Samson 4747, Mounting And Operating Instructions

Page: 13 / 64

EB 4747 EN 13
Design and principle of operation
3 Design and principle of oper -
ation
The limit switch is equipped with a maximum
of two inductive proximity switches or two
electric microswitches.
For most applications the contacts are ad-
justed to issue a signal when the actuator
has reached one of its end positions. The
switching point can be adjusted to any posi-
tion within the opening angle or travel range
to signalize intermediate positions.
The shaft (4) of the limit switch is connected
to the actuator by a follower pin. The shaft
has a maximum of two metal tags or cam
disks (3).
3.1 Type 4747-xxx01 Inductive
Limit Switch
A NAMUR signal is required to control the
inductive contacts (see section 6.6).
The limit switch has adjustable metal tags (3)
on the shaft (4). When the tag (3) is inside
the magnetic field of the NAMUR proximity
switch, the proximity switch is attenuated
and the output has a high impedance
(switching function “Contact open”). When
the tag (3) leaves the magnetic field, the
NAMUR proximity switch is unattenuated
and the output has a low impedance (switch-
ing function "Contact closed"). The tag (3)
can be adjusted to a switching point be-
tween 0 and 100° at the adjustment screw
(2).
3.2 Type 4747-xxx1x Electric
Limit Switch
The limit switch has a maximum of two ad -
justable metal cam disks (3) on the shaft (1).
The cam disk (3) activates the electric mi-
croswitch over the roller on the switch lever.
The cam disks (3) can be adjusted to a
switching point between 0 and 100° at the
adjustment screws (2).
Note