Mecmesin MultiTest-d Operating Manual page 9

A Guide to Safe Use of Mains Powered Test Frames
CAUTION - It is possible that when the power fails the sample could be under compression or
tension in a force testing stand, or under torsion in the case of a Vortex stand. Care should be
exercised when attempting to release a trapped sample from the grips. It is preferable to wait
until the power is restored and then relieve the strain using the jog buttons before removing the
sample.
7. Using computer controlled or Console controlled stands with other equipment
7.1 Digital inputs and outputs
MultiTest-i and xt and Vortex-i and xt are provided with digital input and output connections
than can be used with other devices e.g. Programmable Logic Controllers (PLC). If the stand
has been connected to such an external device, it is possible for the PLC to have control over
the stand. Particular attention should be paid when configuring the 'START TEST' and 'GO
HOME' commands as these can cause the crosshead or platen to move without warning and
without any input to the computer, Console or front panel jog buttons.
7.2 Assemblies of machines and the emergency stop button
If the test stand is to be incorporated into other 'Machines' as defined by the Machinery
directive section 1.2.4.4 such as a PLC network, then it is important to note that pressing the
emergency stop button on the Mecmesin test frame will not stop any machinery except the
Mecmesin test stand, unless the controller is specifically programmed to perform such action in
this event. Any personnel configuring such a system must be deemed 'competent' to perform
such a task. It is the responsibility of the user to carry out any necessary risk assessment
associated with safety-critical operation.
8. Eye protection and protective clothing
Eye protection should always be used in the form of an approved pair of safety spectacles.
Extra bodily protection may be necessary if destructive testing or volatile failure of a test piece
is likely. Consideration needs to be given to the likely behaviour of the samples being tested
and the use of any appropriate personal protective equipment that may be needed. A risk
assessment should be carried out prior to using the test frame to ensure that all necessary safety
measures have been considered and carried out.
It is important to review the risk assessment if new tests or new samples are introduced.
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