Lenze EVS9332xS - Manual (Page 346)

Safety engineering
Important notes
11
11.1
l
11.1−1 EDSVS9332S EN 6.0−07/2013
11.1 Important notes
The controllers support the safety functions "Safe torque off" (former
designation "Safe standstill"), "Protection against unexpected start−up", in
accordance with the requirements of control category 3 of ISO 13849−1
(former EN 954−1). Depending on the external interconnection, a standard
up to "category 3" in accordance with ISO 13849−1 is achieved.
)
Note!
In order to comply with control category 3 in accordance with
ISO 13849−1 (former EN 954−1), the two methods "Pulse inhibit
via safety relay K
SR
" and "Controller inhibit", which are
independent of each other, have to be used.
ƒ Only qualified personnel may install and commission the Safe torque
off" function.
ƒ All control components (switches, relays, PLC, ...) and the control
cabinet must comply with the requirements of EN ISO 13849−1 and
EN ISO 13849−2. This includes among other things:
– Control cabinet, switches, relays in enclosure IP54!
– All other requirements can be found in EN ISO 13849−1 and
EN ISO 13849−2!
ƒ Wiring with insulated wire end ferrules or rigid cables is absolutely
required.
ƒ All safety−relevant cables (e.g. control cable for the safety relay,
feedback contact) outside the control cabinet must be protected, e.g.
by a cable duct. It must be ensured that short circuits between the
individual cables cannot occur!
ƒ With the Safe torque off" function no emergency stop can be effected
without additional measures:
– There is neither an electrical isolation between motor and controller
nor a service or repair switch!
– An "Emergency stop" requires the electrical isolation of the conductor
to the motor, e.g. by means of a central mains contactor with
emergency stop wiring.
ƒ If in the case of the "Safe torque off" a force effect is to be expected
from outside, (e.g. sagging of hanging loads), additional measures are
required (e.g. mechanical brakes).
ƒ After the installation the operator has to check the function of the
"Safe torque off" circuit.
– The functional test must be repeated at regular intervals.
– Basically, the inspection intervals depend on the application, the
related risk analysis, and the overall system. The inspection intervals
must not be longer than 1 year.