Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 370 / 727

(M) Monitor display and monitor output signal
PARAMETERS
369
5
GROUP
M
• 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.
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) .
4) Calculate the operation time rate and set it in Pr.899 .
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)

16 (days/month)

12 months = 4032 (h/year)
Operation time rate (%) =

100(%) = 46.03%
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.
• When the power cost per hour is set in Pr.896 Power unit cost , the annual power cost savings can be monitored.
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 page 347
Pr.54 FM terminal function selection page 357
Pr.158 AM terminal function selection page 357
Estimated consumed power during
commercial power supply operation (kW) = Pr.893 (kW)
 
Annual operation time (h/year) = average time (h/day)

number of operation days (days/year)
Operation time rate (%) =

100 (%)
Annual power saving amount (kWh/year) =

24h

365 days

Annual power cost saving = annual power saving amount (kWh/year)

Pr.896
100
Consumed power (%) Pr.892 (%)
100
Annual operation time (h/year)
24 (h/day)

365 (days/year)
4032 (h/year)
24 (h/day)

365 (days/year)
With Pr.898 = 10 or 9999,
average power saving (kW) during cumulative period
Pr.899
100