WESTINGHOUSE 1C31116G04

Description

WESTINGHOUSE 1C31116G04
Page 22-2, Add the following information after the second paragraph (The dual-channel…sequence.)
in Section 22-2 (Operation):
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).