Emerson Bettis Q Series Reference Manual page 26

4.2.3.2 CFG_SWITCH_POINTS
The Bettis Q-Series QC54 Control module will be
™
shipped with the default feedback characteristic, as
per figure 4.3. This feedback characteristic is opera-
tional after initialization (see chapter 3) and is suitable
for most applications.
Default setting
after initialization
End
Switch point
position
10˚max
offsets
10˚max
End
position
Fig. 4.3 Feedback characteristic
If the default configuration is not sufficient for your ap-
plication, the switch points can be configured.
For the QC54 Module, there are three topics concern-
ing the configuration of the switch points.
1 Mechanical limit stops.
Normally the mechanical limit stops limit the stroke
of the actuator. (To adjust the mechanical limit
stops see DOC.IOM.Q.1 chapter 3).
If the mechanical limit stop setting is changed, or
the valve does not reach the fully open or closed
positions (due to wear in the valve), the Open and
Closed end positions have to be re-configured to
assure position feedback.
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Reference manual F
Adjustable
range
5˚
30˚
30˚
5˚
Fieldbus Control module
OUNDATION
2 "Open" and "Closed" end positions.
There are two procedures to re-configure the end
positions:
1 If it is safe to cycle the actuator, perform the initial-
ization procedure (see §3.2).
2 If it is not safe to cycle the actuator, perform the
following re-assignment procedure:
1 Go to Configure/Manual Setup/Switch Points/
Change Switch Points.
2 In case the "Open" position needs an update:
Set sub parameter OPEN_END_POSITION of
parameter CFG_SWITCH_POINTS to:
"set to current position".
3 In case the "Closed" position needs an update:
Set sub parameter CLOSED_END_POSITION
of parameter CFG_SWITCH_POINTS to:
"set to current position".
3 "Open" and "Closed" stop offset.
The "Open" or "Closed" offset value is the number
of degrees before the end of stroke within which
the switches will be activated or deactivated. De-
fault values for both positions are (see figure 4.1):
- Default offset
- Adjustable range
Sub parameters OPEN_STOP_OFFSET and
CLOSED_STOP_OFFSET can be used to change
the end stop offsets and can be set per ° (degree)
DOC.RM.BQC54.E Rev: 1
February, 2016
10° before end of stroke.
5° to 30° before end of
stroke