Alicat EPC Series Manuale utente

Electronic Pressure and Vacuum

Controllers

The Fastest Flow Controller Company in the World!

Operating Manual

EPCD-Series EPC-Series

Thank you for purchasing an E-Series Vacuum and Pressure Controller. Please take

the me to nd and read the informaon for your specic device. This manual

covers the following Alicat Scienc instruments:

EPC-Series Vacuum and Pressure Controllers

EPCD-Series Vacuum and Pressure Controllers

The installaon (plumbing, mounng and power/signal connecon instrucons

are applicable to all E-Series pressure devices.

Please contact Alicat at 1-888-290-6060 or [email protected]om if you have



06/30/2017 Rev.2 DOC-EPCMAN

Notice: Alicat Scientic, Inc. reserves the right to make any changes and improvements to the products

described in this manual at any time and without notice. This manual is copyrighted. This document may not,

in whole or in part, be copied, reproduced, translated, or converted to any electronic medium or machine

readable form, for commercial purposes, without prior written consent from the copyright holder.

Note: Although we provide assistance on Alicat Scientic products both personally and through our literature,

it is the complete responsibility of the user to determine the suitability of any product to their application.

Conformity / Supplemental Information:

The product complies with the requirements of the Low Voltage Directive 2006/95/EC and the EMC Directive

2004/108/EC and carries the CE Marking accordingly. Contact the manufacturer for more information.

TABLE OF CONTENTS Page

GETTING STARTED 3

MOUNTING 4

PLUMBING 4

POWER AND SIGNAL CONNECTIONS 4

INPUT SIGNALS 5

Analog Input Signal 5

RS-232 / RS-485 Digital Input Signal 5

OUTPUT SIGNALS 6

RS-232 / RS-485 Digital Output Signal 6

Standard Voltage (0-5 Vdc) Output Signal 6

EPC-SERIES SINGLE VALVE PRESSURE CONTROLLER OPERATION 6

EPCD-SERIES DUAL VALVE CONTROLLER OPERATION 6

RS-232 OR RS-485 OUTPUT AND INPUT 7

Flow Vision Soware 7

Addional Compable Programs 7

Sending a Command 7

Polling Mode 7

Streaming Mode 8

Data Format 8

Sending a Setpoint via RS-232 / RS-485 8

Sending a Setpoint to a Controller with Negave and Posive

Range via RS-232 / RS-485 9

PID Tuning 9

MAINTENANCE AND RECALIBRATION 10

Technical Data for EPC and EPCD Pressure Controllers 11

SIZE

PART NO./DESCRIPTION

REV.

MATERIAL

FINISH

303L Stainless

DIMENSIONS ARE IN INCHES

TOLERANCES:

ANGULAR:

30'

TWO PLACE DECIMAL

.015

THREE PLACE DECIMAL

.005

THE INFORMATION CONTAINED IN THIS

DRAWING IS THE SOLE PROPERTY OF

ALICAT SCIENTIFIC, INC. ANY

REPRODUCTION IN PART OR AS A WHOLE

WITHOUT THE WRITTEN PERMISSION OF

ALICAT SCIENTIFIC, INC. IS

PROHIBITED.

PROPRIETARY AND CONFIDENTIAL

Dual Valve EPC .125

DATE

7/13/15

7641 N Business Park Dr. Tucson, AZ 85743

520-290-6060 Ph. 520-290-0109 Fax

Checked by

Blank #

Notes:

1. Break all sharp edges .005/.015 x 45 Deg.

Radius optional.

2. Transport as to prevent damage

3. No nicks or dings allowed on machined

surfaces.

4. Remove all burrs

5. Do not Scale Drawing

6. Use listed material when blank is unavailable

SIZE

PART NO./DESCRIPTION

REV.

MATERIAL

FINISH

303L Stainless

DIMENSIONS ARE IN INCHES

TOLERANCES:

ANGULAR:

30'

TWO PLACE DECIMAL

.015

THREE PLACE DECIMAL

.005

THE INFORMATION CONTAINED IN THIS

DRAWING IS THE SOLE PROPERTY OF

ALICAT SCIENTIFIC, INC. ANY

REPRODUCTION IN PART OR AS A WHOLE

WITHOUT THE WRITTEN PERMISSION OF

ALICAT SCIENTIFIC, INC. IS

PROHIBITED.

