Omega Products CN491A-D1 Installation Manual

CN491A SERIES

1/32 DIN Temperature/Process Contr ollers

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User ’s Guide

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WARNING: These products are not designed for use in, and should not be used for, patient-con­nected applications.

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1

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Fuzzy Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Input Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Model Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Wiring & Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Negotiating the menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Learning the parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Primary Program Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Changing Setpoint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Begin Controlling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Flow Chart of Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Auto-tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Setting Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Scaling Analog Inputs/Setting Setpoint Limits . . . . . . . . . . . . . .24

Ramp Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Ramp & Soak/Dwell Function . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Tool Program Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Flow Chart of Tool Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Manual Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Programmable Control Action . . . . . . . . . . . . . . . . . . . . . . . . . . .33

Cooling Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Configurable Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Locking Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

1

2

INTRODUCTION

General Description

The CN491A is a fully programmable, microprocessor-based
temperature/process controller. It offers superior control with 200
msec sampling rate and by using fuzzy logic to enhance its P, I and
D parameters. The 4-digit 0.4” red LED display offers excellent
visibility on a unit that is 1/32 DIN in size.

The CN491A is available with either 20-32V AC/DC or 90-264V AC
power supply. This is a single universal input unit that will accept
8 different thermocouple types, Pt100 RTDs, and a variety of linear
mA and VDC signals. The wide range of options for the two avail­able outputs include relays, SSR drives, 4-20mA, 0-20mA, or
0-10VDC. Output #1 can be used in either a direct or reverse
action control situation with a programmable ramp rate. Output #2
can be used as a control output, as an alarm, or as a dwell timer.

Optional features include 2-wire RS-485 serial communications
with Windows 95

™

-based software, and Analog Retransmission of
process variable, setpoint variable or the percentage of control
output, as a 0-20 mA/4-20 mA DC signal.

The communications software package, CN491A-SOFT, offers
excellent graphics, bar and trend displays, and supports easy-to­use database control and back-up capability.

FUZZY LOGIC

The function of Fuzzy Logic is to adjust the PID parameters
internally in order to make the control output more flexible and
adaptive to the process. One of the best analogies would com­pare Fuzzy Logic to the abilities of a good driver. The driver is

2

33

Figure 1. PID only

Figure 2. PID with fuzzy logic

Figure 3. PID vs. PID and fuzzy logic

PID control with proper tuning

PID + Fuzzy control

able to control a car well at a variety of speeds and under varying
circumstances by using knowledge gained through previous
experience.
Fuzzy Logic combined with PID control has been proven to be an
efficient method to improve control stability. This is illustrated in
figure 3.

44

SPECIFICATIONS

INPUT

Thermocouple(T/C): Type J,K,T,E,B,R,S,N
RTD: Pt100 ohm RTD

(DIN 43760/BS 1904 or JIS)
Linear: Scalable. Refer to table on p.5
Range: User configurable, refer to table on p.5
Accuracy: Refer to table on p.5
Cold-Junction Compensation: 0.1°C / °C ambient (typical)
External Resistance: 100 ohm max.(for thermocouple)
Normal Mode Rejection: 60dB
Common Mode Rejection: 120dB
Sample Rate: 200 msec

CONTROL

Proportional Band: 0-360°F, 0-200°C, 0-3600 Process Units
Reset (Integral): 0-3600 seconds
Rate (derivative): 0-1000 seconds
Ramp rate: 0-55.55°C/min, 0-99.99°F/min,

0-99.99 Process Units(P.U.)/min
Dwell: 0-9999 minutes
Hysteresis: 0.1-11.0°C, 0.1-19.9°F, 0.1-199 P.U.
Cycle Time: 0-99 seconds
Control Action: Direct (cooling) and reverse(heating)

OUTPUT

Relay: 3A/240 VAC (resistive)
DC pulse: 24 VDC/20 mA max.
4 to 20 mA: Linear, max. load 500 ohms
0 to 20 mA: Linear, max. load 500 ohms
0 to 10 V: Linear, min. input impedance 500K ohms

