Parameter description:
P1: Setpoint / DeltaW for control circuit 2
Adjusting the setpoint of control circuit 2.
If A5=1, the setpoints for control circuit 1 and 2 are linked with one another via switching difference
DeltaW, which can be adjusted with P1. (operation with DeltaW)
The following applies: setpoint thermostat 2 = setpoint control circuit 1 + delta W2.
This difference can take positive or negative values. Thus, a leading or following contact can be
realised.
P2: Hysteresis contact K1
P3: Hysteresis contact K2
The hysteresis can be set symmetrically or one-sided at the setpoint (see A40, A41).
At one-sided setting, the hysteresis works downward with heating contact and upward with cooling
contact. At symmetrical hysteresis, half of the hysteresis’ value is effective below and half of the
value above the switching point (see fig. 1 and 2).
Fig. 1:
Heating controller, one-sided hysteresis
Fig. 2:
Cooling controller, symmetrical
hysteresis
The hysteresis is only effective if thermostatic mode is enabled, in case of PID characteristic it is
ineffective.
P4: Control range limitation – minimum setpoint
P5: Control range limitation – maximum setpoint
The adjustment range of the setpoint can be limited in both directions. This is to prevent the end
user of a unit from setting inadmissible or dangerous setpoints.
P7: Proportional band at PID regulation
The proportional part works in such a way that with approximation of the actual value to the
setpoint the variable is reduced linearly from +-100% to 0%.
P8: Reset time Tn (Integral-portion)
The proportional controller as such has a remaining deviation of the actual value from the setpoint.
The integral portion provides for a complete compensation of this offset
The reset time is a measure for the period of time needed to adjust a remaining temperature
deviation of the size of the proportional range.
If a small reset time is set, a fast post-adjustment will take place. At a too small reset time,
however, the system may tend to vibrate
Summary of Contents for 900219.092
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