User Manual

1
Technical Note 415
Valco Instruments Co. Inc.
Multiposition
Microelectric Valve Actuators
Models EMH and EMT
The microelectric multiposition actuator consists of a control module, a steppermotor/gearbox assembly,
a manual controller (use is optional), a universal AC input (100-240 VAC, 50-60 Hz) to 24 VDC power
supply, and the interconnecting cables.
The time it takes to step a valve from one position to another depends upon the actuator model, the
number of positions for which the actuator is set, and the total amount of rotation involved. Actual
times can be computed from the tables below.
NOTE: With the exception of Valco P type valves (which have a visible coil spring), all our multiposi-
tion valves are keyed to provide automatic alignment on a microelectric actuator. However, not all
standoffs (an extension which holds the valve away from the actuator) are keyed. Therefore, if you
are ordering components separately or retrofitting a valve and actuator with a standoff, make sure you
specify a keyed standoff so that you can take full advantage of the ease of alignment provided by a
keyed standoff, microelectric actuator, and valve.
Installation and Use
Getting Started
Figure 1 on the next page shows the functions of the cables supplied with the actuator. There are four
connectors on the control module, keyed and sized to prevent incorrect connection.
Number of
positions
set


















Time req.
to move
one position
Time per
additional
position
EMH
(
high speed
)
actuator












Number of
positions
set






Time req.
to move
one position
Time per
additional
position
EMT
(
high torque
)
actuator