INDICATION

Process Display: 0.4” red LED, 4 digits
Status Indicator: Control output and alarm

55

POWER

Rating: 90-264VAC nominal, 264V excursion (max)

50/60Hz or 20-32V AC/DC

Consumption: Less than 5VA

ENVIRONMENTAL & PHYSICAL

Safety: CE & CSA Approved, & UL Recognized
Protection: NEMA 4X (indoor use), IP65
Operating Temperature: -10 to 50°C (14 to 122°F)
Humidity: 0 to 90%RH (non-condensing)
Insulation: 20 Mohm min. (500 VDC)
Breakdown: AC2000V. 50/60Hz. 1 minute
Vibration: 10-55Hz. amplitude 1mm
Shock: 200 m/s

2

(20g)
Weight: 110 grams
Dimension: 24(H) x 48(W) x 99mm (depth behind panel)
Panel cutout: 22.2mm(H) (+.3/-0) 45 mm(W) (+.5/-0)

RANGE AND ACCURACY OF INPUTS

SENSOR INPUT TYPE RANGE (°F) RANGE (°C) ACCURACY

J Iron-Constantan -58 to 1830 -50 to 999 ±3.6°F/±2°C
K CHROMEGA−

ALOMEGA



-58 to 2500 -50 to 1370 ±3.6°F/±2°C
T Copper-Constantan -454 to 752 -270 to 400 ±3.6°F/±2°C
E CHROMEGA-Constantan -58 to 1382 -50 to 750 ±3.6°F/±2°C
B Pt30%Rh/Pt6%Rh 572 to 3272 300 to 1800 ±3.6°F/±2°C
R Pt13%Rh/Pt 32 to 3182 0 to 1750 ±3.6°F/±2°C
S Pt10%Rh/Pt 32 to 3182 0 to 1750 ±3.6°F/±2°C

N Nicrosil-Nisil -58 to 2372 -50 to 1300 ±3.6°F/±2°C
RTD Pt100 ohm (DIN) -328 to 842 -200 to 450 ±0.72°F/±0.4°C
RTD Pt100ohm (JIS) -328 to 842 -200 to 450 ±0.72°F/±0.4°C

LINEAR INPUTS (All scalable)
Input type Range Accuracy

4-20 mA, 0-20 mA, 0-1V, 0-5V, 1-5V, 0-10V -1400 to 9400 ±0.05% FS

66

CN491A MODEL CONFIGURATION

Model No Description

CN491A-R1 Relay Output
CN491A-D1 DC Pulse Output
CN491A-F1A 4-20mA Output
CN491A-F1B 0-20mA Output
CN491A-V1 0-10V Output

SECOND OUTPUT/ALARM

Suffix Description

-R2 Relay

-D2 DC pulse

-F2A 4-20mA

-F2B 0-20mA

-V2 0-10V

AUXILIARY OPTIONS

Suffix Description

-C4 RS-485 Communications

-PVSV 0-20mA/4-20mA retransmission

OPTIONAL POWER SUPPLY

Suffix Description

-LV 20-32V AC/DC

7

INSTALLATION

MOUNTING

Install mounting clamp(s). Gently tighten clamp until the controller
fits snugly against the front panel.

Make panel cutout as
shown in figure

WIRING

The following connections for outputs and inputs are provided on
the wiring diagram located at the rear of the housing:

7

NEMA brackets Collar bracket

1/32 DIN

Rear Terminal Connections

88

POWER SUPPLY

The controller is supplied to operate on either 90-264V AC or 20­32V AC/DC. Check that the supply voltage corresponds to that
indicated on the product label before connecting power to the
controllers.

This equipment is designed for installation in an enclosure which
provides adequate protection against electric shock. The enclo­sure must be connected to earth ground.

