Omega CN74000 User guide

User’s Guide

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CN74000

1

⁄32 DIN Ramp/Soak

Controllers with Fuzzy Logic

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The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves
the right to alter specifications without notice.

CONTENTS

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Wiring for Optional Inputs and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Wiring for 4 to 20mA Transmitter inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

FRONT PANEL KEY FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

NOTATION CONVENTIONS FOR THE MENUS . . . . . . . . . . . . . . . . . . . . . . . . . .10

THE HOME DISPLAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

PROGRAMMING AND OPERATION FOR RAMP / SOAK FEATURE . . . . . . . . . .11

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Program Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Ramp / Soak Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

AUTO / MANUAL OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

OPERATION OF SELF TUNE® FUNCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Option C4, Serial Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

CHANGING PROGRAMMING FOR SET POINT 2 AND ALARM . . . . . . . . . . . . .16

FACTORY DEFAULT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

ALARM TYPE AND ACTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

PRIMARY MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

SECONDARY MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

SECURE MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

DIAGNOSTIC ERROR MESSAGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-35

DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Front Page

Page 2

GETTING STARTED

Install the control as described on page 4.

1.

Wire your control following the instructions on page 5. If you are using a two-wire

2.

transmitter as an input, see the drawing and instructions on page 7. Option wiring
instructions are on page 6. Option descriptions are on page 4, and specific
instructions start on page 17.

Most controls do not need many (if any) program changes to work on your

3.

process. For best results when programming changes are necessary, make all
the necessary changes in the Secure Menu (page 26) before making changes to
the Secondary Menu (page 19). If error messages occur, check the Diagnostic
Error Messages on page 34 and 35 for help.

Take the example of a Series CN74000 that comes from the factory pr ogrammed for
type J thermocouples. Suppose for this example you wish to change the input to
type K and limit the set point range between 0° and 1000° C.

First, enter the Secure menu as instructed on page 5. Press the INDEX key until the
display shows Inp and press the DOWN ARROW until the display shows CA. Don't
forget to press the ENTER key to retain your setting.

Next, press the INDEX key to display Unit. Press the DOWN ARROW until the dis­play shows C. Press ENTER.

Next, press the INDEX key until SPL is displayed (pass the dPt and InPt selections).
Press the UP ARROW until the display shows 0. Press ENTER.

Finally, press INDEX key to display SPH. Press the DOWN ARROW until the display
shows 1000. Press ENTER.

The necessary program changes are now complete. After 60 seconds the display will
switch back to the temperature reading. If you want to return faster, press the UP
ARROW and ENTER keys (at the same time) and then press the DOWN ARROW and
INDEX keys ( again at the same time). This will 'back out' of the menu and immedi­ately display the temperature reading.

If you want to use Self T une®, Auto/Manual, or the Ramp/Soak Programmer features,
see the special sections on these items. Page numbers for these are in the Contents
section on the previous page.

Page 3

CN74

MODEL IDENTIFICATION

Alarm

0 = No
1 = Yes

Options:
C4 RS-485 Serial Communications. Allows remote computer to read and write

all control parameters.

LV 12-24 VDC/VAC 50-400 Hz power supply (control operates on low voltage

equipment).

Note: Only Option LV may be combined with another option. No other options

may be combined.

Output A

2 = 5 VDC
3 = Relay

Output B

0 = None
3 = Relay

Options

C4 = RS485
LV = Low Voltage

INSTALLATION

Mount the instrument in a location that will not be subject to excessive temperature,
shock, or vibration. All models are designed for mounting in an enclosed panel.

Select the position desired for the instrument on the panel. If more than one instru­ment is required, maintain the minimum of spacing requirements as shown on the
drawing opposite. Closer spacing will structurally weaken the panel, and invalidate
the IP66, UL type 4 rating of the panel.

Page 4

It is not necessary to remove the control chassis from the
housing for installation. If the control chassis is removed from
the housing, you must follow industry standard practice for
control and protection against Electro-Static Discharge (ESD).
Failure to exercise good ESD practices may cause damage to
the control.

Prepare the panel by cutting and deburring the required opening(s).

From the front of the panel, slide the housing through the cutout. The housing gas­ket should be flat against the housing flange before installing.

From the rear of the panel slide the mounting collar over the housing. Hold the
housing with one hand and using the other hand, push the collar evenly against
the panel until the spring loops are slightly compressed. The ratchets will hold the
mounting collar and housing in place. To remove,gently lift the ratchets and slide a
piece of heavy paper or mylar sheet under each ratchet (a business card works
well). Slide the collar off of the housing.

WIRING

Do not run thermocouple or other class 2 wiring in the same conduit as power
leads. Use only the type of thermocouple or RTD probe for which the control has
been programmed. Maintain separation between wiring of sensor, auxiliary in or
out, and other wiring. See the "Secure Menu" for input selection.

For thermocouple input always use extension leads of the same type designated
for your thermocouple.

For supply connections use No. 18 AWG wires rated for at least 75°C. Use cop­per conductors only. All line voltage output circuits must have a common discon­nect and be connected to the same pole of the disconnect.

Input wiring for thermocouple, current, and RTD; and output wiring for current, DC
SSR, and 5 VDC is rated CLASS 2.

Page 5

Control wiring is as shown.

The wiring terminals for the CN74000
are compression type. To open the
wiring terminal, turn the screw for that
terminal counterclockwise. Slide the
wire into the terminal space. While
holding the wire in place, turn the
screw clockwise to tighten. Maximum
torque is 0.424 N•m (3.75 in lb). Do
not overtighten. The wire should be held snugly in place.

Wiring for Optional Inputs and Outputs

Wire power and outputs as shown on page 5 and 6. Wiring for options is shown
below. All wiring shown below is Class 2. Shielded twisted pair is r equired for Option
C4.

DO NOT RUN SIGNAL WIRING IN THE SAME CONDUIT OR
CHASE AS THE POWER WIRING. ERRATIC OPERATION OR
DAMAGE TO THE CONTROL CIRCUITRY WILL RESULT.

OPTION
C4

Note 1:

Last control in chain must have
120 ohm ±1% resistor across 5 and 6.

Page 6

Term. 5
Note 1

Terminal 5 is line A (-)
Terminal 6 is line B (+)

Term. 6

Wiring for 4 to 20mA Transmitter Inputs

Wire power and outputs as shown above. Two-wire transmitters wire as shown
below.

For three or four wire transmitters, follow the wiring instructions provided with your
transmitter.

DO NOT WIRE THE 24 VOLT POWER SUPPLY ACROSS THE
INPUT OF THE CONTROL. DAMAGE TO THE CONTROL INPUT
CIRCUITRY WILL RESULT.

Page 7

FRONT PANEL KEY FUNCTIONS

The decimal point flashes when Self-Tune is operating.
Keys are illuminated when pressed. Key functions are as follows:

INDEX: Pressing the INDEX key advances the display to the next menu
item. May also be used in conjunction with other keys as noted below.
UP ARROW: Increments a value, changes a menu item, or selects the item
to ON. The maximum value obtainable is 9999 regardless of decimal point
placement.
DOWN ARROW: Decrements a value, changes a menu item, or selects the
item to OFF. The minimum value obtainable is -1999 regardless of decimal
point placement.
ENTER: Pressing ENTER stores the value or the item changed. If not
pressed, the previously stored value or item will be retained. The display will
flash once when ENTER is pressed.

UP ARROW & ENTER: Pressing these keys simultaneously brings up the second­ary menu starting at the alarm, tune, or cycle item (depending on programming).
Pressing these keys for 5 seconds will bring up the secure menu.

INDEX & DOWN ARROW: Pressing these keys simultaneously will allow backing

up one menu item, or if at the first menu item they will cause the display to return to
the primary menu. If an alarm condition has occurred, these keys may be used to
reset the alarm. To reset an alarm press and hold both keys for three seconds.

INDEX & ENTER: Pressing these keys simultaneously and holding them for 5 sec­onds allows recovery from the various error messages. The following menu items will
be reset:

ALiH: Alarm inhibit OPEn InP: Input error message
bAd InP: Input error message CHEC CAL: Check calibration error

Correct the problems associated with the above conditions before using
these reset keys. More than one error could be present. Caution is advised since

several items are reset at one time.