PROPRIETARY AND CONFIDENTIAL

Dual Valve EPC .125

DATE

7/13/15

7641 N Business Park Dr. Tucson, AZ 85743

520-290-6060 Ph. 520-290-0109 Fax

Checked by

Blank #

Notes:

1. Break all sharp edges .005/.015 x 45 Deg.

Radius optional.

2. Transport as to prevent damage

3. No nicks or dings allowed on machined

surfaces.

4. Remove all burrs

5. Do not Scale Drawing

6. Use listed material when blank is unavailable

































  

















520-290-6060 Ph. 520-290-0109 Fax

















7641 N Business Park Dr. Tucson, AZ 85743











































Rev. No. Description Date

GETTING STARTED

Inlet Connecon Port

Outlet Connecon Port

EPC-Series Pressure Controller*

Inlet Connecon Port

Outlet Connecon Port

Vent Port

EPCD-Series Pressure Controller*

* Port posions may vary according to build.

MOUNTING

EPC and EPCD-Series Controllers have mounng holes for convenient mounng to

at panels. These controllers are posion insensive and can be mounted in any

orientaon. The sizes and dimensions for the mounng holes are shown on page 11.









PLUMBING







Controllers with M5 (10-32) ports have O-ring face seals and require no sealant

or tape. Do not use tape with welded or O-ring ngs.

For non M5 (10-32) ports use thread sealing Teon® tape to prevent leakage

around the port threads.

 the rst two threads. This will minimize the possibility of geng

tape into the ow stream and ow body.







When changing ngs, carefully clean any tape or debris from the port connecons.

POWER AND SIGNAL CONNECTIONS

Power can be supplied to your controller through the 6 pin Micro-Fit connector.

CAUTION! 

Pin Funcon Cable Color

1DC Power input Red

2Analog Out Brown

3 Ground Black

4Serial RS-232TX / RS-485(+) Blue

5Serial RS-232RX / RS-485(-) White

6Analog Setpoint Input Green

CAUTION! 



Standard 6 Pin Micro-Fit Pin-Out

456

INPUT SIGNALS

Analog Input Signal

Standard 0-5 Vdc : Apply analog input to Pin 6 as shown on page 4.

0-5 Vdc is the standard analog input signal. Apply the 0-5 Vdc input signal to pin

6, with common ground on pin 3.

Oponal 0-10 Vdc: If specied at me of order, a 0-10 Vdc input signal can be

applied to pin 6, with common ground on pin 3.

Oponal 4-20 mA: If specied at me of order, a 4-20 mA input signal can be

applied to pin 6, with common ground on pin 3.

NOTE: This is a current sinking device. The receiving circuit is essenally a

250ohm resistor to ground.

CAUTION! 







Wiring your EPC Cable into a DB9 RS-232 or RS-485 adaptor

To use the RS-232 or RS-485 input signal, connect the RS-232 / RS-485 Output

Signal (Pin 5), the RS-232 / RS-485 Input Signal (Pin 3), and Ground (Pin 8) to

your computer serial port as shown below. (See page 7 for details on accessing

RS-232 / RS-485 input.)















9876

15 3 24 1 532 4

Serial Cable End PC Serial Port

9 Pin Serial Connecon 6 Pin Micro-Fit Connecon

Pin Funcon Funcon Pin

6 Ground Ground 1

5 Transmit Receive 2

4Receive Transmit 3

DB9 to Micro-Fit Connecon for RS-232 / RS-485 Signals

Please Note: DB9 adaptor drawings shown represent the face of the cable,

wiring ports at the back of the adaptor will be mirrored.

OUTPUT SIGNALS

RS-232 / RS-485 Digital Output Signal

To use the RS-232 or RS-485 output signal, it is necessary to connect the RS-

232/ RS-485 Output Signal, the Input Signal, and Ground to your computer

serial port as shown on page 5. (See page 7 for details on accessing RS-232 /

RS-485 output.)

