Smart Positioner
YT-3700 / 3750
Product Manual
Ver. 1.03
91
8.12.9 PST Configuration (PST CFG)
Parameter names
Abbreviation [unit]
Description
PST Interval
INTERVAL [days]
Sets time interval PST is triggered. Initial factory setting
is 365 days.
PST Start Position
START PO [%]
Sets the start position to launch PST. Initial factory
setting is 100 %.
PST Tolerance
TOL [%]
The allowable tolerance for the start position.
PST
Failure
alarm
is
triggered
as
Out
of
Tolerance(OOT) when actual position exceeds the
tolerance. Initial setting is 5%.
PST Target Position TARGET [%]
Target position. Initial factory setting is 90%.
PST Hold Time
HOLD TM [sec]
Sets hold time after target position (±2%) is reached
Initial factory setting is 5 sec.
PST Limit Time
LIMT TM [sec]
PST Failure alarm is triggered as Limit Time Over (LTO)
when target position is not reached within LIMI TM after
starting PST. Initial factory setting is 10 sec.
PST Ramp up Rate
RAMP UP [%/sec] Sets ramp rate when the valve moves from the target
position to the start position. Initial factory setting is oFF.
PST Ramp down
Rate
RAMP dN [%/sec]
Sets ramp rate when the valve moves from the start
position to the target position. Initial factory setting is
oFF.
Remaing PST Time NEXT
PST[days.hrs]
Based on the current time, the remaining time to start
PST is displayed by Days and Time.
Graph below shows PST target position (TP) and actual position (AP) when applying PST Start
Position 100%, Target Position 90%, Hold Time 10 sec, PST Ramp up Rate 0.25%/sec, PST Ramp
down Rate 0.25%/sec.
Ramp down Rate
Hold Time
Hold Time
Dead Time
