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Periodic Checkout Procedures
3) Verify that
• Access to any dangerous parts of the guarded machine is not possible
from any direction not protected by the safeguarding system, hard guard-
ing, or supplemental safeguarding, and that
• Supplemental safeguarding and hard guarding, as described by the appro-
priate safety standards, are in place and functioning properly.
4) Verify that the Reset switch is mounted outside the guarded area, out of
reach of anyone inside the guarded area, and that means of preventing inad-
vertent use is in place.
5) Examine the electrical wiring connections between the Module's OSSD out-
puts and the guarded machine's control elements to verify that the wiring
meets the requirements stated in Section 3.7.
6) Apply power to the Module. Ensure that power to the guarded machine is
OFF. Verify that the external safety systems are providing a Green/Go signal
to the MSSI and USSI inputs, and that the Green channel indicators (two
pairs of LEDs located near each connector) are ON. When configured for
Manual Reset, the Yellow status indicator will be flashing. Perform a manual
reset (close the Reset switch for 1/4 to 2 seconds, then open the switch).
Verify that the Green status indicator is ON steady.
NOTE: A Red flashing status indicator signifies a lockout condition. Refer to
Section 5 for information.
7) In a non-muted condition, generate a stop command from the safeguarding
device connected to the MSSI (e.g. interrupt the defined area of a safety light
screen). Verify that MSSI Channel A and B and the Green status indicators go
OFF. In order, reset the safeguard and then the Module (in Manual Reset).
8) Generate a stop command from the safeguarding device connected to the
USSI (e.g., actuate E-stop button). Verify that USSI Channel A and B and the
Green status indicators go OFF. In order, reset the safeguard and then the MM-
TA-12B Module (in Manual Reset).
9) Apply power to the guarded machine and verify that the machine does not start
up. Generate a stop command from the safeguarding device connected to the
USSI and the MSSI in a non-muted condition. Verify that it is not possible for
the guarded machine to be put into motion while either stop commands are
present. In order, reset the safeguard and then the MM-TA-12B Module (in
Manual Reset).
10) Initiate machine motion of the guarded machine and, while it is moving, as in
step #9 above, generate a stop command from each safeguarding device. Do
not attempt to insert anything into the dangerous parts of the machine. Upon
issuing the stop command, the dangerous parts of the machine should come
to a stop with no apparent delay. Upon reset of the safeguard and the MM-TA-
12B, verify that the machine does not automatically restart, and that the initia-
tion devices must be engaged to restart the machine.
13) Remove electrical power to the MM-TA-12B Module. All OSSD outputs should
immediately turn OFF, and should not be capable of turning ON until power is
re-applied and a reset is accomplished.
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MM-TA-12B Muting Module
Instruction Manual
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