Danfoss ECL 2000, User Manual

Page: 64 / 106

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