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In order to understand the control system of GE-design heavy duty gas turbine, I'm starting to learn how to read Control Specification. Can someone please explain how RPM is converted to counts in the following control specification sheet? And what values Mark VI will use for calculation in various algorithms?
<b>Moderator's note:</b> scroll down to see table.<pre>
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02.01.03 SPEED SIGNAL: HP TURBINE (PERCENT)
ALGORITHM: PR_MEAS TNH ELEM SH: 42M
THE TNH_PR SIGNAL IS RESCALED TO PERCENT OF RUNNING SPEED AT LINE FREQUENCY,
THE GOVERNOR SPEED, TNH.5728, B15
(ADJUST TNKH2 FOR 26214, B15 AT LINE FREQUENCY)
SPEED %SPEED COUNTS CONSTANT NAME
5106* 100 26214, B15 TNKH2
6381 125 32767, B15 TNKH3
26214*(2**TNKH3) 9000
*NOTE: TNKH2= ---------------------
RATED TURBINE SPEED (WHERE: SPEED = RPM)
___________________________________________________________________________________
CONSTANT K VALUE UNITS DESCRIPTION
TNKH2 K 11551 CNT 15
TNKH3 K -2 CNT 15</pre>
<b>Moderator's note:</b> scroll down to see table.<pre>
_________________________________________________________________________________
02.01.03 SPEED SIGNAL: HP TURBINE (PERCENT)
ALGORITHM: PR_MEAS TNH ELEM SH: 42M
THE TNH_PR SIGNAL IS RESCALED TO PERCENT OF RUNNING SPEED AT LINE FREQUENCY,
THE GOVERNOR SPEED, TNH.5728, B15
(ADJUST TNKH2 FOR 26214, B15 AT LINE FREQUENCY)
SPEED %SPEED COUNTS CONSTANT NAME
5106* 100 26214, B15 TNKH2
6381 125 32767, B15 TNKH3
26214*(2**TNKH3) 9000
*NOTE: TNKH2= ---------------------
RATED TURBINE SPEED (WHERE: SPEED = RPM)
___________________________________________________________________________________
CONSTANT K VALUE UNITS DESCRIPTION
TNKH2 K 11551 CNT 15
TNKH3 K -2 CNT 15</pre>