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If the interval between signal inputs 1 and 2 is longer than the synchronization
time for monitoring, the AS3-SV safety valve remains in the non-activated state.
In this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line and
OUT LED is not illuminated. The IN 1 LED and IN 2 LED flash fast and indicate that
signal inputs 1 and 2 have not been actuated synchronously.
If signal input 1 and/or signal input 2 is actuated with 0 at time 3, the AS3-SV
safety valve goes into the non-activated state (AS3-SOV=0) and exhausts the op-
erating line. OUT LED is off. Signal inputs 1 and 2 must be on 0 to re-pressurize.
The IN 1 and IN 2 LEDs are off in this state.
8.2.5 Signal sequence for NCNC control
The following signal sequence results during NCNC control of the AS3-SV safety
valve (see Fig. 13).
The AS3-SV safety valve is in the ready state before time 1, but is not activated. In
this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line.
Signal input S22 is connected with clock output S21 at time 1 via the switch. If
signal input S12 is connected with clock output S11 via the second switch within
synchronization time (6), the AS3-SV safety valve goes into the "wait for start"
state at time 2. The AS3-SV safety valve remains in non-actived state (AS3-SV=0)
and exhausts the operating line. The OUT LED indicates this state by flashing
slowly.
The synchronization time for monitoring the signal inputs is 0.5 s. The state of
signal inputs 1 and 2 is displayed by the IN 1 LED and IN 2 LED.
If the interval between signal inputs 1 and 2 is longer than the synchronization
time for monitoring, the AS3-SV safety valve remains in the non-activated state.
In this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line and
OUT LED is not illuminated. The IN 1 LED and IN 2 LED flash fast and indicate that
signal inputs 1 and 2 have not been actuated synchronously.
If start signal X2 is changed from 0 V to 24 V (positive flank) at time 3 and is
changed back from 24 V to 0 V (negative flank) at time 4, the AS3-SV safety goes
into the pressurized state (AS3-SV=1) at time 4. OUT LED illuminates and indi-
cates the activated state. The time for monitoring signal X2 is between a mini-
mum of 0.03 s and maximum 3 s. If X2 is not actuated within this monitoring
time, the AS3-SV safety valve remains in the exhausted state (AS3-SV=0). If the
connection between S11 and S12 or between S21 and S22 is interrupted via the
corresponding switch after time 4, the AS3-SV safety valve goes into the non-ac-
tivated state (AS3-SOV=0) and exhausts the operating line at time 5. OUT LED is
off. Both signal inputs 1 and 2 must be open/interrupted to re-pressurize. The
IN 1 and IN 2 LEDs are off in this state.
8.2.6 Signal sequence for NCNO control
The following signal sequence results during NCNO control of the AS3-SV safety
valve (see Fig. 14).
The AS3-SV safety valve is in the ready state before time 1, but is not activated. In
this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line.
The switch opens the connection between signal input S22 and clock output S21
at time 1. If signal input S12 is connected with clock output S11 via the second
switch within synchronization time (6), the AS3-SV safety valve goes into the
"wait for start" state at time 2. The AS3-SV safety valve remains in the non-acti-
vated state (AS3-SV=0) and the exhausts the operating line. OUT LED indicates
this state by flashing slow.
The synchronization time for monitoring the signal inputs is 0.5 s. The state of
signal inputs 1 and 2 is displayed by the IN 1 LED and IN 2 LED.
If the interval between signal inputs 1 and 2 is longer than the synchronization
time for monitoring, the AS3-SV safety valve remains in the non-activated state.
In this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line and
OUT LED is not illuminated. The IN 1 LED and IN 2 LED flash fast and indicate that
signal inputs 1 and 2 have not been actuated synchronously.
