Instruction/ maintenance manual of the product CN 79000 Omega Engineering
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Servicing Nor th America: U.S.A.: One Omega Drive, Box 4047 ISO 9001 Certified Stamford, CT 06907-0047 T el: (203) 359-1660 F AX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada T el: (514) 856-6928 F AX: (514) 856-6886 e-mail: info@omega.
INSTRUCTIONS FOR THE CN79000 SERIES 1/32 DIN DUAL ZONE MICROPROCESSOR BASED TEMPERA TURE/PROCESS CONTROL OMEGA Engineering One Omega Drive Stamford, Connecticut 06907-0047 P .
Page 2 of 40 Contents INSTALLATION ....................................................................................... 3 WIRING ................................................................................................... 5 Wiring for Optional Inputs and Outputs .
MODEL IDENTIFICA TION CN790 Output A 2 = Switched V oltage 5 VDC 3 = Relay Output 2 = Switched V oltage 5VDC 3 = Relay Options C4 = RS485 L V = Low V oltage.
Page 4 of 40 From the front of the panel, slide the housing through the cutout. The housing gasket should be flat against the housing flange before installing.
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Page 6 of 40 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 . 5 6 Option 992: T er minal 5 is line A (-). T erminal 6 is line B (+).
Page 7 of 40 Wiring for 4 to 20mA Transmitter inputs External Po wer Supply 24 Vdc + - T ransmitter + - Wiring for Z1 Input External Po wer Supply 24 Vdc + - T ransmitter + - Wiring for Z2 Input DO NOT WIRE THE 24 VOLT POWER SUPPLY ACROSS THE INPUT OF THE CONTROL.
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Page 9 of 40 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 ARROW 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 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 V ariable for Set Point 1 on the top display and the Process variable for Set Point 2 on the bottom.
Page 11 of 40 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.
Page 12 of 40 OPERATION OF SELF TUNE® FUNCTION Self Tune® allows automatic selection of the necessary parameters to achieve best control operation from your C N 74000 Series control. If you are using the control output as a simple on-off function (e.
Page 13 of 40 The calculations for the 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 dFC1 dFC1 dFC1 dFC1 dFC1 and dfC2 dfC2 dfC2 dfC2 dfC2 menu items.
Page 14 of 40 FACTORY DEFAULT PROCEDURE If for any reason you wish to restore the factory settings use the following procedure. 1. Turn off power to control 2. Turn on power to control 3. While control is performing SELF SELF SELF SELF SELF tESt tESt tESt tESt tESt , press and hold the INDEX and ENTER keys.
Page 15 of 40 SECONDARY MENU Hold UP ARROW & ENTER. 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. Edit Edit Edit Edit Edit Edit Set Point parameters: Select 0 , 1 , 2 , or 3 .
Page 16 of 40 Power On, PEA2 is reset to the present input. To manually reset the value PEA2 PEA2 PEA2 PEA2 PEA2 must be in the lower display. Press the ENTER key to reset.
age 17 of 40 If Edit Edit Edit Edit Edit is set to 1 1 1 1 1 or 3 3 3 3 3 , begin. If Edit Edit Edit Edit Edit is set to 2 2 2 2 2 , jump to Out2 Out2 Out2 Out2 Out2 on page 20. Out1 Out1 Out1 Out1 Out1 Output selection: Select OnOf OnOf OnOf OnOf OnOf , 1tP 1tP 1tP 1tP 1tP , or 1PuL 1PuL 1PuL 1PuL 1PuL .
Page 18 of 40 value of 1 provides an output of one sec- ond on and one second off (50% output). A pulse value of 2 provides an output of one second on and two seconds off (33% out- put). Output at center of band equals one second on, 2 (pulse value-1) seconds off.
Page 19 of 40 OFF OFF OFF OFF OFF Reset Offset Value is retained in memory when the process input is not within the Proportional Band. Art1 Art1 Art1 Art1 Art1 Approach Rate Time: Select OFF OFF OFF OFF OFF , 0.01 0.01 0.01 0.01 0.01 to 99.99 99.99 99.
Page 20 of 40 InC1 InC1 InC1 InC1 InC1 Input Correction: Select -500 -500 -500 -500 -500 to 500 500 500 500 500 °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.
Page 21 of 40 If Edit Edit Edit Edit Edit is set to 1 1 1 1 1 , jump to LorE LorE LorE LorE LorE on page 24. If Edit Edit Edit Edit Edit is set to 3 3 3 3 3 , continue.
Page 22 of 40 center of the proportional band, a pulse value of 1 provides an output of one sec- ond on and one second off (50% output). A pulse value of 2 provides an output of one second on and two seconds off (33% out- put). Output at center of band equals one second on, 2 (pulse value-1) seconds off.
