Banner MMD-TA-11B Muting Modules - Manual (Page 29)

P/N 116390 rev. C
27
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
MMD-TA-11B / MMD-TA-12B Muting Module
Instruction Manual
System Installation
The systems in either scenario do not inherently comply with
the safety standard requirements of detecting single faults
and preventing the next cycle. In multiple-guard systems
using series-connected safety switches, it is important to
periodically check the functional integrity of each interlocked
guard individually. Operators, maintenance personnel, and
others associated with the operation of the machine must
be trained to recognize such failures and be instructed to
correct them immediately.
Open and close each safeguard separately while verifying that
the Module outputs operate correctly throughout the check
procedure. Follow each safeguard closure with a manual reset, if
needed. If a contact set fails, the Module will not enable its reset
function. If the Module does not reset, a switch may have failed;
that switch must be immediately replaced.
This check must be performed and all faults must be cleared, at
a minimum, during periodic checkouts. If the application can
not exclude these types of failures and such a failure could
result in serious injury or death, then the series connection
of safety switches must not be used.
Category 2
A single-channel interlocked guard application typically provides
a category 2 level of circuit performance, because a short circuit
could cause the loss of the safety function. The principle of fault
exclusion must be incorporated into the design and installation
to either eliminate, or reduce to an acceptable (minimal) level of
risk, the possibility of undetected faults or failures that can result
in the loss of the safety function.
Open
(a)
(b)
(c)
MMD-TA-..B
A1
0V dc +24V dc
A2
X6
X5
X8
S12
S11
S22
(d) X7 S21
MSSI or SSI
Open Open
Figure 3-19. MSSI or SSI Category 2 interfacing: positive opening