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Translation of the original instructions
BA000528 - 09/2013 (Rev. E)
SNV 4274SL / -A / -C
Safety regulations
The installation, commissioning, modification
and retrofitting must only be performed by a
qualified electrician!
Disconnect the device / the system from the
power supply before starting work! In the case
of installation and system errors, mains voltage
can be present on the control circuit in the case
of non-galvanically isolated devices!
Observe the electrotechnical and professional
trade association safety regulations for the
installation of the equipment.
Opening the case or other manipulation voids
any warranty.
Attention!
In the case of improper use or any use other
than for the intended purpose, the device must
no longer be used and any warranty claim is
void. Invalidating causes can be:
strong mechanical loading of the device such
as, e.g. in the case of falling or voltages,
currents, temperatures, humidity outside the
specification.
Please always check all safety functions in
accordance with the applicable regulations
during initial commissioning of your machine /
system and observe the specified inspection
cycles for safety devices.
Attention!
Take the following safety precautions before
starting installation / assembly or dismantling:
1.
Disconnect the device / the system from
the power supply before starting work!
2.
Secure the machine / system against being
switched on again!
3.
Confirm that no voltage is present!
4.
Ground the phases and short to ground
briefly!
5.
Cover and shield neighbouring live parts!
6.
The devices must be installed in a switch
cabinet with a protection class of at least
IP 54.
Attention!
Limited contact protection! Degree of protection
according to DIN EN 60529.
Case/terminals: IP 40 / IP 20.
Finger-proof according to DIN VDE 0660 Part 514.
4
Basic device with release delay (OFF delay) for EMERGENCY STOP and safety door
applications
Basic device according to EN 60204-1:2005 and EN ISO 13849-1:2008 for single or two-
channel EMERGENCY STOP monitoring.
PL e / category 4 in accordance with EN ISO 13849-1:2008
SIL CL 3 according to DIN EN 62061:2005
Stop Category 0 and 1 according to DIN EN 60204-1
Manual or automatic start with monitoring of the feedback loop of external contactors
With or without crossover detection
2 not delayed and 2 delayed enabling current paths, positively driven NO (normally open)
contacts
Analogue adjustable OFF delay with separate control inputs for the post-trigger function and
the premature ending of the OFF delay
For processing signals from output signal switching devices (OSSD) of a light grid according
to DIN EN 61496-1
Use in combustion plants according to EN 50156-1:2005 SNS 3
Power supply 24 V DC or 115-230 V AC
Device versions
SNV 4274SL: 0.15-3s / 1.5-30s / 15-300s
SNV 4274SL-A: 0.15-3s / 1.5-30s / 15-300s
SNV 4274SL-C: 0.15-3s / 1.5-30s / 15-300s
Device and function description
SNV 4274SL The SNV 4274SL is an electronic, redundant and self-monitoring safety switching
device for EMERGENCY STOP equipment according to DIN EN 60204-1 with positively driven
relays.
Basic function: After applying the supply voltage to the terminals A1/A2 and closed safety
circuits, the enabling current paths are closed when a reset signal is established. The enabling
current paths are opened when the safety circuits are opened/de-energised.
Operating modes / System functions
Single or two-channel actuation In the case of single-channel actuation, both the safety
circuits CH1 and CH2 are connected in parallel and are separated for two-channel actuation
(see Installation 1 to 4).
Without crossover detection Both safety circuits are connected to positive potential (see
Installation 2).
With crossover detection The safety circuit CH1 is connected to negative potential and the
safety circuit CH2 to positive potential (see Installation 3).
Reset function without starting lockout When the safety inputs and feedback circuits are
closed, the relays are activated by pressing a Reset button connected between S13 and S14.
The input S14 is not monitored for continuous actuation (see Installation 6).
Reset function without starting lockout The reset input S14 is connected to S13. In the case
of closed feedback circuits, the relays activate with the closing of the safety circuits (see
Installation 5).
OSSD compatible Output signal switching devices (OSSD) of a light barrier or other safety
sensors with semiconductor outputs can be processed. Test pulses which are < t
influence the device functions. Test pulses > t
Installation 4).
Release delay (OFF delay) The OFF-delayed part (K3/K4) switches off after opening the
safety circuits according to the specified delay time. It is possible to clear the release delay
with the post-trigger function.
Set-Time The set time is applied with the falling edge on Y42 and saved. During the saving
process, the outputs are deactivated and are set afterwards according to the input statuses.
Modification of the time setting does not influence the delay time as the stored time is used,
Any difference between the set time and the stored time is indicated using the FLT LED (see
Installation 7).
Time-Clear Premature ending of the OFF delay. If the connection Y39/Y40 is opened during
the time delay, the OFF delay is ended immediately and the relays K3/K4 switch off (see
Installation 8).
Post-trigger During the delay time, the relays K1/K2 can be activated again by a reset at S14
and the release delay cleared, i.e. the relays K3/K4 remain activated.
Feedback circuit The feedback circuit of the not delayed part must be connected in the reset
circuit S13/14 and the feedback circuit of the delayed part must be connected between
S13/Y2 (see Installations 5 and 6).
Discrepancy time Within this time, both the input signals of the safety circuits can have
different states without this resulting in the relays switching off.
Please also observe the information from your professional trade association!
with fixed screw clamp terminals
with pluggable screw clamp terminals
with pluggable spring-loaded terminals
can result in deactivation of the relays (see
TP
do not
TP
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