3
SRB 301AN
Operating instructions
Safety-monitoring module
EN
Protection of the safety contacts:
external (I
k
= 1000 A)
to EN 60947-5-1
Safety fuse 8 A quick blow, 6 A slow blow
Fuse rating of the signalling output:
Y1: 500 mA (internal
electronic fuse)
Utilisation category to EN 60947-5-1:
AC-15 / DC-13: EN 60947-5-1
Dimensions (H x W x D):
100 x 22.5 x 121 mm
The data specified in this manual are applicable when the
component is operated with rated operating voltage U
e
±0%.
2.5 Safety classification
Standards:
EN ISO 13849-1, IEC 61508, EN 60947-5-1
PL:
up to e
Control category:
up to 4
DC:
99% (high)
CCF:
> 65 points
PFH value:
≤ 2.00 × 10
-8
/h
SIL:
up to 3
Service life:
20 years
The PFH value of 2.00 × 10
-8
/h applies to the combinations of contact
load (current through enabling contacts) and number of switching cy-
cles (n
op/y
) mentioned in the table below. At 365 operating days per year
and a 24-hours operation, this results in the below-mentioned switching
cycle times (t
cycle
) for the relay contacts.
Diverging applications upon request.
Contact load
n
op/y
t
cycle
20 %
525,600
1.0 min
40 %
210,240
2.5 min
60 %
75,087
7.0 min
80 %
30,918
17.0 min
100 %
12,223
43.0 min
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. Electrical connection
4.1 General information for electrical connection
As far as the electrical safety is concerned, the protection
against unintentional contact of the connected and therefore
electrically interconnected apparatus and the insulation of the
feed cables must be designed for the highest voltage, which
can occur in the device.
The electrical connection may only be carried out by autho-
rised 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
i
: Status internal operating voltage (LED is on, when the operating
voltage on the terminals A1-A2 is ON and the fuse has not been
triggered).
5.2 Description of the terminals
Voltages:
A1
A2
+24 VDC/24 VAC
0 VDC/0 VAC
Inputs:
S13 - S14
S21 - S22
Input channel 1
Input channel 2
Outputs:
13 - 14
23 - 24
33 - 34
Y1
First safety enabling circuit
Second safety enabling circuit
Third safety enabling circuit
Signalling output
Start:
X1 - X2
X1 - X3
Feedback circuit and external reset
(monitored)
Automatic start
K1
U
i
K2
SRB
301AN
13 23 33 Y1
A1 X1 X2 X3
14 24 34 S13
A2 S21 S22 S14
Fig. 1
5.3 Notes
Signalling outputs must not be used in safety circuits.
Due to the operating principle of the electronic fuse, the cus-
tomer must check that no hazard is caused by an unexpected
restart in circuits without reset button (automatic reset).