Page 23 of 40 OFF OFF OFF OFF OFF Reset Offset Value is retained in memory when the process input is not within the Proportional Band. Art2 Art2 Art2 Art2 Art2 Approach Rate Time: Select OFF OFF OFF OFF OFF , 0.01 0.01 0.01 0.01 0.01 to 99.99 99.99 99.
Page 24 of 40 InC2 InC2 InC2 InC2 InC2 Input Correction: Select -500 -500 -500 -500 -500 to 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: InC2 is reset to zero when the input type is changed, or when decimal position is changed.
Page 25 of 40 address 17 17 17 17 17 and Zone 2 is assigned to address 18 18 18 18 18 ). To change this parameter, see Addr Addr Addr Addr Addr in the Secure Menu. SECURE MENU Hold UP ARROW & ENTER for 5 Seconds. Press INDEX to advance to the next menu item.
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Page 27 of 40 Note: If both Set Point 1 and Set Point 2 are set for temperature inputs, they must both be set for the same scale. While it is possible to set one input as degrees F and the other degrees C, as there is only one descriptor, one of the displays is likely to be mis-read.
Page 28 of 40 SCH1 SCH1 SCH1 SCH1 SCH1 Scale High: Select 100 to 9999 counts above SCL1 SCL1 SCL1 SCL1 SCL1 . The total span between SCL1 SCL1 SCL1 SCL1 SCL1 and SCH1 SCH1 SCH1 SCH1 SCH1 must be within 11998 counts. Maximum setting range is -1999 to + 9999 counts.
Page 29 of 40 devices which do not have bias adjustments. Factory set to 100 100 100 100 100 for all output codes. If Out1 Out1 Out1 Out1 Out1 is set for ## tP tP tP tP tP , # PUL PUL PUL PUL PUL , or ProP ProP ProP ProP ProP ,then skip to S1LP S1LP S1LP S1LP S1LP .
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Decimal Point Positioning: Select 0 0 , , 0 0 . . 0 0 . This will only ef fect the Process V alue, SP1, SP2, and InC1llnC2. 0 0 No decimal Point is selected.
Page 32 of 40 SCH2 SCH2 SCH2 SCH2 SCH2 Scale High: Select 100 to 9999 counts above SCL2 SCL2 SCL2 SCL2 SCL2 . The total span between SCL2 and SCH2 must be within 11998 counts. Maximum setting range is -1999 to +9999 counts. Minimum span is 100 counts.
Page 33 of 40 devices which do not have bias adjustments. Factory set to 100 100 100 100 100 for all output codes. If Out2 Out2 Out2 Out2 Out2 is set for ## tP tP tP tP tP , # PUL PUL PUL PUL PUL , or ProP ProP ProP ProP ProP ,then skip to S2LP S2LP S2LP S2LP S2LP .
Page 34 of 40 The following Menu Items operate on the entire Instrument. There is no Set Point distinction. These items will appear in both the Edit1 Edit1 Edit1 Edit1 Edit1 , Edit2 Edit2 Edit2 Edit2 Edit2 , and Edit3 Edit3 Edit3 Edit3 Edit3 menus.
Page 35 of 40 SPECIFICATIONS Input: Thermocouple . Input Impedance: Thermocouple = 3 megohms minimum. Sensor Break Protection: De-energizes control output to protect system after customer set time. (See InP1 and InP2 in Secondary Menu.) Set Point Range: Selectable (See Range Chart Page 39).
Page 36 of 40 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.
Page 37 of 40 DISPLAY No display lighted FAIL FAIL FAIL FAIL FAIL tESt tESt tESt tESt tESt CHEC SP1 CHEC SP1 CHEC SP1 CHEC SP1 CHEC SP1 CHEC SP2 CHEC SP2 CHEC SP2 CHEC SP2 CHEC SP2 CHEC SPL1 CHEC SPL1.
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OMEGA Engineering One Omega Drive Stamford, Connecticut 06907-0047 P .O. Box 4047 T elephone: 800/848-4286; 203/359-1660 Fax: 203/359-7700 FR# 08-195860-03.
OME GA ENGINEERING, INC. war rants this unit to be free of defects in materials and workmanship for a period of from date of purc hase. OME GA ’ s WARRAN TY adds an additional one (1) month grace period to the normal to cover handling and shipping time.
Where Do I Find Everything I Need for Pr ocess Measurement and Contr ol? OM EGA…Of Course! Shop online at omega.com TEMPERA TURE 䡺 ⻬ Thermocouple, R TD & Thermistor Pr obes, Connectors, Pane.
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