Brochure

Motorized Actuator 2-10 Volt
MVA 2-10V
Tunstall Corporation
118 Exchange Street • Chicopee, MA 01013
© July 2014
We reserve the right to alter designs, specifications and information without notice.
Phone [phone] · Fax [phone]
www.tunstall-inc.com • www.maconcontrols.com
Bulletin-MVA2-10V-0714
Electric Operators
2
Status Description
OFF No power applied
Flashing green Actuator moving to position
Continuous green light Position reached
Flashing red Calibration cycle
Continuous red light No input signal
LED Status Indicator
Operating
When being put into service (with valve fitted), the
actuator moves to both end positions and stores the
associated increments. The range of the control signal
is then assigned to this effective stroke. The motor
positions the valve and cuts out as soon as the stroke
position matches the controller’s output signal. In the
end positions or in the event of an overload, the motor
cuts out after 2 minutes at the latest. If the control
voltage has not changed after 2 hours (in the range of
0 - 0.5 V), the motor briefly runs to the end position
and corrects its position memory (if necessary). The
MVA 2-10 performs a complete cycle every 24 hours
in order to prevent the valve plug from jamming or
sticking. The LED lights up if power is applied and
flashes as long as the motor is running.
Direction of operation 1:
As the positioning signal increases, the actuator
spindle extends on 2-way through valves and on the
EDV 3-way valve the control passage opens.
Direction of operation 2:
As the positioning signal increases, the actuator
spindle retracts on the 2-way through valves and on
the EDV 3-way valve the control passage closes.
The black ground cable 1a (24 V~) and the blue
ground cable 1b (control voltage) should both be con-
nected to a common ground cable.
After removing the cap on the cover, the following
settings can be made using jumpers:
 The input signal can be set to 0 - 10 V, 5.2 - 10 V
or 0 - 4.8 V.
 The direction of operation 1 or 2 can be selected;
the factory setting is 1 (DA).
Put the cap back on after making the settings.