Omega CN4321 User manual

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TABLE OF CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unpacking. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CN4321
Model Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Outer Dimensions and Panel Cutout Size . . . . . . . . . . . . . . . . . . . . . 13
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Wiring Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Front Panel Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Front Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
CN4431
Model Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Outer Dimensions and Panel Cutout Size . . . . . . . . . . . . . . . . . . . . . 25
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wiring Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
System Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Front Panel Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Front Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Programming
Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
System Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Factory Preset Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Appendix A: Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Appendix B: Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Appendix C: Heat/Cool Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

2
INTRODUCTION
The OMEGA®CN4321 and CN4431 controllers are economical
process controllers that accept temperature or process inputs, and
have sophisticated control capabilities, providing on/off control, PID, or
autotune PID, with Fuzzy Logic. They feature an 8-segment ramp/soak
function.
The CN4431 is a 1/16 DIN controller that has dual digital display for
simultaneous indication of process value and setpoint. It is available
with a single output that includes mechanical relay, 24V DC SSR driver,
or 4-20 mA output. Options available include alarms (configurable as
high/low, deviation, or zone alarm).
The CN4321 is a 1/32 DIN controller that has a single digital display.
It is available with either single or dual outputs; dual output models can
be used for heat/cool, heat/heat or cool/cool control. Output options
include mechanical relay and 5V DC SSR driver. It also has an optional
programmable alarm output.
The first section of this manual details the specifications and gen-
eral description for the CN4321 controller. The second section will cover
the CN4431 controller, followed by a detailed description of the pro-
gramming parameters, which are common to both the controllers. Sev-
eral appendices describe some of the controlling techniques. Finally, a
Quick Reference guide gives a listing of all the parameters and their
default values.

3
FEATURES
• Fuzzy Logic Control
• PID Autotune with manual over-
ride - heating or cooling
• Programmable control action -
reverse or direct
• Programmable cycle time
• Programmable inputs - Thermo-
couple/RTD, or Current/ Voltage
• Sensor burn-out protection
• Zero/span calibration
• Outputs: Relay, Solid-state relay
drive, or 4-20mA DC (4-20mA
not available on CN4321)
• Secondary output for
cooling (optional)
• High/low alarm
outputs (optional)
• Menu-driven format
• Setting – touch keys on front
panel
• Programmable 8-segment
ramp/soak function
• Digital filtering (to suppress
factory noise)
• Adjustable setpoint range
• Selectable °F/°C
• Offset adjustments
• Programmable decimal point
• Programmable lock-up feature
• Advanced security options to
prevent unauthorized parame-
ter changes
• 4-digit, LED indication
• Output status indication
• Fault indication
• Non-volatile memory
• 1/32 or 1/16 DIN panel mount
package with plastic bracket
• NEMA 4X faceplate
• ABS plastic housing
• Termination– terminal block
(CN4321) or socket with screw-
down terminals (CN4431)
• 85 to 264V AC free voltage
power supply
• 24V AC/DC optional power
supply (on CN4431 only)
• UL and C-UL recognized
• CE approved

4
SAFETY PRECAUTIONS
Before using this product, the user is requested to read the following
precautions carefully to ensure safety. The safety requirements are
classified as either “warning” or “caution” according to the following
explanations:
Warning
Wiring
1. If there is danger of serious accident resulting from a failure or
defect in this unit, provide the unit with an appropriate external pro-
tective circuit to prevent an accident.
2. The unit is normally supplied without a power switch or a fuse. Use
power switch and fuse as required (Rating of the fuse: 250V, 1A)
Power supply
1. Be sure to use the rated power supply voltage to protect the unit
against damage and to prevent failure.
2. Keep the power off until all of the wiring is completed so that electric
shock and trouble with the unit can be prevented.
General
1. Never attempt to disassemble, modify, or repair this unit. Tampering
with the unit may result in malfunction, electric shock, or fire.
2. Do not use the unit in combustible or explosive gaseous atmos-
pheres.

5
Caution
Installation
1. Avoid installing the unit in places where:
• the ambient temperature may reach beyond the range of -10 to 50°C
(14 to 122°F) while in operation
• the ambient humidity may reach higher than 90% RH while in
operation
• a change in the ambient temperature is so rapid as to cause
condensation
• corrosive gases (sulfide and ammonia gas, in particular) or
combustible gases are emitted
• the unit is subject to vibration or shock
• the unit is likely to come in contact with water, oil, chemicals, steam,
or vapor
• the unit is exposed to dust, salt, or air containing iron particles
• the unit is subject to interference with static electricity, magnetism,
or noise
• the unit is exposed to direct sunlight
• heat may be accumulated due to the radiation of heat
Maintenance
1. Do not use organic solvents such as alcohol or benzene to wipe this
unit. Use a neutral detergent.

