88
EB 8389-1S EN
SIL operator test
Fig. 21:
Electrical connections
Switching amplifier according to
EN 60947-5-6
24 V DC
Forced
venting/
solenoid valve
(optional)
mA
control
signal
A3 Fault
alarm
output
A2
Software
A1
Software
optionally
inductive
Limit switches
Two-wire
transmitter
Supply unit
only for
optional
transmitter
Leakage
sensor
Binary input
Optional
Optional
Optional
Optional
G
+81 -82
+11 -12
+83 -84
+51 -52
A2
A3
A1
+41 -42
+31 -32
A
+31 -32
G
+31 -32
G
+81 -82
+11 -12
+83 -84
+51 -52
A2
A3
A1
+41 -42
+31 -32
A
+31 -32
G
+31 -32
14
SIL operator test
The SIL operator ensures that the safety func-
tion of the positioner is working. The safety
function is based on the shutdown of the i/p
converter (6, Fig. 22). This causes the pneu-
matic actuator to be vented and the valve to
move to its fail-safe position.
Monitoring of the input signal
The i/p converter is switched off when the
input signal of the positioner at terminals
+11/
–12 falls below 3.8 mA or 4.4 mA depend
-
ing on the positioner version (a signal range
of 4 to 20 mA is required). See Fig. 21.
Monitoring the voltage supply
(version with forced venting and solenoid
valve)
The i/p converter and the solenoid valve
(when installed) are shut down whenever the
voltage at ter81/–82 falls below
12 V (an input voltage of 24 V DC is re
-
quired). See Fig. 21.
The SIL operator test checks the emergency
shutdown by the integrated safety function
(SIL). It can be started in the manual or auto-
matic mode of control valves.
The positioner generates a permanent mes-
sage in the event that an error occurs during
the operator test. All control properties of the
positioner remain kept. Only the emergency
shutdown function of the positioner is no lon-
ger guaranteed.
