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Two-hand-control safety kit

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Manual (21 pages)

Table of Contents

Installation of the DUO-TOUCH SG Safety Module

The DUO-TOUCH Safety Module must be installed inside an enclosure. It is not designed for

exposed wir ing. It is the user's responsibility to house the Safety Module in an enclosure with

IP54 rating, or better. Dimensions of the Safety Module are shown in figure 6 (page 14). The

device mounts directly onto a stan dard 35-mm DIN rail.

Heat dissipation considerations

For reliable operation, the user must ensure that the operating specifications are not exceeded.

The enclosure must provide adequate heat dissipation, so that the air closely surrounding

the module does not exceed the maximum operating temperature stated in the specifications

(page 12). Methods to reduce heat build-up include venting, forced airflow (e.g., exhaust fans),

adequate enclosure exterior surface area, and spacing between modules and other sources of

heat.

Installation of the STB Touch Button

The hand controls must be mounted in accordance with European standards EN-574/ISO 13851

and EN 999/ISO 13855, and any appropriate Type-C standard. EN-574/ISO-13851 requires

that the hand controls be mounted to pro tect them from ac ci den tal or unintentional operation.

Use shields, covers, rings, collars, dividers, or similar protection to pre vent ac ci den tal switch

actuation and to discourage use of forearms or elbows. This standard also includes a detailed

discussion of ap proach es to pro tec tion of hand controls.

Prevention of defeat using hand and elbow of the same arm:

In general, the buttons should be at least 550 mm apart (in a straight line) to avoid the operator

using the hand and elbow of the same arm or operate both hand controls by the use of only

one arm. Alternatively, the buttons should have a shield to prevent the operation by an elbow.

Prevention of defeat using one hand:

The hand controls must be arranged to require the use of both hands for simulta neous ac tu a-

tion, therefore, they should be at least 260 mm apart, to prevent operation by a single hand.

The cover supplied with the STB Touch Buttons conforms to the requirements of EN 574/ISO

13851, Cone test.

Figure 4 shows two examples for mounting the STB Touch Buttons. When mounted on top of

the control bar, the protective field covers should be in place, as shown. For added protection,

mount the STB Touch Buttons sideways under and behind a protective hood, rather than on top

of the bar, leaving the field covers off. This side mount prevents the operator from positioning

and leaving an object in the path of the beam, intentionally bypassing the safeguard.

Requirements for Multiple-Operator Control

CEN and CENELEC have specified several conditions for situations where multiple operators

work together to control one machine:

• Each operator must actuate his/her own pair of Touch Buttons, with all pairs of actuators

active at one time, in order to initiate a machine cycle; the machine may not be allowed to operate until this condition is true.

• The actuators all must be released between cycles.

• The actuation and de-actuation of all workstations requiring two-hand-control must be observable and supervisable by the employer.

• The clutch/brake control system must be designed so that the clutch cannot be actuated if all the operating workstations are bypassed.

It is the responsibility of the user to determine if this two-hand-control system can be interfaced to the machine in a manner to satisfy all existing

requirements for multiple-operator control.

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