4
Operating instructions
Safety-monitoring module
SRB 301LC/B
SRB 301LC/B-R
EN
If a manual functional check is necessary to detect a possible
accumulation of faults, then this must take place during the
intervals noted as follows:
• at least every month for PL e with category 3 or category
4 (according to ISO 13849-1) or SIL 3 with HFT (hardware
fault tolerance) = 1 (according to IEC 62061);
• at least every 12 months for PL d with category 3
(according to ISO 13489-1) or SIL 2 with HFT (hardware
fault tolerance) = 1 (according to IEC 62061).
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.
Push up the bottom of the enclosure and hang out slightly tilted
forwards.
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 guard door monitor with
two position switches where one has a positive break contact;
with external reset button
J
(Fig. 2)
• Relay outputs: 2-channel control, suitable for increase incapacity 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.
K
A
K
B
N
K2
K1
14 24 34 42
K2
a)
K1
Ui
F1
K
B
K
A
A2
A1
S12 S11
J
S21 S22 X1 X2
13 23
L1
S
K
B
K
A
33 41
Fig. 2
a) Logic
S
= Feedback circuit
8.2 Start configuration
External reset button (Fig. 3)
• The external reset button is integrated in the feedback circuit in series.
• The manual start or the activation of the module occurs when the
button is pressed (not when it is released!).
Automatic start (see Fig. 4)
• The automatic start is programmed by connecting the feedback
circuit to the terminals X1-X2. If the feedback circuit is not required,
establish a bridge.
•
Caution: Not admitted without additional measure due to the risk
of gaining access by stepping behind!
• When the safety-monitoring modules are used with the operating
mode "Automatic start", an automatic restart after a shutdown in
case of emergency must be prevented by the upstream control to
EN 60204-1 paragraph 9.2.5.4.2.
K
B
J
S
K
A
X2
X1
K
B
S
K
A
X2
X1
Fig. 3
Fig. 4
8.3 Sensor configuration
Single-channel emergency stop circuit with command devices to
ISO 13850 and EN 60947-5-5 (Fig. 5)
• Wire breakage and earth leakage in the control circuits are detected.
• Category 1 – PL c to ISO 13849-1 possible.
Dual-channel emergency stop circuit with command devices to
ISO 13850 and EN 60947-5-5 (Fig. 6)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible
(with protective wiring)
Single-channel guard door monitoring circuit with interlocking
devices to ISO 14119 (Fig. 7)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Category 1 – PL c to ISO 13849-1 possible.
S12 S22
S12
S11
A
S12 S22
S11
S11
A
S12 S22
S12
S11
Fig. 5
Fig. 6
Fig. 7
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (Fig. 8)
• With at least one positive-break position switch
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible (with protective
wiring)
Dual-channel control of magnetic safety switches to EN 60947-5-3
(see Fig. 9)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Category 3 – PL e to ISO 13849-1 possible.
