Westinghouse 1C31147G01 modular

Westinghouse 1C31147G01

Starting with revision 0C, RSR firmware supports a cascaded PI configuration in which the

output of PI 1 is used as the target position input for PI 2. Additional features to support

cascading operation are flags to select direct/indirect PI operation, and an anti-windup

feature called “retreat”. Some of these new features are actually independent of cascading,

but all are described in detail in this document.

Page 22-9, Delete all of the remaining paragraphs (six) after the second paragraph (Arbitrary

limits...10.0 volts.) in the Full Calibration bullet under the Calibrate Mode Section:

Page 22-9, Add the following information in place of the deleted paragraphs in above item:

When full calibration is requested, the valve first travels to 0%. At 0%,demodulator gain is

adjusted until the feedback voltage is near 10 volts. The demodulator gain at this point is

the maximum possible demodulator gain.

Then the valve travels to 100%. If the voltage is greater than 10 volts, or off-scale,

demodulator gain is reduced, and a reading of the voltage is taken. This reading is the

100% calibration valve.

Then the valve travels to 0% and a voltage reading is taken. This reading is the 0%

calibration value.

After the 0% calibration valve is determined, the new values are written to EE memory.

Page 22-17, Under Section 22-8 (Valve Position Control), replace the Section “Seating and

Backseating” with the following:

22-8.1 SEATING, BACKSEATING, AND RETREAT

Seating and BackSeating are similar functions, with the exception that Seating closes the

valve, and BackSeating opens it. Therefore, only Seating is described.

Retreat is an anti-windup function. It is important to remember that when the RSR servo

output is near 0 volts, the valve is stationary. When the servo output moves away from the

midpoint, the valve moves to the desired position, and the servo output goes back to near

0 volts.

Retreat is a feature that occurs after Seating. It is highly programmable.

When the target position is less than seatLimit, the RSR goes into a seating mode. In this

mode the RSR wants to close the valve as fast as possible. It accomplishes this by driving

the output hard to the rail in the direction of valve closure.

Retreat occurs after a timer has expired (retreatHoldT), and once the valve position is close

to where the RSR wants it to be (ABS|Target-Feedback| < posErrorRetreat). When a valve

retreats, the servo output goes from the rail to a programmed value (exitSeatVal) at a

predefined rate (retreatRate).

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Packaging and Handling

Item security ESD is packaged in custom shipping cartons for protection.

shipping

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PR6423/003-030+CONO21

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PR6423/00R-010

PR6424/010-010+CON021

PR6426/010-120

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MMS6110

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