YOKOGAWA UP55A - Time-Prioritized PV Start (STC=TIME)

9-13
IM 05P02C41-01EN
Program Pattern Functions
9
9.3.3 Time-prioritizedPVstart(STC=TIME)
Description
WithTime-prioritizedPVstarts,operationstartistriggeredbysegmenttime,whichsets
the time from the PV at program start to the target setpoint (TSP) of segment 1.
 CAUTION
Time-prioritizedPVstart(STC=TIME)cannotbeselectedwhenthesegmentsetting
method (SEG.T) is Segment ramp-rate (TM.RT.)
The segment ramps are determined by the segment time (TIME.)
The control program pattern will start at PV.
The retransmission program pattern will start at the SSP.
Ramprate=(Targetsetpoint(TSP)-PV)/Segmenttime
The start point of control program pattern will be a point a - e. Because the
retransmission program pattern will start at the same point as the control program pattern
does, it will start at SSP. Even though segment 2 is set to ramp, program operation starts
from segment 1.
TSP
TSP
SSP
SSP
a
b
c
d
e
Segment 1 Segment 2 Segment 3
Program pattern
for control
Program pattern
for retransmission
Program operation start (PRG)
Time
Setpoint
PV at start Operation-startingpointfor
control
Operation-startingpointfor
retransmission
a a SSP for retransmission
b b SSP for retransmission
c c SSP for retransmission
d d SSP for retransmission
e e SSP for retransmission
9.3SettingtheProgramStartingConditions(STC)