IEC 60204-34:2016 pdf download.Safety of machinery - Electrical equipment of machines
4.4.7 lonizing and non-ionizing radiation
Adition:Laser processing machines can generate laser radiation. Laser class according to IEC 60825-1 shall be stated and laser hazard label which correspond to the laser class need to be affixed, and laser hazards shall be minimised according to IEC 60825-1 and IEC 60825-4. IEC 60825-4 specifies requirements for laser guards.
NOTE Further requirements on industrial laser equipment can be found in IEC 60519- 12. Further information can be found in ISO 11553-1.
5 Incoming supply conductor terminations and devices for disconnecting and switching off This clause of IEC 60204-1 is applicable except as follows:
5.1 Incoming supply conductor terminations
Addition:
Add after the first sentence of the first paragraph:
When a machine tool needs to use several electrical cabinets, it is recommended that the main power supply is connected to the main power switch of one single electrical cabinet. If other cabinets need a power supply, it is recommended that they connect to the main power switch of this one single electrical cabinet.
9.2.3.5 Operating modes
Addition: Add after the final paragraph:
Numerical control machine tools usually have many operating modes, for example manual mode,automatic mode, setting mode, service mode, etc.
Mode selector shall ensure that only one mode is active at anytime. The parts of the control system provided for mode selector shall be assigned to a suitable PL of ISO 13849-1 or SIL of IEC 62061. Required PL or SIL should be selected by risk assessment or in accordance with
relevant type-C standards, e.g. ISO 23125.
9.3 Protective interlocks
Addition:
Add a new subclause:
9.3.7 Interlocking guards with guard locking
If hazardous situations still exist after removal of power, an interlocking guard with guard locking (see also ISO 14119) shall be provided, fulilling a suitable PL of ISO 13849-1 or SIL of IEC 62061. Required PL or SIL should be selected by risk assessment or in accordance with
relevant type-C standards, e.g. ISo 23125.
9.4.4 Levels of functional safety
Functional safety is part of the overall safety that depends on a system or equipment operating correctly in response to its inputs.
For the purposes of ISO 13849, the ability of safety-related parts to perform a safety function is expressed through the determination of the performance level (PL).
According to IEC 62061 and IEC 61508, the ability of safety-related control systems to perform a safety function is given through a SIL. Table 2 displays the relationship between the two concepts (PLs and SILs). See Annex A of ISO 13849-1 :2006 for determination of required performance level (PLs); a SIL example of a methodology is given in Annex A of IEC 62061 :2005, IEC 62061 :2005/AMD1:2012 and IEC 62061:2005/AMD2:2015.IEC 60204-34 pdf download.