6
Operating instructions
Safety-monitoring module
SRB 202CS / SRB 202CS/T / SRB 202CA/T /
SRB 202CA/QT / SRB 202CA / SRB 202CA/Q
EN
8.3.3 Sensor configuration
Dual-channel control of magnetic safety switches to EN 60947-5-3
(see Fig. 14)
• The control system recognises wire-breakage, earth faults and
cross-wire shorts in the control circuits.
S32
S31
S44
S43
Fig. 14
SRB 202CA, SRB 202CA/T, SRB 202CA/Q, SRB 202CA/QT
The connection of magnetic safety switches to the
SRB 202C.. safety-monitoring modules is only admitted
when the requirements of the standard EN 60 947-5-3
are observed.
As the technical data are regarded, at least the following
requirements must be met:
• Switching capacity: min. 3 W
• Switching voltage: min. 30 VDC
• Switching current: min. 10 mA
For example, the following safety sensors from Schmersal
meet the requirements:
• BNS 33-11z, BNS 33-12z-2063, BNS 33-11z-2063
• BNS 250-11z
• BNS 120-11z
• BNS 180-11z
• BNS 303-11z
Caution!
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 %
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.
8.4
Actuator configuration
Single-channel control (see Fig. 15)
•
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.
• A = switch-off level 1, B = switch-off level 2
* Disabling of the enabling circuits 13-14, 13-24 when switch-off level 1
is triggered, disabling of the enabling circuit 13-24 when switch-off
level 2 is triggered
Dual-channel control (Fig. 16)
•
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.
• A = switch-off level 1, B = switch-off level 2
* Disabling of the enabling circuits 13-14, 13-24 when switch-off level
1 is triggered, disabling of the enabling circuit 13-24 when switch-off
level 2 is triggered
X1
X2 13
14
L1
N
K
A
K
A
K
B
24
K
B
K
B
*
*
J
J
X1
X2 13
14
24 VDC
N
K
A
K
B
K
C
K
D
K
C
K
D
24
*
K
A
K
B
K
C
K
D
*
J
J J
Fig. 15
Fig. 16
