Omega Products CN3251-DT User Manual

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⁄4 DIN Ramp/Soak Temperature/

Process Controller with Fuzzy Logic

CN3251

U Dual PID + Fuzzy

Logic Control

U Up to 5 Outputs–

Control, Alarm or Event

U Universal Sensor Input U Switching Power

Supply 100 to 240 Vac or Optional 12 to 24 Vac/Vdc

U 16-Segment

Ramp/Soak Program

U Optional RS232,

RS422, RS485 Digital Communications

U Programmable Remote

Setpoint Input (Standard)

CN3251 1⁄4 DIN

Panel punches

available, visit

omega.com/

panelpunches

The CN3251 1⁄4 DIN temperature and process controller is a cost effective, high-performance, single loop controller that can be used for temperature, ﬂow, pressure and level control applications. With universal sensor inputs and front panel operator setup, one CN3251 controller can be easily ﬁeld conﬁgured for a wide variety of applications, and simply reconﬁgured as application needs change. This makes it an exceptional choice for applications requiring multiple control needs, manufacturing facilities, testing facilities and testing applications.

Features 5 Possible Outputs for single output or

heat/cool control, plus up to 3 alarms or event outputs

Universal Sensor Input accepts thermocouple, RTD or analog signals; 24 Vdc output for loop power

Self-Tuning with Fuzzy Logic optimizes PID control and minimizes overshoot

Digital Input for remote switching of 1 of the following:

U PID1/PID2 U Remote/local setpoint U Main/auxiliary setpoint U Ramp/soak operation U Manual/auto control U Alarm reset for latching alarms

16-Interval Ramp/Soak Program with guaranteed soak, event outputs and looping

U Optional programmable analog U Programmable remote setpoint input

(standard on all products)

AUX Pushbutton and LED for front panel switching of:

U PID1/PID2 U Remote/local setpoint U Main/auxiliary setpoint U Ramp/soak operation U Manual/suto control

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Security Code Protection prevents

unauthorized access Setpoint Ramp Rate provides soft start

at power-up, or on setpoint changes, to prevent uneven heating and overshoot

Control Loop Protection provides process protection from:

U Open sensor U Shorted sensor U Sensor reversed U Control output open or shorted U Power control device open or shorted U Load power missing and

self-diagnostics

Operating Ambient up to 65°C (150°F)

OMEGACARESM extended

warranty program is available for models shown on this page. Ask your sales representative for full

Extended Warranty

Program

details when placing an order. OMEGACARE labor and equivalent loaners.

covers parts,

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Speciﬁcations

Control Modes: Automatic: On/off, proportional, PID,

PI, PD, PID + fuzzy logic, heat/cool (dual PID)

Control Adjustments: Control Setpoint: Sensor range Setpoint Limits: Sensor range Deadband: 1 to 100°F Proportional Band: Sensor range Manual Reset: –99.9 to 99.9 Automatic Reset: 0.00 to 99.99

repeats per minute

Rate: 0 to 500 seconds Output Cycle Time: 0.1 to

60.0 seconds

Output Limit: 0.0 to 100.0% Open Sensor/Out of Range Output Command: 0.0 to 100.0% Display Offset: –100 to 100°F Heat/Cool Adjustments: Output Offsets: 0 to 100% of

proportional band

Cooling Medium: Air, water or oil Alarm Adjustments: Setpoints: High and low settings for

each alarm output Alarm Types: Absolute: High, low and high/low, Tracking: +deviation, –deviation, and ±deviation Relay Action: Latching or nonlatching, energized or de-energized Alarm Deadband: Adjustable,

-18 to 38°C (0 to 100°F) Alarm Inhibit: On power-up, enabled or disabled Control/Alarm Outputs: Total of 5 control/alarm outputs possible Relay: Form A contacts, 1.0 A at 120/230 Vac (resistive load) Solid State Relay Drive: 24 Vdc nominal at 40 mA Triac: 1 A continuous, 10 A in-rush @ 120 or 230 Vac Current/Voltage: 4 to 20 mA into 0 to 800 Ω, ﬁeld-changeable to 1 to 5 Vdc

Output #5 (Optional): Relay: N.O. form “C” contact,

5 A @ 120 or 2.5 A 230 Vac Sensor Input: Field-selectable thermocouple, RTD, current or voltage

Input Update Rate: 2 samples/s Ramp/Soak Programming: Intervals: 16 Loops: 1 loop, 0 to 255 times

or continuous

Event Outputs: Up to 3 Guaranteed Soak Differential: Off,

1°F to sensor span Time Units: Seconds, minutes, hours (1 s to 99.99 hours/segment) Ramp to Setpoint: 1 to 9999°/hour on power-up

Open Sensor and Out-of-Range Condition: Programmable control

action with display indicating condition “OPEN SENS”

Front Panel

Yellow LED’s

indicate control

output #1 or #2 on.

