Johnson Controls VA-8052, Руководство пользователя

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VA-8052 Technical Bulletin 5
a controller. To change the
factory settings, proceed as
follows:
Stroke Adjustment (See Fig. 1)
1. Adjust the stroke
potentiometer fully CCW to
maximum. Adjust the span
potentiometer fully CCW to
minimum.
Zero Adjustment
2. Adjust the zero potentiometer
fully CCW to maximum.
3. Provide an input signal
equal to the desired zero
(starting point) value and
then wait for the actuator to
stroke to the stem-up position
and the limit switch clicks.
4. Slowly adjust the zero
potentiometer CW until the
actuator just begins to stroke.
Span Adjustment
5. Adjust the span potentiometer
fully CW to maximum.
6. Provide an input signal
equal to the desired full
stroke voltage. (This value
must be at least 2.5
VDC greater than the
zero value.)
7. Slowly adjust the span
potentiometer CCW until
the actuator is fully stroked
to the stem-down position.
The drive coupler must not
contact the bottom surface
of the actuator yoke.
Calibration for 3/4 in. Stroke,
2-Way PDC Valves
The stroke, zero and span
settings are factory calibrated to
accept a 0 to 10 VDC from a
controller. To change the
factory settings, proceed as
follows:
Stroke Adjustment (See Fig. 1)
1. Adjust the stroke
potentiometer fully CCW to
maximum. Adjust the span
potentiometer fully CCW to
minimum.
Zero Adjustment
2. Adjust the zero
potentiometer fully CCW to
maximum.
3. Provide an input signal
equal to the desired zero
(starting point) value and
then wait for the actuator to
stroke to the stem-up
position.
4. Slowly adjust the zero
potentiometer CW until
the actuator just begins to
stroke.
Span Adjustment
5. Adjust the span
potentiometer fully CW to
maximum.
6. Provide an input signal
equal to the desired full
stroke voltage. (This value
must be at least 2.5 VDC
greater than the zero value.)
7. Slowly adjust the span
potentiometer CCW until
the actuator is fully stroked
to the stem-down position
and the limit switch clicks.
Wiring
All wiring must be in accordance
with applicable electrical code
requirements. Input lines to the
actuator must be wired correctly
for the valve to work.
!
CAUTION: Use the
VA-8000-101 Insulator Kit
for steam applications,
280°F (138°C) maximum.
Repair Information
Field repairs must not be made.
For a replacement VA-8052,
contact the nearest Johnson
Controls branch office.
Controls Group
507 E. Michigan Street
P.O. Box 423
Printed in U.S.A.
Milwaukee, WI 53202
Fig. 4 -- Typical Application
Application and Drawing
Identification
Fig. 5 -- VA-8052 Dimensions in./mm