Mitsubishi Electric FR-F700PJ Instruction Manual page 185

Air-conditioning inverter
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Energy saving operation and energy saving monitor
(6) Annual power saving amount, power cost (Pr. 899)
 By setting the operation time rate [%] (ratio of time when the motor is actually driven by the inverter during a year) in 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.
1)Predict the average time [h/day] of operation in a day.
2)Find the annual operation days [days/year]. (Monthly average operation days  12 months)
3)Calculate the annual operation time [h/year] from 1) and 2).
Annual operation time (h/year) = Average time (h/day)
4)Calculate the operation time rate and set it to Pr. 899.
Operation time rate (%) =
REMARKS
 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 = 21 (h/day) 16 (days/month)  12 months = 4032 (h/year)
Operation time rate (%) =
Set 46.03% to Pr. 899.
 Calculate the annual power saving amount from Pr. 899 Operation time rate (estimated value) and average power saving
monitor
Annual power saving amount (kWh/year) =
 The annual power cost savings can be monitored by setting the power cost per hour in Pr. 896 Power unit cost.
Calculate the annual power cost savings in the following method.
Annual power cost savings = Annual power saving amount (kWh/year) 
REMARKS
In the regeneration mode, make calculation on the assumption that "power saving = power during commercial power supply
operation (input power = 0)".
Parameters referred to
Pr. 3 Base frequency
Pr. 52 DU/PU main display data selection
Pr. 54 FM terminal function selection
180
Annual operation time (h/year)
24 (h/day) x 365 (days/year)
4032 (h/year)
24 (h/day) 365 (days/year)
Refer to page 103
Refer to page 152
Refer to page 152
Operation days (days/year)

100(%)
100(%) = 46.03%
Average power saving (kW)
during accumulation when
Pr. 898 = 10 or 9999
Pr. 899
24h
365 days


100
Pr. 896

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