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Control valve feedback (3rd lvdt defined in rgulator 8(type00) lvdt 15) is showing 00 (constant) in logic forcing but showing actual value in diagnostic counters. Control system is MARK V with TMR configuration.
Our steam turbine is controlled through Mark V with TMR configuration. For one of the control valves in our steam turbine there are three LVDT feedbacks defined as LVDT 3, lvdt 4 and lvdt 15.
Lvdt 3 and 4 are defined in regulator 2. the tcqa definition is given below for these feedbacks. now 3rd position defined in LVDT 15 (regulator 8 type 00) is showing 0 value always in Logic Forcing Screen but in diagnostic counters it is showing actual value as per the valve opening. for lvdt 3&4 the value is matching in logic forcing as well as in diagnostic counters. I would like to know how i can get actual value for lvdt 15 in logic forcing.
TCQA Card Definition - Socket 1 - Screen 5/21
Regulator Definition for Servo Output 2
Function type & sub-type: 49
Valid types <00, 2D, 2E, 40, 41, 43, 49, 51, 52, 53, 64, 65, 66>
Suicide enable :-
Current Fault: YES
LVDT/R fault: YES
Suicide position limits (%):: Low: -5.0 High: 105.0
Current Gain: (0 to 200% rated_cur./%pos.) 20.0
Current Bias: (0 to 100% rated [10,20,40]) 3.0
Note: For type 2D&2E: Position Bias (3.84 %) = 1.28 x Current Bias
Zero Stroke (0 to 6.667 Vrms) :-
LVDT 1: 1.6531
LVDT 2: 1.65 100% Stroke (0 to 6.667 Vrms) :-
LVDT 1: 4.406 LVDT 2: 4.386
<6> Pos limits (-128% to 128%) :- Low: 0.0 High: 0.0
<6> Integrator convergence gain (0 to 1 %/%): 0.0
<6,2> Position reference Gain (0 to 32 %/%): 0.0
<6,2> Position ref time constant (0 to 8 Sec) : 0.0
Note: for type 5 & 6, enter fuel flow data on Pulse Rate screen.
TCQA Card Definition - Socket 1 - Screen 11/21
Regulator Definition for Servo Output 8
Function type & sub-type: 00
Valid types <00, 40, 41, 43, 51, 52, 53, 64, 65, 66>
Suicide enable :- Current Fault: NO LVDT/R fault: NO
Suicide position limits (%):: Low: -5.0 High: 105.0
Current Gain: (0 to 200% rated_cur./%pos.) 0.0
Current Bias: (0 to 100% rated [10,20,40]) 0.0
Zero Stroke (0 to 6.667 Vrms) :- LVDT 1: 1.6559 LVDT 2: 2.0531
100% Stroke (0 to 6.667 Vrms) :- LVDT 1: 4.39 LVDT 2: 4.826
<6> Pos limits (-128% to 128%) :- Low: 0.0 High: 0.0
<6> Integrator convergence gain (0 to 1 %/%): 0.0
<6> Position reference Gain (0 to 32 %/%): 0.0
<6> Position ref time constant (0 to 8 Sec) : 0.0
Note: for type 5 & 6, enter fuel flow data on Pulse Rate screen.
Our steam turbine is controlled through Mark V with TMR configuration. For one of the control valves in our steam turbine there are three LVDT feedbacks defined as LVDT 3, lvdt 4 and lvdt 15.
Lvdt 3 and 4 are defined in regulator 2. the tcqa definition is given below for these feedbacks. now 3rd position defined in LVDT 15 (regulator 8 type 00) is showing 0 value always in Logic Forcing Screen but in diagnostic counters it is showing actual value as per the valve opening. for lvdt 3&4 the value is matching in logic forcing as well as in diagnostic counters. I would like to know how i can get actual value for lvdt 15 in logic forcing.
TCQA Card Definition - Socket 1 - Screen 5/21
Regulator Definition for Servo Output 2
Function type & sub-type: 49
Valid types <00, 2D, 2E, 40, 41, 43, 49, 51, 52, 53, 64, 65, 66>
Suicide enable :-
Current Fault: YES
LVDT/R fault: YES
Suicide position limits (%):: Low: -5.0 High: 105.0
Current Gain: (0 to 200% rated_cur./%pos.) 20.0
Current Bias: (0 to 100% rated [10,20,40]) 3.0
Note: For type 2D&2E: Position Bias (3.84 %) = 1.28 x Current Bias
Zero Stroke (0 to 6.667 Vrms) :-
LVDT 1: 1.6531
LVDT 2: 1.65 100% Stroke (0 to 6.667 Vrms) :-
LVDT 1: 4.406 LVDT 2: 4.386
<6> Pos limits (-128% to 128%) :- Low: 0.0 High: 0.0
<6> Integrator convergence gain (0 to 1 %/%): 0.0
<6,2> Position reference Gain (0 to 32 %/%): 0.0
<6,2> Position ref time constant (0 to 8 Sec) : 0.0
Note: for type 5 & 6, enter fuel flow data on Pulse Rate screen.
TCQA Card Definition - Socket 1 - Screen 11/21
Regulator Definition for Servo Output 8
Function type & sub-type: 00
Valid types <00, 40, 41, 43, 51, 52, 53, 64, 65, 66>
Suicide enable :- Current Fault: NO LVDT/R fault: NO
Suicide position limits (%):: Low: -5.0 High: 105.0
Current Gain: (0 to 200% rated_cur./%pos.) 0.0
Current Bias: (0 to 100% rated [10,20,40]) 0.0
Zero Stroke (0 to 6.667 Vrms) :- LVDT 1: 1.6559 LVDT 2: 2.0531
100% Stroke (0 to 6.667 Vrms) :- LVDT 1: 4.39 LVDT 2: 4.826
<6> Pos limits (-128% to 128%) :- Low: 0.0 High: 0.0
<6> Integrator convergence gain (0 to 1 %/%): 0.0
<6> Position reference Gain (0 to 32 %/%): 0.0
<6> Position ref time constant (0 to 8 Sec) : 0.0
Note: for type 5 & 6, enter fuel flow data on Pulse Rate screen.