Functional safety
FUNCTIONAL SAFETY
Design requirements
9.
Ref.1912
· 317 ·
DDS
HARDWARE
9.4 Design requirements
This section describes some of the design requirements for the use of the
AXD/SPD.To obtain information about the wiring, see
9.9 Cabling and
grounding
.
Power-up
On power-up, the external safety controller must demand the safety function.
The safety controller
AXD/SPD safety functions extend to Cat.3 PL d - SIL 2. When a machine
requires a PL d feature level or a SIL 2 safety integrity level, it requires an
external safety controller PL d or SIL 2 that provides two different channels
to demand the safety functions. See the examples below.
SS1, set GP9
To execute the SS1, the safety controller activates the SPEED ENABLE input
or a FAGOR PLC input that activates the SERCOS SPENA. In response, the
drive will stop the motor and wait for GP9 before removing the motor torque.
GP9 must be the
Actual response time of the holding brake. Note that GP9
is a conventional parameter and it is not a safety parameter.
Operating mode and configuration
The functional safety only has a normal operating mode. Therefore, they do
not have any special mode for configuration or maintenance.
The STO safety function is not configurable. See
SS1, set GP9.
Examples for EN ISO 13849-1
Example 1.
STO application that meets with Cat. 3, PL d - SIL 2
NOTE. Examples of designs for the safety-related parts of the SRP/CS
control system of machines using AXD/SPD STO safety function, accord-
ing to standard ISO 13849-1.
NOTE. The examples do not take into account the holding brake control by
the external safety controller.
F. H9/2
STO safety function, Cat. 3, PL d - SIL 2.
KM1 auxiliary contact of - KM1 with EN 60947-5-1 approval
State definition: Drive Enable = O
Torque Off
Positive logic
EXTERNAL SAFETY
CONTROLLER
Cat.3 PL d, ISO 13849-1
A1
A2
11 12 21 22 23
S33 S34
14 24
13
24 V
- F
- KM1
M
X2
X7
Drive Enable
AS1
AS2
KM1 ON
LINE/MAIN
AXD/SPD
PS/XPS/RPS
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