5
SRB 301LC/B
SRB 301LC/B-R
Operating instructions
Safety-monitoring module
EN
The connection of magnetic safety switches to the
SRB 301LC/B and SRB 301LC/B-R safety-monitoring
module is only admitted when the requirements of the
standard EN 60947-5-3:2005 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
For example, the following safety sensors meet the
requirements:
– BNS 33-02z-2187, BNS 33-02zG-2187
– BNS 260-02z, BNS 260-02zG
– BNS 260-02-01z, BNS 260-02-01zG
When sensors with LED are wired in the control circuit
(protective circuit), the following rated operating voltage
must be observed and respected:
– 24 VDC with a max. tolerance of –5 %/+ 20 %
– 24 VAC 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.
Dual-channel control of a safety-related (microprocessor-based)
safety guards with p-type transistor outputs e.g. AOPD's to
IEC 61496-1 (Fig. 10)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the monitoring circuits are usually detected
by the safety guards. The safety-monitoring module therefore is not
equipped with a cross-wire short detection.
• If cross-wire shorts in the control circuits are detected by the safety
guard: Control category 4 – PL e to ISO 13849-1 possible.
S12 S22
S11
S11
S22
S12
S11
S11
S12 S22
+24V
+24V
Fig. 8
Fig. 9
Fig. 10
8.4 Actuator configuration
Single-channel control with feedback circuit (Fig. 11)
• Suitable for increase in capacity or number of contacts by means
of contactors or relays with positive-guided contacts.
•
S
= feedback circuit: If the feedback circuit is not required,
establish a bridge.
Dual-channel control with feedback circuit (Fig. 12)
• Suitable for increase in capacity or number of contacts by means
of contactors or relays with positive-guided contacts.
•
S
= feedback circuit: If the feedback circuit is not required,
establish a bridge.
X1
X2
13
14
K
A
K
A
S
N
L1
K
A
X1
X2
13
14
K
A
K
A
S
N
L1
K
B
K
B
K
B
K
A
Fig. 11
Fig. 12
