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1.3 Explanations of Power Proportional Distribution 45

ED721208 Power Proportional Distribution (PPD)

(2) The way to reduce errors

The error  cannot be reduced, however this error is small and negligible, therefore so it can generally clear troubles if

excusing the reason caused to tenants.

The way to reduce the error  will be described as follows.

As shown in the drawing below, when the relation between a watthour meter and indoor units are clear, “Power group

setting” for each watthour meter can reduce the error.

On the above example, watts at W1 and watts at W2 are shared by indoor units #1~#5 and indoor units #6~#8,

respectively.

The above setting results in the followings:

W1 Count conclusive total for indoor unit #1~#5

W2 Count conclusive total for indoor unit #6~#8

Caution:

If management staff checks the watts in the procedure mentioned below, they would find the calculation to be incorrect

due to an uncompleted cycle.

Example:

(1) May/24th, read watthour meter and records the watts at 10:00 am

(2) June/24th, read watthour meter and records the watts at 10:00 am

(3) When the count in a period of May/24th to June/23rd is printed out, the total value does not meet the value detected

mentioned above on (2) - (1).

iTM stores the information collected in a period of 0:00 am through 23:59 pm as one day information as shown above.

It results in the fact that there are ten hours gaps between on the first day of the counting and on the last day of the count

in the above mentioned column of “Result of detection by management staff” and “Count result”.

As shown in the figure above, this error increases in the season from the intermediate forwarding to the season in which

air-conditioning is highly required.

For more accuracy, it is necessary to compare with the value detected at 0:00 am.

Power supply

3 phase

#1 #2 #3

#6 #7 #8#4 #5

Outdoor unit

Tenant A Tenant CTenant B

iTM

Count result of iTM

Result of detection by management staff

Large

5/24

0:00 10:00

Detection (1)

10:00

Detection (2)

23:59

5/24 6/22 6/24

Little