Standard Voltage (0-5 Vdc) Output Signal

Controllers equipped with a 0-5 Vdc will have this output signal available. This

voltage is usually in the range of 0.010 Vdc for zero ow and 5.0 Vdc for full-scale

ow. The output voltage is linear over the enre range. Ground for this signal is

common on Pin 3. Other output opons include 0-10 Vdc, 1-5 Vdc and 4-20 mA.

EPC-SERIES SINGLE VALVE PRESSURE CONTROLLER OPERATION

Alicat Scienc EPC-Series Pressure Controllers incorporate a digital pressure

gauge with a single control valve and circuitry. The integrated PID loop measures

the pressure, compares it with the setpoint, and adjusts the valve accordingly at

1000 mes per second.

The response me of the system will depend on the operang condions and the

PID tuning of the device.

Plumbing

EPC-Series Pressure Controllers are normally intended to control the process

pressure downstream of the controller. In order for this to occur, a supply pressure

greater than the full scale pressure control range of the device, not to exceed 150

psig, should be connected to the “IN” port.

EPCD-SERIES DUAL VALVE PRESSURE CONTROLLER OPERATION

Alicat Scienc EPCD-Series Closed Volume Pressure Controllers incorporate a

digital pressure gauge with dual control valves and circuitry. The integrated PID

loop measures the pressure, compares it with the setpoint, and adjusts either the

Inlet or Exhaust valve accordingly at 1000 mes per second.

The response me of the system will depend on the size of the volume being

controlled, the operang condions, and the PID tuning of the device. The

controllers are intended for use with clean, non-corrosive gases only.

They are designed with a feed port, a process port, and an exhaust port. This

allows the controllers to raise and lower the pressure of a closed system within

the operang range of the controller without wasng gas under constant

pressure condions.

Plumbing

EPCD-Series Dual Valve Pressure Controllers are commonly ordered with

custom port locaons.

Connect your EPCD into your process via the “OUT” port of the unit. This is the

“Process” port.

Connect a supply pressure greater than the full scale pressure control range of

the device, not to exceed 150 psig, to the “IN” port.

The “VENT” port can vent to atmosphere if the applicaon is suitable, or to a

collecon network if necessary.

The pressure at the vent port should be at atmospheric pressure or below to

allow the controller to be used over its full scale range.

RS-232 / RS-485 OUTPUT AND INPUT

EPC and EPCD pressure instruments come standard with integrated mul-drop

RS-232 or RS-485 as ordered.

Flow Vision Soware

Flow Vision is an aordable soware program that interfaces with RS-232 or

RS-485 and is compable with most of the aforemenoned ow and pressure

instruments.

The graphical user interface (GUI) provides automac conguraon, session saving

for easy conguraon and experiment setup reloads, data capturing and logging

(including a graphing tool), simple script building for automang meter and control

command sequences, soware alarms and support for mulple devices.

Flow Vision SC™ is for general use with up to 26 dierent devices, while Flow

Vision MX™ is specically designed for gas mixing applicaons.

Addional Compable Programs:

Many serial communicaon type soware packages including PuTTy and LabVIEW

are also compable with these instruments. To set up serial communicaon it is

important to note which COM port the device is connected to and the baud rate on

the device (default 19200).

It may also be useful to make sure the program will move to the next line when

pressing “Enter” or “Return”. The number of data bits should be set to 8, and the

number of stop bits should be set to 1. Parity and ow control should be disabled.

Not all programs have these opons and care should be taken to determine the

proper communicaon setup with the desired program.

Sending a Command

In this secon, a command will be denoted with a dierent font. For example,

command<CR> . <CR> will be used to symbolize a carriage return. How a

carriage return is entered is dependent on the serial communicaon program

being used.

With Serial Terminal, this can commonly be accomplished by pressing “Enter”

or “Return”. Parenthesis denote a value that must be lled in by the user.

For example,(unit ID)<CR> should be changed to A<CR> when using a

device with Unit ID “A”. It may also be useful to note that commands are case

insensive. For example, A<CR> is equivalent to a<CR>.

Polling Mode

All Alicat devices are sent in Polling Mode with Unit ID A unless otherwise

requested. Polling a device will return a data frame of the current

measurements in the device in units shown on the display. See Data Format,

later in this secon, for more informaon. Each unit may be polled individually

using the command (unit ID)<CR>.

