Mechanical units can be integrated wireless
in the machine and plant concept and provide for a low-cost
safeguarding of vast areas.
With the modular, mechanical trapped key interlock
system wireless safety concepts may be realized. It is a proven
system solution to protect hazardous machines and systems
wireless and cost-effectively. Even category 4 / PL e / SIL
3 will be achieved with a correct structure of the system.
Thanks to the stable housing made of stainless steel and the
special robust construction the system is absolutely resistant
even under extreme conditions. The safety concept adapts
to the customer-specific requirements taking into account
the respective operating procedures and not vice versa.
Therefore it can also be used in different ambient conditions
for almost all separating safeguards of secured applications.
The system works with safety keys serving to unblock or lock
functions. If for example a machine is pending for maintenance,
the safety key will be removed which triggers a signal (standstill,
safe condition). A start of the system will not possible as
long as the key is missing. With the released key the maintenance
door can be safely unlocked.
The basic principle of the key transfer system ensures that
the machine is in a safe condition before an access shall
be entered. A further safety-related aspect is that a key
can either inserted in the safety switch or used for opening
of a door locking. By means of these characteristics a certain
order of operations can be forced which cannot be deviated
from. Thereby a high level will be reached and in this way
a variety of different danger zones can be secured. Especially
for extreme and harsh ambient conditions (dust, moisture,
dirt, extreme temperatures, vibrations etc.) as well as for
extensive installations a mechanical, wireless safeguarding
is suitable, as electrical units are inappropriate here or
not economical to install.
All modules as well as accessories can be coded individually,
therefore the safety level will be increased as well as an
additional protection against unauthorized access will be
However, the SAFEMASTER STS System offers much more than
only the possibility to combine safety switches and key transfer
systems. It combines the advantages of both systems connecting
wireless, mechanical safeguarding with electrical protection.
Thereby it is highly flexible and is optimally adapted to
the requirements of the user.
Further information about the individual modules can be found
on the corresponding data sheets. Please feel free to us the
experts of company Dold for the selection of the correct functionality.
units design 2
actuator can be removed after the key has been inserted