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MM-TA-12B Muting Module
Instruction Manual
WARNING . . .
Emergency Stop
Switch Wiring
Whenever two or more Emergency
Stop switches are connected to the
same Module:
• Contacts of the corresponding
pole of each switch must be con-
nected together in series. Never
connect the contacts of multiple
Emergency Stop switches in par-
allel to one Module. Such a par-
allel connection connection
defeats the switch contact moni-
toring ability of the Module and
creates an unsafe condition
which could result in serious
injury or death.
• Each switch must be individually
actuated (engaged), then re-
armed and the Module reset.
This allows the controller to
check each switch and its wiring
to detect faults. Failure to test
each switch individually in this
manner could result in undetect-
ed faults and create an unsafe
condition which could result in
serious injury or death. This
check must be performed during
periodic checkouts (see Section
6).
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3.5.5.1 USSI Emergency Stop Switch Hookup
As shown in Figure 3-12, the E-stop switch must provide two contacts which are
closed when the switch is armed. Once activated, the E-stop switch must open all
its contacts, and must be returned to the closed contact position only by means
of a deliberate action (such as twisting, pulling, or unlocking). The switch should
be a "positive-opening" type, as described by IEC947-5-1. A mechanical force
applied to such a button (or switch) is transmitted directly to the contacts, forc-
ing them open. This ensures that the switch contacts will open whenever the
switch is activated. NFPA 79 section 13.2, Emergency Stop Devices, specifies the
following additional switch ("stop control") requirements:
• Emergency Stop push buttons shall be located at each operator control station
and at other operating stations where emergency shutdown shall be required.
• Stop and Emergency Stop push buttons shall be continuously operable from all
control and operating stations where located. Do not connect E-stop buttons to
the MSSI.
• Actuators of Emergency Stop devices shall be colored Red. The background
immediately around the device actuator shall be colored Yellow. The actuator of
a push-button-operated device shall be of the palm or mushroom-head type.
• The Emergency Stop actuator shall be a self-latching type.
NOTE: Some applications may have additional requirements. The user must refer
to all relevant regulations.
Brown
White
USSI
1
2
(Emergency Stop
5
Blue
Switch Hookup)
4
3
Black
See Warning at left concerning multiple E-stop switches
Figure 3-12. Emergency Stop switch hookup
System Installation
E-Stop
E-Stop
E-Stop
E-Stop
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