Page 8

While in the Primary or Secondary Menu, if no key is pressed for a period of 30
seconds, the display will return to the HOME position displaying the temperature
value. While in the Secure Menu, if no key is pressed for a period of 60 seconds,
the display will return to the HOME position displaying the temperature value.
Outputs are disabled (turned off) when the Secure Menu is active.

NOTE: To move to the Primary Menu quickly from any other menu, press the UP
ARROW & ENTER keys followed by pressing the INDEX & DOWN ARROW keys.

SECURITY LEVEL SELECTION

Four levels of security are provided. The display shows the current security level. To
change security levels change the password value using the UP & DOWN ARROW
keys and pressing the ENTER key. Refer to the password table (following) for the
correct value to enter for the security level desired. The SECr menu item security
level may be viewed or changed at any time regardless of the present security level.

To set the access level to, for example, 2, at the SECr menu item press the UP
ARROW key until the upper display show the password, 1101. Press the ENTER
key. The display will blink, and return with the level value, 2, in the upper display.

The password values shown in the table cannot be altered, so retain a copy of these
pages for future reference. This is the only r eference made to passwor d values in this
instruction book.

Security Level

Menu

Primary
Secondary
Secure

Primary
Secondary
Secure

Primary
Secondary
Secure

Primary
Secondary
Secure

Status

Locked
Locked
Locked

Unlocked
Locked
Locked

Unlocked
Unlocked
Locked

Unlocked
Unlocked
Unlocked

PASSWORD TABLE

Displayed Value
When Viewed

1

2

3

4

Password Value

to Enter

1110

1101

1011

111

Page 9

NOTATION CONVENTIONS FOR THE MENUS

Because of the number of features available in this control, information is included
that may not apply to your specific control. All usable features are included in this
book, but may not be used in your process. To increase clarity the following conven­tions are used:

1. Certain features, Menu Items, and functions shown in this book may or may not
appear on your control, depending on other Menu Item selections. At various places
in the Menus there are notes identifying Menu Items that "control" or "direct" other
menu items. If you are looking for a particular menu item and can't find it, check the
menu item that is its "control" for proper setting.

2. The "#" symbol is used in two ways. It is used inside a group of characters to
indicate which set point function (SP1 or SP2) is being affected. It is also used before
a group of characters of a menu item to indicate that there may be more than one
selection or value for that menu item. This is used for certain repeated items such as
in the Ramp/Soak Program section.

3. Features that apply only to Options will be printed in Italics.

THE HOME DISPLAY

The home display is the normal display while the control is operating. If no errors or
functions are active, the HOME display will indicate the Process Variable (the tem­perature, pressure, flow, RH, etc., that is being measured) on the top display and the
Set Variable (Set Point 1) on the bottom.

Items that can change the HOME display are the Auto/Manual function, the Prog
function, the PctO function, and any error message. Description of these special dis­plays follow.

If Auto/Manual is enabled, the Manual indicator lights, and the home display is
changed. The upper display continues to show the Process Variable (PV), but the
lower display changes to show the percentage of output in tenths of a percent to

99.9% (0.0 to 99.9), or 100 if 100%. The display digit to the right of the number
shows a flashing letter oto indicate that the value displayed is no longer the SV, but
percent output. The SP2 output is indicated by the use of an overline on the letter

o

. Access to the SP2 value is done by the INDEX key. See Auto/Manual Operation

on Page 13 for further information.
If Prog is turned On, the HOME display changes the SV display from SP1to the

Present Set Variable as calculated by the Ramp/Soak Programmer function. See
Programming and Operation for Ramp/Soak Feature for more information.

Page 10

If PctO (Secondary Menu) is turned On, the lower display changes to show the
active percentage of output as required to maintain SP1. The display is similar to the
Auto/Manual display above, except that the letter indicators do not flash, and the
output is displayed in whole percentages of output, not in tenths of a percent. If the
control has both SP1 and SP2, the lower display will alternate between the SP1 per­cent output and the SP2 percent output.

Error messages are listed on Page 34 and 35.

PROGRAMMING AND OPERATION FOR RAMP / SOAK FEATURE

The ramp / soak feature offers a great deal of flexibility by allowing changes in the set
point to be made over a predetermined period of time. Soak (dwell) times can be
programmed, and the alarm output relay can be programmed to open or close dur­ing any of the segments.

Theory of Operation

The CN74000 Series controls offer a very simple approach to programming a ramp.
Rather than requiring the operator to calculate an approach rate (usually in degrees
per minute), the CN74000 does the calculation internally. Thus, the operator only
needs to program the target set point and the time desired to reach that point. When
the ramp segment is executed by the control, it calculates the ramp required to move
the process from the starting value (current PV) to the desired value (programmed
SP) in the time allowed.

Soaks (or dwells) are ramp segments where the target set point is the same as the
beginning process value. This allows for multistage ramps without wasting interme­diate soak steps. Care must be taken, however, that the process does actually reach
the soak value before the soak time starts. If not, the next segment will calculate a
slope from the starting PV to the target SP. Depending on your process require­ments, this difference may be important. Make sure to test any program for desired
results before running production material.

Do not operate Self Tune while a ramp function is operating. The ramp func­tion will prevent the Self Tune from operating properly. Make sure that all
tuning is set up before operating Ramp / Soak.

Page 11

Program Setup

All of the programming for the Ramp / Soak function is done in the Secondary Menu.
You may wish to work out your program on paper before going into the programmer
menu sequence.

In the Secondary Menu INDEX to Prog and make sure that Prog is set to OFF.
INDEX to PSEt and turn On.
Skip the StAt setting (this is discussed later) and press INDEX to 1ti.
The following items repeat in the following order: 1ti, 1SP, 1AL (if alarm is pro-

grammed as an event), 2ti, 2SP, 2AL, . . . , 16ti, 16SP, 16AL. To avoid repetition
each item will only be described once.

Set 1ti to the amount of time you want for the first ramp. This value is in time units
(determined by the tbAS menu item) from 0 to 9999. Press INDEX.

Set 1SP to the target value desired for the first ramp. This value is in actual units just
like SP1. If the control is programmed for temperature, then the SP displays are in
temperature. If the control is programmed for some other engineering unit, the SP is
set in that unit.

Press INDEX to continue. If Alarm is programmed as an event, then 1AL will appear.
If you wish the Alarm contact to function for this segment, set 1AL for On. If not,
set for OFF. Press INDEX. If Alarm is not programmed as an event, then 1AL will not
appear. If 1AL is set to On, the Alarm function will be active for the entire period as
set in 1ti above.

Complete setting the segment times (2ti ... 16ti), segment set points (2SP... 16SP),
and event alarm (2AL ... 16AL) if it exists.

For unneeded or unused segments set the segment times (2ti ... 16ti) to 0, and set
the segment set points (2SP ... 16SP) to the same value as the last active set point.
Event alarms may be set to indicate "end of run" as you feel necessary.

The last menu item for the ramp / soak function is PEnd. PEnd determines what the
control does when the program has ended. You may choose to have the program
repeat (LooP), Hold the last set point (16SP), revert to the local SP1, or turn the
outputs off (OoFF).

It is important to remember that if you want the program to repeat, you must allow
the process to return to the same condition that existed when the program first start­ed. Remember that the ramp function calculates the slope by drawing a line from the
beginning PV to the ramp target set point. If the PV at the end of the program is dif­ferent than the PV at the initial start, the ramp will calculate differently.

Page 12

Ramp / Soak Operation

When you wish to start the program, enter the Secondary Menu and set the Prog
menu item to On. Return to the HOME position by waiting for the display to time out
or by pressing the UP ARROW / ENTER keys and then the DOWN ARROW / INDEX
keys.

The home display will read as it normally does. The HOLD indicator over the RUN /
HOLD key will be lit. To start the program press INDEX to display Prog. Press the
UP ARROW key to select run and press ENTER. The HOLD indicator will go out, and
the program will start.

