Johnson Controls VA7820-GG Serie Manual De Instrucciones página 5

English
READ THIS INSTRUCTION SHEET AND THE SAFETY WARNINGS
CAREFULLY BEFORE INSTALLING AND SAVE IT FOR FUTURE USE.
General Features
VA78x0-xxx-1x model can be mounted on VG7000T valves:
• DN25...50 if brass trim
• DN15...50 if stainless steel trim
VA78x0-xxx-12 model can be mounted on VGS8xxx (DN15...50) /
VG8000 (DN15...40) / VG9000 (DN15...65) valves.
Figure 1: Dimensions in mm and mounting components
Mounting
Figure 2: Mounting positions
IMPORTANT: It is recommended to set the actuator to the desired control signal
and action before fitting to the valve.
(See Figure 6: Wiring diagrams and Table 1: DIP switch settings).
Tools
• Allen wrench, 4 mm
• Screw driver, 5 mm or #2
Only for VA78x0-xxx-11 models:
• Hex wrench, 14 mm and 19 mm
Manual positioner
These models of actuators are equipped with a manual positioner that allows to move
the spindle only when the power supply is not present.
WARNING:
• It is recommended to use the manual positioner only when the actuator
is not powered, because the actuator spindle retains its position until
the power supply is connected. (The controller takes first priority.)
• Be sure that the actuator has reached the rest position (stem extended
or retracted, depending on the model), before manually positioning
the actuator.
• After any manual operation, it is recommended to restart the self
calibration cycle, or wait for the next valve full stroke cycle for the
automatic calibration of the actuator.
Figure 3: Manual Positioner
(1.) MOVE: Insert the crank (under the actuator) into the hexagonal hole located on
top of the actuator. Turn in the direction indicated by the arrow to move the
spindle to the desired position.
(2.) LOCK: When the spindle is in the desired position, push down completely and let
the shaft rotate in the opposite direction, until the shaft stops. Remove the crank.
(a.) UNLOCK: To unlock the manual positioner, rotate the crank in the direction
indicated by the arrow on the actuator by 20° to 30° and release.
IMPORTANT:
• Each time the actuator is powered up (for example, after a power loss) the
manual positioner unlocks automatically.
• The automatic unlock may not operate properly if the actuator has been
manually positioned at the opposite end stroke to the spring return position.
Figure 4: Mounting the actuator on the valve (VA78x0-xxx-11)
Ensure that the coupler is in the correct position. Otherwise, readjust it using the
manual override. The stem on the valve must be fully extended. The end stroke
cursors must be manually tight on the stroke indicator.
(1). Position the coupler.
(2). Extend the valve stem completely and manually tighten the lock nut.
(3). Position the actuator on the valve bonnet and close the locking yoke.
(4). Fix the actuator on the valve tighting screw.
(5). Manually tighten the coupler until the end is holding the valve stem.
(6). Manually tighten the lock nut counter-clockwise until the end.
(7). Hold the coupler and tighten the lock nut.
(a). HOLD
(b). TIGHTEN
(8). Manually position the end-stroke cursors against the indicator.
Figure 5 : Mounting the actuator on the valve (VA78x0-xxx-12)
Ensure that the coupler is in the correct position. Otherwise, readjust it using the
manual override. The stem on the valve must be fully extended. The end stroke
cursors must be manually tight on the stroke indicator.
(1). Position the coupler.
(2). Extend the valve stem completely and manually tighten the lock nut.
(3). Position the actuator on the valve bonnet and close the locking yoke.
(4). Fix the actuator on the valve tighting screw.
(5). Half couplers
(6). Half couplers in the correct mounting position
(7). Manually position the end-stroke cursors against the indicator.
Wiring
WARNING: Risk of electric shock.
Disconnect the power supply before making electrical connections.
More than one disconnect may be required to completely de-energize
equipment. Contact with components carrying hazardous voltage can
cause electric shock and may result in severe personal injury or death.
Figure 6: Wiring diagrams for VA78x0-GGx-xx
(a).Wired as proportional voltage input - factory wiring
(b).Wired as proportional current input
(c).Wired as floating
(d).Wired as open / close
(e).For VA78x0-GGC-1x only
IS_VA7820-VA7830_P/N 14-88375-25 Rev. D_10 2022
WARNING: The CMOS integrated circuits in the controller are sensitive
to static electricity. Take suitable precautions.
Table 1: DIP switch settings
DIP switch Description
number
1 Control type
2 Input signal
3
Input signal range
4
5 Action
Pre-set actuator
6
position at signal loss
7 Stroke speed
8 —
Self-calibration
Figure 7: Starting self-calibration
(a.) Calibration button
(b.) DIP switches
(c.) Electronic board
• The standard control signals are selected by setting DIP switches 2, 3, and 4, within
the range: 0...10 VDC or 0...20 mA. Factory default parameters: 0...10 VDC.
(See Table 1: DIP switch settings).
IMPORTANT: Power must be connected before the self-calibration cycle can be
started, and the actuator must be already mounted on the valve.
• To start self calibration cycle push and hold the button for at least 3 seconds.
(See Figure 7 - a)
• During the procedure, the green LED blinks quickly.
• The actuator will make one full cycle to detect the stem extension and retraction
limits.
• The end stroke cursors are automatically placed at the stroke limits.
Standard input signal
DIP switch 3 = OFF
• The green LED switches on steadily when the position is reached.
• If the control signal changes, the actuator stem moves to reach the new position.
During the spindle movement, the green LED blinks.
Custom input signal
DIP switch 3 = ON - Max range 0-10 VDC or 0-20 mA
(See Table 1: DIP switch settings).
• The custom input signal limits must be applied during the self-calibration cycle.
• First, set the minimum input signal (start-point), within the range 0...6 VDC
(0...12 mA) and confirm it by pressing the calibration button.
• The LED will illuminate, a steady green for 2 seconds, indicating correct entry. If the
LED illuminates a steady yellow for 2 seconds, an incorrect setting is indicated and
must be re-entered.
• Set the maximum input signal, within the range 3...10 VDC (6...20 mA) and confirm
it by pressing the calibration button.
• The LED will illuminates a steady green for 2 seconds, indicating correct entry.
IMPORTANT: If the LED illuminates a steady yellow for 2 seconds, an incorrect
setting is indicated and the procedure must be restarted.
• When the procedure is finished and the actuator returns to its operating mode,
reaching the position corresponding to the input signal value, the LED will illuminate
a steady green.
• If the control signal changes, the actuator stem will move to the new position. During
the stem movement, the LED flashes green.
Normal operating mode
• The actuator position is indicated by the end stroke cursors on the yoke.
• When the actuator moves, the green LED blinks.
• When the actuator stops, the green LED switches on steadily.
This document is subject to change without notice.
State
OFF Proportional control
ON Floating control / open-close
OFF Voltage input signal
ON Current input signal
OFF Pre-defined setting
ON Custom setting
OFF 0-10 V 0-20 mA
ON 2-10 V 4-20 mA
OFF Direct action
ON Reverse action
OFF Actuator stem retracted
ON Actuator stem extended
OFF 6 s/mm
ON 3 s/mm
—
1