5X00622G01 Real time quotation of GE power card controller communication card

Description

During the 5X00622G01 calibration sequence, observe the valve to ensure it is moving, and that

it is moving in the proper direction. Also, review the calibration constants and

compare them with the ideal setup described below:

• The range of calibration values corresponds to the hexadecimal range of the AD

converter, and is presented to the user in decimal, 5X00622G01 ranging from -31768 to

• When an LVDT is properly adjusted and calibrated, the calibration constants

(0% and 100%) will be equal in amplitude and opposite in sign. The amplitudes

for this ideal setup would be approximately 30000. This result suggests the

following:

— The LVDT is adjusted so that its electrical null point (where secondary A

amplitude = secondary B) matches the 5X00622G01 midpoint of the mechanical stroke.

— The programmable gain amplififier on the demodulator is adjusted so that the

electrical “stroke” stays within the input range of the AD converter. Thus,

the valve positioner can detect incremental movement for all valve

positions.

— If thermal expansion occurs, the valve positioner will continue to detect

incremental movement because the calibration is not to the extreme end of

the AD converter range, and because the magnitude of thermal expansion is

small.

Rolled servo wires can 5X00622G01 cause the valve to move in the opposite direction. Be sure to

observe and verify the correct movement of the valve. If only one pair is rolled, then

the two pairs will be “fifighting” each other. Use the following procedure to simplify

diagnosis:

1. Disconnect one pair of wires.
2. Calibrate the valve, verifying the correct movement of the valve.
3. Reconnect the fifirst pair of wires.
4. Disconnect the other pair of wires.
5. Calibrate the valve, verifying the correct movement of the valve.
6. Reconnect all the servo wires.
7. Calibrate the valve, verifying the correct movement of the valve.

The mechanical bias adjustment of the servo valve can affect the results of on-board

diagnostics. A set-screw on the servo valve causes a deflflection from center position

of the servo valve spool. This allows hydraulic flfluid to escape the actuator, and the

valve to close at controlled rate, in the absence of an electrical signal.

For a typical hookup, a small negative voltage 5X00622G01 on the servo valve is required to

center the spool, and hold the valve in a steady position. This voltage is typically

from -100 to -300 mV. Servo valves are delivered from the factory with this

adjustment. On board diagnostics assume that the servo valve is set up in this way.

If another setup is used, program the Ovation Controller to ignore the results of

diagnostic bits.

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