To suspend the program at any time, INDEX to Prog, press the DOWN ARROW key
to display HOLd, and press ENTER. To resume, INDEX to Prog, press the UP
ARROW to select run, and press ENTER.

Entering the AUTO / MANUAL mode will also suspend the program operation. The
difference is that AUTO / MANUAL also puts the control into manual mode. See Auto
/ Manual Operation.

The function of the Primary Menu will change depending on the setting of the StAt
menu item in the Secondary Menu. If StAt is OFF then the Primary Menu is not
changed.

If the StAt menu item is set to On, then the Primary Menu has three additional infor­mation items added before SP1 appears. The first INDEX item, ####/ ti, displays
the time remaining in the current segment. The next INDEX item, ####/##ti, displays
the total time for the active segment (1ti...16ti). The third INDEX item, ####/##SP,
displays the segment set value (1SP...16SP). The next INDEX press resumes the
normal Primary Menu.

Page 13

AUTO / MANUAL OPERATION

The AUTO / MANUAL function allows you to manually adjust the output of the con­trol. This is normally used during process setup or start up. It can also be used for
troubleshooting. To switch from AUTO to MANUAL press INDEX to Auto. Press the
UP ARROW to select OFF and press ENTER.The MANual indicator will light and the
lower display will change from normal to showing the actual output in percent. The
value will be the actual percentage of output that was active when the key was
pressed. This is usually known as "bumpless transfer".

If you wish to change the output while in manual, press the UP ARROW or DOWN
ARROW keys to change the value, and press ENTER to retain it. It is important to
remember that the value of the display can be read as 0 to100% of the full control
output, or 0 to 100% of the range between S1OL and S1OH or S2OL and S2OH. If
APct is set for rEAL, a reading of 50% in MANUAL represents 10 mA. If APCt is set
for AdJ, then 50% in MANUAL will represent the mid point in output between S1OL
and S1OH. (Assuming S1OL is 20 and S1OH is 100 [4 to 20 mA], 50% will repre­sent 12 mA.)

To return to AUTOmatic control, press the ENTER until Auto is displayed. Press the
DOWN ARROW key to On, and press ENTER. The MANual indicator will go out, and
the set point will take over. If you want bumpless transfer back to AUTO, while in
manual, slowly change the percentage of output until the process variable matches
(or at least is close) to the set point.The further away the PV is from the set point, the
greater the "bump" or upset there will be in the output.

OPERATION OF SELF TUNE®FUNCTION

Self Tune®allows automatic selection of the necessary parameters to achieve best
control operation from your CN74000 Series control. If you ar e using the control out­put as a simple on-off function (Out1 set for OnOF), none of the following will apply.

Theory of Operation
The Self Tune function calculates the Pb1, rES, and rtE parameters under the PID

tunE selection, and the Fbnd and FrtE parameters, as shown in the Secondary

Menu. These values are determined by measuring the response of the process con­nected to the control. When Self Tune is started, the control temporarily acts as an
on-off control. While in this mode the control measures the overshoot and under­shoot of the process, and the period of the process (the time from peak value to the
next peak value). These measurements are collected over a period that lasts three
periods of overshoot and undershoot.The data collected over this time is then com­pared and calculated into final PID and Fuzzy Logic values. The effect of Fuzzy Logic

on the process is still controlled by the Fint (fuzzy intensity) setting. If Fint is 0, the
Fbnd and FrtE will be calculated, but will have no effect. The calculations for the

Page 14

PID values are the same as used in the standard Ziegler - Nichols equations that

have been recognized as standard for decades.

The only modification to the application of the Ziegler - Nichols equations is con­trolled by the dFAC menu item. This menu item controls the amount of rate (deriva-
tive) that is applied. A dFACsetting of 3 (factory default) or less allows for less damp­ing. A dFAC setting of 4 allows for critical damping as set forth in Ziegler - Nichols.
A dFAC setting of 5 or more allows over damping of the process.

Program Setup and Operation

In the secondary menu set tunE to SELF. Skip LErn and check to make sure that
dFAC is set to the desired value. Back up to LErn and set to YES. The control will

begin the Self Tune function. While the Self Tune function is active, the right hand
decimal point on the lower display will blink. When Self Tune is complete, the blink­ing will stop.

After Self Tune is complete, the tunE setting automatically switches to PID. This
allows examination and / or modification of the values calculated. We recommend
that you do not change the calculated values unless you have a firm understanding
of the parameters involved and their function. For more information on PID tuning,
please contact your supplier.

Option C4, Serial Communication.

The serial communications option allows the control to be written to and read from
a remote computer or other similar digital device. Communication is allowed through
a RS-485 (Option C4) port.

Wire the communication lines as shown on Page 6. Wiring for the RS-485 is run
from control to control in a daisy chain fashion with a termination r esistor (120 ohms)
across the transmit and receive terminals of the last control in the chain.

Select the control address and communication baud rate with the Addr and bAUd
menu items in the Secure Menu. THE BAUD RATE AND ADDRESS MENU ITEMS
WILL TAKE EFFECT ON THE NEXT POWER UP OF THE CONTROL. BE SURE TO
POWER CYCLE THE CONTROL BEFORE USING THE NEW BAUD RATE AND
ADDRESS.

In operation, you have the option of preventing a write command from the host com­puter. To prevent the host from writing to the control change the LOrE menu item in
the Secondary Menu to LOC. To allow the host to write commands to the control
set LOrE to rE. (The host does have the ability to change the LOrE state, but it is
not automatic.)

Page 15

If your system depends on constant reading or writing to and from the host, you may
wish to set the No Activity Timer (nAt) to monitor the addressing of the control. When
the LOrE is set to rE and the nAt is set to any value other than Off, the control will
expect to be addressed on a regular basis. If the control is not addr essed in the time
set by the value of nAt, then the control will display the error message CHEC LOrE.
To clear the message set LOrE to LOC.

CHANGING PROGRAMMING

FOR SET POINT 2 AND ALARM

Either Set Point 2 or the Alarm function as the second output of the CN74000. The
ordering code determines whether the second output operates as a second set
point or alarm.

When the CN74000 second output is programmed as Control, SP2 appears in the
Primary Menu and the appropriate SP2 related menu items appear in the Secondary
and Secure Menus. When the CN74000 second output is programmed as ALarm,
the alarm related menu items appear in the Secondary and Secure Menus.

If you have a control with a second output and wish to change the function of the
second output from ALarm to Control (or vice versa) use the Factory Default proce­dure.

FACTORY DEFAULT PROCEDURE

If for any reason you wish to restore the factory settings or change the function of
the second output between ALarm or Control follow the following procedure.

1. Tur n off power to control

2. Tur n on power to control

3. While control is performing SELF tESt, press and hold the INDEX and ENTER

keys.

4. The control will display the ROM ID code. Press INDEX.

5. The control will display FACt dFLt. If you wish to just restore factory settings,

Press ENTER and DOWN ARROW at the same time. The control will be reset to
the original factory settings.

6. If you wish to change the operation of the second output, press INDEX.

7. Press INDEX to display SP2. Select Cont or AL.

Cont Uses SP2 menu items for second output.
AL Uses ALarm menu items for second output.

8. Press INDEX to display OPt. If your control is equipped with an option, press the

UP ARROW to display the option number. If the number is flashing, press
ENTER. An enabled option does not flash.

9. Press INDEX to display ACPt. Select YES or no.

YES Changes are accepted and control re-boots.
no Changes are discarded and control re-boots.

Page 16

ALARM TYPE AND ACTION

Caution: In any critical application where failure could cause
expensive product loss or endanger personal safety, a redun­dant limit controller is required.

The CN74000 Series allows Set Point 1 (and Set Point 2 is equipped) to operate as
limit or alarm type outputs. This function is available on all outputs except the pro­portional current (output type 5). To enable a set point output to act as an alarm or
limit, Out1 (for SP1) or Out2 (for SP2, if equipped) should be set for OnOf.

When Out1 and / or Out2 are set to OnOF, then the alarm function menu items will
appear in the Secure Menu for the selected set point(s).

