BS/EN 12042-2014 pdf download.Food processing machinery- Automatic dough dividers Safety and hygiene reguirements.
5.2.5 Zone 4: Drive mechanisms and other moving internal components
Access to the drive mechanism and other moving internal components including the dividing mechanisms. and the moulding/rounding device if relevant, from other sides than the discharge opening of the machine shall be prevented. This may be achieved by use of fixed guards complying with EN 953:1997+A1:2009 and where guards have to be removed daily or more regularly for deaning or maintenance by movable interlocking guards.
If the stopping time of the drive mechanism or other moving internal components is more than 1 s, the movable guard shall be interlocked with guard locking.
5.2.6 Zone 5: Flour duster
If there are mechanical risks, the flour containers shall be fitted with a fixed or interlocked guard with dimensions according to EN ISO 13857:2008. Table 4, acting on the flour feed system. If the stopping time of the flour duster is more than 1 s, the movable guard shall be interlocked with guard locking.
If there are no mechanical hazards (e.g. if the feed consists of a spindle with rubber spokes or notches, or if the flour is sprinkled by a vibrating device) due to the flour feed system and if a guard is necessary to prevent dust emission (see 5.7). this guard shall automatically be closed (e.g. by gravity, etc.). In this case, an interlocked guard Is not necessary.
5.2.7 Loss of stability
5.2.7.1 Machines shall be designed to be stable and shall comply with 5.2.7.2 and 5.2.7.3 as applicable. For machines designed to be fixed to the floor, the instruction handbook shall indicate the values of torques at the fixing points.
5.2.7.2 Free standing machines without castors shall be stable when tilted 10° from the horizontal plane. in the most unfavourable direction.
5.2.7.3 Free standing machines with castors shall have a locking device for example a brake on at least
two castors (or sets of castors) and shall comply with the provisions of 5.2.7.2.
5.3 Electrical hazards
5.3.1 General
Electrical equipment, for example switches, that may be exposed to water, e.g. during cleaning, shall be protected to an appropriate lP rating according to EN 60529 and EN 60204-1 :2006
The electrical equipment shall comply with EN 60204-1:2006, with the precisions given in the following subclauses.
5.3.2 Safety requirements related to electromagnetic phenomena
The machines shall have sufficient immunity to electromagnetic disturbances to enable them to operate safely as intended and not fail to danger when exposed to the levels and types of disturbances for the Intended use of the machine (see EN 61000-6-1).
The manufacturer of the machines shall design. install and wire the equipment and sub-assemblies taking into account the recommendations of the suppliers of these sub-assemblies.
5.3.3 Protection against electric shock
The electrical equipment shall comply with EN 60204-1:2006, Clause 6.
5.3.4 Power circuits
Devices for detection and interruption of over-current have to be applied to each live conductor in compliance with EN 60204-1:2006, 7.2.3. In case of single phase machines, no such device is required for the earthed neutral conductor.
5.3.5 Protection against earth faults in control circuits
For machinery supplied from a single-phase conductor and an earthed neutral conductor the single pole
interruption shall be in the phase conductor (see EN 60204-1:2006, 9.4.3.1).
5.3.6 Motor enclosures
Where a motor has a degree of protection lower than lP23 (see EN 60529) it shall be mounted inside an enclosure (see EN 60204-1:2006. 14.2) that guarantees a minimum degree of protection of IP23 (see EN 60529).
5.4 Emergency stop
No emergency stop is required for automatic dividers but particular attention shall be given to the accessibility
of the normal OFF switch from the operator position.
5.5 Unexpected start-up
Unexpected start-up shall be prevented using the measures described in EN 1037:1995+A1:2008 and a separate means of isolation shall be provided with for each type of energy.
5.6 Noise reduction
Automatic dividers shall be so designed and constructed that risks from airborne noise emission are reduced to the lowest level by particularly applying measures at source to control noise, see for example EN ISO 11688-1. The success of the applied noise reduction measures is assessed on the basis of the actual noise emission values (see Annex A) in relation to other machines of the same family.
5.7 Protection against flour dust emission
Means shall be provided to prevent flour from spilling onto the floor, for example a collecting device for flour below the rear end of the outlet conveyor.
If a flour duster is used to sprinkle special types of dough, the following shall be provided:
— a guard according to 5.2.6:
— automatically stop of the flour duster when the machine stops;
— maximum height of 50 mm of the underside of the flour duster above the height of the largest dough
pieces as specified in the instruction handbook.
5.8 Hygiene requirements
Automatic dividers shall be designed and manufactured in accordance with EN 1672-2:2005+A1 :2009 and
Annex B.
The 3 zones mentioned in EN 1 672-2:2005+A1 :2009 are defined as follows and shown in Figure 8:
— food area:
— inside surfaces of the hopper:BS/EN 12042-2014 pdf download.