Banner DUO-TOUCH SG Manual page 5

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DUO-TOUCH
Part-Revolution Clutched Machinery
EN 692 "Mechanical Presses – Safety" allows a two-hand-control safety module to operate part rev o lu tion power presses for any
of the following functions: "inch" (jog), "single-stroke" or "continuous" (run). Two-hand-control safety modules are recognised
as a means of pro tect ing the machine operator when the hand controls are safely located and protected from false operation
(see pages 6 and 7) and when the two-hand trip device is properly interfaced to the machine (see pages 8 and 9) to control the
required stopping action.
Full-Revolution Clutched Machinery
A two-hand-control safety module used to initiate the cycle of a full-revolution clutched machine is known as a "two-hand-trip
device." Two-hand-trip devices are recognised by CEN and CENELEC as a means of protecting the machine operator when the
hand con trols are safely lo cat ed and protected from false operation (see pages 6 and 7) and when the two-hand-trip de vice is prop-
er ly in ter faced to the ma chine (see pages 8 and 9) to prevent ac ci den tal cycle ini ti a tion.
The input circuit of the DUO-TOUCH SG Safety Module requires simultaneous ac tu a tion of both two-hand-con trol actuators to
generate an output signal. European standard EN 574/ISO 13851 requires that the two hand controls be actuated within 0,5
seconds of each other.
The timing diagram in Figure 2 (page 4) il lus trates that an output signal from the DUO-TOUCH SG Safety Module occurs only if
switch #1 (SW1) and switch #2 (SW2) are ac tu at ed within 0,5 seconds of each other. The total response time (from the time the
devices are disengaged until the module's output contacts open) is 0,035 seconds + 0,020 seconds = 55 milliseconds. The device
output does not re-energise until both hand controls are dis en gaged, and then si mul ta neous ly re-actuated. This logic reduces the
possibility of defeat of the two-hand-control by tying down one or both hand controls.
STB Self-Checking Optical Touch Buttons are identical in fit and form with the proven and popular OTB Series buttons. The internal
design of the new buttons, however, based on diverse-redundant microcontrollers, allows the wiring to a Banner DUO-TOUCH
SG Two-Hand-Control Safety Module designed and certified to Type IIIC per EN 574/ISO 13851 (requiring 1 normally open and 1
normally closed contact per input channel).
The STB is a photoelectric "beam-break" activation device that incorporates a self-checking optical circuit designed to detect
internal safety-critical faults. Both the emitter and receiver are continuously exercised and monitored via secondary photoelements.
If a fault is detected, the microcontrollers will hold the outputs in the OFF state and flash a Fault LED to alert an operator.
All models are supplied with a yellow polypropylene field cover to prevent inadvertent switching.
A
B
C
Figure 3. STB Touch Button features
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
SG –
Two-Hand-Control Kits with STB Touch Buttons
STB Touch Button Description
STB Touch Button LED Indicators
Power On (green):
ON when power is applied
Output, Fault (green):
ON when button is activated
OFF when button is not activated
Flashing when a fault condition is
detected
E
Key Legend:
A Polypropylene Field Cover
B Black Polysulfone Upper Housing
D
C Yellow Fibre Reinforced PBT Base
D Output Fault LED
E Power ON/OFF LED
Theory of Operation
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