Refurbished cells offer improved safety
A
Jokab Safety UK product story
Edited by the Engineeringtalk editorial team
Apr 16, 2008
Syscom UK decided to use the Vital Solution from Jokab Safety as it met the Category 4 requirements and provided the ability to connect all the devices to one safety monitoring unit.
In 2003 GPS acquired two manufacturing cells that needed to be refurbished and brought up to the current safety requirements.
Syscom UK was brought in to evaluate the machine guarding and where it was needed, to increase the safety integrity.
When designing and building machinery, one has to consider the risk factor when operators are working with the machine.
This is initially started by creating a risk assessment.
The risk assessment allows the manufacturer of the machine to consider all the possible risks and dangerous areas in the machine.
Once these have been identified, the machine builder then can develop the safety system to meet the requirements put down in the standards.
There are four categories which are used to identify the reliability of the safety system.
These are called simply 1, 2, 3 and 4, depending of the type of injury, exposure to the hazard and the possibility of avoiding the hazard.
One can use these parameters to work out which category level the machine needs to comply to.
Category 4 is seen to be at the highest level one can adapt to for machine safety.
Recently there have been changes to the standards the way components and systems are created.
The new SIL levels, means that GPS has to consider the level of reliability, predictability and traceability of all components used within the safety system which is related to the failure time consequence.
At GPS UK the cells had a variety of possible dangers from Category 2 to 4.
It was decided that the manufacturing cells needed to be brought up to Category 4, SIL3 as it was simpler to keep the safety levels the same to prevent any unnecessary complex interlocking within the safety system.
The cells consisted of a gantry robot and an injection moulding machine together with other automated processes.
The focus was to prevent operators accessing the manufacturing cell during production and to allow a full integration of all the safety devices from different areas of the cell.
Syscom UK decided to use the Vital Solution from Jokab Safety as it met the Category 4 requirements and provided the ability to connect all the devices to one safety monitoring unit.
The safety system consisted of emergency stop buttons and Jokab's JSNY9 door interlock switches.
These devices have Tina 3A interfaces, which monitor the two normally closed contacts and change the signal to the Vital unit if the safety devices are operated.
A Spot 10 safety light beam was also used in the safety circuit to monitor the gantry robot position.
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