THERMOCOUPLE INPUT

Thermocouple input connections are shown in the illustration
below. The thermocouple extension wire must be of proper type
and gauge, and should be run in a conduit, separate from any
power wiring. The resistance of the entire run should not exceed
100Ω.

Pt100 Ohm RTD INPUT

RTD connections are shown in the illustration below with the
compensating lead connected to terminal 11. For two-wire
RTD inputs, terminals 10 and 11 should be linked.

Power Supply Connections

Thermocouple Input Connections

RTD input Connections

Pt100

90~264V AC or
20-32V AC/DC

L
N

1A

9

DC LINEAR INPUT

DC linear voltage and current input connections are shown below.

RELAY OUTPUT DIRECT DRIVE

The illustration below shows connections for using the internal
relay to drive a small load. The current should not exceed 3 amps.

RELAY OUTPUT CONTACTOR DRIVE

The illustration below shows connections for using an external
relay to drive heavier loads.

9

VDC

mADC

Relay Contactor Drive Connections

Relay Direct Drive Connections

10

DC PULSE (SOLID-STATE RELAY DRIVE) OUTPUT

Controllers fitted with the DC pulse output produce a time-propor­tional non-isolated pulse voltage (0-24V nominal, output imped­ance 660Ω). The connections are shown in the illustration below.

DC LINEAR OUTPUT

There are three types of linear output modules that can be select­ed for the output. The connections are shown in the illustration
below.

RS-485 COMMUNICATIONS/ANALOG RETRANSMISSION

RS-485 serial communications or Analog retransmission of
process variable, setpoint, or manipulated variable can be select­ed as an optional feature. The connections are shown in the illus­tration below.

10

Pulsed DC output Connections

Linear DC output Connections

RS-485 Communications

Analog retransmission

2nd

/

1

2nd

/

1

13
14

13

14

TX1
TX2

11

11

NEGOTIATING THE CN491A MENU

When the controller is powered up it automatically displays the
Process Variable (PV).

From the Process Variable (PV) display you can easily:
Press either the or key momentarily to view set-point.

or
Press the key momentarily to enter the Primary Program Menu.
or
Press the key and the key simultaneously to enter the
Tool Program Menu.

CN491

TOUCH KEYS FUNCTION DESCRIPTION

Up key Press to select digit to change. Press and hold

to increase value for parameter

Down key Press to select digit to change. Press and hold

to decrease value for parameter

Scroll key Press to select parameter in direct sequence

or to select tool program parameters

Long scroll/ Use to select protected parameters in higher

press for 3.2 seconds Enter key security level or to actuate selected tool program

&

&

press for 3.2 seconds parameters

&

&

&

press for 3.2 seconds start autotune.

Reverse scroll/ Use to select parameter in reverse sequence or
Calibration to verify display accuracy for input types during
Verification calibration

Lock key Use to disable keypad operation to protect

Tool program key Press to select tool program in sequence
Reset/Exit key Press to unlock keypad operation, to reset

display, to exit tool program, or to end autotune
and manual control execution.

Autotune key Hold both keys for 3.2 seconds then release to

1212

LEARNING THE PARAMETERS

SV - Setpoint

This parameter is the target value for the process. It can be
adjusted throughout the range defined by the Low Scale Value

and High Scale Value

.

Set in degrees/engineering

units.

ASP1 - Alarm 1 Setpoint or Dwell Time

If output #2 is configured as an alarm this parameter sets the point
that the alarm will be activated. If output #2 is configured as a
Dwell Timer this parameter sets the amount of time to be counted.
Set in degrees/engineering units for alarms or minutes for timer.

Ramp - Ramp Rate

This determines the rate at which your process will approach set­point. Setting this parameter to 0 will cause your system to
approach setpoint at maximum speed. Set in degrees/minute.

OFST - Offset Value for Manual Reset

For systems using proportional control only (Ti set to 0) this para­meter will be adjusted to compensate for any deviation between
setpoint and process. Set 0-100% of Pb.

