AEC Self Cleaning Continuous Filters - Manual (Page 14)

Self Cleaning Continuous Filter Chapter 2: Functional Description 13
Fail Safe Operation
If a safety device or circuit should fail, the design must be such that the failure causes a
“Safe” condition. As an example, a safety switch must be a normally open switch. The switch
must be held closed with the device it is to protect. If the switch fails, it will go to the open
condition, tripping out the safety circuit.
At no time should the safety device fail and allow the operation to continue. For
example, if a safety switch is guarding a motor, and the safety switch fails, the motor should
not be able to run.
Safety Device Lock-Outs
Some safety devices disconnect electrical energy from a circuit. The safety devices that are
used on these Self Cleaning Continuous Filters are primarily concerned with electrical power
disconnection and the disabling of moving parts that may need to be accessed during the
normal operation of the machine.
Some of the safety devices utilize a manual activator. This is the method of initiating the
safety lock out. This may be in the form of a plug, lever or a handle. Within this lockable
handle, there may be a location for a padlock. Personnel servicing the equipment should
place a padlock in the lockout handle.
In addition to the safety devices listed above, these Self Cleaning Continuous Filters are
equipped with a line cord plug. This allows the operator or maintenance personnel to unplug
the Self Cleaning Continuous Filter from its power source and tag it out. The plug can then
be tagged with any number of approved electrical lockout tags available at most electrical
supply stores.
WARNING! Always disconnect and lockout all electrical power and pneumatic (i.e. compressed air)
sources prior to servicing or cleaning the Self Cleaning Continuous Filter. Failure to do
so may result in serious injury. No one but the person who installed the lockout may
remove it.