VA7820-HGx-2 / VA7830-HGx-2
1
This document is subject to change without notice
English
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”...2” if brass trim;
• ½”...2” if stainless steel trim.
Figure 1:
Dimensions in inches (mm)
Mounting
Figure 2:
Mounting Positions
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.
Figure 3:
Manual Positioner
(1).
Insert the 0.2” (5 mm) Allen wrench into the hole in the shaft located
on top of the actuator. Turn in the direction indicated by the arrow, to
move the
spindle
to the desired position.
(2).
When the spindle is in the desired position, push down completely
and let the shaft rotate in the opposite direction than before, until the
shaft stops. Remove the allen wrench.
To unlock the manual positioner, rotate (by means of the Allen wrench) in the direction
indicated by the arrow on the actuator
(see Figure 3 - 1)
by about 20-30 degrees and
release it.
Figure 4:
Mounting actuator on the valve
Ensure that coupler is in the correct position, otherwise readjust it by means of the
manual override. The stem on the valve has to be completely up. The end stroke
cursors have to be manually tight on the stroke indicator.
(1).
Coupler correct position
(2).
Extend completely the valve stem
(5).
Screw manually the coupler till the end
(7).
Lock coupler and lock-nut with maximum torque indicated
(8).
Move manually the end-stroke cursors against the indicator
Wiring
Figure 5:
Wiring diagrams
Table 1: DIP switch setting
Self calibration
IMPORTANT:
The standard control signals are selected by setting DIP switches 2, 3
and 4, within the range: 0…10 V DC or 0…20 mA.
Factory default parameters: 0...10 V DC.
(See Figure 5 “Wiring Diagrams” and Table 1 “DIP Switch Setting”).
• To start self calibration cycle push and hold the button for at least 3 seconds
(See Figure 6 - a.)
.
• During the procedure
green LED is fast blinking
.
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 extended and retracted limits.
• The end stroke cursors are automatically placed at the stroke limits.
Standard input signal
DIP SWITCH 3 = OFF
• The green LED switches on steady 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.
IMPORTANT:
These devices are not suitable for plenum applications.
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.
IMPORTANT:
Use suitable flexible metallic conduit or its equivalent with the ½ inches
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.
IMPORTANT:
It is recommended to set the actuator to the desired control signal and
action before fitting to the valve.
(See Figure 5 “Wiring Diagrams” and Table 1 “DIP Switch Setting”).
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.
IMPORTANT:
•
Each time the actuator is powered up (e.g. after a power black-out) the manual
positioner unlocks
automatically.
•
The automatic unlock
could not operate
properly if the actuator has been manually
positioned at the opposite end stroke than the spring return position.
WARNING: Risk of Electric Shock.
Disconnect each of the multiple power supplies 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 sever personal injury
or death.
WARNING: The CMOS integrated circuits in the controller are sensitive to
static electricity. Take suitable precautions.
DIP
Switch
number
Description
State
1
Control Type
OFF
Proportional control
ON
Floating control/Open-Close
2
Input Signal
OFF
Voltage input signal
ON
Current input signal
3
Input Signal Range
OFF
Pre-defined setting
ON
Custom setting
4
OFF
0-10 V
0-20 mA
ON
2-10 V
4-20 mA
5
Action
OFF
Direct action
ON
Reverse action
6
Pre-set actuator
position at signal
loss
OFF
Actuator stem retracted
ON
Actuator stem extended
7
Stroke speed
OFF
6 s/mm
ON
3 s/mm
8
NOT USED
NOT USED
IMPORTANT:
Power must be connected before the self-calibration cycle can be
started and the actuator has to be already mounted on the valve.