Yellow LED’s

indicate alarm or

event output on.

- Process variable display in operation mode.

- Alphanumeric menu display in setup mode.

(4 Red, 7-Segment LED’s)

RESET

Pushbutton

- Alarm reset.

- Hold for more than 3 seconds to enter or exit setup mode.

- Scrolls through menu in setup mode.

AUX

Programmable

Pushbutton

- PID1/PID2 toggle switch.

- Auxiliary setpoint enable.

- Remote setpoint enable.

- Output disable.

- Ramp/soak operations.

- Auto/manual selector.

Remote Setpoint Input: Input Signal: 4 to 20 mA, 250 Ω input

impedance, 1 to 5 Vdc, 110 KΩ input impedance, voltage or current ﬁeldselectable via switch Range: Programmable over-selected sensor span Accuracy: ±0.3% of sensor span (initial accuracy) at 24°C (75°F) ambient temperature and rated line voltage, ﬁeld calibrate to ±0.2% of sensor span

Digital Input: Accepts dry-contact closure Analog Output Option: Assignable Functions: Process

variable, output #1 command, active setpoint, output #2 command Output Signal: 4 to 20 mA into 0 to 800 Ω load, 1 to 5 Vdc into 100 KΩ or greater load selectable via DIP switch Range: Programmable over selected sensor span for retransmission of process variable and active setpoint, ﬁxed to 0 to 100% for transmission of output commands Accuracy: ±0.2% of programmed span, ±1 LSD

Digital Communications (Optional): RS232: Single-drop, isolated RS422/485: Multi-drop, isolated, ﬁeld

selectable by switch

Lower Display

(4 Green 7-Segment LED’s)

- Active setpoint display in operation mode.

- Menu value display in setup mode.

Upper Display

Baud Rates: 1200, 2400, 4800,

9600, 19.2 K Protocols: ASCII line, computer interface Instrument Power: 100 to 240 Vac, 10%, -15%; 12 to 24 Vac/Vdc, ±10%; 50 to 60 Hz Operating Environment: 0 to 65°C (32 to 150°F) ambient temperature, relative humidity <95%, non-condensing

Dimensions: Overall: 97 H x 97 W x 97 mm D

(3.8 x 3.8 x 3.8")

Depth Behind Panel: 97 mm (3.8") Front Panel Projection: 20 mm (0.8") Panel Cutout: 91 x 91 mm (3.6 x 3.6") Weight: 454 g (1 lb) Case Material: High-impact, black

ABS plastic

Inﬂuence of Line Voltage Variation:

±0.1% of sensor span/10% change in nominal line voltage

Noise Rejection: Common Mode Noise:

140 dB at 60 Hz Series Mode Noise: ±0.1% of sensor span with 300 mV peak-to-peak, 50 or 60 Hz series mode noise RFI: Typically less than 0.5% of sensor span at a distance of 1 m (3.1') from transmitter (4 W, 464 MHz)

Front Panel

Setup of all control

parameters

and selections.

Green LED’s

indicate °C or

°F selected for process

variable.

Yellow LED

indicates

an auxiliary

function

is active.

- In operation mode, pushbuttons adjust setpoint.

- In setup mode, pushbuttons increase/decrease menu values.

- While holding reset pushbutton, increase/decrease page.