SHIF - Shift Process Value

This value will be added to the process value to correct for errors
or to synchronize a number of different units. Set in degrees/engi­neering units.

PB - Proportional Band

The proportional band is that area around main setpoint
where the control output is neither full on nor full off.

HYST - Hysteresis for ON/OFF Control

The hysteresis for output #1 is the area around the main setpoint
where the output does not change condition. It is intended to
eliminate relay chatter at setpoint for ON/OFF control applications.

1313

Code for “Addr” Retransmission

192 4~20mA, PV
193 4~20mA, SV
194 4~20mA, MV1 (Output 1)
195 4~20mA, MV2 (Output 2)
196 0~20mA, PV
197 0~20mA, SV
198 0~20mA, MV1 (Output 1)
199 0~20mA, MV2 (Output 2)

TI - Integral Time

The integral time is the speed at which a corrective increase or
decrease in output is made to compensate for offset which usually
accompanies proportional only processes. The more the integral time
entered, the slower the action. The less the integral time entered, the
faster the action. Enter a value that would eliminate offset without
overcompensation, resulting in process oscillation.

TD - Derivative Time

The derivative time is that time used in calculating rate of change
and thermal lag in helping eliminate overshoot which results in
response to process upsets. This overshoot usually accompanies
proportional only and proportional integral processes. The deriva­tive action dampens proportional and integral action as it antici­pates where the process should be. The more the derivative time
entered, the more the damping action. The less the derivative time
entered, the less damping action. Enter as much derivative time as
necessary to eliminate overshoot without overdamping the process
resulting in process oscillation.

ADDR -

Address of unit for serial communications/ Retransmission

This unit can be assigned a numerical address to identify it as one
of 191 stations on an RS-485 serial communications loop (set from
1-191) or for 4-20mA/0-20mA retransmission (set from 192-199).

1414

LOSC/HISC - Low/High Scale Range

If a thermocouple or RTD is being used these parameters will
establish the allowable range for the setpoint. If an analog input is
being used these parameters will establish the scaling range for
the process signal and the allowable range for the setpoint. Set in
temperature/engineering units.

PL1/PL2 - Power Limit for Heating and Cooling Outputs

These parameters limit the maximum percentage of power for the
control outputs. These are used on systems that cannot tolerate
100% power. Set from 0-100%.

INPT - Input Type Selection

Used to indicate what type of sensor input will be connected.

See

Range and Accuracy of Inputs on page 5 for available input types.

UNIT - Process Unit

Used to select the correct engineering units for the process.
(PU for Analog inputs, C or F for temperature applications).

RESO - Decimal Point Resolution

This parameter defines the position of the decimal point for the
process value and setpoint value. Set to 0,1 or 2 positions right
of the decimal point. (2 positions is reserved for linear inputs
only.)

CONA - Control Action of Output #1

Determines whether the output will be reverse acting, as in a
heating application, or direct, as in a cooling application. See
programmable control action on page 33.

A1MD - Alarm Mode Selection for Alarm #1

Refer to page 22 for the various alarm types available.

1515

A1SF - Alarm #1 Special Function

Selects a hold function or latch function for alarm #1. Also, used to
reconfigure alarm #1 as a dwell timer. Refer to page 22 for more infor-

mation. Set to

for cooling action on output #2.

CYC/CCYC - Proportional Cycle Time for Outputs #1 & #2

These parameters determine the duration of the duty cycle for time
proportioned outputs. Set from 0-99 seconds. Set to 0 for linear out­puts.

CPB/DB - Cooling Proportional Band/Dead Band

Used only when output #2 is configured for cooling applications.
Refer to page 34 for a more detailed explanation.

1616

PRIMARY PROGRAM MENU

Press the key momentarily to enter the Primary Program
Menu.

Press the key momentarily to scroll through the Primary Pro­gram Menu.

Pause momentarily on a parameter to be changed. After 3.2 sec
the display will begin to toggle between the parameter and its cur­rent value.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to increment or
decrement the desired position.

