Manual 35018V1
505XT Digital Control System for Steam Turbines
Woodward
126
IDLE 2 DELAY TIME—HOT (MINUTES)
dflt= 1.0 (0.0, 500)
Enter the hot start hold time desired at Idle 2. This is the programmable time, in minutes, that the
turbine will wait/hold at the Idle 2 speed when a hot start is determined. If the turbine has been
shutdown for longer than the Hot time but shorter than the Cold time, the control will interpolate
between the Hot and Cold delays to determine the hi idle hold time.
Use IDLE 3?
dflt= False
When TRUE, the speed reference will ramp to Idle 3 level when timer is passed.
When FALSE is selected, the speed reference will go to RATED speed.
RATE TO IDLE 3—COLD (rpm/s)
dflt= 5.0 (0.01, 500)
Enter the cold start rate to Idle 3. This is the programmable rate, in rpm per second, that the speed
set point will accelerate at when moving to high idle when a cold start is determined.
RATE TO IDLE 3—WARM (rpm/s)
dflt= 5.0 (0.01, 500)
Enter the warm start rate to Idle 3. This is the programmable rate, in rpm per second, that the speed
set point will accelerate at when moving to high idle when a warm start is determined. The warm
condition is only available when using temperature analog inputs.
RATE TO IDLE 3—HOT (rpm/s)
dflt= 5.0 (0.01, 500)
Enter the hot start rate to Idle 3. This is the programmable rate, in rpm per second, that the speed
set point will accelerate at when moving to Idle 3 when a hot start is determined. If the turbine has
been shutdown for longer than the Hot time but shorter than the Cold time, the control will interpolate
between the Hot and Cold rates to determine the acceleration rate to the Idle 3 set point.
IDLE 3 SETPT (rpm)
dflt= 1200 (0.0, 20000)
Enter the Idle 3 Speed Setting. This is the third hold speed when using the automatic start sequence.
The speed set point will remain at this setting until the Idle 3 Delay/hold time has expired.
(Must be greater than the ‘ Idle 2’ Setting)
IDLE 3 DELAY TIME—COLD (MINUTES)
dflt= 1.0 (0.0, 500)
Enter the cold start hold time desired at Idle 3. This is the programmable time, in minutes, that the
turbine will wait/hold at the Idle 3 speed when a cold start is determined.
IDLE 3 DELAY TIME—WARM (MINUTES)
dflt= 1.0 (0.0, 500)
Enter the warm start hold time desired at Idle 3. This is the programmable time, in minutes, that the
turbine will wait/hold at the Idle 3 speed when a warm start is determined. The warm condition is only
available when using temperature analog inputs.
IDLE 3 DELAY TIME—HOT (MINUTES)
dflt= 1.0 (0.0, 500)
Enter the hot start hold time desired at Idle 3. This is the programmable time, in minutes, that the
turbine will wait/hold at the Idle 3 speed when a hot start is determined. If the turbine has been
shutdown for longer than the Hot time but shorter than the Cold time, the control will interpolate
between the Hot and Cold delays to determine the Idle 3 hold time.
USE TEMPERATURE FOR IDLES
dflt= NO (Yes/No)
If this function is selected, it allows the temperature analog inputs to be used to determine when the
automatic start sequence can proceed from an idle setpoint. If not selected, only idle timers and
halt/continue commands will be used.
USE TEMPERATURE INPUT 2
dflt= NO (Yes/No)
If this function is selected, it allows 2 temperature analog inputs to be used to determine when the
automatic start sequence can proceed from an idle setpoint. To use the temperature difference
feature, Temperature Input 2 must be used. If not selected, only 1 temperature AI will be used.
USE TEMPERATURE DIFFERENCE
dflt= NO (Yes/No)
If this function is selected, it allows the difference between temperature analog inputs 1 and 2 to be
used to determine when the automatic start sequence can proceed from an idle setpoint. Two
temperature inputs must be configured. If not selected, idle hold conditions will be based on the
value of each temperature analog input and not the difference between the two.
TEMPERATURE 1 SETPOINT FOR IDLE 1
dflt= 1500.0 (0.0, 1.0e+38)
Set the temperature that must be reached for the automatic start sequence to continue through the
Idle 1 speed setpoint based on temperature analog input 1. Above this temperature, the Idle 1
condition will be satisfied for this temperature input. See the functional description in this manual for
other conditions that may be required for the automatic start sequence to continue from Idle 1.
TEMPERATURE 2 SETPOINT FOR IDLE 1
dflt= 1500.0 (0.0, 1.0e+38)
Set the temperature that must be reached for the automatic start sequence to continue through the
Idle 1 speed setpoint based on temperature analog input 2. Above this temperature, the Idle 1
condition will be satisfied for this temperature input. See the functional description in this manual for
other conditions that may be required for the automatic start sequence to continue from Idle 1.