Automation Canada Machine Safety Issue - 7

A CLOSER LOOK AT SAFETY VALVES AND THE
VALUE OF PERFORMANCE LEVEL E CNT'D.

With a general understanding of how to determine what performance
level of safety component you need we can look more closely at your
options Here we focus on the Festo MS series safety valves. A safety
valve is used as an output device on a safety system that is designed to
reliably reduce pressure quickly and then build it back up slowly.
Typically, it is triggered by a safety device like a light curtain or e-stop.
Most safety valves require a dual channel signal, often one high one
low, but they can be both high and both low. These devices are
designed to ensure safe operation. These type safety valves always
incorporate sensors to monitor the position of the spools. Those signals
are then sent back to the monitoring device.
Typically, level D requires a smart controller that is sending signals to
the device saying you need to turn off now, and did you? And then
feedback is returned. Or it asks if the machine turned on and returns that
feedback, but it requires an intelligent programmable safety relay or
C A N A D I A N A U TO M AT I O N

PLC and that logic is running the valve.
However, Performance Level E is a more self-contained and intelligent
safety valve. It incorporates the engagement of the soft start functions
via the soft start piston which is monitored by a third sensor. This valve
has integrated electronics and self-testing diagnostics, status indication
LED's for power and error indication at the top of the unit, and all
feedback sensors are fully integrated. All in all, Performance Level E
offers an advancement in not just safety but intelligent monitoring and
feedback that can perform without the use of external logic control.
Although it sees like an in depth and engaged process ensuring both
equipment and safety for those working around machines is essential.
Undertaking a risk assessment and ensuring you have a Performance
level that meets or exceeds your requirements is critical to operating a
safe machine and voiding injuries or costly damage.

VOLUME 2, ISSUE 6

7
https://www.festo.com/cms/en-ca_ca/54375.htm
Automation Canada Machine Safety Issue

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