Mitsubishi Electric 800 Series Instruction Manual page 370

• The estimated value of the consumed power during commercial power supply operation (kW) is calculated from the motor
capacity set in Pr.893 and Pr.892 Load factor with the following formula.
Estimated consumed power during
commercial power supply operation (kW)
NOTE
• In commercial power supply operation, because the rotations per minute cannot rise higher than the power supply frequency,
if the output frequency rises to Pr.3 Base frequency or higher, it stays at a constant value.
Annual power saving amount and power cost savings (Pr.899)
• When the operation time rate [%] (ratio of time in year that the inverter actually drives the motor) is set in Pr.899, the annual
energy saving effect can be estimated.
• When the operation pattern is determined to a certain extent, the estimated value of the annual power saving amount can
be calculated by measuring the power saving in a certain measurement period.
• Refer to the following to set the operation time rate.
1) Estimate the average time of operation per day [h/day].
2) Calculate the number of operation days per year [days/year]. (Average number of operation days per month  12
months)
3) Calculate the annual operation time [h/year] from 1) and 2).
Annual operation time (h/year) = average time (h/day)  number of operation days (days/year)
4) Calculate the operation time rate and set it in Pr.899.
Operation time rate (%) =
NOTE
• Setting example for operation time rate: When operation is performed about 21h per day for an average 16 operation days
per month,
Annual operation time = 21 (h/day)
Operation time rate (%) =
Set 46.03% in Pr.899.
• Calculate the annual power saving amount from Pr.899 Operation time rate (estimated value) and the average power
saving monitor.
Annual power saving amount (kWh/year) =
• When the power cost per hour is set in Pr.896 Power unit cost, the annual power cost savings can be monitored.
Annual power cost saving = annual power saving amount (kWh/year)  Pr.896
NOTE
• During regenerative driving, make calculation on the assumption that "power saving = power during commercial power
supply operation (input power = 0)".
Parameters referred to ???????
Pr.3 Base frequency page 591
Pr.52 Operation panel main monitor selection
Pr.54 FM terminal function selection
Pr.158 AM terminal function selection
= Pr.893 (kW)
Annual operation time (h/year)
24 (h/day)  365 (days/year)
 
16 (days/month)
4032 (h/year)

24 (h/day) 365 (days/year)
With Pr.898 = 10 or 9999,
average power saving (kW) during cumulative period
page 347
page 357
page 357
(M) Monitor display and monitor output signal
Consumed power (%)

100
 100 (%)
12 months = 4032 (h/year)

100(%) = 46.03%
Pr.892 (%)

100
Pr.899
 24h  365 days 
100
369
PARAMETERS
5
GROUP
M