Bimba PCS - Manual (Page 19)

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LED goes off. (If the Span potentiometer was adjusted too far and the actuator
moved, adjust the Span potentiometer CCW just enough to move the actuator
back to the full scale position. If adjusted too far, the Green LED will come back
on). Both LEDs should be off when set correctly. This ends the preliminary Span
adjustment.
If neither LED is on - (Span is currently set somewhere in mid-stroke.) Slowly
adjust the Span potentiometer CCW to move the actuator rod or shaft toward the
full scale position. When the actuator hits the full scale position, the green LED
will continue to flicker even when the adjustment is no longer being turned. Now
adjust the Span CW just enough to turn off the green LED. Both LEDs should be
off when set correctly. This ends the Preliminary Span adjustment.
15.
FINAL “ZERO” AND “SPAN” ADJUSTMENT
The Zero and Span adjustments may need to be fine tuned. This is accomplished
by setting the Main control to the zero position signal (0 volts, 0 mA, or 4 mA)
and repeating Step 12, being careful to make very small adjustments, as the
setting should already be very close. Now recheck Step 13 and make any small
adjustment that may be necessary.
This completes the final Zero and Span adjustments.
16.
“DECEL” RANGE ADJUSTMENT
Low Decel settings provide fastest speeds. High Decel settings provide the most
stability for high loads. If deadband is set too low for the load, the rod will
overshoot and undershoot the target position, oscillating before settling to a stop.
The default setting is 1.5 volts. But it can be varied from 0.5 to 13.5 volts. To
adjust the Deceleration Range, rotate the DECEL potentiometer as shown in the
photo below and monitor the voltage between TP1 and TP3.
TP1
TP3
Decel
TP1
TP3
Decel
DECEL ADJUSTMENT