ABB i-bus KNX Product Manual page 100

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ABB i-bus KNX
Commissioning
Reaction after bus voltage recovery
Options:
This parameter determines the reaction of the output at bus voltage recovery.

Unchanged: The last valve control is restored.

Select: A value is determined. Active priorities override the parameterized control.
98 2CDC508134D0202 | FCA/S 1.x.x.1
Unchanged
Select
Dependent parameter:
Control value in % [0...100]
Options: 0...100
This parameter determines the control of the output after bus voltage recovery in %.
Note
If the control value is received via a 1 bit value, a value must be entered in the parameter Cycle
time of PWM in s [10...6,000]. This value is used as the basis for calculation of the output control
at bus voltage recovery in %.
Note
Control value in %
The actual valve setting in % may diverge from the set value for control in % depending on the
ambient conditions, e.g. room temperature, valve drive used, water pressure in the
heating/cooling system, valve, etc.
The set value in the parameter Control value in % is based on the parameter Cycle time of
PWM. The output is controlled accordingly depending on the setting.
Example parameter settings:
Control value in % [0...100]:
Cycle time of PWM in s [10...6,000]:
With these settings, the output switches ON for 42 s and OFF for 18 s (60 s x 0.7 = 42 s).
Quick heat up/cool down
An additional time is determined that is dependent on the change in the control value and the
closing and opening times of the valve drive. This additional time extends the switch on and off
duration after a change in the control value. Accordingly, the new control value is achieved
quickly.
70%
60 s