Safe standstill
Functional test
Automatic cyclic monitoring of ”safe standstill” with PLC
11
11.4
11.4.1
11.4-3
EDSVF9333V EN 3.0-06/2005
Stop!
If the function test leads to impermissible states at the
terminals, you must switch off the drive.
1. Disconnecting path: Pulse inhibit by safety relay K
SR
ƒ The following must apply for the safety relay K
SR
:
– If X11/34 = LOW, then X11/K31 = HIGH.
– If X11/34 = HIGH, then X11/K31 = LOW.
2. Disconnecting path: Controller enable
ƒ The following condition must be checked:
– If X5/28 = LOW and X11/34 = HIGH and n
set
>0,then
DIGOUT = HIGH.
DIGOUT (is called DIGOUT4 in the example) is to present a feedback of the
output current to the motor to check the efficiency of the controller enable.
The following example shows how to create a digital output signal
I
motor
<I
threshold
.
All codes and parameters required for a configuration via keypad XT or
Global Drive Control (GDC) are indicated.
Sequence Code parameter setting
1. Configure f unction block CMP3 (comparator)
A Link CMP3-IN1 with MCTRL-IACT C0693/1 = 5004
B Link CMP3-IN2 with FCODE-472/1 C0693/2 = 19521
C Configure the function IN1 < IN2 C0690 = 3
2. Configure output signal of CMP3
A Link DIGOUT4 with CMP3-OUT C0117/4 = 10660
3. Enter function block CMP3 into the processing table
A
Select a free place in the processing table
In the Lenze setting, for instance, place 2 in the processing
table is free.
C0465/2 = 10660
4. Current threshold setting
A Set the current threshold for I
rated_FI
to 2 % C0472/1 = 2.00
Cyclic function test (in
inspection interval)
Example for parameter
setting of output DIGOUT
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