ABB i-bus KNX, Руководство по эксплуатации продукта, Страница: 121 / 264

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.
Important
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) .
Note
Value pairs with the same control value can cause a non-defined characteristic curve. This fact must be
considered during parameterization.