UNPACKING
Remove the Packing List and verify that you have received all equipment,
including the following (quantities in parenthesis):
• Process controller (1)
• Mounting bracket (1)
• Socket with CN4431 (1)
• Operator’s manual (1)
• Waterproof gasket (1)
• 250Ωprecision resistor (when required) (1)
• Current transformer (when required) (1)
If you have any questions about the shipment, please call the OMEGA®Cus-
tomer Service Department.
When you receive the shipment, inspect the container and equipment for signs
of damage. Note any evidence of rough handling in transit. Immediately report
any damage to the shipping agent.
Note:
The carrier will not honor damage claims unless all shipping materials are
saved for inspection. After examining and removing contents, save packing
material and carton in the event reshipment is necessary.
6

7
CN4321 MODEL CONFIGURATION
MODEL DESCRIPTION
Single Output Models
_________________________________________________________________
CN4321(*)-R1 1/32 DIN controller, relay output
CN4321(*)-D1 1/32 DIN controller, DC SSR driver output
_________________________________________________________________
Dual Output Models
_________________________________________________________________
CN4322(*)-R1-R2 1/32 DIN controller, dual relay output
CN4322(*)-D1-R2 1/32 DIN controller, DC SSR driver and relay output
_________________________________________________________________
* Specify TR for Thermocouple/RTD input or CV for current/voltage input
ALARM OPTION (Not Available with CN4322)
_________________________________________________________________
-A 1A, SPST relay
_________________________________________________________________

8
CN4321 SPECIFICATIONS
INPUT RANGE TABLE:
_________________________________________________________
Input Signal Input Range Input Range Remarks
(°C) (°F)
_________________________________________________________
Thermocouple*
J 0 ~ 800 32 ~ 1472 Cold Junction
K 0 ~ 1200 32 ~ 2192 compensating
R 0 ~ 1600 32 ~ 2912 function built-in
B 0 ~ 1800 32 ~ 3272
S 0 ~ 1600 32 ~ 2912
T -199 ~ 200 -328 ~ 392
T -150 ~ 400 -238 ~ 752
E -199 ~ 800 -328 ~ 1472
N 0 ~ 1300 32 ~ 2372
PL2 0 ~ 1300 32 ~ 2372
_________________________________________________________
RTD* Pt100 -150 ~ 850 -238 ~ 1562 Allowable wiring
α= .00385 resistance 10 ohms
max (per wire).
_________________________________________________________
DC Voltage/
Current**
1-5V Scaling Range: -1999 to 9999 For current input, use
0-5V Engineering the 250Ω resistor to
4-20mA units obtain 1-5V DC or
0-20mA 0-5V DC input.
_________________________________________________________
* For TR models
** For CV models
See also the description for parameter P-n2 in the programming section, on
how to program for a particular input.

9
CONTROL FUNCTION
(SINGLE OUTPUT)
_________________________________________________________
Control action PID control with auto-tuning
Fuzzy control with auto-tuning
_________________________________________________________
Proportional band (P) 0-999.9% of full scale (FS), setting in 0.1% steps
_________________________________________________________
Integral time (I) 0-3200 sec, setting in 1 sec steps
_________________________________________________________
Differential time (D) 0-999.9 sec, setting in 0.1 sec steps
_________________________________________________________
P,I,D = 0: On/Off action
I,D = 0: Proportional action
_________________________________________________________
Proportional cycle 1-150 sec, setting in 1 sec steps, for relay contact
output and DC SSR driver output only
_________________________________________________________
Hysteresis width 0-50% FS, setting in 1 E.U. (Engineering Unit) steps
On/Off action only
_________________________________________________________
Anti-reset wind up 0-100% FS, setting in 1 E.U. steps, auto-setting
with auto-tuning
_________________________________________________________
Input sampling cycle 0.5 sec
_________________________________________________________
CONTROL FUNCTION
(DUAL OUTPUT) (Heat/Cool Type)
_________________________________________________________
Heating Proportional band P x 1/2 (P= 0-999.9%)
_________________________________________________________
Cooling Proportional band Heating proportional band x Cooling proportional
band coefficient
Cooling proportional band coefficient= 0-100
0: On/Off action
_________________________________________________________
Integral time 0-3200 sec for heating and cooling
_________________________________________________________
Differential time 0-999.9 sec for heating and cooling
_________________________________________________________