STAND ALONE PROGRAMMABLE SAFETY CONTROLLER
8541403 • 19/07/2021 • Rev.1 9
INSTALLATION
Mechanical fastening
Fix the MZERO system unit to a 35mm DIN rail as follows:
1. Fasten the controller to the rail. Press the unit gently until you feel it snap into
place.
2. To remove the unit, use a screwdriver to pull down the locking latch on the back of
the unit; then lift the unit upwards and pull.
Figure 1
Calculation of safety distance of an ESPE connected to MZERO
Any Electro-sensitive Protective Equipment device connected to MZERO, must be positioned at a
distance equal to or greater than the minimum safety distance S so that the dangerous point can
be reached only after stopping the dangerous movement of the machine.
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.”
provides the elements to calculate the proper safety distance.
Carefully read the installation manual of each device for specific information on the correct
positioning.
Remember that the total response time depends on:
MZERO response time + ESPE response time + response time of the machine (i.e. the time
taken by the machine to stop the dangerous movement from the moment in which the stop
signal is transmitted).
"Describe the methods that designers can use to calculate the minimum safety distance from a specific dangerous point for the safety
devices, particularly Electro-sensitive devices (eg. light curtains), safety-mats or pressure sensitive floors and bimanual control. It
contains a rule to determine the placement of safety devices based on approach speed and the stopping time of the machine, which
can reasonably be extrapolated so that it also includes the interlocking guards without guard locking."
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