Danfoss ECL 2000, Руководство пользователя

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Service Settings
EY.65.H4.02
47
10.2.3 PI Constant Settings
This section describes the parameters you can set in pictures under the PI Constant
menu item.
Flow temp. control This group of settings determine how the flow temperature is controlled. The follow-
ing parameters can be set:
Display text Parameter Default value,
range Description
Neutr. zone Neutral zone Default value:
3 K
Range:
0-9 K
When the flow temperature lies within
the neutral zone, the valve motor is not
activated
P-band Proportional
band Default value:
70 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 pro-
portional band setting
Integr. time Integration
time Default value:
20 seconds
Range:
0-999 seconds
In case of a constant control error signal,
the motor will have moved by an amount
equal to that caused by the P-band after
the integration time has elapsed
When the integration time is set to 0, the
integral action is disabled
Return temp. limiter The controller can be set up to adjust the flow temperature if the actual return tem-
perature either:
•
Rises above the return temperature setpoint (maximum limiting)
or
•
Falls below the return temperature setpoint (minimum limiting).
The return temperature setpoint is calculated from the return temperature curve (see
page 23).
The following parameters can be set for this control function (see also page 48):
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:
30 min.
Range:
0-200 min.
Integration time