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READ THIS INSTRUCTION SHEET AND THE SAFETY WARNINGS
CAREFULLY BEFORE INSTALLING AND SAVE IT FOR FUTURE USE.
General Features
VA7820-HGx-2 and VA7830-HGx-2 models can be mounted on VG7000T valves:
• 1 in. to 2 in. if brass trim
• 1/2 in. to 2 in. if stainless steel trim
IMPORTANT: These devices are not suitable for plenum applications.
Figure 1: Dimensions in inches (mm)
IMPORTANT: Use the VA7820 / VA7830 Series Electric Spring Return Valve
Actuator only to control valves under normal operating conditions. Where failure
or malfunction of the VA7820 / VA7830 Series Electric Actuator could lead to
personal injury or property damage to the controlled equipment or other property,
additional precautions must be designed into the control system. Incorporate
and maintain other devices such as supervisory or alarm systems or safety or
limit controls intended to warn of, or protect against, failure or malfunction of the
VA7820 / VA7830 Series Electric Actuator.
Mounting
IMPORTANT: Use suitable flexible metallic conduit or its equivalent with the
1/2 in. conduit fitting. To avoid stressing the actuator, use a tool to grasp the
conduit fitting when installing flexible metallic conduit or its equivalent.
IMPORTANT: Do not install or use this VA7820 and VA7830 Series Electric
Spring Return Valve Actuator in or near environments where corrosive substances
or vapors could be present. Exposure of the electric actuator to corrosive
environments may damage the internal components of the device, and will void
the warranty.
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).
Manual positioner
These models of actuators are equipped with a manual positioner that allows you to
move the spindle only when the power supply is disconnected.
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 models), 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 the crank 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
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.
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.
IS_VA7820-HGx-2 / VA7830-HGx-2_P/N 14-88375-92 Rev. F_10 2022
Figure 5: Wiring diagrams
(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-HGC-2 only
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
•
The standard control signals are selected by setting DIP switches 2, 3, and 4, within
the range: 0 to 10 VDC or 0 to 20 mA. Factory default parameters: 0 to 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 the self calibration cycle push and hold the button for at least 3 seconds.
(See Figure 6 - a)
•
During the procedure, the green LED blinks quickly.
Figure 6: Starting self-calibration
(a.) Calibration button
(b.) DIP switches
(c.) Electronic board
•
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 to 10 VDC or 0 to 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 to 6 VDC
(0 to 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 to 10 VDC (6 to 20 mA) and
confirm it by pressing the calibration button.
• The
LED will illuminate 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.
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 to 10 V
ON
2 to 10 V
OFF
Direct action
ON
Reverse action
OFF
Actuator stem retracted
ON
Actuator stem extended
OFF
6 s/mm
ON
3 s/mm
—
This document is subject to change without notice.
0 to 20 mA
4 to 20 mA
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