Samsung DVM PLUS III Technical Data Book page 638

05-3_control systems(082~141)
Control Systems
3 Integrated management system
3
3-1. DMS (Data Management Server)
❺
What if the room temperature begins to reach the set temperature?
If the room temperature begins to reach the set temperature, the indoor unit does not have to extract the full
refrigerant amount to keep the set condition. Capacity from the indoor unit goes down to indicate the outdoor
unit that it does not need refrigerant at the full capacity state.
When the room temperature has reached the set temperature, there is no need to pump the refrigerant into
the indoor unit. Indoor unit goes into the thermally OFF state and sends capacity of zero value to the outdoor
unit and the DMS, which results in fan or stand-by power distribution only.
❻
Capacity accumulation and power distribution
DMS gathers power consumption and capacity values during one-day.
At midnight, 1-day power consumption is distributed to the indoor units using the gathered information.
00:00
During 24 hours,
1. Reads every indoor unit operation
2. Reads watt-hour meter value
3. Accumulates 3 capacity values
❼
Undesirable situation protection
Even when there occurred communication error between the DMS and SiMs or DMS can no longer gather
power consumption, DMS stores power distribution ratio for all indoor units. As soon as communication
between them resumes and power information is transmitted to the DMS, power distribution during the
interrupted period is recovered as normal condition.
❽
Not equal stand-by power distribution (In case all the indoor units are stopped)
Since there always exists error in each power consumption amount, distributed stand-by power may not be
equal for different air-conditioning system. But the difference is so small that it is negligible.
V-106
3/6/08 14:04 Page 106
24-hour
Run Stop Stop
A B C
1. Calculates consumed power for 1 day.
2. Calculates accumulated capacity values
3. Distributes 1-day power consumption
4. Clears accumulated capacity values
Stop Stop
D E
24:00
B = C, D = E
But B might be not equal to D.