Valco Instruments Co. Inc. VICI EMHCA Quick start guide

Micro – Electric
Multiposition Valve Actuator
Installation and Use
The microprocessor-based multiposition actuator consists of the control module, the stepper motor/
gearbox assembly, a manual controller (use is optional), a 110 or 220VAC to 24VDC power supply,
and the interconnecting cables.
Connections
Figure 2 shows the functions of the cables suppled with the actuator.There are four connectors on
the control module, keyed and sized to prevent incorrect connection.
Input power (20 – 30 VDC, with 24 – 28 VDC preferred) is supplied through a four-pin connector:
pins 1 and 2 are positive inputs; 3 and 4 are negative. The four wires of the power supply cable are
functionally paired to provide the lowest possible impedance. We strongly recommend that all four
wires be connected to the power supply source to prevent any loss of torque. Average DC current
requirement is 2.5 amps, with transient peaks as high as 4 amps. Standby current draw is less than
100 milliamps.
NOTE: Noise-sensitive electronics may experience problems when sharing the 24V power supply
with the actuator.
4.44"
2.2"
1.2"
1" .75"
1.95"
1"
2.275"
1.375"
(Clamp ring)
.9"
8-32
MOUNTING
HOLES*
Figure 1: Mounting dimensions
Technical Note 415
Valco Instruments Co. Inc.

MULTIPOSITION ACTUATOR
CONTROL MODULE
POSITION
ROTATION
STEP HOME
TO 110 OR 220 VAC
(User must supply other
line cord configurations)
POWER SUPPLY
P/N PS24VDC
LINE CORD (IEC-320)
P/N I-W-17600
RED/BLACK
GREEN/WHITE
GND
+24-28 VDC
TO EXTERNAL
CONTROL SYSTEM
PIN 1
OPTIONAL
INPUT POWER CABLE
P/N I-22535
MOTOR DRIVER
OUTPUT CABLE
P/N I-22540
PIN 1 PIN 1
MOTOR/GEARBOX
ASSEMBLY
P/N EMHMA (High speed)
or EMTMA (High torque)
MANUAL CONTROLLER
(Use optional)
P/N I-22679
PIN 1
MOUNTING
BRACKET
P/N I-22596
MANUAL
CONTROLLER
CABLE
P/N I-22696-01
PIN 1 PIN 1
P/N EMHCA (High speed)
or EMTCA (High torque)
OPTIONAL
SERIAL PORT
(RS232) CABLE
P/N I-22697
DB-9
CONNECTOR
(FEMALE)
TO COMPUTER
Figure 2: Actuator and controller connections
Valco Instruments Co. Inc.
PIN 1
REMOTE
CONTROL
CABLE
P/N I-22696

Motor driver output is through a 10 pin connector. The 26-pin connector is for themanual controller
ordigital input/output signals. (Theactuator canbe controlledby eitheror both.Themanualcontroller
has a through port, so an additional cable can provide simultaneous control by an external system.)
The three-pin connector is for a serial RS-232 interface. The digital and serial functions are fully
described on the insert page.
Manual Controller
The manual controller allows the user to select the rotation direction, set the total number of positions,
and control the STEP and HOME functions. The controller is connected to the actuator control mod-
ule with the 26 pin ribbon cable. The manual controller has two functional modes – the operating
mode and the setup mode.
(NOTE: An LED display of “EP” indicates a positioning error due to valve binding.)
Operating Mode
This is the default mode; that is, the controller will be in this mode when it is initially powered. In this
mode the STEP and HOME functions are clearly labelled as the primary functions of the left and right
switches, respectively. To change the direction of rotation, momentarily depress the STEP and HOME
switches at the same time. The DIRECTION LED’s will change, indicating that the direction has
reversed.
Setup Mode
To shift into the setup mode, depress the STEP and HOME switches for 8 seconds. The position
display LED’s will begin to flash, showing the current setting for the total number of positions in a full
rotation. Use the STEP switch to increase or the HOME switch to decrease the setting to the desired
value. To return to the operating mode, depress both switches until the LED’s stop blinking.
Simultaneous Use of the Manual Controller and an External Control System
The manual controller has two identical connectors for input and/or output, permitting an external
system to be used simultaneously with the manual STEP and HOME commands. However,
the
following precaution should be observed
:
If the STEP, HOME, and DIRECTION functions are to be used by
both systems, the external system
control output should be either contact closure or open collector outputs
rather than TTL signals .
While TTL signals will cause no damage to either system, they will effectively override the manual
controller.
Connecting External Systems
An external control system can be connected to the actuator in several ways:
1. The Digital Input/Output connector is a 26 pin dual in-line connector which can mate to a mass
terminatable flat cable connector availble from a number of manufacturers. The flat cable can then
be integrated into the control system.
2. The manual controller can be connected to the actuator, and then a 26 pin dual in-line connector
and flat cable assembly can be attached to the controller. This allows dual control as well as a
visual indication of the actuator position.
3.A breakout board can be attached to the Digital Input/Output port, either alone or in conjunction with
the manual controller. This provides screw terminal connections to the individual input/output
signals of the actuator control unit.
4.A serial port can be connected from a host control system to the actuator, using the optional RS232
cable (Product No. I-22697).

