving amount charge in the
following method:
Annual power saving amount charge
NOTE
In the regeneration mode, make calculation on the assumption that "power saving = power
during commercial power supply operation (input power = 0)".
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= Average time [h/day]
Annual operation time [h/year]
------------------------------------------------------------------------------- -
=
×
24 [h/day] 365 [days/year]
×
= 21 [h/day] 16 [days/month]
4032 [h/year]
-------------------------------------------------------------------------- -
=
×
24 [h/year] 365 [days/year]
Power saving average value [kW] during
=
totalization when Pr. 898 = 10 or 9999
= Annual power saving amount [kWh/year]
and .
×
Operation days [days/year]
×
100 [%]
×
12 month = 4032 [h/year]
×
100 [%] = 46,03%
×
24h
Parameter
Pr. 899
× ×
365 days ------------------ -
100
×
Pr. 896