Omega Products CN79000 Installation Manual

User’s Guide

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INSTRUCTIONS FOR THE CN79000 SERIES

1/32 DIN DUAL ZONE MICROPROCESSOR BASED

TEMPERATURE/PROCESS CONTROL

OMEGA Engineering

One Omega Drive
Stamford, Connecticut 06907-0047
P.O. Box 4047
Telephone: [phone]
Fax: [phone]

Contents

INSTALLATION....................................................................................... 3

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

ALARM TYPE AND ACTION ................................................................ 11

OPERATION OF SELF TUNE® FUNCTION......................................... 12

Theory of Operation .............................................................................. 12

Program Setup and Operation...............................................................13

OPERATION AND PROGRAMMING OF OPTIONS ............................. 13

Option C4, Serial Communication. ...................................................... 13

FACTORY DEFAULT PROCEDURE .................................................... 14

MENU SELECTIONS ........................................................................... 14

PRIMARY MENU .................................................................................. 14

SECONDARY MENU ............................................................................ 15

SECURE MENU.................................................................................... 25

SPECIFICATIONS ................................................................................ 35

DIAGNOSTIC ERROR MESSAGES ..................................................... 37

DIAGNOSTIC ERROR MESSAGES ..................................................... 38

DIMENSIONS ....................................................................................... 40

Page 2 of 40

CN790

MODEL IDENTIFICATION

Output

2 = Switched

Voltage 5VDC

Output A

2 = Switched Voltage 5 VDC
3 = Relay

3 = Relay

Options

C4 = RS485
LV = Low Voltage

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

25.4

(1.00)

45 + 0.6

(1.772 + 0.02)

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

20.5

(0.807)

22.2 + 0.3

(0.874 + 0.012)

Panel

Collar

Gasket

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.

Page 4 of 40

Control wiring is as shown.

The wiring terminals for the CN79000 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. Wiring for options is shown below. All wiring
shown below is Class 2. Shielded twisted pair is required for Option C4.

Option 992: Terminal 5 is line A (-).

Terminal 6 is line B (+).
Last control in chain must have 120 ohm ± 1%
resistor across 5 and 6.

Option 9502: Connect 12 to 24 Volt ac or
dc power to terminals 11 and

12. No polarity.

Note: Industry standard designation for

5

RS-485 lines is A and B. Some equip­ment manufacturers use a non-standard designation of plus and minus. The
association of A to minus and B to plus is based on a sample of devices marked as
plus and minus and is not intended to represent ALL such labelled devices. Final
responsibility for correct identification of leads and terminals rests with the user/
installer and the manufacturer of the other device(s) installed in the system.

Page 6 of 40

11

6

12

Wiring for 4 to 20mA Transmitter inputs

WARNING: The inputs of the instrument are not isolated
from each other. The input sources must be isolated
from each other. Process inputs may not share a
common external ground.

FAILURE TO OBSERVE THIS WARNING MAY CAUSE
DANGEROUS OR LETHAL VOLTAGES TO BE PRESENT
IN THE INSTRUMENT WHICH MAY CAUSE SERIOUS
INJURY OR DEATH.

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

External Power Supply

24 Vdc

Transmitter

+ -

+ -

Wiring for Z1 Input

External Power Supply

24 Vdc

+ -

Transmitter

+ -

Wiring for Z2 Input

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 INSTRUMENT INPUT CIRCUITRY WILL RE­SULT.

Page 7 of 40

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
ARROWkeys.

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
UPARROW and 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
may be viewed or changed at any time regardless of the present security
level.

SEC1SEC1

SEC1 or

SEC1SEC1

SEC2SEC2

SEC2 menu items security level

SEC2SEC2

To set the access level to, for example,

UP ARROW key until the upper display shows the password,
Press the ENTER key. The display will blink, and return with the level
value,

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

22

2, in the upper display.

22

Security Level

Menu Status
Primary Locked

Secondary Locked
Secure Locked

Primar y Unlocked
Secondary Locked
Secure Locked

Primar y Unlocked
Secondary Unlocked
Secure Locked

Primar y Unlocked
Secondary Unlocked
Secure Unlocked

PASSWORD TABLE

Displayed Value

22

2, at the

22

When Viewed

1

2

3

4

SEC1SEC1

SEC1 menu item press the

SEC1SEC1

11011101

1101.

11011101

Password Value

To Enter

1110

1101

1011

111

Page 9 of 40

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 for Set Point 1 on the top display and the Process
variable for Set Point 2 on the bottom.

Menu items that are dedicated to either Zone 1 or Zone 2 will have either
a 1 or 2 in them for identification.

