Mitsubishi Electric FR-E800 Series Instruction Manual page 292

NOTE
• Setting example for operation time rate: In the case where the average operation time per day is about 21 hours and the
average operation days per month is 16 days.
Annual operation time = 21 (h/day) × 16 (days/month) × 12 (months) = 4032 (h/year)
Operation time rate (%) =
Therefore, set 46.03% in Pr.899.
• Calculate the annual energy saving from the value of [3 Average power saving] cumulated according to the setting of
Pr.899 Operation time rate (estimated value).
Annual power saving amount (kWh/year) =
• When the power cost per hour is set in Pr.896 Power unit cost, the annual energy cost savings can be monitored.
The annual energy cost savings is determined by calculation using the following formula.
Annual power cost saving = annual power saving amount (kWh/year) × Pr.896
NOTE
• During regenerative driving, substitute the output power during the commercial power supply operation for the saved power
(therefore, input power = 0).
Parameters referred to
Pr.3 Base frequencypage 428
Pr.52 Operation panel main monitor
Pr.54 FM terminal function selectionpage 279
Pr.158 AM terminal function selectionpage 279
4032 (h/year)
24 (h/day) × 365 (days/year)
With Pr.898 = 10 or 9999, average power
saving (kW) during cumulative period
selectionpage 270
× 100(%) ＝ 46.03%
× 24h × 365 days ×
12. (M) Item and Output Signal for Monitoring
12.5 Energy saving monitoring
11
12
13
14
Pr.899
100
15
16
17
18
19
20
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