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Input Types and Ranges

Dimensions

Chroma Dimen 2col.ill

Accuracy @ 25°C (77°F) Ambient Input Type Range (All ±% of Sensor Span)

Iron -73 to 760°C 0.2%

Constantan -100 to 1400°F CHROMEGA

ALOMEGA® -300 to 2400°F Copper -212 to 399°C 0.4% for PV <-80°C

Constantan -350 to 750°F 0.2% for PV >-80°C CHROMEGA

Constantan -100 to 1100°F Pt-13%Rh/Pt -18 to 1760°C 0.4%

0 to 3200°F Pt-10%Rh/Pt -18 to 1760°C 0.4%

0 to 3200°F Pt-30%Rh/ 10 to 1816°C 0.4% for PV >538°C

Pt-6%Rh 50 to 3300°F Pt, 385 -128 to 538°C 0.2%

100 Ω -200 to 1000°F

-73.3 to 482.2°C

-99.9 to 899.9°F 4 to 20 mA Scalable (-500 to 5000) 0.2%

0 to 5 Vdc Scalable (-500 to 5000) 0.2% 1 to 5 Vdc Scalable (-500 to 5000) 0.2%

-184 to 1316°C 0.2%

-73 to 593°C 0.2%

CN3101 Series companion limit controller—accepts thermocouple, RTD and process signals.

(3.8)

CN3101 High/Low Limit Controller

OUT 1

OUT 2

OUT 3

OUT 4

CN3251 Process Controller

AUX

CN3251 Process Controller

(0.8)

AUX

3251

(3.8)

(3.6)

OUT 1

OUT 2

OUT 3

OUT 4

RESET

Dimensions: mm (inch)

AUX

PAGE PAGE

➡

2104

ϒF

ϒC

AUX

➡

(3.8)

(3.5)

(3.6)

Panel Cutout

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To Order Visit omega.com/cn3251 for Pricing and Details

Model Number Description CN3251(*) Ramp/soak controller with fuzzy logic

Comes complete with operator’s manual.

Specify output code from Single or Dual Output option tables below.

Ordering Examples: CN3251-R, ramp and soak controller with a relay/DC pulse heat output. OCW-2, OMEGACARESM extends standard 3-year warranty to a total of 5 years. CN3251-FR, ramp and soak controller with a 4 to 20 mA heat output, relay cool output. OCW-2, OMEGACARESM extends standard 3-year warranty to a total of 5 years.

Single Output Options (No Additional Charge)

Output Sufﬁx Output #1 Type

-R Relay/DC pulse**

-T AC SSR

-F 4 to 20 mA***

Field selectable.

Field selectable for 1 to 5 Vdc.

***

Dual Output Options (Field Installable)

Order Sufﬁx Description Output #1 Output #2

-RR Relay Relay

-TT AC SSR AC SSR

-FF 4 to 20 mA*** 4 to 20 mA***

-DD DC pulse DC pulse

-FR 4 to 20 mA*** Relay

-FT 4 to 20 mA*** AC SSR

-DR DC pulse Relay

-DT DC pulse AC SSR

Field selectable for 1 to 5 Vdc.

***

Options Ordering

Code Description

-TPS 24 Vdc transmitter isolated

output 65 mA

-LV1 2 to 24 Vdc/Vac power

-A1 Dual alarm/event relays

(shared common terminal)

-S22 RS232 digital communications, with one alarm/event relay

-S42 RS422/485 digital communications, with one alarm/event relay

-PV2 Recorder output, 4 to 20 mA/1 to 5 Vdc

-S2-PV2 RS232 digital communications, one alarm/event relay and recorder output

-S4-PV2 RS422/485 digital communications, one alarm/event relay and recorder output

These options can be ordered with any model number.

Only 1 of these options can be ordered at a time.

Cannot be ordered with option “A”.

CN3251-R shown smaller than actual size.

Accessories

Model No. Description 3250X-R Relay/DC pulse output module 3250X-T AC SSR output module 3250X-FF*** 4 to 20 mA/4 to 20 mA output module 3250X-RR Relay/relay output module 3250X-TT AC SSR/AC SSR output module

3250X-DD DC pulse/DC pulse output module 3250X-FR*** 4 to 20 mA/relay output module 3250X-FT*** 4 to 20 mA/AC SSR output module 3250X-DR DC pulse/relay output module 3250X-DT DC pulse/AC SSR output module 3250X-S2 RS232 digital communications board 3250X-S4 RS485/422 digital communications board

3250X-CASE-COMM† Housing for CN3251s with digital communications 3250X-CASE Housing for CN3251s without digital communications

3250X-SBKT Side mounting bracket CN3200-SOFT-WIN2 Software for communications option, Windows version CNQUENCHARC Noise suppression RC snubber (2 leads), 110 to 230 Vac

Field selectable for 1 to 5 Vdc. †Special controller case required when adding -S2 or -S4 to controllers.

***

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