If Edit is set to any value other than 0, the setting will be retained for
a period of five minutes to allow handy, repeated access to that zone's
menues. After five minutes of keypad inactivity, the Edit setting will
revert to 0, giving an added layer of security to prevent inadvertant
changes to the instrument.

PROGRAMMING SET POINTS FOR ALARM FUNCTIONS

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

The C N 74000 Series allows Zone 1 and / or Zone 2 to operate as limit or alarm
type outputs. This function is available on both outputs. To enable a zone
output to act as an alarm or limit,
be set for

OnOfOnOf

OnOf.

OnOfOnOf

Out1Out1

Out1 (for Zone 1) or

Out1Out1

Out2Out2

Out2 (for Zone2) should

Out2Out2

Out1Out1

When

Out1 and / or

Out1Out1

will appear in the Secure Menu for the selected zone(s).
When Set Point Power Interrupt (

SS

Reset (
after a power failure and on subsequent power restoration if no alarm
condition is present.

If Set Point Inhibit (
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 11 of 40

rErE

S#

rE) is programmed for

SS

rErE

Out2Out2

Out2 are set to

Out2Out2

SS

iHiH

S#

iH) is selected

SS

iHiH

Warning: If inhibit is on and a power failure occurs
during a high alarm, on restoration of power inhibit will
suppress the alarm. Do not use the Set Point Inhibit
feature if a hazard may be created by this action. Be sure
to test all combinations of high and low set point inhibit
actions before placing control into operation.

OnOFOnOF

OnOF, then the alarm function menu items

OnOFOnOF

SS

PiPi

S#

Pi) is programmed

SS

PiPi

HoldHold

Hold, the alarm will automatically reset

HoldHold

ONON

ON, an alarm condition is suspended

ONON

ONON

ON and Set Point

ONON

Set Point 2 Tracking

Some applications will call for Set Point 2 to follow or 'track' the setting for
Set Point 1. This can be done by changing the S2t setting in the Secure Menu
(edit set for 2 or 3). For a tracking SP2, set S2t to dE.

The Factory Default setting for S2t is ABS, making SP2 completely
independent of SP1.

When setting

dEdE

=

dE), set the difference in value from the Set Point 1 (

dEdE

example if Set Point 2 is required to be 5 degrees below the

SP2SP2

SP2 to

-5. If Set Point 2 is required 20 degrees above the

SP2SP2

2020

to

20. If

2020

relationship as originally set.
When setting SP2 value when Set Point 2 is programmed as absolute (S2t

= AbS), simply set the value at which the alarm is to occur.

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

Theory of Operation

The Self Tune function calculates the

PID1 tunEPID1 tunE

the

PID1 tunE selection,

PID1 tunEPID1 tunE

selection, the
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

Fi 1Fi 1

If

Fi 1 or Fi 2 is

Fi 1Fi 1

have no effect.

SP2SP2

SP2 value when Set Point 2 is programmed as deviation (

SP2SP2

-5-5

-5-5
SP1SP1

SP1 is changed, the

SP1SP1

OPERATION OF SELF TUNE® FUNCTION

Pb2Pb2

Pb2,

Pb2Pb2

Fbd1Fbd1

Fbd1 and

Fbd1Fbd1

Frt1Frt1

Frt1 parameters, and the

Frt1Frt1

00

Fbd1Fbd1

0, the

Fbd1,

00

Fbd1Fbd1

SP2SP2

SP2 setting will continue to hold the same

SP2SP2

Pb1Pb1

rES2rES2

rES2, and

rES2rES2

Frt1Frt1

Fbd2Fbd2

Frt1,

Fbd2, and

Frt1Frt1

Fbd2Fbd2

rES1rES1

Pb1,

rES1, and

Pb1Pb1

rES1rES1

rtE2rtE2

rtE2 parameters under the

rtE2rtE2

Fi 1Fi 1

Fi 1 and Fi 2 (fuzzy intensity) settings.

Fi 1Fi 1

rtE1rtE1

rtE1 parameters under

rtE1rtE1

Fbd2Fbd2

Fbd2 and

Fbd2Fbd2

Frt2Frt2

Frt2 will be calculated, but will

Frt2Frt2

SP1SP1

SP1) desired. For

SP1SP1

SP1SP1

SP1, then set

SP1SP1

SP1SP1

SP1, then set

SP1SP1

Out1Out1

Out1 set for

Out1Out1

Frt2Frt2

Frt2 parameters,

Frt2Frt2

S2tS2t

S2t

S2tS2t

SP2SP2

SP2

SP2SP2

OnOFOnOF

OnOF),

OnOFOnOF

PID2 tunEPID2 tunE

PID2 tunE

PID2 tunEPID2 tunE

The calculations for Zone 1 and Zone 2 are completely independent. Each zone
has separate Self Tune and Fuzzy Logic parameters.

Page 12 of 40