Mitsubishi Electric 800 Series Instruction Manual page 296

 Estimated power value in commercial power supply operation (Pr.892,
Pr.893, Pr.894)
• Select the pattern for commercial power supply operation from the four patterns of discharge damper control (fan), suction
damper control (fan), valve control (pump) and commercial power driving, and set it in Pr.894 Control selection during
commercial power-supply operation.
• Set the motor capacity (pump capacity) in Pr.893 Energy saving monitor reference (motor capacity).
• As shown below, the consumed power ratio (%) during commercial power supply operation is estimated from the rotations
per minute ratio for each operation pattern and rating (current output frequency/Pr.3 Base frequency).
• 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.
Commercial power-supply drive
110
100
Discharge side
90 damper control
(fan)
80
Valve control
70
(pump)
60
50
Inlet damper control
40
(fan)
30
20
10
0
0 10 20 30 40 50 60 70 80 90100110
Ratio of speed to rating [%]
Consumed power (%)
= Pr.893 (kW) ×
Pr.892 (%)
×
100 100
5. PARAMETERS
5.8 (M) Monitor display and monitor output signal
3
4
5
5
5
6
7
8
9
10
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