If the Alarm Programming code in the model number is set to 1, then set point 2 is
pre-programmed as an alarm. If the alarm Programming code in the model number
is set to 0 and the last number of the model number is not 0 then the second set
point is pre-programmed as a cooling output. This programming may be changed in
the field with the Factory Default procedure.

When setting SP2 value (S2t = AbS) or the ALLO and ALHi values (ALt = AbS) for
an absolute alarm, simply set the value at which the alarm is to occur.

When setting SP2 value (S2t = dE) or the ALLO and ALHi values (ALt = dE) for a
deviation alarm, set the difference in value from the Set Point 1 (SP1) desired. For
example if a low alarm is required to be 5 degrees below the SP1, then set SP2 or

ALLO to -5. If a high alarm is required 20 degrees above the SP1, then set SP2 or
ALHi to +20. If SP1 is changed, the alarm ( SP2, ALLO, ALHi) will continue to hold

the same relationship as originally set.
When Set Point Power Interrupt (S#Pi) or Alarm Power Interrupt (ALPi), is pro-

grammed ON and Set Point Reset (S#rE) or Alarm Reset (ALrE), is programmed for
Hold, the alarm will automatically reset after a power failure and on subsequent
power restoration if no alarm condition is present.

If Set Point Inhibit (S#iH) or Alarm Inhibit (ALiH), is selected ON, an alarm condition
is suspended upon power up until the process value passes through the alarm set
point once. Alarm inhibit can be restored as if a power up took place by pressing
both the INDEX and ENTER keys for 5 seconds.

Page 17

Warning: Resetting a high set point inhibit will not cause an
alarm to occur if the Process V alue does not first drop below the
high set point value. Do not use the Set Point Inhibit feature if a
hazard is created by this action. Be sure to test all combina­tions of high and low set point inhibit actions before placing
control into operation.

Serial Communications

Options and Non-volatile Memory

There are many different types of memory used in computer driven devices. The
terms RAM (random access memory) and ROM (read only memory) are a couple
with which you may be familiar.

RAM is used in computers to run programs and hold data for a short period of time.
This is the memory that is used primarily in PCs. RAM is very fast and can be read
and written to over and over again.

ROM is used in computers to hold the ‘permanent’ programming that allows a PC
to start. This memory is ‘burned in’ to the chip itself and can not be changed. Unlike
RAM, however, this memory is permanent. While it can not be changed, it can not
lose its programming when power is turned off.

There is a third type of memory that is now currently used to combine the character­istics of both RAM and ROM. This is known as EEPROM (electrically erasable pro­grammable read only memory). While the name may be long and somewhat cryptic,
the EEPROM can be erased and re-written many times, and yet hold the pro­grammed data even over long periods of time when the power is off. This is the type
of memory that all Omega products use to save the settings your program in your
control. The reliability and longevity of the data retention is what allows us to guar­antee a 10 year data retention without power.

In normal operation, the control uses RAM, just as any other computerized device.
Whenever you make a change to one of the parameters in the control, the set point
for example, the new value is written into the EEPROM. This way, if power goes off
for whatever reason, when power resumes, the latest settings are preserved. When
power is turned on, the data is copied from the EEPROM to the RAM to begin oper­ation.

If EEPROM is such a wonderful thing, you might ask, why bother with RAM? One
reason is that RAM is much faster than EEPROM. Faster speed gives you better per­formance in critical control functions.

Page 18

Perhaps the most important reason is that EEPROM has a limit to the number of
times it can be erased and re-written. Current technology now sets that limit at about
one million erase/write cycles. In a dynamic control situation, it may be necessary to
update RAM every few milliseconds. EEPROM can not keep up to that pace, and,
even if it could, it would be ‘used up’ in a matter of days.

If you think about how long it would take a million changes to the control program­ming through the front key pad, you will see that it would take a very long time to get
to use up the life of the EEPROM.

Adding one of the computer communications options (e.g. C4, LV) changes the pic­ture. The speed of computer communications is such that hundreds of instructions
can be made in less than a minute. In such a situation, the million erase/write cycles
could be used up in a couple of months causing the control to fail.

Usually in such a situation, the control is under close observation by the host com­puter. It may not be necessary, then to the data written to the EEPROM, as it is ‘tran­sitory’ in nature (changing set points for a ramp/soak sequence for example).

All CN74000 Series controls with communications options made before April 2001
are only able to write to the EEPROM. Controls manufactured after this date have a
menu item in the Secure menu (Stor) that allows the serial communications to write
to RAM (Stor = no) with a special write command that allows to EEPROM to be
updated or written directly to EEPROM (protocol command 0442).

The factory default is ‘write to EEPROM’ (Stor = YES).
If your computer system will be making frequent changes to the control we strongly

recommend that you select the ‘write to RAM’ parameters (Stor = no). If you are pri­marily reading from the control, there is no need to change the setting.

Any instruments equipped with any Serial Communications are
limited to one million WRITE cycles to the EEPROM through the
Serial Communications Port. Exceeding this limit will generate
a FAIL TEST error . Ther e is no limit to the number of times you can
READ from this instrument EEPROM.

Make sure that the software you use does not write too often to the instrument.
If you have any questions regarding how your software works with the instrument(s),

contact your System Administrator, Programmer, or Software Supplier.

Page 19

MENU SELECTIONS

PRIMARY MENU
Press INDEX to advance to the next menu item. Press UP ARROW or DOWN
ARROW to change the value in the display. Press ENTER to retain the value.

If StAt (Secondary Menu ) is On, the three program status menu items will appear.
ti Time remaining for current segment.

##ti Total run time for segment ##.
##SP Target Set Point for segment ##.

If StAt (Secondary Menu ) is OFF, the Primary menu operates as follows:
SP1 Set Point 1 Adjust, Control Point 1.

SP2 Set Point 2 Adjust (if equipped), Control Point 2.
Auto Auto/Manual Station, Select On or OFF.

On Output operation is automatic (normal operation).
OFF Output is controlled manually.

See Page 13 for operation of Auto/Manual Station Feature.

If Prog is OFF in the Secondary Menu, Prog (below) will not appear.

Prog Ramp/Soak Programmer Run/Hols function, Select run or HoLd.

run Ramp/Soak Programmer is in operation.
HoLd Ramp/Soak Programmer is on hold.

SECONDARY MENU
Hold UP ARROW & ENTER. Press INDEXto advance to the next menu item. Press
UP ARROW or DOWN ARROW to change the value in the display. Press ENTER

to retain the value.
If the control is not equipped with alarm, or if the alarm functions (AL) are turned OFF

or programmed as event (Eunt), ALLO and ALHi will not appear.
ALLo Alarm Low: The Low Alarm point is usually set below the Set Point. May not

appear depending on AL setting in Secure Menu.
ALHi Alarm High: The High Alarm Point is usually set above the Set Point. May not

appear depending on AL setting in Secure Menu.

Page 20

Out1 Output selection: Select OnOf, 1tP, 1PuL, or ProP.

ONOF A setting of ONOF allows the control to operate as a simple

on/off mode. This setting forces the control to turn off at set point,
and on at the set point plus the differential (SP_d). When selected,
the Out1/OnOF menu item is followed by ####/SP1d, and the
tunE, Pb, rES, OFS, rtE, and ArUP selections in the Secondary
menu and the S1OL and S1OH selections in the Secure menu are
suppressed.
SP_d Set Point On-Off Differential (hysteresis). Select 1 to 9999
(direct acting), or -1 to -9999 (reverse acting). This value will be
negative for reverse acting set points, and positive for direct acting
outputs. Set the value for the amount of difference between the
turn off point (set point) and the turn on point. The following
drawing shows output behavior for reverse and direct action.

##tP T ime Proportioning Cycle Time. Select 1tP to 80tP.

1tP A setting of 1tP is recommended for solid state outputs

(SSR or 15VDC).

2tP to 80tP T ime Proportioning Control is adjustable in 1 second

steps. Recommended for mechanical outputs (relays,
solenoids, etc.). For best contact life, a time should be
selected as long as possible without causing the process to
wander.

