Description
The rotary limit switch is used
to control the movement of industrial
machinery. It operates as an
auxiliary controller of electrical
motors through a power interface,
such as a contactor or PLC.
Suitable for heavy duty, its
shaft is connected to the motor
and, after a set number of revolutions,
the cams operate the switches,
thus starting the predetermined
movement. A worm gear and a
helical toothed gear combined
with one or more pairs of straight
toothed gears are used for the
transmission of the movement
from the input shaft to the
output shaft.
Revolution ratios, ranging
from 1:1 to 1:969, result from
the use of different combinations
of gear wheels between the input
shaft and the output shaft,
which is connected to the cams
operating the switches.
Transmission and gear driving
shafts are made of stainless
steel to prevent oxidation and
wear. The gear wheels and the
driving bushes are made of self-lubricating
thermoplastic material, suitably
chosen to reduce the wear to
a minimum and to maintain the
accuracy of the couplings over
time. Sintered bronze bushes
are moulded into the base of
the limit switch to optimise
the shaft rotation and to prevent
rubbing with plastic material.
Each cam can be set with great
accuracy thanks to the cam adjusting
screws. The auxiliary switches
are of a positive opening type,
thus suitable for safety functions.
It is available with direct
control switches for operating
directly on the motor.
The cam-switch sets can be substituted
for potentiometers suitable
for the connection to electronic
equipment. Each output of the
limit switch can be set with
a different revolution ratio
to allow for a diversified control
of the machinery to meet special
requirements.
Materials
and components are wear resistant
and protect the equipment against
water and dust. The limit switch
is available with a flange for
direct coupling to the motor
and it can be customised with
labels and colours according
to the customer’s requirements.
Specification •
The limit switch can
be customised •
Switches available: 1NC
and 1NC+1NO, with positive mechanical
contact opening, snap action •
Available with front
fixing flange •
Available with the same
or different revolution ration
on the two motion entries
Technical
Detail •
Operational temperature
-25°C / +70°C •
Degree of protection
IP 65 •
Insulation category Class
II •
Rated operational current
3 A •
Rated operational voltage
250V •
Mechanical life 1x106
operations •
Enclosure CE Switches
(UL, cUL on request)