Press the key momentarily to continue scrolling through the
Primary Program Menu.

When you’ve reached the last parameter in a given level, press
and hold the key until that parameter stops flashing. This will

advance you to the next level of the Primary Program Menu.

1717

CHANGING SETPOINT (SV)

Press either the or key momentarily to view set-point

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to increment or decre­ment the desired position.

After approximately 10 seconds the unit will automatically return
to reading the Process Variable (PV).

BEGIN CONTROLLING

1. Insure that the controller is properly wired for your application.
As soon as the unit is powered up it will begin trying to
control at the current setpoint.

2. Check the display of the controller. Make sure that it is
reading the actual temperature/engineering units.

3. If everything looks correct set the desired setpoint, go to the
auto-tune procedure (page 20) and initiate it. When autotune is
complete your system will be ready.

4. If you experience problems go to the troubleshooting section
(p.38).

1818

FLOW CHART OF PARAMETERS

The following chart shows a typical (default) access sequence of parameters.

Normal Display Process value / setpoint value

Alarm 1 Set Point Value or Dwell

Time ( = or )

or

or

or

or

or

or

or

or

or

or

or

or

Long

Long

Ramp Rate

Offset Value for Manual Reset

(Integral Time TI=0 )

Shift Process Value

Proportional Band of Output 1

Integral (Reset) Time of Output 1

Derivative (Reset) Time of Output 1

Hysteresis of Alarm 1

Hysteresis of ON-OFF control

Address of the unit for the

communication

Low Scale of Range Adjust

for your process

High Scale of Range Adjust for

your process

Power Limit of Output 1

Power Limit of Output 2

Input Type Selection

Low scale~high scale value (for Full Scale Alarm), -111.0 ~ 111.0°C or -199.9 ~199.9°F

(for Deviation and Deviation Band Alarm), 0~9999 minutes (for Dwell Time) **18.0°F

0-55.55°C/minute or 0 ~ 99.99°F/minute **0.00

0~100.0% **0.0

0~200.0°C or 0~360.0 °F, 0-3600 P.U.

0:For ON-OFF control

**18.0°F

-111.0~111.0 °C or -199.9~199.9°F **0.0°F

0~3600 seconds**120

0~1000 seconds**40

0~11.0°C or 0.1~ 19.9°F **00.1°F

0~11.0°C or 0.1~ 19.9°F **00.1°F

0~40 **00

Minimum value for the selected input (INPUT) to

High Scale (HISC) **000.0°F

Low Scale (LOSC) to maximum value for the

selected input (INPUT) **999.9°F

0~100%

**100

0~100%

**100

:J TYPE T/C

:K TYPE T/C

:T TYPE T/C

:E TYPE T/C

:B TYPE T/C

:R TYPE T/C

:S TYPE T/C

:N TYPE T/C

:PT100 DIN

:PT100 JIS

:4~20MA

:0~20MA

:0~1V

:0~5V

:1~5V

:0~10V

:degree C

:degree F

:process unit

Voltage or

Current Input)

Level 0

Level 1

or

or

or

Low scale to high scale value **212.0°F

:Deviation High

Alarm.

:Deviation Low

Alarm.

**

or

**

**

1919

Low Alarm.

High Alarm.

:Deviation Band

:Deviation Band

Alarm.

Alarm.

Full Scale Low

:Full Scale High

:No Decimal

Point Used

**

or

or

:1 Digit Decimal

:2 Digit Decimal

:Direct

(Cooling)

Action.

:Reverse

or

(only for Linear

Voltage or

Current Input)

(Heating)

Action.

**

or

or

:No Special Function

**

:Alarm with Hold Function

:Alarm with Latch Function

0~99 Seconds, 0 for

Linear current/Vol-

tage output. **20

0~99 Seconds, 0 for

Linear current/Vol-

or

or

:Alarm with Latch & Hold Function

:Dwell Timer ON as Time Out.