#PuLPulsed Time Proportioning Output: Select 1PuL to
7PuL. 1PuL = Linear and 7PuL = most nonlinear. Changes

output linearity for use in cooling applications or for an
extremely fast response processes. At the center of the
proportional band, a pulse value of 1 provides an output of
one second on and one second off (50% output). A pulse
value of 2 provides an output of one second on and two
seconds off (33% output). Output at center of band equals
one second on, 2

(pulse value-1)

seconds off.

ProP For Current (Code 5) outputs only.

Page 21

The following menu items apply only if your control is equipped with a sec­ond set point (last digit of model number is not zero and Alarm Programming
code is zero). If your control does not have a second set point or if the sec­ond output is programmed as Alarm, jump to the"tunE" menu on the follow­ing pages.

Out2 Output selection: Select OnOf, 2tP, 2PuL, or ProP.

ONOF A setting of ONOF allows the control to operate as a simple on/off

mode. This setting forces the control to turn off at set point, and on at the set
point plus the differential (SP2d). When selected, the Out2/OnOF menu item
is followed by ####/SP2d, and the Pb2 selection in the Secondary menu
and the S2OL and S2OH selections in the Secure menu are suppressed.

SP2d Set Point On-Off Differential (hysteresis). Select 1 to 9999
(direct acting), or -1 to -9999 (reverse acting). This value will be
negative for reverse acting set points, and positive for direct acting
outputs. Set the value for the amount of difference between the turn
off point set point) and the turn on point. The drawing on the
previous page (See SP1d) shows output behavior for reverse and
direct acting.

##tP T ime Proportioning Cycle Time. Select 1tP to 80tP.

1tP A setting of 1tP is recommended for solid state outputs

(SSR or 15VDC).

2tP to 80tP T ime Proportioning Control is adjustable in 1 second

steps. Recommended for mechanical outputs (relays,
solenoids, etc.). For best contact life, a time should be
selected as long as possible without causing the process to
wander.

#PuL Pulsed Time Proportioning Output: Select 1PuL to
7PuL. 1PuL = Linear and 7PuL = most nonlinear. Changes

output linearity for use in cooling applications or for an
extremely fast response processes. At the center of the
proportional band, a pulse value of 1 provides an output of
one second on and one second off (50% output). A pulse
value of 2 provides an output of one second on and two
seconds off (33% output). Output at center of band equals
one second on, 2

(pulse value-1)

seconds off.

Page 22

tunE Tuning Choice: Select SELF, Pid, SLO, nor, or FASt.

SELF The Controller will evaluate the Process and select the PID

values to maintain good control. Active for SP1 only.

LErn Select YES or no

YES Start Learning the Process. After the

process has been learned the menu item
will revert to no.

no Lear ning will stay in present mode.

dFAC Damping factor, Select OFF, 1 to 7. Sets the ratio

of Rate to Reset for the SELF tunE mode. 7 = most
Rate. Factory set to 3. For a fast response process
the value should be lowered (less Rate). For a
slower process the value should be increased
(more Rate).

Pid Manually adjust the PID values. PID control consists of three basic

parameters, Proportional Band (Gain), Reset Time (Integral), and
Rate Time (Derivative).

Pb1 Proportional Band (Bandwidth). Select 1 to 9999 °F, °C,

or counts.

Pb2 Proportional Band (Bandwidth). Select 1 to 9999 °F, °C, or

counts. Appears only if control is equipped with second set
point and Out2 is NOT selected as ONOF.

rES Automatic Reset T ime. Select OFF, 0.1 to 99.9 minutes.

Select OFF to switch to OFS.

OFS Manual Offset Correction Select OFF, 0.1 to 99.9%. Select

OFF to switch to rES.

rtE Rate Time. Select OFF, 0.01 to 99.99 minutes, Derivative.
SLO PID values are preset for a slow response process.
nor PID values are preset for a normal response process.
FASt PID values are preset for a fast response process.

Pid2 Linkage of PID parameters between SP1 and SP2: Select On or OFF.

On Applies SP1 rEs, rtE, Fbnd, and FrtE terms to SP2 for

heat/cool applications.
OFF SP2 functions without rEs, rtE, Fbnd and FrtE.

Does not appear if not equipped with second output or if second

output is programmed as alarm.

ArUP Anti- Reset Windup Feature: Select On or OFF.

On When ArUP is On the accumulated Reset Offset value will be

cleared to 0% when the process input is not within the Proportional

Band.
OFF When ArUP is OFF, the accumulated Reset Offset Value is retained

in memory when the process input is not within the Proportional

Band.

Page 23

ArtE Approach Rate Time: Select OFF, 0.01 to 99.99 minutes. The function

defines the amount of Rate applied when the input is outside of the
Proportional Band. The ArtE time and the rtE time are independent and have
no effect on each other. To increase damping effect and reduce overshoot
set the approach rate time for a value greater than the natural rise time of
the process (natural rise time = process value time to set point).

Fint Fuzzy Logic Intensity: Select 0 to 100%. 0% is OFF (disables Fuzzy Logic).

The function defines the amount of impact Fuzzy Logic will have on the out
put. If Fint is set to 0, Fbnd and Frte below will not appear.

Fbnd Fuzzy Logic Error Band: Select 0 to 4000 °F, °C, or counts. Sets the band

width of the Fuzzy Logic. Set Fbnd equal to PID proportional band (Pb1)
for best results. Will not appear if Fint is OFF.

FrtE Fuzzy Logic Rate of Change: Select 0.00 to 99.99 counts/second. For best

initial setting, find the count/second change of process value near set point
1 with output ON 100%. Multiply this value by 3. Set FrtE to this
calculated value. Will not appear if Fint is OFF.

PEA The Peak feature stores the highest input the control has measured since

the last reset or Power On. At Power On PEA is reset to the present input.
To manually reset the value PEA must be in the lower display. Press the

ENTER key to reset. PEA will be reset and display the present input value.

UAL The Valley feature stores the lowest input the Instrument has measured

since the last reset or Power On. At Power On UAL is reset to the present
input. To manually reset the value UAL must be in the lower display. Press
the ENTER key. UAL will be reset and display the present input value.

PctO Percent Output Feature: Select On or OFF.

On When selected On, the HOME lower display will indicate the output

of the controller in percent. An “o” will appear in the right hand side

of the lower display to indicate percent output for SP1. An "o" will

appear on the right hand corner of the lower display to represent

percent output for SP2, if the control is so equipped.The display will

alternate between these values.

OFF Percent Output display is disabled.

Prog Ramp/Soak Feature: Select On or OFF

On Allows Programmed Ramp/Soak function to be started by the

Run/Hold key on the control front panel.

OFF Tur ns Ramp/Soak function OFF and resets program to beginning.

PSEt Programmer function set. Select On or OFF.

OFF Skip Ramp/Soak Programming. Go to next Secondary Menu Item,

In PC on the next page.
On Enable Ramp/Soak Programming.

Page 24

StAt Programmer Status Display in the Primary Menu when Prog (above) is On:

Select On or OFF.

OFF The Primary Menu operates as normal.
On The Primary Menu is altered to have the following items inserted

before the SP1 menu item: ####/ti (time remaining in segment),

####/##ti (total time in active segment), and ####/##SP (segment

target set point).

tbAS Ramp/Soak T ime Base. Select 1_S or 60_S.

1_S Ramp/Soak time base is in 1 second increments. Program time

1ti...16ti is measured in seconds.
60_S Ramp/Soak time base is in 60 second increments (minutes).

Program time 1ti...16ti is measured in minutes.

The following items repeat in the following order: 1ti, 1SP, 1A1 (if alarm 1 is
programmed as an event), 2ti, 2SP, 2A1, . . . , 16ti, 16SP,16A1. To avoid rep­etition each item will only be described once.

1ti Segment Time: Select 0 to 9999 units (minutes if tbaS is set to 60_S,

seconds if tbaS is set to 1_S.

1SP Segment Set Point: Select as desired.
1AL Segment Alarm Event: Select On or OFF .

On Alarm is active during segment 1 time (1ti).
OFF Alarm is inactive during segment 1 time (1ti).

PEnd Program End action: Select Hold or OoFF.

