Where powered workpiece clamping is provided, crushing
shall be prevented by:
a) two stage clamping with a maximum clamping force at
the clamping device of 50 N for the first stage, followed
by full clamping force actuated by a manual control, or
b) reduction of the clamp/workpiece gap to 6 mm by a
manually adjustable device, and stroke limitation to a
maximum of 10 mm, or
c) limitation of the clamp closing speed to 10 mm s
-1
or
less, or
d) guarding of the clamp by a guard fixed to the clamping
device to reduce the gap between the workpiece and
the guard to less than 6 mm. The maximum extension
of the clamp outside the guard shall be not more than 6
mm.
The full clamping force of each clamping unit shall be at
least 700 N over the whole range of adjustment of the
clamping device.
The safety related part of the control systems for
supervision of the first stage clamping force (see 5.3.8 a))
and the limitation of the clamp closing speed (see 5.3.8
c)) shall be at least PL=c in accordance with the
requirements of EN ISO 13849-1:2008 (see 5.2.1).
Where pneumatic or hydraulic clamping is provided the
requirements of EN ISO 4413:2010 or EN ISO 4414:2010
respectively shall be met.
On machines with pneumatic clamping of the workpiece,
provision shall be made to maintain clamping pressure in
the event of pneumatic power failure. Where non-return
valves are used to meet this requirement, they shall be
fitted to the actuating cylinders in accordance with EN ISO
4414:2010.
Verification: By checking the relevant drawings and/or
circuit diagrams, inspection of the machine, measurement
and relevant functional testing of the machine.
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