Pi Constant Settings - Danfoss ECL 2000 User Manual

Service Settings

10.3.3 PI Constant Settings

Flow temp. control
Return temp. limiter
58
This section describes the settings in pictures under the PI Constant menu item.
These settings determine how the flow temperature in the hot-water circuit is con-
trolled:
Display text Parameter
Neutr. zone Neutral zone
P-band Proportional
band
Integration
Integr. time
time
It is possible to set up the controller to reduce or increase the flow temperature of the
hot-water circuit if the return temperature rises above or falls below a user-defined
setpoint (see also page 59).
The following PI constant settings apply to this function:
Display text Parameter
Amplification
Integr. time Integration
time
EY.65.H4.02
Default value, Description
range
Default value: When the flow temperature lies within
3 K the neutral zone, the valve motor is not
activated
Range:
0-9K
Default value: Indicates the amplification in the control
50 K loop. If the flow temperature deviates
from the reference temperature, the mo-
Range:
tor will be positioned proportionally to
1-99 K
the temperature deviation and the P-band
setting
Default value: In case of a constant control error signal,
15 seconds the motor will have moved by an amount
equal to that caused by P-band after the
Range:
integration time has elapsed
0-999
When the integration time is set to 0, the
integral action is disabled
Default value, Description
range
Default value: Amplification for return limiter
–0.3 K
Range:
–25.0 - 25.0 K
Default value: Integration time
15 min.
Range:
0-200 min.