:Dwell Timer OFF as Time Out.

:Proportional cooling

tage output. **20

0.0~200.0°C or 0.1~

360.0°F **18.0°F

-111.0~111.0°C or

-199.9~199.9°F,

**000.0°F

or

or

Resolution Selection

Select Unit

Alarm 1 Mode

Control Action of Output 1

Level 2

Alarm 1 Special Function

Proportional Cycle Time of Output 1

Cooling P Band

Cooling Cycle Time

Dead Band for PB and CPB

Note: Using the Tool Program the display sequence and the security level for any parameter are configurable. Also, any unused

parameter can be removed from the display sequence to simplify the operation.

**: Denotes the default setting

Long : Press and hold for at least 3.2 seconds

2020

AUTO-TUNING

Auto-tune is a procedure that will oscillate your process around
setpoint twice, testing the dynamics of your system and automati­cally setting the P, I, and D parameters.

You should auto-tune your system:

- during initial set-up.

- if setpoint is changed by a large amount.

- if sensor or output is changed.

TO COMPLETE THE AUTO-TUNE PROCEDURE;

1. Make sure all parameters are configured correctly.

2. Have system under normal load conditions.

3. Make sure Pb(Proportional band) is not 0.

4. Set the setpoint to the normal operating temperature.
Note: If system overshoot is likely to cause damage, reduce the

setpoint during autotune.

5. Press and hold the and keys for 3.2 seconds and then

release. The display will begin flashing and will continue to
flash throughout the auto-tune process.

Note: To abort the autotune process, press and release the

and keys during the first oscillation of the process.

21

ALARMS

This controller is available with a second output that can be con­figured for a variety of alarm types. The following parameters in
the Primary Program Menu are used to configure the alarms;

Alarm 1 setpoint - This parameter determines the point

that alarm 1 will be activated.

Example: Deviation high alarm with no special function

SV= 100°C, ASP1= 10°C, AHY1= 4°C

Alarm 1 Hysteresis - This parameter establishes an area
around Alarm 1 setpoint where the alarm relay will not
change states.

21

Alarm ON

Low Alarm

Setpoint

Alarm OFF Alarm OFF

Low Alarm
Hysteresis

Main

Setpoint

High Alarm

Hysteresis

Alarm ON

High Alarm

Setpoint

22

Alarm 1 mode - This parameter determines the alarm

type that is to be used, such as a deviation alarm, a
band alarm, or an absolute alarm.

Alarm 1 Spec. Func.- This parameter assigns special

functions to Alarm 1 such as a holding feature
that prevents an alarm during start up or a latch func-
tion that prevents the alarm from clearing
unless power is interrupted.

Example: Deviation low alarm with Hold function.

22

Code

1 Full scale high

Type

Alarm Set point

PV

2 Full scale low

Alarm Set point

Alarm Set point

3 Deviation high

Set point

Alarm Set point

4 Deviation low

Set point

Alarm Set point

7 Deviation band high

Set point

8 Deviation band low

Set point

PV

PV

PV

PV

PV

2323

SETTING ALARMS

To set an alarm:

Press the key momentarily to enter the Primary Program
Menu.

Press the key momentarily to scroll through the Primary Pro­gram Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current setting.

Press and hold either the or key to select the desired
alarm type.

Press the key momentarily to continue scrolling through the
Primary Program Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current setting.

Press and hold either the or key to select the desired
alarm special function.

Press the key momentarily to continue scrolling through the
Primary Program Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current setting.

2424

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to select the desired
alarm set point.

Press the key momentarily to continue scrolling through the
Primary Program Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current setting.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to select the desired
amount of alarm hysteresis.

SCALING ANALOG INPUTS/SETTING SETPOINT LIMITS

When an analog input such
as 4-20 mA signal is applied
to this unit it is necessary to
tell the unit how this signal
is to be scaled.

SCALING 1-5V dc AND 4-20mA dcINPUT RANGES

Example: Program a 4-20mA dc signal for 0 to 100 P.U.

