Instruction Manual

page 7
Safety Extension Module – Model EM-F-7G
Periodic Checkout
The checkout procedure described on page 6 should be performed according to the
intervals specified by the product documentation of the Primary Safety Device
controlling this Safety Extension Module.
Repairs
Do not attempt any repairs to the EM-F-7G Safety Extension Module. It contains no
field-replaceable components. Return the Safety Extension Module to the factory for
warranty repair or replacement.
If it ever becomes necessary to return a Safety Extension Module to the factory,
please do the following:
1) Contact the Banner Factory Application Engineering Group at the addresses or at
the numbers listed at the bottom of page 8. They will attempt to troubleshoot the
system from your description of the problem. If they conclude that a component
is defective, they will issue an RMA (Return Merchandise Authorization) number
for your paperwork, and give you the proper shipping address.
2) Pack the Safety Extension Module carefully. Damage which occurs in return
shipping is not covered by warranty.
WARNING . . .
MSC Monitoring
All Master Stop Control elements (MSCs), such as control relays, must be of forced-guided, captive contact design to
allow the MSC Monitoring circuit to detect unsafe failures within the master stop control elements. This monitoring
extends the safe switching point of the Primary Safety Device and the EM-F-7G Safety Extension Module to the MSC
elements. For this monitoring to be effective, a minimum of two redundant MSCs are required to control each hazard. This is to detect
the unsafe failure of one MSC (e.g., a welded contact), while stopping the hazard and preventing a successive machine cycle with the
second MSC.
If the MSCs are the last electrically controlled device generating the hazard (i.e., not relays or contactors) and they do not have
forced-guided, captive contacts to monitor (such as a solenoid), then the user must ensure that failure or fault of any single
component of the MSCs will prevent a successive machine cycle and will not result in a hazardous situation.
NOTE: MSC monitoring is also called external device monitoring (EDM), MPCEfeedback, and relay backchecking.
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