Calculation of the safety distance for an item of ESPE that is connect-
ed to the MSC system
All electro-sensitive protective equipment (ESPE) that is connected to the MSC system
must be arranged at a distance that is at least the minimum safety distance S such that
the hazardous point can only be reached after the machine's hazardous movement has
stopped.
The European standard:
- ISO 13855:2010 (EN 999:2008) Safety of machinery – Positioning of safeguards with
respect to the approach speeds of parts of the human body
contains formulas for the calculation of the correct safety distance.
Specific information in relation to the correct arrangement can be found in the instal-
lation instructions for each safety device.
It is to be noted that the total reaction time is dependent on:
the reaction time of MSC + the reaction time of ESPE + the reaction time of machine
(i.e. the time the machine requires to stop the hazardous movement from when the
stop signal is sent).
Electrical connections
The modules of the MSC system are equipped with
terminal blocks for the electrical connections. Each
module can have 8, 16 or 24 terminals.
Each module also has an MSCB plug connector on the
rear (for the communication with the base unit and
the other expansion modules).
Tightening torque for terminals: 0.6–0.7 Nm
Install safety modules in a housing that meets degree of protection IP54 as a minimum.
Connect module in electrically isolated state.
The power supply for the modules must be 24 VDC 20 % (PELV, as per EN 60204-1
(chapter 6.4)).
MSC is not allowed to be used to supply external devices.
The same ground connection (0 VDC) is to be used for all system components.
A procedure is described that permits system planners to determine the minimum safety distance between protective
equipment, in particular ESPE (e.g. light curtains), safety mats or pressure-sensitive floors and two-hand controls, and a
specific hazardous point. It contains a rule for the arrangement of protective equipment based on the approach speed and
time taken by the machine to stop, where corresponding extrapolation is possible, such that also interlocking devices with-
out guard locking are also included.
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