Banner MM-TA-12B Instruction Manual page 27

MM-TA-12B Muting Module
Instruction Manual
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Positive-Opening Safety Interlocking Switches
Safety interlock switches used with the MM-TA-12B Muting Module must satisfy
several requirements. Each switch must provide electrically isolated contacts: at
minimum, two normally closed (NC) contacts from two individually mounted
switches.
The contacts must be of "positive-opening" design, with one or more normally
closed contacts rated for safety. Positive-opening operation causes the switch to
be forced open, without the use of springs, when the switch actuator is disen-
gaged or moved from its home position (see the Banner Safety Catalog for exam-
ples). In addition, the switches must be mounted in a "positive mode," to
move/disengage the actuator from its home position and open the normally
closed contact, when the guard opens.
USSI
1
(Interlocked Gate
4
Switch Hookup)
Figure 3-13. USSI monitoring two positive-opening safety interlocking switches
Brown
White
USSI
1 2
(Interlocked Gate 5
Blue
4 3
Switch Hookup)
Black
WARNING . . .
When monitoring multiple guards with a series connection of multiple safety
interlock switches, a single failure may be masked or not detected at all.
When such a configuration is used, procedures must be performed regularly to
verify proper operation of each switch. See "Monitoring Series-Connected Safety
Switches" (page 28) for more information. Failure to do so could result in seri-
ous injury or death.
Figure 3-14. USSI monitoring positive-opening safety interlocking switches on
multiple gates
System Installation
Brown
White
2
5
Blue
3
Black
GATE
May not be a Safety Category 4 or Control
Reliable Application
GATE
GATE GATE