© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
90
|
BHGE
Table 13 outlines some effects of parameter changes.
Step Two
Run autotune again after ensuring the:
Other Issues That Affect Autotune
Valve oscillating fast:
P
term too high: reduce
P
by ½ and try again
Booster too hot (aggressive) open by-pass on booster and try again
Valve oscillation slow - friction:
Increase
I
term by 20-25%
Add
Dead Zone
– try 0.25%
Valve moves too slowly:
P
term too low, try increasing by 25%
Stroking time set to non-zero value.
Table 13
Rough Guide to Effect s of Changing PID Values
Parameter
Rise Time
Overshoot
Settling Time
Increase Value
Decrease Value
Increase Value
Decrease Value
Increase Value
Decrease Value
P
Decrease
Increase
Increase
Decrease
Small Effect
Small Effect
I
Small Effect
Small Effect
Decrease
Increase
Decrease
Increase
D
Small Effect
Small Effect
Decrease
Increase
Decrease
Increase
Air supply is sufficient and there are no air leaks.
Valve does not have excessive friction.
Add some
Dead Zone
(0.25).
Linkage is not loose or in an improper position.
Mounting is installed correctly.
Alarms are cleared.
Magnet is not out of position.
Boosters are not too aggressive.
Solenoid in supply line should have a Cv that is
.25 or higher (Std Capacity SVI II AP).
Summary of Contents for Masoneilan SVIII AP
Page 10: ...This page intentionally left blank...
Page 14: ...This page intentionally left blank...
Page 18: ...This page intentionally left blank...
Page 58: ...This page intentionally left blank...
Page 68: ...This page intentionally left blank...
Page 104: ...This page intentionally left blank...
Page 122: ...This page intentionally left blank...
Page 128: ...This page intentionally left blank...
Page 148: ...This page intentionally left blank...
Page 158: ...2017 Baker Hughes a GE company LLC All rights reserved 158 BHGE Spare Parts...
Page 160: ...2017 Baker Hughes a GE company LLC All rights reserved 160 BHGE...
Page 162: ...This page intentionally left blank...
Page 166: ...This page intentionally left blank...
Page 172: ...This page intentionally left blank...
Page 174: ...This page intentionally left blank...
Page 176: ...This page intentionally left blank...
Page 180: ...This page intentionally left blank...
Page 188: ...This page intentionally left blank...
Page 190: ...This page intentionally left blank...
Page 203: ......