Omega CN4420 Series User manual

TABLE OF CONTENTS
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Model Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Outer Dimensions and Panel Cutout Size . . . . . . . . . . . . . . . . . . . . . . . 15
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Wiring Instructions: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Front Panel Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Front Panel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Programming
1. Set Up Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2. System Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Appendix A: Autotuning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Appendix B: Manual Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Appendix C: Heater Burnout Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Appendix D: Heat/Cool Option. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Quick Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

2
INTRODUCTION
The OMEGA CN4420, CN4520, CN4620, and CN4720 Series 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. The controllers have
common features, but differ in panel-size requirements. They are avail-
able with mechanical relay, 24 VDC SSR driver, or 4-20 mA output. They
also come with an 8-segment ramp/soak function.
The CN4420 units have single digital display for indication of process/
setpoint values. These are available with a single control output and
optional process alarm. They are used in conjunction with a socket.
The CN4520, CN4620, and CN4720 units have dual digital displays for
simultaneous indication of process value and setpoint. These units are
available with either single or dual outputs; dual output models can be
used for heat/cool, heat/heat or cool/cool control. Options available
include dual alarms (user-selectable between high/low and deviation
action), as well as an inoperative-heater alarm. The heater alarm is a
1A mechanical relay that is triggered when the heater current trans-
former senses that the heater is not getting power.

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
DC Current/Voltage
• Sensor burn-out protection
• Zero/span calibration
• Outputs: Relay, Solid-state relay
drive, and 4-20mA DC
• Secondary output for
cooling (optional)
• High/low alarm
outputs (optional)
• Heater burnout alarm (optional)
(only on CN4520, CN4620,
CN4720)
• 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 feature
• Advanced security options to
prevent unauthorized para-
meter changes
• 4-digit, LED indication
• Output status indication
• Fault indication
• Non-volatile memory
• 1/16, 1/8, 1/4 DIN and 72mm
panel mount package
• NEMA 4X faceplate
• ABS plastic housing
• Termination– screw-down type
(CN4520, CN4620, CN4720) or
socket with screw-down
terminals (CN4420)
• Metal mounting bracket; plastic
bracket for CN4420
• 85 to 264V AC free voltage
power supply
• 24V AC/DC power supply
(optional)
• UL, 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
protective 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.
Warning suggesting that the user's mishandling can
result in personal death or serious injury.
Caution
suggesting that the user's mishandling can result
in personal injury or damage to the property.

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 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 radiation
Maintenance
1. Do not use organic solvents such as alcohol or benzene to wipe this
unit. Use a neutral detergent.

6
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 CN4420 (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
Customer 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.

7
MODEL DESCRIPTION
Single Output Models
_________________________________________________________________
CN4421(*)-(**) 1/16 DIN controller
CN4521(*)-(**) 1/8 DIN controller
CN4621(*)-(**) 1/4 DIN controller
CN4721(*)-(**) 72 mm sq. controller
_________________________________________________________________
Dual Output Models
_________________________________________________________________
CN4522(*)-(**)-(***) 1/8 DIN controller
CN4622(*)-(**)-(***) 1/4 DIN controller
CN4722(*)-(**)-(***) 72 mm sq. controller
_________________________________________________________________
* Specify TR for Thermocouple/RTD input or CV for current/voltage input
** Specify first output code from Output Options table below
*** Specify second output code from Output Options table below
OUTPUT OPTIONS
_________________________________________________________________
Option Type First Output Second Output*
_________________________________________________________________
Relay -R1 -R2
DC SSR driver -D1 -D2
4-20 mA -F1 -F2
_________________________________________________________________
* Available on CN4522, 4622, and 4722 models only
ALARM OPTION FOR CN4421
_________________________________________________________________
-A Single alarm
ALARM OPTIONS FOR CN4520, 4620, AND 4720 SERIES
_________________________________________________________________
-A2 Dual alarms
-H30* Heater burnout alarm, includes 0 to 30A current transformer
-H50* Heater burnout alarm, includes 20 to 50A current transformer
_________________________________________________________________
* Not available with options F1 or F2
All alarm relays share the same common
Both process and heater burnout alarm can be selected at the same time
LOW VOLTAGE POWER SUPPLY OPTION
_________________________________________________________________
-24V 24V AC/DC, 50/60 Hz
MODEL CONFIGURATION