Hold Stay at the Present Set Point (16SP).
OoFF Turn Off SP1 and SP2 Outputs at the end of the program.
LooP Repeat program starting at 1ti.
SP1 Revert to SP1 value.

InPC Input Correction: Select ±500 °F, °C, or counts. This feature allows the input

value to be changed to agree with an external reference or to compensate
for sensor error. Note: InPC is reset to zero when the input type is
changed, or when decimal position is changed.

FiLt Digital Filter: Select OFF, 1 to 99. In some cases the time constant of the

sensor, or noise could cause the display to jump enough to be unreadable.
A setting of 2 is usually sufficient to provide enough filtering for most cases,
(2 represents approximately a 1 second time constant). When the 0.1
degree resolution is selected this should be increased to 4. If this value is set
too high, controllability will suffer.

LPbr Loop Break Protection: Select OFF, 1 to

9999 seconds. If, during operation,

the output is minimum (0%) or maximum (100%), and the input moves less
than 5°F (3°C) or 5 counts over the time set for LPbr, the LOOP bAd
message will appear. This condition can also be routed to an Alarm
Condition if alarms are present and turned On (see ALbr in the secure
menu). The loop break error can be reset by pressing the ENTER key when
at the LPbr menu item. The INDEX & ENTER keys may also be used.

Page 25

LOrE (Option C4, Serial Communications) Local / Remote Status: Select

LOC or rE.
LOC The host computer is advised not to send remote commands. Any

write commands sent to the controls will be rejected.
rE The host computer is allowed to send write commands. If the

control is not addressed within the time set in the nAt (No Activity

Timer, see Secure Menu) the CHEC LorE error message will be

displayed.
Addr (Option C4, Serial Communications) Control Address: Set from1 to

3FF. This number (hexadecimal, base 16) must match the address

number used by the host computer. Viewed only in this menu. To

change this parameter, see Addr in the Secure Menu.

SECURE MENU

Hold UP ARROW & ENTER for 5 Seconds. Press INDEX to advance to the next
menu item. Press UP ARROW or DOWN ARROW to change the value in the dis­play. Press ENTER to retain the value.

OUTPUTS ARE DISABLED (TURNED OFF) WHILE CONTROL IS IN SECURE
MENU.

SECr Security Code: See the Security Level Selection and the Password Table in

this manual, in order to enter the correct password.

InP Input Type: Select one of the following. Refer to the Input wiring section for

the proper wiring.

J-IC Type “J” Thermocouple

CA Type “K” Thermocouple

E- Type “E” Thermocouple

t- Type “T” Thermocouple

L- Type “L” Thermocouple

n- Type “N” Thermocouple

r-13 Type “R” Thermocouple

S-10 Type “S” Thermocouple

b- Type “B” Thermocouple

C- Type “C” Thermocouple

P392 100 ohm Platinum (NIST 0.00392 /°C)

n120 120 ohm Nickel

P385 100 ohm Platinum (DIN 0.00385 /°C)

1P38 1000 ohm Platinum (DIN 0.00385 /°C)

Curr DC Current Input 0.0 to 20.0 or 4.0 to 20.0 mA.

VoLt DC Voltage Input 0.0 to 5.0 or 1.0 to 5.0 volts.

diFF DC Voltage Input -10 to +10 mV.

---- Reserved

OSUP Zero Suppression: Select On or OFF. Only with Current and Voltage input

types.

OFF The input range will start at 0 (zero) Input.
On The input range will start at 4.00 mA or 1.00 V.

Page 26

Unit F, C or None.

F °F descriptor is On and temperature inputs will be displayed in

actual degrees Fahrenheit.
C °C descriptor is On and temperature inputs will be displayed in

actual degrees Celsius.
nonE °F and °C descriptors will be Off. This is only available with Current

and Voltage Inputs.

dPt Decimal Point Positioning: Select 0, 0.0, 0.00, or 0.000. On temperature

type inputs this will only effect the Process Value, SP1, SP2, ALLo, ALHi,
and InPC. For Current and V oltage Inputs all Menu Items r elated to the Input
will be affected.

0 No decimal Point is selected. This is available for all Input Types.

0.0 One decimal place is available for Type J, K, E, T, L, RTD’s, Current

and Voltage Inputs.

0.00 Two decimal places is only available for Current and Voltage Inputs.

0.000 Three decimal places is only available for Current and Voltage

Inputs.

InPt Input Fault T imer: Select OFF, 0.1 to 540.0 minutes. Whenever an Input is

out of range (UFL or OFL displayed), shorted, or open the timer will start.
When the time has elapsed, the controller will revert to the output condition
selected by InPb below. If OFF is selected, the Input Fault Timer will not be
recognized (time =infinite).

InPb Input Fail Action: Select FAIL, AVE, or PrE. When the Input is out of range

(UFL or OFL displayed) and the Input timer (InPt) time has elapsed, the
controller will revert to the selected condition.

FAIL Outputs are disabled (go to 0% output).
AVE The outputs will hold at the last known average percentage of

output.
PrE The outputs will maintain a preprogrammed percentage of output

as specified in PrE1 and PrE2.

PrE1 Preset output for Set Point 1. Select 0 to 100%.

PrE2 Preset output for Set Point 2. Select 0 to 100%.

APCt Manual and PctO display adjustment. Select rEAL or AdJ.

rEAL Manual display will display output 0 to 100% relative to actual range

of the output.
AdJ Manual display will display output 0 to 100% relative to the S#OL

and S#OH settings.

SEnC Sensor Rate of Change: Select OFF, 1 to 4000 °F, °C, or counts per 1

second period. This value is usually set to be slightly greater than the fastest
process response expected during a 1 second period, but measured for at
least 2 seconds. If the process is faster than this setting, the SEnC bAd
error message will appear. The outputs will then be turned off. This function
can be used to detect a runaway condition, or speed up detection of an
open thermocouple. Use the INDEX & ENTER keys to reset.

Page 27

SCAL Scale Low: Select 100 to 9999 counts below SCAH. The total span

between SCAL and SCAH must be within 11998 counts. Maximum setting
range is -1999 to +9999 counts. For Current and V oltage inputs, this will set
the low range end. Viewable only for Thermocouple and RTD ranges.

SCAH Scale High: Select 100 to 9999 counts above SCAL. The total span

between SCAL and SCAH must be within 11998 counts. Maximum setting
range is -1999 to +9999 counts. For Current and V oltage inputs, this will set
the high range end. Viewable only for Thermocouple and RTD ranges.

SPL Set Point Low: Select from the lowest input range value to SPH value. This

will set the minimum SP1 or SP2 value that can be entered. The value for
SP1 or SP2 will not stop moving when this value is reached.

SPH Set Point High: Select from the highest input range value to SPL value. This

will set the maximum SP1 or SP2 value that can be entered. The value for
SP1 or SP2 will not stop moving when this value is reached.

SP1O Set Point 1 Output Select: Select OutA or Outb.

OutA Set Point 1 is routed through Output A, Set Point 2 (if equipped) is

routed through Output B. Setting is forced to OutA if control is

equipped with single output or if second output is programmed as

alarm.
Outb Set Point 1 is routed through Output B, Set Point 2 (if equipped) is

routed through Output A.

S1St Set Point 1 State: Select dir or rE.

dir Direct Action. As the input increases the output will increase. Most

commonly used in cooling processes.
rE Reverse Action. As the input increases the output will decrease.

Most commonly used in heating processes.

If Out1 is set for ##tP, #PUL, or ProP, then S1OL and S1OH (following) appear. If

Out1 is set for ONOF, then skip to S1rE.
S1OL Set Point Output Low Limit: Select 0 to 100% but not greater than S1OH.

This item limits the lowest output value. This is useful for adding a bias to
the process when needed. Factory set to 0 for output codes 1,2, and 3.
Factory set to 20 for output code 5 (20% output equals 4 mA output).

S1OH Set Point 1 Output High Limit: Select 0 to 100% but not less than S1OL for

output codes 1, 2, or 3. Select 0 to 102% but not less than S1OL for
output code 5. This item allows setting the maximum output limit. This is
useful with processes that are overpowered. Adjustment to 102% allows
setting current output to force a full on condition for output devices which
do not have bias adjustments. Factory set to 100 for all output codes.

