VICI Valve actuators: Microelectric Two position - Manual

1
Two Position Microelectric
Valve Actuator
(Control module serial numbers starting with EM2C)*
The microelectric actuator consists of a control module, a stepper motor/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 actuator is self-adjusting from 30° to 90° – no valve alignment is
necessary. Once a valve is installed by tightening the clamp screw, the actuator senses the positive
stops within the valve and memorizes them in the first four moves.
The time it takes a valve to cycle from Position A to Position B
depends on the amount of rotation involved. To determine the
number of degrees in the angle of rotation, divide 360° by the
number of ports in the valve. Then consult the table at right.
Installation and Use
Getting Started
Figure 1 on the next page shows how to connect the various actuator components. There are four
connectors on the control module, keyed and sized to prevent incorrect connection.
Cable and Connector Functions
Input power (20-30 VDC, with 24-28 VDC preferred) is supplied through
a coaxial connector: the inner pin is + voltage and the outer pin is
ground. The average DC current requirement is 2.5 amps. Standby
current draw is 60 milliamps. The actuator should not share a power
supply with other noise-sensitive electronics, as the high current draw
can cause problems.
Motor driver output is through the five-pin connector: pins 1, 2, 4, and
5 carry the stepper motor phase drive signals. Pin 3 is grounded and
tied to the cable shield to reduce electrical noise.
A three-pin connector is used for the RS-232 interface: pin 1 is ground,
pin 2 is transmit to the host computer, and pin 3 is receive from the
host. (A discussion on serial control of the actuator starts on page 3.)
The ten-pin connector is for the manual controller or for digital input/output signals; the actuator can
be controlled by either or both. The manual controller has a through port, so an additional cable can
provide simultaneous control by an external system. (Digital control of the actuator is discussed on
page 3.)
Technical Note 413
Valco Instruments Co. Inc.
Pin # Signal Description
Input Power Cable
inner
+20-30 VDC power
outer Ground
Motor Driver Output Cable
1 Phase B
2 Phase B
3 Ground
4 Phase A
5 Phase A
36°
45°
60°
90° 70
85
110
145
90
115
150
235
EH EP
330
410
500
710
ET
140
175
235
300
ED
60
70
85
115
EQ
Switching times in milliseconds
* Serial numbers are on the underside of the control module. ( Figure 2) Actuators of this series, obsoleted in 2010, are further identified
by a metallic control module housing. If your actuator control module has a plastic housing and a serial number starting with E2CA,
please refer to Technical Note 421.