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.
8

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 Units) 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) CN4522, CN4622, CN4722 only
_________________________________________________________
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
_________________________________________________________

10
_________________________________________________________
P,I,D= 0: On/Off action (without dead band) for heating and cooling
I,D= 0: Proportional action
_________________________________________________________
Proportional cycle 1-150 sec, for relay contact output and DC SSR
driver output only
_________________________________________________________
Hysteresis width On/Off action for heating and cooling: 0.5% FS
On/Off action for cooling: 0.5% FS
_________________________________________________________
Anti-reset wind-up 0-100% FS, setting in 1 E.U. steps, auto-setting
with auto-tuning
_________________________________________________________
Overlap/dead band ±50% of heating proportional band
_________________________________________________________
Input sampling cycle 0.5 sec
_________________________________________________________
OUTPUT
(Single Output)
_________________________________________________________
Control output One of the following three types is selected:
(1) Relay contact (SPDT)
220V AC/30V DC, 3A (resistive load)
Mechanical life: 107times (under no load)
Electrical life: 105times (under the rated load)
(2) DC SSR driver (voltage pulse):
15-30V DC at ON/0.5V DC or less at OFF.
Current: 60mA or less.
(3) 4-20mA DC:
Allowable load resistance– 600Ωor less.
_________________________________________________________

11
OUTPUT
(Dual Output) CN4522, CN4622, CN4722 only
_________________________________________________________
Control output For dual output type, one of the following three
types is selected on both heating and cooling types:
(Not available on CN4420)
(1) Relay contact (SPDT):
220V AC/30V DC, 3A (resistive load)
(2) DC SSR driver (voltage pulse):
15-30V DC at ON/0.5V DC or less at OFF.
Current: 60mA or less
(3) 4-20mA DC:
Allowable load resistance – 600Ωor less
(Note: When DC SSR driver output for heating/
cooling side is selected, the total current should
be less than 60mA)
_________________________________________________________
ALARM
_______________________________________________________
Alarm output Relay contact (SPST),
220V AC/30V DC, 1A (resistive load)
CN4420: 1 point, Other types: 2 points
_______________________________________________________
Heater burnout Relay contact (SPST),
alarm output 220V AC/30V DC, 1A (resistive load)
Not available on CN4420
_______________________________________________________
SETTING AND INDICATION
_________________________________________________________
Parameter setting method Digital setting with eight keys
_________________________________________________________
PV/SV display method CN4420: PV/SV red display, 4 digits
CN4520, CN4720, CN4620: Dual display for PV/SV
4 digits each, PV= red, SV= green
_________________________________________________________

12
_______________________________________________________
Status display Control output, alarm output, heater burnout
alarm output (on CN4520, 4620 and 4720 only).
_______________________________________________________
Indication accuracy Thermocouple: ±0.5% FS ±1 digit ±1°C
(at 23°C) R thermocouple: 0-400°C; ±1% FS ±1 digit ±1°C
B thermocouple: 0-500°C; ±5% FS ±1 digit ±1°C
RTD, voltage, current: ±0.5% FS ±1 digit
_______________________________________________________
GENERAL SPECIFICATIONS
_______________________________________________________
Rated voltage 85-264V AC, 50/60 Hz, or 24V AC/DC ±10%
_______________________________________________________
Power consumption 10VA or less (100V AC)
15VA or less (240V AC)
_______________________________________________________
Insulation resistance 50MΩor more (500V DC)
_______________________________________________________
Withstand voltage Power source-Earth: 1500V AC, 1 min
Power source-input terminal: 1500V AC, 1 min
Earth-relay output: 1500V AC, 1 min
Earth-Alarm output: 1500V AC, 1 min
Between other terminals: 500V AC, 1 min
_______________________________________________________
Input impedance Thermocouple: 1MΩor more
Voltage: 450KΩor more
Current: 250Ω(external resistor)
_______________________________________________________
Allowable signal Thermocouple: 100Ωor less
source resistance Voltage: 1KΩ or less
_______________________________________________________
Allowable wiring RTD: 10Ωor less per wire
resistance
_______________________________________________________
Reference junction ±1°C (at 23°C)
compensation accuracy
_______________________________________________________

