Lenze EVF9333−xV - Manual (Page 475)

Safety engineering
Important notes
11
11.1

11.1-1 EDSVF9333V EN 6.2-04/2012
11.1 Important notes

Stop!
In the case of the devices EVF9335 ... EVF9383 of variants V060,
V110, V270, and V300, the integrated brake transistor is
deactivated if the ”Safe torque off” function is active.
The controllers of variants V004 and V024 support the safety functions ”Safe
torque off” (old designation ”safe standstill”), ”Protection against
unexpected start-up”, in accordance with the requirements of control
category 3 of EN 954 Part 1 and Part 2. Depending on the external wiring, a
standard up to category ”3” in accordance with EN 954-1 is achieved.

Note!
In order to comply with control category 3 in accordance with 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).