Emerson Bettis Q Series Installation Manual page 12

Bettis Q-Series
February 2017
5.3 Re-adjustment of switch points
IMPORTANT
The procedure below assumes:
- That the actuator and control modules are
according the factory settings.
If the switch setting is somehow lost or
forgotten, then consult paragraph 6.3 to
set the switch point setting back to factory
setting.
- That the actuator / valve assembly is closed
after a clock wise rotation (see chapter 5.2).
Below procedure assures that the position feedback
complies more accurately with the valve position
and will set the switch point at approximately
4° before the end of the stroke.
To set and detect the switch point, use a multi
meter, connected to the switch terminals, to
measure
a resistance change as applicable per switch type
(see applicable wiring diagram in chapter 4.2). For
the proximity switches, you can use a proximity
switch tester.
Procedure (see fig 5.3):
1. Remove cover (15) and loosen the screw (11) of
the shield (12) and turn the shield down.
Closed Position:
2. Move the actuator/valve assembly to the closed
position by removing the control signal from
pilot valve terminal 8 and 9 (see § 4.1).
3. Turn top screw (10) counter clock wise (do not
force the adjustment screw) until the switch
trips to the "off state" (no signal).
4. Turn top screw (10) clock wise (do not force the
adjustment screw) until the switch trips to the
"on state". This position represents the actual,
mechanical "closed" position of the valve.
5. Turn the screw minimal a 1/2 turn clock wise.
The "closed" position switch point is now set.
Open Position:
6. Move the actuator to the open position by
applying the applicable voltage to pilot valve
terminal 8 and 9 (see § 4.1).
12
7. Turn bottom screw (9) clock wise (do not force
the adjustment screw) until the switch trips to
the "off state" (no signal).
8. Turn bottom screw (9) counter clock wise (do
not force the adjustment screw) until the
switch trips to the "on state". This position rep-
resents the actual "open" position of the valve.
9. Turn the screw minimal a 1/2 turn counter clock
wise. The "open" position switch point is now
set.
10. Turn the shield (12) back over the adjustment
screws and fasten it with the screw (11) and
mount the main round cover back in place.
Table 5.2 Tool table
Shield screw Cross slotted Phillips nr. PH2
0.6 x 3.5 or
Adjustment screws
Cross slotted Phillips nr. PH2
15
10
9
11
12
"Closed"
Switch point adjustment
"Open"
Switch point adjustment
Note:
360° rotation of adjustment screw is
±8° adjustment of switch point.
Fig. 5.3 Re-adjustment screws for "Open" and
"Closed" position feedback
Installation Guide
DOC.IG.BQC44.1 Rev. 1