Spirax Sarco SP8-10, Инструкция по установке и обслуживанию

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IM-P707-01 CTLS Issue 1
61
SP8-10 Smart positioner
5.1.22 Menu: Controller
Menu/parameter Value range Description
Zone 1 to 100 in steps of 1
This parameter specifies the point at which the control
structure is switched over when the dead band is being
approached.
Note:
On valves where slip-stick effect is significant, valve
vibration can be reduced by increasing the value of the
‘Zone’ parameter.
Dead Band
0.10 to 10.00 % in steps
of 0.01 %
The dead band defines a +/− range around the position
set point. Once the valves and fittings reach this range,
the positioner maintains this position.
Dead Band Calc. Active, inactive
Use this function to activate/deactivate the control
behavior on the dead band.
DB Approach
Fast
Medium
Slow
This parameter specifies the speed at which the dead
band is approached. In rare cases, overshooting can
occur when the valve position is being compensated.
This can be prevented by reducing the speed of the
dead band approach (DB Approach).
DB Control time 0 to 30 s
In some cases it can happen that the valve continues
moving slowly after reaching the dead band and leaves
the dead band again. To prevent this, this parameter
can be used to specify how long the controller should
be active after reaching the dead band.
Factory setting : 0 s
DB Close-Up Range 0 to 1000 s.
Use this parameter to enter a monitoring time up to the
point at which the dead band is reached.
When the dead band is exceeded, the monitoring time
is started. If the dead band around the new position set
point is not reached again within the specified time, an
alarm is triggered.
Once the set point has been reached, the alarm is
automatically reset.
Note:
-
With active shutoff there is no alarm message.
Once the set point has been reached, the alarm is
automatically reset.
-
The monitoring stroke time is determined during
automatic adjustment. Selecting a value of ‘0 s’
deactivates this parameter.