If Out1 is set for ##tP, #PUL, or ProP, then skip to S1LP on next page.

S1rE Set Point 1 Reset. Select OnOF or Hold.

OnOF Control will automatically reset when process passes back through

Page 28

SP1d.

HoLd Manual Reset. Reset (acknowledge) by simultaneously pressing the

INDEX & DOWN ARROW keys for 5 seconds.

S1Pi Set Point 1 Power Interrupt. Select On or OFF.

On Alarm Power Interrupt is On. Control will automatically reset on

power-up if no alarm condition exists.
OFF Alarm Power Interrupt is OFF. Control will power-up in alarm

condition regardless of condition of process.

S1iH Set Point 1 Inhibit: Select On or OFF.

On Alarm Inhibit is On. Alarm action is suspended until the process

value first enters a non-alarm condition.

OFF Alarm Inhibit is OFF.

S1LP Set Point Lamp: Select O on or OoFF.

O on Lamp ON when Output is ON.
OoFF Lamp OFF when Output is ON.

If your control is not equipped with a second output or if the second output
is programmed as an alarm, then proceed to the alarm section (next page).

S2t Set Point 2 type: Select Abs or dE.

AbS Absolute SP2. SP2 is independent of SP1, and may be set

anywhere between the limits of SPL and SPH.
dE Deviation SP2. SP2 is set as a deviation from SP1, and allows SP2

to retain its relationship with SP1 when SP1 is changed (tracking

SP2).

S2St Set Point 2 State: Select dir or rE.

dir Direct Action. As the input increases the output will increase. Most

commonly used in cooling processes.
rE Reverse Action. As the input increases the output will decrease.

Most commonly used in heating processes.

If Out2 is set for ##tP, #PUL, or ProP,then S2OL and S2OH (following) appear. If

Out2 is set for ONOF, then skip to S2rE.
S2OL Set Point Output Low Limit: Select 0 to 100% but not greater than S2OH.

This item limits the lowest output value. This is useful for adding a bias to
the process when needed. Factory set to 0 for output codes 1,2, and 3.
Factory set to 20 for output code 5 (20% output equals 4 mA output).

S2OH Set Point 1 Output High Limit: Select 0 to 100% but not less than S2OL for

output codes 1, 2, or 3. Select 0 to 102% but not less than S2OL for
output code 5. This item allows setting the maximum output limit. This is
useful with processes that are overpowered. Adjustment to 102% allows
setting current output to force a full on condition for output devices which
do not have bias adjustments. Factory set to 100 for all output codes.

Page 29

S2rE Set Point 2 Reset. Select OnOF or Hold.

OnOF Control will automatically reset when process passes back through

SP2d.
HoLd Manual Reset. Reset (acknowledge) by simultaneously pressing the

INDEX & DOWN ARROW keys for 5seconds.

S2Pi Set Point 2 Power Interrupt. Select On or OFF.

On Alarm Power Interrupt is On. Control will automatically reset on

power-up if no alarm condition exists.
OFF Alarm Power Interrupt is OFF. Control will power-up in alarm

condition regardless of condition of process.

S2iH Set Point 2 Inhibit: Select On or OFF.

On Alarm Inhibit is On. Alarm action is suspended until the process

value first enters a non-alarm condition.

OFF Alarm Inhibit is OFF.

S2LP Set Point 2 Lamp: Select O on or OoFF.

O on Lamp ON when Output is ON.
OoFF Lamp OFF when Output is ON.

The following menu item applies only to the alarm when programmed.

AL Alarm function: Select OFF, Lo, Hi, HiLo, or Evnt.

OFF Alarm is disabled. No Alarm menu items appear in the Secondary

or Secure menus.

Lo Low Alarm Only. ALLo appears in the Secondary Menu.
Hi High Alarm Only. ALHi appears in the Secondary Menu.
HiLo High and Low Alarms. Both ALLo and ALHi appear in the

Secondary Menu, and share the same Alarm Relay output.
Evnt Alarm is controlled by the Ramp/Soak program function. See pages

11-13 (#AL) for further information.

If AL is set to OFF and the control is not equipped with options, the Secure Menu
ends. If AL is set to OFF or the second output is programmed as control, and the
control is equipped with options, proceed to Addr.

If AL is set to Evnt, go to ALSt

ALt Alarm Type: Select AbS or dE

AbS Absolute Alarm that may be set anywhere within the values of

SCAL and SCAH and is independent of SP1.
dE Deviation Alarm that may be set as an offset from SP1. As SP1 is

changed the Alarm Point will track with SP1. A deviation alarm will

also track any active ramp or soak set point.

Page 30

ALrE Alarm Reset: Select OnOF or Hold.

OnOF Automatic Reset.
Hold Manual Reset. Reset (acknowledge) by simultaneously pressing the

INDEX & DOWN ARROW keys for 5 seconds.

ALPi Alarm Power Interrupt: Select On or OFF.

On Alarm Power Interrupt is On.
OFF Alarm Power Interrupt is OFF.

ALiH Alarm Inhibit: Select On or OFF.

On Alarm Inhibit is On. Alarm action is suspended until the process

value first enters a non-alarm condition.

OFF Alarm Inhibit is OFF.

ALSt Alarm Output State: Select CLOS or OPEn.

CLOS Closes Contacts at Alarm Set Point.
OPEn Opens Contacts at Alarm Set Point.

ALLP Alarm Lamp: Select O on or OoFF.

O on Alarm Lamp is ON when alarm contact is closed.
OoFF Alarm Lamp is OFF when alarm contact is closed.

ALLb Alarm Loop Break. Select On or OFF.

On Loop Break Condition will cause an Alarm Condition.
OFF Loop Break will not affect the Alarm Condition.

Addr (Option C4, Serial Communications) Control Address: Set from 1 to 3FF.

This number (hexadecimal, base 16) must match the address number used
by the host computer.

bAUd (Option C4, Serial Communications) Communication Baud Rate: Select

300, 1200, 2400, 4800, 9600, or 19200. This number must match the

baud rate used by the host computer.

nAt (Option C4, Serial Communications) No Activity Timer: Set from OFF or 1

to 99 minutes.
1 - 99 Maximum time between host computer accesses. If timer counts
to 0, CHEC/LorE will be displayed.

OFF No Activity Timer function is disabled.

Stor (Option C4, Serial Communications) Store to EEPROM: Select YES or no.

(See additional information on page 21).
YES Menu Items changes made through the Serial Communications are

stored directly to the EEPROM.
no Menu items changes made through the Serial Communications are

stored directly in RAM.

Page 31

SPECIFICATIONS

Selectable Inputs: Thermocouple, RTD, DC Voltage, or DC Current selectable.
Input Impedance:

Thermocouple = 3 megohms minimum. RTD current = 200µA.
Current = 10 ohms. Voltage = 5000 ohms.

Sensor Break Protection: De-energizes control output to protect system after cus­tomer set time. (See InPt in Secondary Menu.)

Set Point Range: Selectable (See Range Chart Page 39).
Display: Two 4 digit, 7 segment 6.35 mm (0.25") high LEDs.
Control Action: Reverse (usually heating), Direct (usually cooling) selectable.
Proportional Band: 1 to 9999 °F, °C, or counts.
Reset Time (Integral): Off or 0.1 to 99.9 minutes.
Rate Time (Derivative): Off or 0.01 to 99.99 minutes.
Cycle Rate: 1 to 80 seconds.
On - Off Differential: Adjustable 1° F, 1° C, or 1 count to full scale in 1° F, 1° C,

or 1 count steps.

Alarm On - Off Differential: 1° F, 1° C, or 1 count.
Fuzzy Percent: 0 to 100%.
Fuzzy Rate: Off or 0.01 to 99.99 minutes.
Fuzzy Band: Off or 1 to 4000 °F, °C, or counts.
Accuracy: ±0.25% of span, ±1 least significant digit.
Resolution: 1 degree or 0.1 degree, selectable.
Line Voltage Stability: ±0.05% over the supply voltage range.
Temperature Stability: 4µV/°C (2.3 µV/°F) typical, 8 µV/°C (4.5 µV°F) maximum

(100 ppm / °C typical, 200 ppm / °C maximum).

