3
SRB 304ST
Operating instructions
Safety-monitoring module
EN
Outputs:
Number of safety contacts:
3
Number of auxiliary contacts:
1
Number of signalling outputs:
3
Max. switching capacity of the safety contacts:
13-14, 23-24, 33-34:
max. 250 V, 8 A ohmic (inductive in
case of suitable protective wiring);
AC-15: 230 VAC / 6 A, DC-13: 24 VDC / 6 A;
residual current at ambient temperature
up to 55°C: 24 A / 60°C: 18 A
Switching capacity of the signalling outputs:
Y1-Y3: 24 VDC / 100 mA
Switching capacity of the auxiliary contacts:
41-42: 24 VDC / 2 A
Fuse rating of the safety contacts:
external (I
k
= 1000 A)
to EN 60947-5-1
Safety fuse 10 A quick blow, 8 A slow blow
Fuse rating of the signalling outputs:
100 mA slow blow
Fuse rating for the auxiliary contacts:
external (I
k
= 1000 A)
to EN 60947-5-1
Safety fuse 2.5 A quick blow, 2 A slow blow
Utilisation category to EN 60947-5-1:
AC-15, DC-13
Dimensions H x W x D:
100 mm × 45 mm × 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
PFH value:
≤ 2.0 x 10
-8
/h
SIL:
up to 3
Service life:
20 years
The PFH value of 2.0 × 10
-8
/h applies to the combinations of contact
load (current through enabling contacts) and number of switching
cycles (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 45 x 121 mm
with plugged-in terminals: 120 × 45 × 121 mm
4. Rear side 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
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 A1-A2 is ON and the fuse has not been
triggered).
5.2 Description of the terminals
(see Fig. 1)
Voltages:
A1
A1.1
A2
+24 VDC / 24 VAC
+24 VDC / 24 VAC
0 VDC / 24 VAC
Inputs:
S11-S12
S21-S22
S31-S32
Input channel 1 (+)
Input channel 2 (–)
(with cross-wire short detection)
Input channel 2 (+) (without cross-wire
short detection)
Outputs:
13-14
23-24
33-34
41-42
First safety enabling circuit
Second safety enabling circuit
Third safety enabling circuit
Auxiliary NC contact as signalling contact
Start:
X1-X2
X3-X4
X4-X5
Y1 + Y2
Y3
Feedback circuit
Feedback circuit and external reset
(monitored)
Automatic start
Signalling output channel 1 and 2
Signalling output fuse F3
Signalling outputs must not be used in safety circuits.
