BS/EN 454-2014 pdf download.Food processing machinery Planetary mixers – Safety and hygiene requirements.
5.2.2.3 Access to the tool
The tool drive mechanism shall not be capable of operation when the bowl is not in place and in the working position e.g. by a switch actuated by a cam located inside the frame.
5.2.2.4 Stopping time
Guard actuated stopping devices shall stop the tool without any ingredients present in the bowl in less than or equal to 4 s. If this not possible. opening of the guard shall be prevented until the tool has stopped moving. This can be achieved by providing an interlocking guard with guard locking (see EN ISO 12100:2010, 3.27.5).
5.2.3 Zone 2— AuxilIary drive hub (mechanical)
The drive shaft on which attachments are fitted shall nGt project from the machine frame arid shall be fitted
with a cover which cannot be removed from the machine. e.g. hinged, so as to enclose the connection point.
5.2.4 Zone 3— Space between bowl lifting system and frame
5.2.4.1 The guide and drive mechanism operating the vertical movement of the bowl shall not create any risks of trapping or pinching. This may be achieved by use of a fixed guard
5.2.4.2 When manually operated minimum distance between either the bowl or the frame and the lever for lifting and lowering the bowl shall be 50 mm in order to prevent injury when operating the lever.
5.2.4.3 If the bowl lifting and Lowering mechanism is motorized, crushing between the ascending bowl, bowl lifting system and machine frame and any guard shall be prevented. This may be by either:
— a pressure-sensitive edge or;
— a hold-to-run control to operate the bowl movement.
5.2.5.3 Free standing machines with castors shall have at least two castors (or sets of castors) fitted with
a locking device and shall comply with the provisions of 5.2.5.2.
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 IP-rating according to EN 60529 and EN 60204-1.
The electrical equipment shall comply with EN 60204-1, with the following requirements given in 5.3.2, 5.3.3, 5.3.4 and 5.3.5.
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 shall 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).
5.4 Motor enclosures
Where a motor has a degree of protection lower than lP23 it shall be mounted inside an enclosure (see EN 60204-1:2006. 14.2) that guarantees a minimum degree of protection of IP23.
5.5 Emergency stop
No emergency stop is required for planetary mixers but particular attention shall be given to the accessibility of
the normal OFF-switch from the operator position.
5.6 Thermal hazards
On machines equipped with a device to maintain food at a constant temperature during processing bowl handles and grips shall be designed in such a way as to avoid burns according to EN ISO 13732-1.
5.7 Gas accumulation hazard
Open flame heating devices may be allowed. Means shall be provided to prevent escape of unbumt gas. e.g.
a flame protection system. For requirements on gas burner control systems see EN 298.
5.8 Noise reduction
Planetary mixers shall be so designed and constructed that risks from airborne noise emission are reduced to the lowest level, as far as it can be reduced taking account of technical progress, by particularly applying measures at source to control noise (for example, see 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.
5.9 Flour dust hazard
Flour dust emissions from Class 2 planetary mixers working with flour shall be minimized using a solid interlocked guard (e.g. a cover without apertures). Where the manufacturer uses some other method to limit flour dust emissions it shall be at least as effective as a solid interlocked guard.
NOTE This standard does not deal with automatic feeding.
If the machine is intended for use with automatic feeding of dry ingredients, the manufacturer shall design measures to prevent flour dust emission during feeding without decreasing the level of safety.
A method for measuring flour dust is given for information In Annex B.
5.10 Hygiene requirements
Planetary mixers shall be designed and manufactured in accordance with EN 1672-2 and Annex C.
The 3 zones shown in Figure 7 are defined In EN 1672-2 and are in general at least as follows:BS/EN 454-2014 pdf download.