Safe standstill
Important notes
Additional safety instructions
11
11.1
11.1.1
11.1-1
EDSVF9333V EN 3.0-06/2005
11.1 Important notes
The controllers supports the ”safe standstill” safety function and protects
against unexpected start-up according to the requirements of EN 9541
Control c ategory 3”, part 1.
2 The controllers are therefore equipped with two independent switch-off
paths.
11.1.1 Additional safety instructions
ƒ Only qualified personnel are permitted to install and set up the “safe
standstill function”.
ƒ All control components (switch, relay, PLC, ...) and the control cabinet
must correspond to the requirements of the EN 954-1 and ISO 13849-2.
This includes among other things:
– Switch, relay with enclosure IP54!
– Control cabinet with enclosure IP54!
– Further requirements can be obtained from the EN 954-1 and
ISO 13849-2!
ƒ Wiring with insulated wire end ferrules or rigid cables is absolutely
vital.
ƒ All safety-relevant cables (e. g. control cable for the safety relay,
feedback contact) outside the control cabinet must be protected, for
instance, by a cable duct. In this connection, make sure that short
circuits between the single cables cannot occur!
ƒ When using the “safe standstill” function, additional measures are
required for ”Emergency off”:
– Motor and controller are not isolated and not equipped with a service
switch or repair switch!
– An emergency-off function requires the isolation of the conductor to
the motor, e. g. by a central mains choke with emergency-off wiring.
ƒ If an external force is likely to act in case of ”safe standstill”,”e. g.
stalling of hanging loads), additional measures have to be provided (e.
g. mechanical brakes).
ƒ After the installation, t he operator must check the ”safe standstill”
function.
ƒ The functional test must be repeated at regular intervals.
– Basically, the intervals to be selected depend on the application and
the risk analysis involved as well as on the total system (inspection
interval). The inspection interval should not exceed 1 year.
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