ABB i-bus
®
KNX
Commissioning
FCA/S 1.x.x.1 | 2CDC508134D0202 119
3.2.3.5.2 Parameter window Characteristic curve
The characteristic curve is identical for Valve drive, thermoelectric (PWM); Valve drive, motor-driven (3-
point) and Valve drive, analog (0…10 V). The parameter window is enabled if the parameter Enable
characteristic curve has been selected with the option Yes in the Parameter window Function, p. 113.
In this parameter window, an adaptation of the valve drive to the valve that is employed can be undertaken
using the characteristic curve adjustment. A characteristic curve adjustment optimizes the control behavior
of the system if required.
A characteristic curve adjustment should only be undertaken in exceptional cases, and extensive
knowledge in heating, air-conditioning and ventilation systems is a prerequisite.
The following must be considered with the characteristic curve adjustment:
The value pairs can be entered in any sequence. They are sorted in ascending order of the control
value in the device, and intermediate values are interpolated.
If no value pair has been entered for the control value 0%, the valve position of the first value pair
applies for all control from 0 to the first value pair.
If no value pair has been entered for the control value 100%, the control values from the last value
pair up to 100% applies for the last value pair.
The parameter Cycle time of the PWM, see Parameter window A: Output (Valve drive, thermoelectric
(PWM)), p. 97 ff., serves as the basis for calculating activation of the output for the characteristic
curve, even if the control value is processed via a 1-bit value. This parameter is available only in the
operating mode Valve drive, thermoelectric (PWM).
Value pairs with the same control value can cause a non-defined characteristic curve. This fact must be
considered during parameterization.
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