If start signal X2 is changed from 0 V to 24 V (positive flank) at time 3 and is
changed back from 24 V to 0 V (negative flank) at time 4, the AS3-SV safety goes
into the pressurized state (AS3-SV=1) at time 4. OUT LED illuminates and indi-
cates the activated state. The time for monitoring signal X2 is between a mini-
mum of 0.03 s and maximum 3 s. If X2 is not actuated within this monitoring
time, the AS3-SV safety valve remains in the exhausted state (AS3-SV=0).
If the connection between S11 and S12 is opened via the corresponding switch
after time 4 or the connection between S21 and S22 is closed by the correspond-
ing switch, the AS3-SV safety valve goes into the non-activated state (AS3-
SOV=0) and exhausts the operating line at time 5. OUT LED is off. Both signal in-
puts 1 and 2 must be open/closed to re-pressurize. LED IN 1 and IN 2 are off in
this state.
AVENTICS™ AS3-SV | R412026750-BAL-001-AE | English
8.2.7 Signal sequence for PM control
The following signal sequence results during PM control of the AS3-SV safety
valve (see Fig. 15).
The AS3-SV safety valve is in the ready state but is not activated before time 1. In
this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line.
Signal input M is actuated with 0 V at time 1. If signal input P is actuated with
24 V within synchronization time (4), the AS3-SV safety valve goes into pressur-
ized state (AS3-SV=1) at time 2. The OUT LED lights up and indicates the acti-
vated state.
The synchronization time for monitoring (4) is 0.5 s. The state of signal inputs P
and M is displayed by the IN 1 LED and IN 2 LED.
If the interval between signal inputs P and M is longer than the synchronization
time for monitoring, the AS3-SV safety valve remains in the non-activated state.
In this state (AS3-SV=0) the AS3-SV safety valve exhausts the operating line and
OUT LED is not illuminated. The IN 1 LED and IN 2 LED flash fast and indicate that
signal inputs 1 and 2 have not been actuated synchronously.
If signal input P is not actuated with 24 V or if signal input M is not actuated
with 0 at time 3, the AS3-SV safety valve goes into the non-activated state (AS3-
SV=0) and exhausts the operating line. OUT LED is off.
The signal input must be at 0 V and signal input M not at 0 V to re-pressurize. The
IN 1 and IN 2 LEDs are off in this state.
8.2.8 Signal sequence when a fault occurs
The AS3-SV safety valve goes into the safe state if a fault occurs during operation
of the AS3-SV safety valve. Exhausting of the operating line is the safe state. If a
fault occurs:
• the AS3-SV safety valve exhausts the operating line
• opens the signal output
• the red LED shows a flash code for the fault.
The following signal sequence results when a fault occurs (see Fig. 16).
The device works fault-free at time 1. The signal output (41, 42=0) opens at
time 2 if a fault (3) occurs. The ERR LED shows a fault number via a flash consist-
ing of long and short sequences. You can analyze the error with the help of this
error number. The device is switched off at time 4 and the fault is rectified. If the
device is switched on at time 5 and the fault has been rectified, the device is
ready to operate again at time 6 after the self-test (7, approx. 1.5 s).
The following table shows an overview of flash codes with the corresponding
cause of fault.
LED
Flashes
Flashes short Error cause
long
ERR
1
1
1
2
2
4
4
3
3
8
4
2
3
9
4
1
3
4
2
9
3
1
3
6
8.2.9 LED displays
The LEDs flash briefly if the AS3-SV safety valve is supplied with 24 V.
The normal non-activated operating state (exhaust) is:
• RUN: illuminated
• IN 1, IN 2, OUT, ERR: off
The normal activated operating state (pressurize) is:
• RUN, IN 1, IN 2, OUT: illuminated
• ERR: off
The following table shows an overview of LED displays with the corresponding
function.
Supply voltage too low
Supply voltage too low
Cross-circuit between inputs S12 and S22
Supply voltage is detected as an AC voltage
Time monitoring during pressurization
Time monitoring during exhaust
Time monitoring during exhaust
Time monitoring during exhaust
Undefined level on input X2
Undefined level on input S12
Undefined level on input S22
Time monitoring during pressurization
24
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