AB Quality MobileView Guard G750 Посібник із швидкого старту - Сторінка 8

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MobileView Guard G750

• In special operating mode, safety must be guaranteed in other ways since the

operator must enter dangerous areas of the machine, and targeted

movements must be possible. In this case, a reduced speed of the machine

must be defined by means of the risk assessment. A movement will only be

possible if an enabling device is actuated. The user must be trained and

must know the details of the intended use. The safety related parts of the

control for reducing speed and for the enabling device must be constructed

so that they meet the safety category according to EN 954-1, defined by the

risk assessment.

To meet safety category 3 in accordance with EN 954-1, the enabling switch must

be implemented with 2 circuits.

EN 60204-1 describes the functioning of the enabling device. Due to the latest

findings of analysis of accidents and since technical solutions are available, the

3-position enabling switch became state of the art. The positions 1 and 3 of the

enabling switch are OFF functions. Only the central position is used for enabling.

The EN 60204-1 is identical with IEC 60204-1. So the 3-position enabling switch is

of international relevance.

The enabling switch consists of a 3-position operating element and separated

evaluation electronics. Essential features are the continuous two-channel circuits

between the actuating elements and the connecting terminals. For the evaluation

circuits, different technologies and circuits are used. Because of the electronic

switching contacts, their lifetime does not depend on the load as long as the

nominal values of the load (ohmic, inductive and capacitive) are not exceeded.

ATTENTION

Publication 2727-QS002E-MU-P

• Enabling switches may only be used if the operator

activating the switch recognizes the dangerous situation in

time to take immediate action if necessary.

• The enabling switch is only used to enable commands for

performing dangerous movements. The commands must

be activated by a separate operating element (key on

terminal). Only persons allowed to activate the enabling

switch are allowed to work in the dangerous area.

• On the MobileView Guard terminal, the enabling switches

always feature 2 circuits.