Interlocking solenoid safety switches
with metal body
SLM
Protection class IP 67
Y
System description
The safety switch SLM with lock is available
in spring and solenoid interlocking design.
The separate actuator is securely mounted
to the closing guard. When the actuator is
inserted into the switch the guard door
position is then monitored and either
locked or released (dependant on control
system/status of machine).
The separate actuator provides a very high
level of “operator interference” protection
because of its triple coding.
The locking device in the safety switch SLM
is integrated into the switch housing.
In the spring latch version locking is
achieved with a spring mechanism, in the
solenoid latch version locking is achieved
by energizing an electromagnet. Both types
link the actuator with a switch mechanism
for position indication.
Machines, which have a “run down time”
after they have been switched off, are
often part of automatic production proces-
ses.
Safety devices should prevent access by the
operator and must be kept locked until the
dangerous movement has stopped.
The safety-position switch (with suitable
control) will ensure that safety guards,
doors and other covers are kept closed as
long as there is danger.
The safety switch has three main functions:
l
Allowing the machine to operate while
the guard is closed and locked
l
Isolating the machine when the guard is
open
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Monitoring the position of the guard
and the actuator (open or closed)
With the safety switch SLM the user has a
position switch with separate actuator and
built in locking device, which meets the cri-
teria of interlocking devices, according to
EN 1088, the EN 292 part I and 2 are also
valid since 01.01.1995 complying to the
necessary machine guide-lines.
Benefits of this system
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All elements are enclosed in one metal
housing
l
High resistance to heavy industrial use
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Compact housing for space saving instal-
lation
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Triple coded actuator with high
interference protection
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Simple alteration of actuator approach
direction in 90º positions (adjust only
with actuator fitted)
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All switch functions enclosed in inner
module
l
Safe and easy wiring due to terminals in
separate connection area.
l
Individual contact configurations possible
l
Integrated safety circuit protects against
voltage peaks and incorrect termination
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Mounting with M 5 screws according to
DIN EN 50041
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Construction design according to VDE
0660 part 200 IEC 947-5-1 control
principles GS-ET 19 of the (German)
employer’s liability insurance association
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Certification: UL & CSA
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Approval: BG
Important note:
The actuator head position may only
be changed with the actuator insert-
ed.
78
Locking systems
SLM metal-bodied safety switches with
separate actuators are available with spring
locking as well as solenoid locking.
Options
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Individual contact configurations possible
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Radius actuator for actuating radius
lower than 400 mm
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Auxiliary unlock
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Key override
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Emergency stop override
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Visual indication of operating status of
the guard and lock
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Actuator for operating with head rotat-
ed 180º from standard
l
Customised solutions
Spring locking
The lock for the standard product operates
with a spring force latch. The safety device
is self-latched, when the actuator reaches
its inserted end position and the solenoid is
not energized (rest current principle). The
actuator is released only when current is
applied to the solenoid coil. The guard
door can than be opened.
Important note:
Safety switch model SLM with emer-
gency stop override must be installed
inside
the guarded (dangerous) area.
The emergency stop should only be
able to be activated to ensure escape
from a dangerous area in case of a
system error.
Solenoid locking
The SLM safety switch is also available with
solenoid powered locking. The guard is
only then locked when the actuator
reaches its inserted end position and the
solenoid is energized (conducting).
The actuator is released when power is
removed. The guard can then be opened.
79
Switches
嵌入式系统
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