3
SRB 301/CL1
Operating instructions
Safety-monitoring module
EN
2.5 Safety classification
Standards:
EN ISO 13849-1, IEC 61508, EN 60947-5-1
PL:
Stop 0: up to e
Category:
Stop 0: up to 4
DC:
Stop 0: 99% (high)
CCF:
> 65 points
SIL:
Stop 0: up to 3
Service life:
20 years
B
10D
value (for one channel):
Low voltages range 20%: 20,000,000
40%: 7,500,000
60%: 2,500,000
80%: 1,000,000
Maximum load 100%: 400,000
MTTF
B
d x
x
h
s/h
3600
D
10D
op
op
op
n
0,1 x n
op
t
cycle
For an average annual demand rate of n
op
= 126,720 cycles per year,
Performance Level PL e can be obtained at maximum load.
n
op
= average number of activations per year
d
op
= average number of operating days per year
h
op
= average number of operating hours per day
t
cycle
= average demand rate of the safety function in s
(e.g. 4 × per hour = 1 × per 15 min. = 900 s)
(Specifications can vary depending on the application-specific
parameters h
op
, d
op
and t
cycle
as well as the load.)
3. Mounting
3.1 General mounting instructions
Mounting: snaps onto standard DIN rails to EN 60715.
Snap the bottom of the enclosure slightly tilted forwards in the DIN rail
and push up until it latches in position.
3.2 Dimensions
All measurements in mm.
Device dimensions (H/W/D): 100 x 22.5 x 121 mm
4. Rear side Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
Wiring examples: see appendix
5. Operating principle and settings
5.1 LED functions
• K1: Status channel 1
• K2: Status channel 2
• U
B
: Status operating voltage (LED is on, when the operating voltage
on the terminals A1-A2 is ON)
• U
i
: Status internal operating voltage (LED is on, when the operating
voltage on the terminals C-D is ON and the fuse has not been
triggered)
5.2 Description of the terminals
Voltages: C
D
+24 VDC/24 VAC
0 VDC/24 VAC
Inputs:
C1-S1
C1-D1
D1-S2
Input channel 1 (+)
Input channel 2 (+)
Input channel 2 (–) (with cross-wire short detection)
Outputs: 13-14
23-24
33-34
First safety enabling circuit
Second safety enabling circuit
Third safety enabling circuit
Start:
X1-X2
41-42
Feedback circuit and external reset
Auxiliary NC contact
U
B
U
i
K1
K2
SRB
301/
CL1
C C1 23
13 S1 24
33
41
14 D1 D
X2 S2 X1
34
42
*
Fig. 1
* = with printed customer-specific logo
5.3 Notes
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.
