Basic HTML Version
actuators and accessories
www.vici.com
|
Valco Instruments Co. Inc. Sales:
800–367–8424
Fax: 713–688–8106
|
189
tech Tip
Multi-drop cables permit a single serial port
(RS‑232) to control multiple microelectric actuators.
Two Position Microelectric Actuators
CE certified
Stall-sensing circuitry – no mechanical microswitches
High speed switching – <100 ms in EQ model
A model for every valve we sell
speed and torque:
inversely proportional
SPEED
Low
High
TORQUE
Low
High
EQ
EH
EP
ED
ET
which model
forwhich two positionvalve?
Fitting
Valve Actuator
Valve Actuator
size
type model
type model
Valco GC
Valco HPLC
1/32"
W
E H
W
EP
1/16"
W
EH
W
EP
1/16"
UW
ED
UW
ED
1/8"
UW
ED
UW
ED
1/4"
MW
ET
—
-
—
Cheminert HPLC & Low Pressure
All valves
E H
The two position microelectric
actuator features exclusive stall-
sensing circuitry which eliminates
problems associated with valve/
actuator misalignment. Power to
the actuator motor is switched off
when the driver pin goes against the
stop of the valve cutout – no sooner,
no later – and it’s all done without
any mechanical microswitches. Not
only does this mean that alignment
problems are a thing of the past, it
means that you can stock one actuator
for valves that turn 30°, 36°, 45°, 60°,
90°, or anything in between.
During initialization, the valve rotates
at moderate speed while the actuator
waits to sense the stall. Once the
rotation angle has been measured and
confirmed by repetition, the angle is
memorized and actuation takes place
at maximum speed. Valve position
memory is maintained even in the
event of a power failure. There is
nothing more to do unless you wish
to install a valve with a different angle
of rotation. In that event, cycling the
actuator with no valve mounted sets
up reinitialization.
Microelectric actuators
for two position valves
Standard voltage 24 VDC. Includes autosensing 24 VDC power supply.
Standoff version includes a 2" standoff. 3", 4", and 6" standoffs are also available.
Consult the chart below to determine which actuator model is best suited for your valve.
With closemount
With 2" standoff
For use with
assembly
assembly
existing standoff
Description
Prod No
Prod No
Prod No
Highest speed actuator
E Q
EQ2
E QS
High speed actuator
EH
EH2
E HS
Medium torque actuator
E P
EP2
E PS
High torque actuator
E D
ED2
E DS
Highest torque actuator
E T
ET2
E TS
RS-232 interface cable
Description
Prod No
RS-232 interface cable
I-22697
Multi-drop cables
for multiple microelectric actuators
Multi-drop cables permit a single serial port (RS-232) to control multiple
microelectric two position and multiposition actuators. Cables have one female
DB9 and 2 to 8 male DB9 connectors – approximately 6" long.
Note:
The RS-232 interface cable (I-22697), above, is required for
each
actuator.
No. of actuators
Prod No
to be controlled
2
I-22897-02
3
I-22897-03
4
I-22897-04
5
I-22897-05
6
I-22897-06
8
I-22897-08
microelectric
actuator
control module
multidrop
cable
(I-22397-03)
rs-232
interface
cable
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail: sales@chromtech.net.au Tel: 03 9762 2034