Safe standstill
Functional test
11
11.4
11.4-1
EDSVF9333V EN 3.0-06/2005
11.4 Functional test
Stop!
If the functional test leads to impermissible states at the
terminals, commissioning is prohibited!
ƒ After the installation the 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.
Both disconnecting paths must be checked independently for their
disconnecting ability.
The safety relay K
SR
is provided with a forcibly guided feedback contact
(X11/K32, X11/K31). When the safety relay is disconnected, this feedback
must be evaluated.
X11/K32 Input ”safe standstill” X11/34 Feedback X11/K31
HIGH LOW HIGH
HIGH HIGH LOW
Monitoring can be executed continuously with a PLC. It must, however, at
least be carried out once in the defined inspection interval.
This disconnecting path must be checked while the pulse release is activated
(X11/34 = HIGH by the safety relay K
SR
.
1. Inhibit the controller (X5/28 = LOW).
2. Enter a setpoint n
set
> 0; the motor must not rotate.
– It is possible to monitor the motor via visual inspection.
1. disconnecting path: Pulse
inhibit
2. disconnecting path:
Controller enable
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