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SAFETY
Safety handbook page - 39 -
PNSPO
The muting function is possible for both type 2 and type 4 ESPE.
The essential requirements for a particular application are described in type C norms.
For example the essential requirements for palletiser are listed below, basing on the
EN415-4:
- Muting shall only occur during a
limited time
when the access to the dangerous
zone is obstructed by the pallet.
- Muting should be completely automatic, in other words shall not depend from a
manual operation of the operator.
- Mute initiation shall not be activated on a single electrical signal. At least
two
different signals are necessary.
-
Mute initiation shall not rely entirely on software signals. Is possible to use a
software signal in combination with hardware signal.
-
Mute signals shall allow a muted condition only if a correct sequence is respected,
otherwise an incorrect sequence causes the machine to stop.
- The safety function of the light barrier shall be re-established immediately after the
passage of the recognized pallet.
- In case of some material is blocked inside the detection area (for example some
box fallen down from a pallet), the muting will be disabled and the machine shall
stop. A manual action it is required for removing the box from the area. Restart of
the machine shall only be possible by voluntary action.
This function is called override.
Next figure illustrate a typical installation of the mute sensors, the mute control device,
the indicator and the command pushbuttons.
Wiring of a muting system
Four external 'mute sensors' provide inputs to the 'mute control relay'. Only a specific
sequential activation of the mute sensors will allow operation of the 'mute sequence'.
In this case, when the first two sensors are activated in sequence, the mute state starts
indicated by the yellow mute blinking lamp. The pallet goes through each sensor and
through the light curtain in one direction. The mute function will remain until the first of
the last two mute sensors are de-activated. The light curtain is then re-enabled.