Safety instructions and general notes
2.7 Enabling button
Mobile Panel 277 RO
Operating Instructions, 10/2015, A5E36824256-AA
27
The Stop category of the enabling control device must be selected on the basis of a risk
assessment and correspond to a Category 0 or 1 Stop.
Conditions for the use of enabling buttons
Enabling buttons may only be used if the person activating them promptly recognizes a
danger to personnel and can immediately take steps to avoid the danger!
Commands for unsafe conditions are not permitted to be issued with one enabling button
alone. For this purpose, a secondary, conscious start command by means of a button on
the Mobile Panel 277
RO is required. The only person allowed to remain in the danger zone
is the person who is activating the enabling button.
In special operating modes, safety is achieved through use of the enabling button in
combination with reduction in the velocity of the drives that are posing the danger.
Unauthorized fixing of the enabling button in the "Enable" position by mechanical means is
considered foreseeable misuse which can be prevented. We recommend the following
measures for this, which result in standstill of the machine in manual mode:
● Scan the enabling buttons
The scan has to be carried out for the following processes:
– When the system being monitored is switched on
– When the operating mode changes from "Automatic" to "Manual mode"
In both cases, the enabling function may not be used.
● The enabling button must be released within a specified time frame and returned to the
"Enable" position.
Select the time frame according to the activity on the system being monitored.
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