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MarkV Servo Range
How to check servo range from IO_CGF.LST File in MarkV?

Hi,

Is there a way to check from the IO_CFG.LST File to get the ranges of servo outputs?

I am not sure if my servo is +/-10 mA or +/- 120 mA?


TCQA Card Definition - Socket 1 - Screen 4/21

Regulator Definition for Servo Output 1

Function type & sub-type: 77
Valid types <00, 2D, 2E, 40, 41, 43, 49, 51, 52, 53, 77, 78, 7A, 7B, 7C>
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.) 1.93
Current Bias: (0 to 100% rated [10,20,40]) 2.9

Zero Stroke (0 to 6.667 Vrms) :- LVDT 1: 0.7827 LVDT 2: 0.707
100% Stroke (0 to 6.667 Vrms) :- LVDT 1: 2.992 LVDT 2: 3.003

<7> Pos limits (-128% to 128%) :- Low: -25.0 High: 100.0
<7> Integrator convergence gain (0 to 16 psi/%): 0.3
<7> Position reference Gain (0 to 2 %/psi): 0.2
Note: for type 5, enter fuel flow data on Pulse Rate screen.
for type 7, enter time constant data on screen #12.

Page 3 <Q> Card Socket Definitions Wed Apr 13 11:01:01 2011


TCQA Card Definition - Socket 1 - Screen 5/21

Regulator Definition for Servo Output 2

Function type & sub-type: 43
Valid types <00, 2D, 2E, 40, 41, 43, 49, 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.) 1.92
Current Bias: (0 to 100% rated [10,20,40]) 2.7
Note: For type 2D&2E: Position Bias (3.46 %) = 1.28 x Current Bias
Zero Stroke (0 to 6.667 Vrms) :- LVDT 1: 0.7316 LVDT 2: 0.7245
100% Stroke (0 to 6.667 Vrms) :- LVDT 1: 3.58 LVDT 2: 3.0

<6> Pos limits (-128% to 128%) :- Low: -5.0 High: 100.0
<6> Integrator convergence gain (0 to 1 %/%): 0.3
<6,2> Position reference Gain (0 to 32 %/%): 0.309
<6,2> Position ref time constant (0 to 8 Sec) : 1.0
Note: for type 5 & 6, enter fuel flow data on Pulse Rate screen.

2 out of 2 members thought this post was helpful...

sid100,

The I/O Configurator is used for configuring the software regulators of servo-valve outputs (gains; offsets; biases; regulator type; etc.). The software regulator doesn't care what the milliamp range of the servo coil connected to an output is.

HOWEVER, the TCQC card DOES care what the milliamp range of the servo coil connected to an output is. And, there are hardware ("Berg") jumpers which have to be set to match the servo's milliamp range in order for the output to function properly (for each of the control processors).

I searched the available documentation for the Mark V, and really the only place it is written (that I could find--in GEH-6195D) is in Section 6-10. There is a table and in the 'Comments' section of the table in Section 6-10 it is written: "-10 to +10 mA, 0 to 20 mA, 0 to 40 mA, or 0 - 200 mA selected by jumpers".

(And I'm presuming you are referring to the eight (8) servo-valve outputs of <R>, <S> and <T> (or <R> in a SIMPLEX panel). In a heavy duty gas turbine panel there are some optional "servo" outputs available, but I think they are +/- 10 mA only, and are not jumper selectable. (But I may be wrong about that.)

Hope this helps! In general, GE heavy duty gas turbines only used +/- 10 mA servos. Some steam turbine applications used servos with other ranges, but not usually gas turbines.

1 out of 1 members thought this post was helpful...

Review the application manual GEH-6195. If you don't have one, it can be found doing a quick internet search.

Look in sections 6 or 7. One of those two sections should tell what you are looking for. It has to do with the hardware jumpers on one of the boards. I think it is the TCQC board but am not for certain. Also look in the appendix A. That will have the info on what the jumper setting mean.

Hope this was helpful.