Common Mode Rejection: 140 db minimum at 60 Hz.
Normal Mode Rejection: 65 db typical, 60 db at 60 Hz.
Isolation:

Relay outputs: 1500 Vac to all other inputs and outputs.
SP1 Switched Voltage outputs: Non-isolated, shares common ground

with input.

Supply Voltage: 100 to 240 Vac, nominal., +10 -15%, 50 to 400 Hz. single phase;
132 to 240 Vdc, nominal., +10 -20%.

Supply Voltage (LV): 12 to 24 Vdc, Vac 40-400 Hz, ±20%.
Power Consumption: 5VA maximum.
Operating Temperature: -10 to +55 °C (+14 to 131 °F).
Storage Temperature: -40 to +80 °C (-40 to 176 °F).
Humidity Conditions: 0 to 90% up to 40 °C non-condensing, 10 to 50% at 55 °C

non-condensing.

Memory Backup: Nonvolatile memory. No batteries required.
Control Output Ratings:

Relay (Output A, Output B): SPST, 3 A @ 240 Vac resistive; 1.5A@240

Vac inductive; 1/10 HP @ 120 Vac.

Switched Voltage (non-isolated, Output A, Output B): 5 Vdc @20 mA.

Panel Cutout: 45.0 mm x 22.2 mm (1.

772" x 0.874").

Depth Behind Mounting Surface: 111.6 mm (4.395").
Weight: 114 g (4 oz).

Agency Approvals:
Front Panel Rating: Type 4, IP66.

Page 32

DIAGNOSTIC ERROR MESSAGES

DISPLAY

UFL

or

OFL

bAd

InP

OPEn

InP

LOOP

bAd

MEANING

Underflow or
Overflow: Process
value has exceeded
input range ends

UFL or OFL will
sequence to display
one of these mes­sages if the InPt is
set for a time value.

For RTD inputs RTD
is open or shorted.

For THERMOCOU­PLE inputs thermo­couple is open.

The sensor may be
defective, heater fuse
open, heater open,
or the final power
output device is bad.

SP OUTPUTS ACTION REQUIRED

Set point outputs
active
Alarm active.

Set point outputs
inactive
Alarm active.

Set point outputs
inactive
Alarm active.

Input signals may normally
go above or below range
ends. If not, check input
and correct.

To reset use the INDEX
and ENTER keys. When
InPt (input fault timer) has
been set for a time, the
outputs will be turned off
after the set time. Setting
the time to OFF causes
the outputs to remail ac­tive, however UFL or OFL
will still be displayed.
Correct or replace sensor.
To reset use the INDEX &
ENTER keys.

Correct or replace sensor,
or any element in the con­trol loop that my have
failed. Correct the prob­lem, and reset the control
by pressing INDEX and
ENTER keys, or INDEX to
LPbr and press ENTER.

SEnC

bAd

CHEC

CAL

Sensor Rate of
Change exceeded
the programmed lim­its set for SEnC.

Check calibration
appears as an alter­nating message if the
instrument calibration
nears tolerance edge.

Check calibration
appears as an alter­nating message if the
instrument calibration
exceeds specification.

Set point outputs
inactive
Alarm active.

Set point outputs
active
Alarm active.

Set point outputs
inactive
Alarm active.

Check for the cause of the
error. The value setting
may be too slow for the
process, or the sensor is
intermittent. Correct the
problem and press INDEX
and ENTER to reset.

Remove the instrument for
service and / or recalibra­tion. To reset use the
INDEX & ENTER keys.

Remove the instrument for
service and / or recalibra­tion. To reset use the
INDEX & ENTER keys.

Page 33

DIAGNOSTIC ERROR MESSAGES

DISPLAY

No

display

lighted

FAIL
tESt

CHEC

SP1,

CHEC

SP2,

CHEC

1SP, ...,

CHEC

16SP

CHEC

SPL or

CHEC

SPH

CHEC

rSpt

CHEC

LorE

ArEA

(Alternat

es with

PV when

near)

MEANING

Display is blank. Inst­rument is not getting
power, or the supply
voltage is too low.

Fail test appears
upon power up if the
internal diagnostics
detect a failure. This
message may occur
during operation if a
failure is detected.
Displays flash.

This message will
appear upon power
up if SP1, SP2,
#SP1, or ##SP is set
outside of the SPL or
SPH values.

This message ap­pears at power up if
SPL or SPH values
are programmed out­side the input range
ends.

This message ap­pears if the analog
remote set point sig­nal is out of range.

This message ap­pears if the Serial
Communications has
timed out.

This message ap­pears if the ambient
temperature of the
control is out of range
or RJC sensor is broken

SP OUTPUTS ACTION REQUIRED

Set point outputs
inactive
Alarm inactive.

Set point outputs
inactive
Alarm inactive.

Check that the power
supply is on, or that the
external fuses are good.

The display alternate
between FAIL tESt and
one of the following mes­sages: FACt dFLt:
Memory may be corrupt­ed. Press the ENTER key
and the DOWN ARROW
key to start default factory
procedure. Recheck con­troller programming. rEt
FACt: Unrecoverable
error, return to factory for
service.

Set point outputs
inactive
Alarm active.

Correct the SP1, etc. or
adjust the SPL or SPH
values by programming
new values

Set point outputs
inactive
Alarm inactive.

Set point outputs
active
Alarm inactive.

Correct the SPL or SPH
values by programming
new values.

The control will revert to
SP1. Correction of the
analog signal allows the
control to return to the
remote.

Set point outputs
active
Alarm active.

Set point outputs
active
Alarm active.

Restore the communica­tions line and switch the
LorE to LOC.

Correct the ambient tempera­ture conditions. V entilate the
area of the cabinet or check
for clogged filters. If RJC bro­ken, return to factor for service.

Page 34

Input Ranges (Field Selectable)

Thermocouple Types

Input

Type

Range

1° F

1°C

Input

Type

Range

1° F

1°C

Input

Type

Range

1° F

1°C

Type J or L* Type K*

-100 to +1600

-73 to +871

Type R

0 to 3200

-17 to +1760

Type N*

-100 to +2372

-73 to +1300

Type T*

-200 to +2500

-129 to +1371

Type S

0 to 3200

-17 to +1760

* These Input Types can be set for 0.1° display.

If temperature goes above 999.9° or less than

-199.9° the display will return the whole
degree resolution.

-350 to +750

-212 to +398

Type B

+75 to 3308
+24 to 1820

Type E*

-100 to +1800

-73 to +982

Type C

0 to 4208

-17 to 2320

RTD Types

Input

Type

Range

1° F

1°C

-328 to +1607

-200 to +875

100 Ohm
Platinum

0.00385 DIN
Curve*

100 Ohm
Platinum

0.00392 Nist
Curve*

-328 to +1607

-200 to +875

120 Ohm

Nickel

0.00628 US
Ind. Curve*

-112 to +608

-80 to +320

1000 Ohm

Platinum

0.00385 Nist
Curve*

-328 to +1607

-200 to +875

Page 35

Process Input Types

The 0 to 20 mAdc, 4 to 20 mAdc, 0 to 10 Vdc, 2 to 10 Vdc, and -10
to +10 mVdc inputs are fully scalable from a minimum of 100 counts
span placed anywhere within the range of -1999 to +9999. Decimal
point position is adjustable from zero places (9999), tenths (999.9),
hundredth (99.99), or thousands (9.999).

Page 36

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace
period to the normal one (1) year product warranty to cover handling and shipping time. This ensures
that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not
limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for
any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the
company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

FOR WARRANTY RETURNS, please have the
following information available BEFORE contacting
OMEGA:

1. Purchase Order number under which the product
was PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our
customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2017 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior
written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following information available BEFORE
contacting OMEGA:

1. Purchase Order number to cover the COST
of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems
relative to the product.

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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