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(5) Power estimated value of commercial power supply operation (Pr. 892, Pr. 893, Pr. 894)
Select the commercial power supply operation pattern from among the four patterns of discharge damper control
(fan), inlet damper control (fan), valve control (pump) and commercial power supply drive, and set it to Pr. 894
Control selection during commercial power-supply operation.
Set the motor capacity (pump capacity) in Pr. 893 Energy saving monitor reference (motor capacity).
The power consumption rate (%) during commercial power supply operation is estimated from the operation
pattern and the ratio of speed to rating (current output frequency/Pr. 3 Base frequency) in the following chart.
From the motor capacity set in Pr. 893 and Pr. 892 Load factor, the power estimated value (kW) during commercial
power supply operation is found by the following formula.
Power estimated value (kW) during commercial power supply operation
REMARKS
Since the speed does not increase above the power supply frequency in commercial power supply operation, it becomes
constant when the output frequency rises to or above Pr. 3 Base frequency.
Energy saving operation and energy saving monitor
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 [%]
Power consumption (%)
= Pr. 893 (kW)
Pr. 892 (%)
100
100
4
151

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