TAC AB, Feb 2000
4:7
Special functions, P:16 -
TAC 200 User’s Manual
4.5.2 Limiting the power
To limit the power consumption the PI controller needs the following param-
eters.
P:24 Setpoint max-power kW
Required upper value for the power consumption.
P:26 Power limit control interval (minutes)
The controller uses this interval to measure and calculate the current power.
The interval must be chosen so that the number of pulses during the interval at
the maximum power rate will be 10 or higher. If chosen too short, the accu-
racy will be insufficient.
P:27 Power limit gain (°C/kW)
The value indicates how much the supply temperature must be lowered in
order to lower the power consumption with one kW.
P:28 Power limit I-time (minutes)
The integrating time should have a value similar to the time it takes for a
temperature change to affect the room.
4.6 Room temperature control
The room temperature is controlled via the supply water temperature, i e the
room temperature controller calculates an offset from the outdoor compen-
sated control curve and thus adjusts the supply water setpoint. The controller
has proportional (P) and integral (I) action with adjustable parameters.
The supply temperature setpoint (P:04) is calculated as the sum of values from
the outdoor compensated control curve (with a possible parallel displace-
ment), the morning boost (section 4.7) and the room temperature control
offset.
If there is a room sensor, the controller regulates the room temperature with
the following parameters, by parallel displacement of the control curve.
P:29 Room sensor authority
P:30 Room I-time (minutes)
P:31 Room deadzone (°C)
The influence of the room temperature on the supply temperature may,
however, be limited using the following limit values.
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