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Installation Guide
Bettis Q-Series
DOC.IG.BQC44.1 Rev. 1
February 2017
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5.2.3 Working principles Switch Operating
Mechanism (see fig 5.2)
The Switch Operating Mechanism is intend to
operate the position feedback switches and allows
adjustment of the switch points in the open and
closed end positions. Factory setting is that the
switches are activated 15° before the end of the
open and closed stroke.
Switch Operation
The rotation of the actuators pinion operates the
IPT device (1) which results in a linear movement.
The linear movement of the IPT device operates
lever (3). The lever amplifies the linear movement
of the IPT device and operates the switch operating
rod (5). Dowel pin (6) in the rod operated the levers
of the open and closed switch elements (8 & 9).
The lever is of the “floating” type. When the IPT
device operates the lever, it moves completely
upwards until it meets the upper pivot block (4). At
this point the lever will tip over and pull down the
switch operating rod (5) and operates the
bottom switch (7). When the IPT device moves back
the springs cause the lever to move completely
downwards until it meets the lower pivot block
(2). At this point the lever will tip over and push up
the switch operating rod (5) and operates the top
switch (8).
Fig. 5.2 Working principles Switch Operating Mechanism
Switch point adjustment
The position of the lower pivot block (2) can be
changed by adjustment screw (10) and the position
of the upper pivot block (4) can be changed by
adjustment screw (9).
By adjusting the position of these pivot blocks the
switch points will be changed.
The adjustment screws (9 & 10) can be found
behind the shield (12) in front of the module. To
access the adjustment screws loosen the screw (11)
and rotate the shield (12) as shown.
Caution: Do not force the
adjustment screws when
resistance is felt.
During adjustment there are three situations
that can damage the adjustment screw head and
internal mechanisms when forcing the adjustment
screws.
1. Pivot block (2) will be blocked at bottom if screw
(10) is rotated too much counter clock wise.
2. Pivot block (3) will be blocked at top if screw (9)
is rotated too much clock wise.
3. Pivot blocks (2&3) will interfere with each other,
if the adjustment screws (9&10) are rotated too
much in the direction according to their related
arrows.
Situation 1 and 2 may happen in combination with
situation 3.
