schmersal PSC1-C-10 Series Installation Manual page 70

Installation manual
4.3.4.2.2 Single-channel switching relay or semiconductor output with external device for
increasing the switching rating and testing
On the usage of an external device for increasing the switching rating, or downstream
electromechanical, pneumatic or hydraulic components, a device for testing the complete chain and a
signaling/warning device on the detection of a fault are required to achieve PL c or higher.
In particular, positively driven auxiliary contacts are required for electromechanical devices, or valve
position signal contacts are required for hydraulic or pneumatic components.
The signaling/warning device must immediately make clear the hazardous situation to the operator.
The achievable PL is heavily dependent on the test rate, a maximum of PL d according to EN ISO
13849-1 can be achieved!
X21
Q0_P
Q1_N
Q2_P
Q3_N
X12
I12
I13
T0
T1
X13
NC
NC
Y0
Y1
L +
L -
Single-channel switching relay output with testing
Safety instructions:
•
Only recommended to a limited extent for safety applications! On this topic see also the
information in EN ISO 13849-1 on usage and the fault exclusions necessary.
•
For category 2 a test rate > 100 * demand rate is required
•
If a hazardous situation is detected during a test of the safety function, suitable control
measures must be initiated.
A safe state must be initiated for PL d, which must not be canceled until the error has been
eliminated.
•
For PL c and higher a signaling/warning device is required that immediately makes clear the
hazardous situation to the operator
PSC1-C-10 Installation manual V2.6
Version: 57E
Page 70 of 173