VA-9070 Series Electric Rotary Actuators for Two-Position
and Modulating Service
Code No. LIT-977322
Installation Instructions
Issued May 29, 2007
Supersedes March 14, 2005
•
The motor full load current is noted on the
nameplate of the actuator. The terminal strip
accepts wire sizes ranging from 10 to 22 AWG
(12 to 22 AWG for the servo). Do not use wire
smaller than 18 AWG.
Mounting
When mounting the actuator in the standard position,
orient the actuator with its handwheel in a vertical plane
and parallel to the pipeline. When mounting the
actuator on a vertical pipe, position the acutator with
the conduit entries on the bottom to prevent
condensation from entering the actuator by way of the
conduit. In all cases, position the conduit to prevent
drainage into the actuator.
•
•
Terminate all field wiring at the actuator terminal
strip in accordance with the wiring diagrams
attached to the inside of the actuator cover.
Properly seal the conduit connections to maintain
the weatherproofed integrity of the actuator
enclosure.
Mount the actuator to the valve using the following
procedure:
1. Manually operate the actuator until the output shaft
of the actuator lines up with the valve stem. If
possible, use an intermediate position (such as
valve disc/stem and actuator half-open).
Setup and Adjustments
You must set the electrical travel switches to trigger
prior to reaching the mechanical travel stops. The
travel switches are labeled for open and close. The
cams are color-coded (green for open; red for closed).
2. Place the proper sleeve adaptor (if required) onto
the valve stem. Apply a small amount of grease to
the sleeve adaptor to ease assembly.
Manual travel stops are designed to prevent manual
overtravel, not to stall the electric motor. The travel
stops have an adjustment range of approximately
10 degrees.
3. Install the furnished mounting studs by threading
them all the way into the actuator base. (Insert the
short, threaded length into the actuator.)
Closed Travel Switch and Travel Stop
Adjustment
1. Loosen the mechanical stop for the closed
position, and back it off so that it does not interfere
with actuator travel. The closed stop is located on
the right when viewed from the travel stop side of
the actuator.
4. Mount the actuator onto the valve stem. Be sure
the mounting studs are properly aligned with the
holes in the top plate of the valve or the mounting
bracket. If necessary, manually override the
actuator to align the mounting studs with the
mounting holes.
5. Lower the actuator onto the valve, and secure it
tightly in place with the furnished hex nuts and lock
washers.
2. Remove the indicator rotor by pulling it up. This
action exposes the machined groove on the end of
the camshaft, which is the reference for the valve
disc position.
Wiring
Connect the actuator to field wiring:
3. Manually operate the actuator handwheel
Clockwise (CW) until the valve reaches the desired
closed position.
•
•
The heaters use approximately 0.5 amperes at
110 volts.
4. Rotate the red adjusting knob (by hand or with a
flat-head screwdriver) until the cam lobe barely
trips the switch from a CW direction.
Remove the metal conduit plug for the power
connection. Each actuator has two conduit entries
(one for power and one for control). The remaining
square-head conduit plug is weatherproofed but
may eventually degrade. If the square-head
conduit plug degrades, replace it with a metal plug.
Note: If the rotation of one cam moves the other cam,
hold the other knobs or cams during adjustment.
VA-9070 Series Electric Rotary Actuators for Two-Position and Modulating
Service Installation Instructions
1
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