A device’s Unit ID may be changed using the command (current unit

ID)@=(desired unit ID)<CR>. The Unit ID can also be changed via the

front panel using the RS-232 / RS-485 communicaon select menu.

Care should be taken not to assign the same unit ID to more than one device on

a single COM port. Up to 26 units may be connected simultaneously as Unit IDs

between A and Z are allowed.

Streaming Mode (RS-485 units do not have streaming mode)

In Streaming Mode, a device will automacally output the data stream at a pre-

determined rate. The default rate is set to 50 ms. Only one unit on a given COM

port may be in streaming mode at a me.

To change a unit from Polling Mode to Streaming Mode, type (unit

ID)@=@<CR>. This is equivalent to changing the unit ID to “@”. If data does

not appear, check all the connecons and COM port sengs.

When sending a command to a unit in streaming mode, the ow of informaon

will not stop while the user is typing; and the typed text may not be readable

depending on the terminal sengs. If the unit does not receive a valid

command, it will ignore it. If in doubt, simply perform another carriage return

and start again.

To change a unit from Streaming Mode to Polling Mode, type @@=(unit

ID)<CR>. If entered correctly, the data stream will stop and the device will

now be in polling mode.

Data Format

The data frame on the screen represents the current measurements in the

device in the units shown on the display. By default, pressure controllers are

congured to output three columns of data

All data is displayed in the “device units” selected on the unit. Devices come

standard with units of PSIA or PSIG, depending on the type of the device.

The rst column is the unit ID. This column will be excluded if the device is in

streaming mode. The next column is pressure, and the third column will display

setpoint.

For example, suppose a controller with unit ID A was ordered with units of inHgG

and currently has a setpoint value set to 50.42 inHgG. The data frame may read:

A +50.42 50.42

Unit ID Pressure Setpoint

EPC/EPCD-Series Pressure Controller Data Format

Addional columns, including status codes, may be present to the right of the

last column.

Sending a Setpoint via RS-232 / RS-485

EPC’s can be ordered in analog input mode or in RS-232/RS-485 input mode. If

you’ve ordered the EPC in RS-232/R-S485 input mode the following secon will

provide instrucons on sending a setpoint via RS-232/RS-485.

If you’ve ordered the EPC in analog input mode and wish to change over to

RS-232/RS-485 input mode, you must read and adjust register 20 in the 16

bit programming of your EPC. Please contact the factory for instrucons

on changing from Analog to RS-232/RS-485 input mode via RS-232/RS-485

adjustment.

To send a setpoint via RS-232 / RS-485:

Method 1: Setpoint may be set as a oang point number in serial

communicaon using the setpoint command (unit ID)S(oating

point number)<CR>. For example, AS4.54<CR> changes the setpoint for

unit “A” to 4.54 in the current device units.

Method 2: The setpoint can also be set in reference to a poron of the full

scale. Type (unit ID)(integer)<CR>. Values between 0 and 64000 are

acceptable, which correspond linearly to 0 and 100% full scale ow respecvely.

Once a setpoint is accepted, the data frame will be returned with the setpoint

column changed accordingly.

The formula for performing linear interpolaon is as follows:

Value = (desired setpoint) X 64000 / (full Scale)

For example, when changing the setpoint on a 100 PSIA full scale controller to

35 PSIA, the following value should be entered:

22400 = (35 PSIA) X 64000 / (100 PSIA)

Sending a Setpoint to a Controller with Negave and Posive Range

via RS-232 / RS-485

For a controller with a negave and posive range, the setpoint command may

be sent in either of the above two methods with the following changes:

Using Method 1, a negave setpoint may be set using a negave sign in the

command. For example, AS-4.54<CR> changes the setpoint for units “A” to

-4.54 in the current device units.

Using Method 2, values between 0 and 64000 are acceptable which correspond

linearly to the minimum and maximum pressure, respecvely. The formula to

perform linear interpolaon for a negave and posive ranged controller is as follows:

Value = (desired setpoint + minimum pressure) X 64000 / (maximum pressure -

minimum pressure)

For example, when changing the setpoint on a -10 PSIG to 10 PSIG ranged

controller to -3 PSIG, the following value should be entered.

