2
SIRIUS
Position Switches with Separate Actuator
3SE7120-
3SE7140-
3SE7150-
Operating Instructions
Order No.: 3ZX1012-0SE70-2AA1
English
Read and understand these instructions before installing, operating, or
maintaining the equipment.
Reliable functioning of the equipment is only ensured with certified
components.
The products described herein are designed to be components of a
customized machinery safety-oriented control system. A complete
safety-oriented system may include safety sensors, evaluators, actua-
tors and signaling components. It is the responsibility of each company
to conduct its own evaluation of the effectiveness of the safety system
by trained individuals. Siemens AG, its subsidiaries and affiliates (col-
lectively "Siemens") are not in a position to evaluate all of the charac-
teristics of a given machine or product not designed by Siemens.
Siemens accepts no liability for any recommendation that may be
implied or stated herein. The warranty contained in the contract of sale
by Siemens is the sole warranty of Siemens. Any statements contained
herein do not create new warranties or modify existing ones.
When the wire cable is pre-stressed, the contacts 21-22 are closed and
the contacts 13-14 are open. When the wire cable is being pulled or if it
breaks, the contacts 21-22 are opened and the contacts 13-14 are
closed. In the case of cable-operated switches with latching, the con-
tacts 21-22 are latched open and the contacts 13-14 are latched closed
when the wire cable is being pulled or if it breaks. The contacts can be
unlatched by either pushing the pushbutton or using the key.
It is only possible to unlatch the contacts in the middle position
(pre-stressed position.
When installing, the switch must be pre-stressed until the switch cam is
in the middle position.
The cable-operated switch must be installed so that safe manual
unlatching is possible.
Before installing the sheathed cable, the sheath must be removed from
the wire cable in the vicinity of the clamps. The wire cable must be
installed according to the installtion instructions.
As the grommet thimble deforms when the wire cable is being pulled,
the wire cable should be vigorously pulled several times after
installation. The tension of the wire cable must be subsequently
regulated by means of either a cable clamp or via the eyebolt or tension
jack.
Due to the tendency of the wire cable to expand when exposed to heat,
the ambient temperature range decreases with increasis cable length.
The switch may only be operated by pulling the sheathed cable and
never by removing the mechanism or the drawgear using tools.
The operator must convince himself/herself regularly of the safe func-
tioning of the EMRGENCY STOP device.
Installation notes
(see Fig. 3A and 3B)
A
Recommended cable lengths
S
(m)
for safety cable-operated switches
dependent upon ambient temperature range
T
(°C).
B
Attention: Cable supports spaced as follows are required:
3SE7150- all 3 m
3SE7140- all 5 m
3SE7120- all 2,5 m
DANGER
Hazardous voltage.
Will cause death or serious injury.
Disconnect power before working on equipment.
Important notice
Design / Operating principle
Installation
!
Note
Technical data
Standards applied
IEC 947-5-5/EN 60947-5-5
Enclosure
GD-AL alloy, painted
Cover
Impact-resistant thermoplast
Degree of protection
IP65 acc. to IEC 529 / EN 60 529
Switching system
A
acc. to IEC 947-5-5
1 NC contact and 1 NO contact, snap
contact
Positively-driven NC contacts
Connection type
M3.5 scew-type connection;
self-lifting U-bolt
Cable entry
3SE7 140-...00 = 1 x M16x1,5
3SE7 150-...00 = 2 x M20x1,5
3SE7 140-...0 AS = 2 x M25x1,5
3SE7 120-... = 2 x M20x1,5
Cable length
3SE7 140-... max. 50 m
3SE7 150-... max. 25 m
3SE7 120-... max. 10 m
(observe ambient temperature)
Spring resistances
3SE7150- 200N
3SE7120- 55N
Mech. service life
> 10
6
switching cycles
Permiss. operating temperature –25°C up to +70°C
(observe cable length)
Permiss. electr. load
400 V AC / 6 A (AC-15)
Short-circuit strength
6 A (time-lag)
Indicator lamp
Indicator lamp not connectedn
Degree of protection
IP65
Permiss. electr. load
24 V =, < 45 mA, red
