Appropriate Applications - Banner DUO-TOUCH SG Manual

The DUO-TOUCH SG Two-Hand-Control Safety Module may be used as an initiation
device for most pow ered ma chin ery, where ma chine cycling is controlled by a
machine operator.
When using a two-hand-control system for safeguarding, both of the operator's
hands must be used to initiate the machine cycle. In effect, this makes the operator
a "hostage" while the hazard is present, thus limiting or preventing exposure to the
hazard. The two-hand-control actuators must be located so that hazardous motion
(for example, closing of the die) is complete or stops before the operator can release
one or both of the buttons and reach the hazard (see page 7, Minimum Safety
Distance).
Concurrent use of both hands is required, meaning that both buttons must be
actuated simultaneously – within a very short time span. This time span is specified
by EN 574/ISO 13851 as not more than 500 ms, even under single-fault conditions.
This requirement not only reduces the possibility of intentional defeat, but also
reduces the chance of unintended initiation of the machine cycle.
The machine control, when used in single cycle or single stroke mode, must provide
an anti-repeat feature so that at the end of one machine cycle, further cycles are
prevented and the operator must release the two-hand-control actuators before the
next cycle can be initiated (see Caution at right).
The STB Touch Buttons must be protected from accidental or unintended operation.
This can be accomplished by their mounting position and/or through the use of
protective shields such as rings, guards or shields. Suggested methods are shown on
page 6.
It should be noted that two-hand-control and two-hand-trip safeguarding protect only
the operator's hands. Additional safeguarding or other appropriate standards may be
required.
The user must refer to the relevant standards for additional requirements for
the application of two-hand-control and two-hand-trip devices when used as a
safeguarding means.
Power
Feedback Loop*
SW1
SW2
Output
< 0,5 s
Figure 2. DUO-TOUCH SG Safety Module AT-FM-10K timing diagram
4
page
®
DUO-TOUCH

Appropriate Applications

< 0,5 s > 0,5 s Feedback
Open
SG –
Two-Hand-Control Kits with STB Touch Buttons
SW1 tied SW2 tied
down down
CAUTION
!
Anti-Repeat Control
Device
Anti-repeat control is not a function
of the DUO-TOUCH SG Two-Hand-
Control Safety Module. The user of this
device must provide a suitable means of
accomplishing anti-repeat control for any
single-stroke or single-cycle machine.
* Feedback loop can remain closed at all times
(if jumpered), when no monitoring contacts are
available (see also Feedback Loop on page 8.)
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
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