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Dual-channel control of magnetic safety switches according to EN 60947-5-3
• Wire breakage and earth leakage in the control circuits are
detected.
• Cross-wire shorts between the control circuits are detected.
• Control category 4 – PL e to DIN EN ISO 13849-1 possible
S12
S22
S11
S21
nQS
QS
The connection of magnetic safety switches to the SRB301ST safety-monitoring module is only admitted
when the requirements of the standard EN 60947-5-3 are observed.
As the technical data are regarded, the following minimum requirements must be met:
•
Switching capacity: min. 240 mW
•
Switching voltage: min. 24 VDC
•
Switching current: min. 10 mA
When sensors with LED are wired in the control circuit (protective circuit), the following rated operating voltage
must be observed and respected:
• 24 V DC with a max. tolerance of −5 %/+20 %
• 24 V AC with a max. tolerance of −5 %/+10 %
Otherwise availability problems could occur, especially in series-wired sensors, where a voltage drop in the
control circuit is triggered by LED’s for instance.
6.4.3. Actuator configuration
Single-channel control
• Suitable for increase in capacity or number of contacts by means
of contactors or relays with positive-guided contacts.
• If the feedback circuit is not required, establish a bridge.
•
H2
= Feedback circuit and external reset in series
S12
X3
13
14
K
A
K
A
K
A
L1
N
H2
