4
Operating instructions
Safety-monitoring module
SRB 202CS / SRB 202CS/T / SRB 202CA/T /
SRB 202CA/QT / SRB 202CA / SRB 202CA/Q
EN
L1
K1
K1
K2
K2
K3
K4
42
13
24
X2
S41
S22
S12
A1
24 VDC
J
X1
S31 S32
S42
31
14
A2
F1
UB
K
A
K
B
K
C
K
D
K
C
K
D
a)
K1
K3
K4
K2
32
K3
K4
S
K
B
N
Ui
K
A
K
C
K
D
Fig. 2: SRB 202CS, 202CS/T
a) Logic
Dual-channel control, shown for a emergency stop circuit;
with two contacts A and B and a guard door monitor with two
contacts C and D, where at least one is a positive break contact;
with external reset button
J
(related on the switch-off level 1)
(see Fig. 3)
• Relay outputs: Suitable for 2-channel control, for increase in capacity
or number of contacts by means of contactors or relays with positive-
guided contacts.
•
The control system of the emergency stop circuit detects wire breakage
and earth faults (cross-wire shorts in the SRB 202CA/QT and SRB
202CA/Q versions). The control system of the door monitoring circuits
detects wire breakage, earth faults and cross-wire shorts.
•
S
= Feedback circuit
Channel B of SRB 202CA/Q and SRB 202CA/QT: 0 V – S22
(see Fig. 4)
L1
K1
K1
K2
K2
K3
K4
42
13
24
X2
S43
S22
S12
A1
24 VDC
J
X1
S31 S32
S44
31
14
A2
F1
UB
K
A
K
B
K
C
K
D
K
C
K
D
a)
K1
K3
K4
K2
32
K3
K4
S
K
B
N
Ui
K
A
K
C
K
D
Fig. 3: SRB 202CA, 202CA/T, SRB 202CA/Q, SRB 202CA/QT
a) Logic
S12
S22
24 VCC 0 V
Fig. 4
Due to the operating principle of the electronic fuse, the
customer must check that no hazard is caused by an
unexpected restart in circuits without reset button
(automatic reset).
6 Set-up and maintenance
6.1 Functional testing
The safety function of the safety-monitoring module must be tested.
The following conditions must be previously checked and met:
1. Correct fixing
2. Check the integrity of the cable entry and connections
3. Check the safety-monitoring module’s enclosure for damage.
4. Check the electrical function of the connected sensors and
their influence on the safety-monitoring module and the
downstream actuators
6.2 Maintenance
A regular visual inspection and functional test, including the following
steps, is recommended:
1. Check the correct fixing of the safety-monitoring module
2. Check the cable for damages
3. Check electrical function
Damaged or defective components must be replaced.
7 Disassembly and disposal
7.1 Disassembly
The safety-monitoring module must be disassembled in a de-energised
condition only.
7.2 Disposal
The safety-monitoring module must be disposed of in an appropriate
manner in accordance with the national prescriptions and legislations.
8 Appendix
8.1 Wiring examples
Dual-channel control, shown for a emergency stop circuit;
with two contacts A and B and a guard door monitor with two
contacts C and D, where at least one is a positive break contact;
with external reset button
J
(related on the switch-off level 1)
(see Fig. 2)
• Relay outputs: Suitable for 2-channel control, for increase in capacity
or number of contacts by means of contactors or relays with positive-
guided contacts.
•
The control system recognises wire-breakage and earth faults in the
monitoring circuit.
•
S
= Feedback circuit
