ABB module 3BHB003688R0101

ABB module 3BHB003688R0101

Technical data of product parameters

In abnormal situations, such 3BHB003688R0101as during maintenance, some valves may be in normal
mode, and some may be in local mode. In this situation the valve in local mode will
respond to raise/lower action, but the valves in normal mode will not. The
Controller application will warn or notify the operator of the mode of each valve.
Since the SLIM will be connected to a group of Valve Positioners, each Valve
Positioner must control its own transmit enable. Each SLIM enables its transmitter 3BHB003688R0101
when placing a response into the transmit buffer. It also starts a 25 mSec timer,
which, when expired, disables the transmitter. View the servo voltage at terminal screws 14B and C, and 13B and C. Note that
if the servo voltage has integrated to a few volts negative, and hydraulic fluid is 3BHB003688R0101
applied suddenly, the valve will ‘pop’, and the on-board PI will respond and
bring the valve back to the target position of 0%. If the target position of 0% is
less than ‘seatLimit’, servo voltage will be positive, thus driving the valve hard
to the seat.
6. With the valve closed, you can execute the 0% calibration sequence to find the
exact reading for the 0% position. If you believe the 100% calibration is close,
the valve can then be operated without calibrating the 100% position, since
there is little flow change when the valve is fully opened.
7. Verify that the VP is in the normal operating mode as indicated by the card edge 3BHB003688R0101
LED.
8. When you determine that it is time to operate the valve, un-isolate the valve
hydraulically, drive the target position of the MA to the desired position, and
then switch the MA back to ‘auto.’If a servo valve is wired backwards (that is, the wire pair is rolled), the valve will
move in the opposite direction. This is a positive feedback situation. The movement
of the valve does not cure the position error, it increases it, thus causing the output
voltage to move even faster, and drive the valve harder in the wrong direction.

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