A0845A 3BSE045584R1 ABB PLC module

A0845A 3BSE045584R1 ABB PLC module

Technical data of product parameters

Now the A0845A 3BSE045584R1  moves to the 100% position. The feedback voltage is examined,
and if it exceeds 10.0 volts, feedback gain is reduced. Once feedback voltage is
less than +10.0 volts, it is recorded as the 100% calibration value.
The valve moves back to 0% and the voltage at 0% is recorded. Feedback gain
is not adjusted.
The last step is to write 0% position, 100% position, and feedback gain to the
EE memory.
Once the d ata is recorded in EE memory, the firmware clears a restriction flag,A0845A 3BSE045584R1
allowing the module to transfer from local mode back to normal mode. At this
point the valve is under the control of the MA station and will return to the
previous position according to the tuning of the MA.he valve positioner is not affected because the demodulator is a diode
rectifying type. Also, the secondary pairs (A and B), can be swapped. The result
will be a change in sign of the calibration values. Arithmetic in valve positioner
firmware will yield the correct result. However, the user should follow the
recommended hookup that will yield negative values at 0% and positive values 9904-149
at 100%, and avoid confusion.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 deflection from center position
of the servo valve spool. This allows hydraulic fluid to escape the actuator, and the 9904-149
valve to close at controlled rate, in the absence of an electrical signal.
For a typical hookup, a small negative voltage 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.

Product picture display

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