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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.
Contents INSTALLATION ....................................................................................... 3 WIRING ................................................................................................... 5 Wiring for Optional Inputs and Outputs ................................................... 6 Wiring for 4 to 20mA Transmitter inputs ................................................. 7 FRONT PANEL KEY FUNCTIONS .........................................................
MODEL IDENTIFICATION CN790 Output 2 = Switched Voltage 5VDC 3 = Relay Output A 2 = Switched Voltage 5 VDC 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) 20.5 (0.807) 22.2 + 0.3 (0.874 + 0.012) From the front of the panel, slide the housing through the cutout. The housing gasket should be flat against the housing flange before installing. Panel Collar Gasket From the rear of the panel slide the mounting collar over the housing.
Control wiring is as shown. The wiring terminals for the C N 79000 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.
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.
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.
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.
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. S2t When setting SP2 value when Set Point 2 is programmed as deviation (S2t dE SP1 = dE), set the difference in value from the Set Point 1 (SP1 SP1) desired.
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 and dfC2 menu items. These menu items control the amount of rate (derivative) that is applied. A dFC1 or dfC2 setting of 3 (factory default) or less allows for less damping.
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 LOC. To allow the host to write commands to the control set LOrE to rE rE.
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. SP1 Set Point 1 Adjust, Control Point 1. SP2 Set Point 2 Adjust, Control Point 2. 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 Set Point parameters: Select 0, 1, 2, or 3.
Power On, PEA2 is reset to the present input. To manually reset the value PEA2 must be in the lower display. Press the ENTER key to reset. PEA2 will be reset and display the present input value. UAL2 The Valley feature stores the lowest input the Instrument has measured for Zone 2 since the last reset or Power On. At Power On, UAL2 is reset to the present input. To manually reset the value UAL2 must be in the lower display. Press the ENTER key. UAL2 will be reset and display the present input value.
If If Edit is set to 1 or 3 , begin. Edit is set to 2 , jump to Out2 on page 20. Out1 Output selection: Select OnOf OnOf, 1tP 1tP, or 1PuL 1PuL. A setting of ONOF allows the control to operate as ONOF a simple on/off mode. This setting forces the control to turn off at set point, and on at the set SP1d point plus the differential (SP1d SP1d).
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. tun1 Tuning Choice: Select SELF SELF, Pid Pid, SLO SLO, nor nor, or FASt FASt. The instrument will evaluate the Process and SELF select the PID values to maintain good control. Active for SP1 only.
OFF Reset Offset Value is retained in memory when the process input is not within the Proportional Band. Art1 Approach Rate Time: Select OFF 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 Art1 time and the rtE1 time are independent and have no effect on each other.
InC1 Input Correction: Select -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: InC1 is reset to zero when the input type is changed, or when decimal position is changed. FiL1 Digital Filter: Select OFF OFF, 1 to 99 99. In some cases the time constant of the sensor, or noise could cause the display to jump enough to be unreadable.
If If If Edit is set to Edit is set to Edit is set to Out2 1 , jump to LorE on page 24. 3 , continue. 2 , begin. Output selection: Select OnOf OnOf, 1tP 1tP, or 1PuL 1PuL. ONOF ONOF A setting of 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 SP2d point plus the differential (SP2d SP2d).
ProP tun2 SELF Pid SLO nor FASt ArS2 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. For Current (Code 5) outputs only. Tuning Choice: Select SELF SELF, Pid Pid, SLO SLO, nor nor, or FASt FASt.
OFF Reset Offset Value is retained in memory when the process input is not within the Proportional Band. Art2 Approach Rate Time: Select OFF 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 Art2 time and the rtE2 time are independent and have no effect on each other.
InC2 Input Correction: Select -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. Fil2 Digital Filter: Select OFF OFF, 1 to 99 99. In some cases the time constant of the sensor, or noise could cause the display to jump enough to be unreadable.
address 17 and Zone 2 is assigned to address 18 ). 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 THE INSTRUMENT IS IN SECURE MENU. If If If Edit is set to Edit is set to Edit is set to 0 , begin. 1 or 3 , jump to SEC1 on page 26. 2 , jump to SEC2 on page 29.
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. If one Set Point is set for process input, you may select to display either the temperature descriptor or neither (nonE). dPt1 Decimal Point Positioning: Select 0 , 0.0 0.0, 0.00 0.00, or 0.000 0.000.
SCH1 Scale High: Select 100 to 9999 counts above SCL1 SCL1. The total span between SCL1 and SCH1 must be within 11998 counts. Maximum setting range is -1999 to +9999 counts. Minimum span is 100 counts. For Current and Voltage inputs, this will set the high range end. Viewable only for Thermocouple and RTD ranges. SPL1 Set Point Low: Select from the lowest input range value to SPH1 value. This will set the minimum SP1 value that can be entered.
devices which do not have bias adjustments. Factory set to 100 for all output codes. tP PUL If Out1 is set for ##tP tP, #PUL PUL, or ProP ProP,then skip to S1LP S1LP. S1rE Set Point Reset. Select OnOF or Hold Hold. Control will automatically reset when process OnOF passes back through SP1d SP1d. HoLd Manual Reset. Reset (acknowledge) by simultaneously pressing the INDEX & DOWN ARROW keys for 5 seconds. S1Pi Set Point Power Interrupt. Select On or OFF OFF. Alarm Power Interrupt is On On.
Decimal Point Positioning: Select 0, 0.0. This will only effect the Process Value, SP1, SP2, and InC1llnC2. 0 No decimal Point is selected. 0.0 One decimal place is available for Type J, K, E, T, L Inputs.
SCH2 Scale High: Select 100 to 9999 counts above 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. For Current and Voltage inputs, this will set the high range end. Viewable only for Thermocouple and RTD ranges. SPL2 Set Point Low: Select from the lowest input range value to SPH1 value. This will set the minimum SP2 value that can be entered.
devices which do not have bias adjustments. Factory set to 100 for all output codes. tP PUL If Out2 is set for ##tP tP, #PUL PUL, or ProP ProP,then skip to S2LP S2LP. S2rE Set Point Reset. Select OnOF or Hold Hold. Control will automatically reset when process OnOF passes back through SP2d SP2d. HoLd Manual Reset. Reset (acknowledge) by simultaneously pressing the INDEX & DOWN ARROW keys for 5 seconds. S2Pi Set Point Power Interrupt. Select On or OFF OFF. Alarm Power Interrupt is On On.
The following Menu Items operate on the entire Instrument. There is no Set Point distinction. These items will appear in both the Edit1 Edit1, Edit2 Edit2, and Edit3 menus. SP1o Set Point 1 Output Select: Select OutA or Outb Outb. OutA Set Point 1 is routed through Output A, Set Point 2 is routed through Output B. Outb Set Point 1 is routed through Output B, Set Point 2 is routed through Output A. COPY Copy Zone Parameters. Copies program parameters from one zone to the other.
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). 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.
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").
DIAGNOSTIC ERROR MESSAGES DISPLAY No display lighted MEANING SP OUTPUTS ACTION REQUIRED Check that the power supply is Display is blank. InSet point strument is not get- outputs inactive on, or that the external fuses ting power, or the sup- Alarm inactive are good. ply voltage is too low. Fail test appears Set point upon power up if the outputs inactive internal diagnostics Alarm inactive detect a failure. This message may occur during operation if a failure is detected. Displays flash.
OMEGA Engineering One Omega Drive Stamford, Connecticut 06907-0047 P.O.
WARRANTY/DISCLAIMER 13 months OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal 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.
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