Valve Mounting
Cheminert valves
With the valve and actuator in Position 1, engage the drive pin of the valve with the coupling of the
actuator. Rotate the valve by hand until the pin on the actuator clamp ring lines up with the hole in the
face of the valve. Push the valve on all the way and tighten the clamp ring screw.
Serial Communication Protocol
Serial communication with the multiposition actuator is based on an ASCII string protocol. Carriage
return (OD hex) characters parse the communications by defining the end of each command. Line
feed characters (OA hex) are ignored.
The hardware interface utilizes only ground, transmit, and receive signals, on connector J3 pins 1, 2,
and 3, respectively. Software flow control (Xon/Xoff) is not supported. The baud rate is set at 9600
baud, no parity, 8 data bits, 1 stop bit. The serial port output (transmit line) of the actuator is disabled
(high impedance) when not in use. With the software-settable device “ID” feature, up to 10 actuators
can be controlled from a single serial port by a host processor such as a personal computer.
Command set options include the ability to request position and direction in a single command, or to
allowthe actuatortochoosetheshortest routeto theselected position. Otheroptionsinclude requesting
the current position or firmware identification, changing the number of positions if a different valve is
installed, and setting or clearing the command preface “ID”.
The following is a description and explanation of each command:
Serial Commands
NP<enter> Displays the number of positions the actuator is currently set to index
NP= nn <enter> Sets the number of positions ( nn ) for the current valve
CW nn <enter> Sends the actuator to position nn (from 1 to NP) in a clockwise direction
CC nn <enter> Sends the actuator to position nn (from 1 to NP) in a counterclockwise direction
GO nn <enter> Sends the actuator to position
nn (from 1 to NP)via the shortest route
CP<enter> Displays the current position
SD<enter> Displays the digital input status where 0 = enabled and 1 = disabled
SD=
n
<enter> Sets the digital input status to [0] enabled or [1] disabled
NOTE: At power up, digital input status is set to [0] enabled. Setting the status to [1]
locks out communication through the manual controller and remote control cables.
ID<enter> Displays the current device ID setting
ID=
n <enter> Sets the device ID to value
n , from 0 to 9
NOTE: when the ID feature is enabled, all commands to the device must be prefaced
by the ID. (Assigning an ID of *** disables this feature)
VR<enter> Displays the part number and date of the firmware

Digital Input / Output Protocol
Digital input/output control of the multiposition actuator is designed for simplicity and flexibility of
function. The simplest control of the actuator can be accomplished with two output control lines –
STEP and HOME. On the other hand, the actuator can accept a latched BCD input with manual and
automatic direction signals.
Theinputs are held to a logical high (+5 volts) by pull-up resistors, and are designed to be driven low
either by contact closure, 5 volt digital logic, or open collector transistor outputs.The signal polarity is
defined as “negative true” – asserting the signal involves shorting the signal (in the case of contact
closure) or driving it (in the case of logic or transistor signals) to within 0.8 volts of ground potential.
These input signals must be at least 30 milliseconds in duration. The outputs are also“negative true”
signals driven by standard high speed CMOS gates, capable of driving standard logic input gates.
They include the BCD position, motor run, rotational direction, and error signals. If the actuator stops
out of position due to a stuck valve, the BCD output is set to “0” (all lines high for a negative true
output).
The digital interface is made through a 26 pin connector which also provides power (+5 volts/100 ma
maximum) and ground outputs. The ground should be connected to the control system to maintain
commonality between the actuator and the controlling device. If you intend to provide your own
power supply, make sure that it has an isolated output or that it shares a common ground with the
controlling system.
Pin signal definitions for the Digital Input/Output cable
Pin Color Signal Direction Pin Color Signal Direction
1brown Home Input 14 yellow 1.4 BCD Output
2red Motor run Output 15 green 10.2 BCD Output
3orange Step Input 16 blue 1.2 BCD Output
4yellow Error Output 17 violet 10.1 BCD Output
5green Manual Dir. Input 18 gray 1.1 BCD Output
6blue Direction Output 19 white 10.8 BCD Input
7violet Auto Dir. Input 20 black 1.8 BCD Input
8gray Data latch Input 21 brown 10.4 BCD Input
9white +5 VDC 100 ma Output 22 red 1.4 BCD Input
10 black Ground Output 23 orange 10.2 BCD Input
11 brown 10.8 BCD Output 24 yellow 1.2 BCD Input
12 red 1.8 BCD Output 25 green 10.1 BCD Input
13 orange 10.4 BCD Output 26 blue 1.1 BCD Input
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