Mitsubishi Electric 800 Series Instruction Manual page 369

(M) Monitor display and monitor output signal
Cumulative energy saving monitors ([6 Power saving amount], [7 Power
cost saving], [8 Annual power saving amount], [9 Annual power saving
savings]).
• On the cumulative energy saving cumulative monitors, the monitor data digit can be shifted to the right by the number of
Pr.891 Cumulative power monitor digit shifted times. setting. For example, if the cumulative power value is 1278.56
kWh when Pr.891 = "2", the PU/DU display is 12.78 (display in 100 kWh increments) and the communication data is 12. If
the maximum value is exceeded when Pr.891 = "0 to 4", the value is clamped at the maximum value, indicating that a digit
shift is necessary. If the maximum value is exceeded when Pr.891 = "9999", the value returns to 0, and the counting starts
again. In other monitors, the value is clamped at the displayed maximum value.
• The [6 Cumulative power saving amount] monitor (6)] can measure the power during a predetermined period. Measure with
the following procedure.
1) Write "9999" or "10" in Pr.898 Power saving cumulative monitor clear.
2) Write "0" in Pr.898 at the measurement start time to clear the power saving cumulative monitor value and start power
saving accumulation.
3) Write "1" in Pr.898 at the measurement end time to hold the power saving cumulative monitor value.
Power saving
instantaneous
value [kW]
Power saving
amount [kWh]
NOTE
• The power saving cumulative monitor value is saved every hour. This means that if the power is turned OFF after less than
an hour, when then the power is turned ON again, the previously saved monitor value is displayed, and accumulation starts.
(In some cases, the cumulative monitor value may go down.)
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).
368
PARAMETERS
Running
0
Accumulation
0
Accumulation start
(Pr.898=0)
110
100
Discharge side
90 damper control
(fan)
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90100110
During stop
Power is off
Pause
(Pr.898=1)
Commercial power-supply drive
Valve control
(pump)
Inlet damper control
(fan)
Ratio of speed to rating [%]
Running
Time
Time
Clear (Pr.898=0)
Resume accumulation
(Pr.898=10 or 9999)