20800 = (-3 PSIG + -10 PSIG) X 64000 / 10 PSIG- (-10 PSIG)

PID Tuning your EPC and EPCD over RS-232/RS-485:

The EPC and EPCD series of pressure controllers have an integrated PID loop

that measures the pressure, compares it with the setpoint, and adjusts the valve

accordingly at 1000 mes per second. This PID tuning governs the control speed,

control stability, overshoot, and general performance of the EPC or EPCD. If

you encounter issues with valve stability, oscillaon or speed, ne tuning these

parameters may resolve the problem. Alicat controllers allow you to adjust the

Proporonal, Integral and Dierenal terms of the PID control loop.

Knowing how to change PID tuning, and knowing how to do it correctly and aain

the results you desire are two very dierent things. The following secon covers

the theory/operaonal characteriscs of the PID parameters:

The PD algorithm is the PID algorithm used on most Alicat controllers. It is divided

into two segments:

The rst compares the process value to the setpoint to generate a proporonal

error. The proporonal error is mulplied by the ‘P’ gain, with the result added to

the output valve drive.

The second operates on the present process value minus the process value during

the immediately previous evaluaon cycle.

This ‘velocity’ term in mulplied by the ‘D’ gain, with the result subtracted

from the output valve drive. The above addions to and subtracons from the

output drive register are carried over from process cycle to process cycle, thus

performing the integraon funcon automacally.

Increasing the ‘P’ gain will promote the tendency of the system to overshoot,

ring, or oscillate. Increasing the ‘D’ gain will reduce the tendency of the system to

overshoot.

The PD2I algorithm is a PID algorithm used primarily for high performance

pressure and ow control applicaons. It exhibits two basic dierences from the

PD algorithm that most controllers ulize.

1. Instead of applying a damping funcon based upon the rate of change of the

process value, it applies a damping funcon based upon the square of the rate of

change of the process value.

2. The damping funcon is applied directly to the proporonal error term before

that term is used in the proporonal and integral funcons of the algorithm.

This provides a certain amount of ‘look ahead’ capability in the control loop.

Because of these dierences, you will note the following:

1. Increasing ‘P’ gain can be used to damp out overshoot and slow oscillaons in

pressure controllers. You will know that ‘P’ gain is too high, when the controller

breaks into fast oscillaons on step changes in setpoint. On ow controllers,

too low a ‘P’ gain results in slower response mes. Too high a ‘P’ gain results in

overshoot and/or slow oscillaon. A good starng value for ‘P’ gain is 200.

2. If the unit was originally shipped with the PD2I algorithm selected, the ‘D’ gain

value should be le at or near the factory seng because it relates primarily to

the system phase lags. If you are changing from the default algorithm to the PD2I

algorithm, you should start with a ‘D’ gain value of 20.

3. The ‘I’ gain is used to control the rate at which the process converges to the

setpoint, aer the inial step change. Too low a value for ‘I’ gain shows up as a

process value that jumps to near the setpoint and then takes awhile to converge

the rest of the way. Too high a value for ‘I’ gain results in oscillaon. A good

starng value for the ‘I’ gain is 200.

MAINTENANCE AND RECALIBRATION

General: EPC and EPCD-Series controllers require minimal maintenance. The single

most important thing that aects the life and accuracy of these devices is the

quality of the gas being measured. The instruments are designed to measure clean,

dry, non-corrosive gases.

Recalibraon: The EPC device is an OEM product calibrated to NIST traceable

standards at the me of manufacture. As an OEM device there is not a factory

recommended periodic recalibraon cycle. Recalibraon can be requested at the

user’s discreon/requirement. Before calling to schedule a recalibraon, please

note the serial number on the back of the device.

Cleaning: EPC and EPCD-Series controllers require no periodic cleaning. If

necessary, the outside of the controller can be cleaned with a so dry cloth.

Avoid excess moisture or solvents.

For repair, recalibraon or recycling of this product, contact:

Alicat Scienc, Inc.

7641 N Business Park Drive

Tucson, Arizona 85743

USA

Ph. 520-290-6060

Fax 520-290-0109

email: [email protected]

Web site: www.alicat.com

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