Limit Switch Setting - Emerson Bettis Q Series Installation Manual

Bettis Q-Series
February 2017

5 Limit switch setting

5.1 Factory settings
Mechanical stroke : 90°±0.5° (Actuator setting)
Switch points : ± 15° before each end of
stroke (open and closed
position, see fig 5.1).
Adjustable range : See chapter 4.2 for the
applicable switch type.
Switch points
15°
max
Open
Factory settings
Fig. 5.1 Adjustable range and factory settings
If required the mechanical stroke and the limit
switch setting can be re-adjusted.
- For mechanical stroke adjustment please see
document DOC.IOM.Q.E, available from
www.emersonprocess.com/bettis
- For re-adjusting the limit switches, see
procedure below.
5.2 Before re-adjusting the limit switches.
IMPORTANT
* Before mounting the actuator on the valve, be
sure that both the actuator and the valve have
the same "open" or "closed" position.
* Set the Mechanical stroke before setting the
limit switches.
5.2.1 Pneumatic and electrical connections
Make pneumatic and electrical connections before
adjusting the limit switch setting. See chapter 3
and 4.
10
Closed
15°
max
5.2.2 Switch point setting and valve rotation
direction.
The QC44 is equipped with non-intrusive switch
adjustment. The adjustment screws are accessible
behind a small shield in the front of the module
(see fig 5.3).
This means that the switch adjustment can be done
without opening the module.
Normally valves are "Closed" after a clock wise
rotation.
- In this case the top adjustment screw (see
fig. 5.3), sets the switch point of the "Closed"
position and bottom adjustment screw sets the
switch point of the "Open" position.
- When you have a valve that is "Open" after a
clock wise rotation, the position feedback will be
reversed.
The table below indicates which re-adjustment
screw and terminals are related to the "Open" or
"Closed" switch point setting (see fig 16).
Table 5.1 Re-adjustment screws
Re-
adjust- "Close" after
Terminals
ment
a clock wise
screw :
Bottom 1, 2, & 3 Open position Close position
Top 4, 5, & 6 Close position Open position
Installation Guide
DOC.IG.BQC44.1 Rev. 1
Valve movement
"Open" after
a clock wise
rotation rotation