13
_______________________________________________________
Process variable offset ±10% FS
_______________________________________________________
Setpoint variable offset ±50% FS
_______________________________________________________
Input filter 0-900.0 sec, setting in 0.1 sec steps
(primary lagging filter)
_______________________________________________________
Noise rejection ratio Normal mode noise (50/60Hz): 50dB or more
Common mode noise (50/60Hz): 140dB or more
_______________________________________________________
POWER FAILURE PROTECTION
_______________________________________________________
Memory protection: Non-volatile memory. Parameter values
remain unchanged with disruption of power.
Ramp/soak function has to be re-initiated.
_______________________________________________________
OPERATING AND STORAGE CONDITIONS
_______________________________________________________
Operating temperature -10 to 50°C (14 to 122°F)
_______________________________________________________
Operating humidity Less than 90% RH (non-condensing)
_______________________________________________________
Storage temperature -20 to 60°C (-4 to 140°F)
_______________________________________________________
ADDITIONAL FUNCTIONS
_______________________________________________________
8-segment ramp-soak: 4 ramp/4 soak with 16 different modes
Setpoint setting: 0-100% FS
Ramp/soak period: 0-99 hrs 59 mins
_______________________________________________________
Parameter mask: Parameters can be masked from being displayed
_______________________________________________________
Self-diagnosis: Watchdog timer monitors program error
_______________________________________________________

14
STRUCTURE
_______________________________________________________
Mounting method Panel mounting or surface mounting
Surface mounting: CN4420 only
_______________________________________________________
External terminal CN4420: 8-pin or 11-pin socket
Other types: screw terminal (M3.5 screw)
_______________________________________________________
Enclosure Black ABS plastic
_______________________________________________________
Dimensions CN4420 48 x 48 x 85.7mm (1/16 DIN)
1.89 x 1.89 x 3.37 in. (W x H x D)
CN4520 52.5 x 100.5 x 95.8mm (1/8 DIN)
2.07 x 3.96 x 3.77 in. (W x H x D)
CN4620 100.5 x 100.5 x 95.8mm (1/4 DIN)
3.96 x 3.96 x 3.77 in. (W x H x D)
CN4720 76.5 x 76.5 x 95.8mm (72 mm)
3.01 x 3.01 x 3.77 in. (W x H x D)
_______________________________________________________
Weight CN4420 approx. 150g (0.33 lb)
CN4520 approx. 300g (0.66 lb)
CN4620 approx. 400g (0.88 lb)
CN4720 approx. 300g (0.66 lb)
_______________________________________________________
Protective structure Front panel: NEMA 4X (equivalent to IEC IP66)
Protection against corrosion, windblown dust
and rain, and hose-directed water.
Rear case: IEC IP20; Protection against solid
objects up to 12mm.
_______________________________________________________
Installation category II
_______________________________________________________
Pollution degree 2
_______________________________________________________

15
OUTER DIMENSIONS AND PANEL CUTOUT SIZE
CN4420
48 (1.89)
F
C
PV H L
SEL DATA ENTPV/SV
SV
48 (1.89)
85.7 (3.37)
57 (2.24)
44.8 (1.76)
71.5 (2.81)
Panel
Gasket
7
9.5
(0.37)
(0.28)
48 (1.89)
57 (2.24)
Mounting bracket
Panel cutout size: when installing
“n” numbers of units.
A
A
B
B
Unit: mm (in.)
Panel thickness: 1 to 8 mm (0.04 to 0.31)
+0.5(0.02)
-0
B: 45 (1.77)
A: 63 (2.48) or more

16
CN4520, CN4720, CN4620
F
C1
PV
SV
A
B
95.8
DC
C2 H HBL
SEL DATA ENTSV
16.2
18.7 Panel
Gasket
Model
CN4520
CN4720
CN4620
A
52.5
76.5
100.5
B
100.5
76.5
100.5
C
90.5
67
90.5
D
114.5
91
114.5
E
45
68
92
0.6
-0
0.7
-0
0.8
-0
F
92
68
92
0.8
-0
0.7
-0
0.8
-0
G
120Min.
96Min.
120Min.
H
92Min.
116 Min.
140 Min.
2.07 3.96
3.56 4.51 1.77 0.02
-0 3.620.03 -0 4.72Min.3.62Min.
3.01 3.01 2.64 3.58 2.68 0.03
-0 2.680.03
-0 3.78Min.4.57 Min.
3.96 3.96 3.56 4.51 3.62 0.3
-0 3.620.03 -0 4.72Min. 5.51Min.
mm
in.
mm
in.
mm
in.
Units
E
F
G
H
Unit: mm (in.)
Panel thickness: 1 to 8 mm (0.04 to 0.31)
Panel cutout size: when installing
“n” numbers of units.

