If you move both the actuator and command to the fully extended position,
then the valve LED will again extinguish, showing that zero volts are being sent
to the valve output. (You may need to reset the 'Hard Error Timeout' before the
valve output will be enabled again.)
Moving both the actuator and command to the 50% position the valve LED
will be extinguished, because the Position Feedback loop thinks the actuator is
at the commanded position. Now if you move either the Position Feedback or
commanded position, the valve will output a +/-5 volt signal as the Br-EFB tries
to command the actuator to follow the commanded position. If you increased the
gain to 2.000, the valve output would again reach +/-10 volts. Increasing the
gain even further will narrow how far apart the command and position sensor
need to be to reach the full +/-10 volt valve output. This is known as 'narrowing
the 'V", because as the gain is raised, it increases how tightly the actuator will try
to follow the position commands.
3)
Set Integral (I) Gain
This command lets you manually set the 'I' gain used by the currently
selected axis controlled by this Br-EFB. The 'I', or 'Integral' gain is used in a PID
ServoLoop to nudge the actuator that last little bit to get it to the commanded
position.
When an actuator is very near the position it is being commanded to move
towards, the difference between the current position (as measured by the
Position Feedback element on the actuator) and the commanded position are
too close for the positional ('P') gain to output a sufficient voltage to move the
actuator the last little bit.
The 'I' gain will give a steadily rising voltage to the valve output until it rises
high enough to 'nudge' the actuator the last little bit to get to the commanded
position.
If the 'I' gain is turned up too high, then the movement will constantly seek the
desired position, overshoot, and seek again. Unlike the oscillation that occurs
when the 'P' is set too high, the 'I' oscillation occurs at a low speed. Although
entertaining, it is rarely destructive. If the 'I' is adjusted too low, then the 'dead
band' around the desired position will be slightly wider.
4)
Set Derivative (D) Gain
This command lets you manually set the 'D' gain used by the currently
selected axis controlled by this Br-EFB. The 'D', or 'Derivative' gain is used in a
Gilderfluke & Co.• 205 South Flower Street • Burbank, California 91502 • 818/840-9484 • 800/776-5972 • fax 818/840-9485
Br-EFB Manual / May 22, 2018 3:28 PM / page 99 of 142
