Samson 3730 Series Operating Instructions

EB 8389-1S EN 29
Valve signature
− 'Detected lower spring range value': Sig-
nal pressure p
out
when the actuator is
lled with the minimum amount of air
− 'Detected upper spring range value': Sig-
nal pressure p
out
when the actuator is
lled with the maximum amount of air
The 'Valve signature canceled' message is
generated if the test is canceled.
Start-up > Initialization result
− Valve signature canceled (Code 81):
, , ,
The 'Test status' reading indicates the reason
why the test was canceled:
− No supply pressure: The supply pressure
was under 500mbar during the test.
− Valve moved too quickly. Recommended
action: Increase sensitivity
− Position at p
max
not reached (lling with
air):
(1) Even though the pressure was in-
creased in steps from 0bar to the maxi-
mum amount of air for lling the actua-
tor, the valve was not able to reach the
maximum position in closed-loop opera-
tion.
(2) The minimum valve position without
tight-closing is below 96%.
Recommended action: Increase supply
pressure.
− Position at p
min
not reached (venting):
(1) Even though the pressure was re-
duced in steps from the maximum
amount of air for lling the actuator, the
valve was not able to reach the minimum
position in closed-loop operation. The
valve might be jammed.
(2) The minimum valve position without
tight-closing is above 4%.
− Time-out
− Double-acting actuator
− Internal error
− Current too low
− Internal solenoid valve/forced venting
triggered
− SUB initialization
4.2 Valve signature, signal
pressure(x)
The positioner records the data for lling and
venting the actuator during closed-loop op-
eration. The recorded data can be directly
compared with the reference graph. Addi-
tionally, the minimum, maximum and current
supply pressure are shown in the graph.
Data are recorded in the background re-
gardless of the operating mode selected if a
reference graph has already been plotted.
Data logging does not need to be activated.
Note:
The positioner determines the mini-
mum and maximum supply pressure
while plotting the reference graph. The
current supply pressure may fall below
the minimum supply pressure and ex-
ceed the maximum supply pressure.
Dening parameters
1. Record reference graph. u Section 4.2.


Samson 3730 Series Specifications

General

Brand	Samson
Model	3730 Series
Category	Valve Positioners
Language	English