17
NEMA 4X Integrity
The front side of this instrument conforms to NEMA 4X. To ensure the
waterproofness between the instrument and the panel, use the gasket
that is provided with the unit according to the installation procedure
described below.
How to install the unit
For CN4520, CN4620, CN4720 Series install the two metal brackets, one
on the top and the other on the bottom, and tighten the screws to a
torque of about 14.7N-cm (1.5kg-cm). For CN4420 install the unit in the
panel as shown below, and tighten the screws on the mounting bracket
until the unit is secure. Make sure there is no space between the front
side of the unit and the gasket, and between the gasket and the panel.
Figure 1 Figure 2
Unit
Front Gasket Case
Unit
Panel Panel Mounting bracket Screw
Figure 3
Gasket Gasket
Case Case
(Bad) (Good)
Caution: After the mounting bracket is installed, check the gasket for
any displacement as shown in Figure 3.
INSTALLATION

WIRING INSTRUCTIONS
18
CN4421 (without alarm)
+–
1
3
45
6
7
8
Current output, DC SSR driver output
Contact output
RTD
*Voltage/current
Thermocouple
input
Power supply
(viewing from the back
of instrument)
B
B
A
–
+
–
+2~–
+
CN4421-A (with alarm)
1
2
3
45678
9
10
11 ~
+–
B
B
A
–
+
Current output, DC SSR driver output
Contact output
*Voltage/
current
Alarm output
Thermocouple
input
Power supply
(viewing from the
back of instrument)
–
+
RTD
–
+
–+
250Ω
* For current input, install the 250Ωprecision
resistor (accessory) before using the unit.
Warning
Be sure to use the rated power supply voltage and polarity.

19
7
8
9
7
8
+1
–3
1
2
3
4
5
6
~
7
8
9
10
11
12
13
14
15
16
17
18
1012
+
–
RTD
Current output,
DC SSR driver output +–
Control output 1
CN4720 Series
B
B
A
*Voltage/
Current
input
Power supply
T.C.
Alarm 1
(Upper limit alarm)
Alarm 2
(Lower limit alarm)
Heater burnout
alarm output
Common
CT input
Control output 2(on the cooling side)
Current output, DC SSR
driver output
–
+
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
3
2
1
2
1
+
–7
5
~
12
10 +
–
A
B
B
–
+
CN4520, CN4620 Series
2
1
RTD
*Voltage/
Current
input Current output, DC SSR
driver outputT.C.
Current output,
DC SSR driver
output Control output 1
Power supply
Control output 2
(on the cooling side)
Alarm 1 (upper limit alarm)
Alarm 2 (lower limit alarm)
Heater burnout alarm
Common
CT input
–
+

20
Wiring Power to the Controller
• Be sure to use the rated power supply voltage and polarity for the unit
to protect it against damage and failure.
• Keep the power off until all of the wiring is completed to prevent
electric shock and abnormal operation.
• Keep the power supply wires separated from the input and output
wires.
• Power connections should be made with 18-gauge or larger insulated
wire. Stranded wire improves noise immunity. Noise filters and isola-
tion transformers are recommended in case of noisy power lines.
• When the Heater Burnout option is selected, use the same power line
for both the controller and the heater.
Wiring Inputs
There are two input categories available: Thermocouple/RTD or
current/voltage. Make sure you have the right type before wiring the
inputs. Refer to Table of Input Type Codes and set the parameter
“P-n2” accordingly.
Note: In order to minimize the risk of high frequency noise induced by
coils and windings in relays, solenoids, and transformers, use leads
which have braided shield and ground one end of the sheath. Keep
your input leads separate from power and output leads. If you have to
bring the input signal from a long distance, a signal transmitter might be
needed to maintain an accurate reading; in this case, a unit that
accepts current/voltage input would be necessary.
Thermocouple
• Connect thermocouples directly to the input terminals whenever
possible.