6
Operating instructions
Safety-monitoring module
SRB-E-402ST
EN
7. Wiring examples
7.1 Possible applications
All applications for 1 or 2-channel safe evaluation for protective
equipment as follows:
• Safety door monitoring to ISO 14119
• Position switches with positive break to IEC/EN 60947-5-1
• Safety sensors to EN 60947-5-3
• Emergency stop command devices to DIN EN ISO 13850 (EN 418)
and EN 60947-5-5
• Magnetic safety sensors to EN 60947-5-3
• Safety light curtain and photoelectric barriers according to
EN IEC 61496
• Two-hand control panels to ISO 13851 type IIIA and IIIC
The connection of magnetic safety switches to the SRB-E-...
safety-monitoring module is only admitted when the
requirements of the standard IEC 60947-5-3 are observed.
As the technical data are regarded, the following minimum
requirements must be met:
• Switching capacity: min. 240 mW
• Switching voltage: min. 24 VDC
• Switching current: min. 10 mA
For example, the following safety sensors meet the
requirements:
• BNS 36-02Z(G), BNS 36-02/01Z(G)
• BNS 260-02Z(G), BNS 260-02/01Z(G)
When sensors with LED are wired in the control circuit
(protective circuit), the following rated operating voltage must
be observed and respected:
• 24 VDC with a max. tolerance of –5%/+20%
Otherwise availability problems could occur, especially in
series-wired sensors, where a voltage drop in the control
circuit is triggered by LED's for instance.
7.2 Application example
Dual-channel control, shown for guard door monitoring with
two position switches where one has a positive break contact;
with external reset button
• 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
• H2 = Feedback circuit
Signalling outputs must not be used in safety circuits.
6. Diagnostic
6.1 LED indications
LED
Function
Display type
RUN
Ready for operation
Continuously lit
Not a valid application
Flashes
In 1/2
Input S12 and S22 closed
Continuously lit
Time window for synchronicity exceeded Flashes quickly
1-channel opening
Flashes slowly
In 3/4
Input S32 and S42 closed
Continuously lit
Time window for synchronicity exceeded Flashes quickly
1-channel opening
Flashes slowly
Out 1
Safety output application 1 ON
Continuously lit
Safety outputs waiting for start (input X2) Flashes slowly
Feedback circuit not closed (input X3)
Flashes slowly
Out 2
Safety outputs application 2 ON
Continuously lit
No release signal on input X7
Flashes quickly
Safety outputs waiting for start (input X4) Flashes slowly
Feedback circuit not closed (input X5)
Flashes slowly
Single flashing of all LEDs with mains on
6.2 Malfunctions
Malfunctions and fault causes are displayed with the ERR-LEDs
via short and long flashing signals
LED Error cause
Long flash Short flash
ERR
Operating voltage too low
1
1
Operating voltage too high
1
2
Invalid rotary switch setting
1
3
External voltage on output Q1
1
5, 7, 9
External voltage on output Q2
1
2
6, 8
1
Termination to GND on output Q1
2
2
Termination to GND on output Q2
2
3
Cross-wire between inputs
S12 and S22
2
4
Cross-wire between inputs
S32 and S42
2
5
Undefined level on outputs:
X2
3
4
X3
3
5
X4
3
6
X5
3
7
X7
3
9
S12
2
9
S22
3
1
S32
3
2
S42
3
3
Rotary switch > 30 sec. to position C
6
8
Application changed
and activation of
operating voltage
LEDs flash quickly:
RUN, In 1/2, In 3/4,
Out 1, Out 2
Application was
changed during
active operation
LEDs flash quickly:
In 1/2, In 3/4,
Out 1, Out 2
Other fault codes:
Consult technical sales dept. at Schmersal
