YOKOGAWA UTAdvanced UP55A, User Manual

Page: 234 / 516

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)