ABB i-bus
®
KNX
Parameters
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 253
7.8.1.1.3
Enable manual valve override
Options:
No
Yes
Manual valve override is enabled using this parameter. This feature is used to specify valve control
values directly; the control value from the controller is overridden. This action may be necessary
during the commissioning phase, for example, to test the function of the system. A further possible
application is the specific overriding of controller.
•
No
: The manual valve override is deactivated
•
Yes
: The manual override is enabled. The two group objects
Enable/disable manual override
valve A
and
Override valve control value
are enabled. The former is used to activate or deacti-
vate the manual override. The manual valve control value is specified using the second group
object. Only if the manual override has been activated via the first group object is the value in
the second group object sent to the valve. As soon as the manual override is ended using the
Enable/disable manual override valve A
group object, the valve output reacts again to the con-
troller (controller mode) or the control values received via the bus (actuator mode).
Note
As soon as the manual override is activated via the
Enable/disable manual override valve A
group object, the value currently in the
Override valve control value
group object is written to the
valve. If, while the override was disabled, a value was written to this group object, this value will
become active as soon as the override is enabled.
7.8.1.1.4
Valve purge
Options:
Deactivated
Automatic or triggered by object
Triggered by object
Valve purging by the device is enabled using this parameter. This parameter is used to trigger a
device opening and closing cycle during times when the valve is not in use to prevent the valve
from seizing.
•
Deactivated
: Valve purging is deactivated.
•
Automatic or triggered by object
: Valve purging can be triggered via a group object or it occurs
automatically after an adjustable time has elapsed. The group objects
Status Valve purge
and
Activate valve purge
as well as the parameters
Purge cycle in weeks
,
Reset purge cycle from
control value greater than or equal to
and
Send group object "Status Valve purge"
are enabled.
•
Triggered by object
: The valve purging can be triggered via a group object. The group objects
Status Valve purge
and
Activate valve purge
as well as the parameters
Reset purge cycle from
control value greater than or equal to
and
Send group object "Status Valve purge"
are enabled.
During the valve purging, the valve is opened completely once and closed again, corresponding to
the values set in the
Valve drive opening/closing time
parameter.
The purging cycle time is restarted if automatic valve purging has been activated at start-up of the
device.
The purging cycle time will be restarted at the end of the actual purging period. The parameterized
period of valve purging is included here.
The purging cycle with an active automatic valve purge is reset and restarted if:
•
A manual valve purge is triggered via the group object
Activate purge
.
•
The parameterized value (in Reset purge cycle from...) is exceeded. The purging cycle is only
restarted once the parameterized value is reached or exceeded.
