Lenze EVF9383 - Manual (Page 419)

Safety engineering
Functional test
Important notes
11
11.4
11.4.1
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11.4−1 EDSVF9383V EN 7.1−04/2012
11.4 Functional test
11.4.1 Important notes
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Danger!
Unexpected start−up of the machine possible
The "Safe torque off" safety function provides protection against
an unexpected start−up of the drive and therefore is an
important item within the safety concept for a machine. It has to
be ensured that this function works correctly.
Possible consequences:
ƒ Death, severe injury, or damage to material assets, when the
safety function fails.
Protective measures:
After the installation and at regular intervals, the operator has to
check the function of the "Safe torque off" circuit.
ƒ When doing this, check both disconnecting paths separately
with regard to their disconnection capability.
ƒ The functional test can be carried out manually or
automatically via the PLC.
ƒ Basically the inspection interval depends on the application
and the corresponding risk analysis, as well as on the system
as a whole. It should not exceed 1 year.
ƒ If the functional test shows impermissible states,
– the drive or the machine has to be shut down immediately.
– commissioning is not permitted until the safety function
operates correctly.