Input Type

4-20mA dc

Program to 0
to 100

Full Range = (100-0) = 100 Engineering Units

-5 0 100 105
5% 5%

Minimum/Maximum Range

-1400...9400 Enginerring Units

Setpoint Range

Indicating Range

2525

When a thermocouple or RTD
is applied to this controller it
may be necessary to establish
limits that the setpoint can be
set within in order to protect
the system from over/ under­temperature situations.

Parameters (zero
point/lower setpoint limit) and (span point/upper setpoint

limit) are used to scale analog inputs or to establish setpoint
limits.

TO SET THESE PARAMETERS;

Press the key momentarily to enter the Primary Program
Menu.

Press the key momentarily to scroll through the Primary Pro­gram Menu until you come to / .

Pause momentarily. After 3.2 sec the display will begin to toggle
between / and its current setting.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to enter the desired
value.

SCALING THERMOCOUPLE AND RTD(Pt100) INPUT RANGES

Example: Program a J thermocouple for 50 to 500 F

Minimum/Maximum Range

32 . . . . . . . . . . . . .1832 F

Setpoint Range

Input Type

J Thermocouple

Program to 50
to 500

Full Range = (500-50) = 450 F

27.5 50 500 522.5
5% 5%

Indicating Range

2626

RAMP FUNCTION

If the ramp function is enabled the process will increase or
decrease, during initial power up and setpoint changes, at a rate

determined by the parameter which can be adjusted in
units/minute. This function will be disabled when is set

to zero.

TO SET A RAMP RATE;

Press the key momentarily to enter the Primary Program
Menu.

Press the key momentarily to scroll through the Primary Pro­gram Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current value.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to increment or decre­ment the desired position.

Press the key momentarily to continue scrolling through the
Primary Program Menu.

Change of Setpoint

2727

RAMP & SOAK/DWELL FUNCTION

A dwell timer has been incorporated into this controller.
Alarm #1 can be configured by setting = or

to provide either a dwell function or a soak function to be

used in conjunction with the ramp function.
The ramp and soak function will allow the system to be pro-

grammed to approach setpoint at a specific ramp rate, hold the
setpoint temperature for a set amount of time and then shut off the
alarm relay. When the output is wired in series with the alarm
relay, the output will turn off when the alarm relay shuts off. This
will end the soak cycle and return the process to ambient condi­tions until the controller is reset.

TO SET A SOAK/DWELL TIME

Follow the procedure outlined in Ramp Function to set a ramp rate.
While in the Primary Program Menu continue to scroll until you

come to parameter .
Pause momentarily. After 3.2 sec the display will begin to toggle

between and its current value.

continued on page 28

2828

Press and hold either the or key to increment or decre­ment to the desired position, to turn the relay on after the
amount of time defined by or to turn the relay off

after the amount of time defined by .

Press the key momentarily to continue scrolling through the
Primary Program Menu until you come to parameter .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current value.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to increment or
decrement the desired time setting.

2929

TOOL PROGRAM MENU

Press the key and the key simultaneously to enter the
Tool Program Menu.

Press the key and the key simultaneously to scroll
through the main headings of the Tool Program Menu.

Press the key to access the parameters under each main
heading within the Tool Program Menu.

Pause momentarily on a parameter to be changed. After 3.2 sec
the display will begin to toggle between the parameter and its cur­rent value.

Press either the or key momentarily to highlight the
numerical position to be changed.

Press and hold either the or key to increment or decre­ment the desired position.

Press the key momentarily to continue scrolling through the
parameters within that heading,

or

Press the key and the key simultaneously to continue
scrolling through the main headings of the Tool Program Menu.

Enter the manual control mode.

Allow to adjust the percentage value of

Heating output by using or . 000~100%

Flow Chart of Tool Programs

View the percentage power

of Heating output.

or

or

or

or

View the percentage power

of Cooling output (Alarm).

View the maximum (peak) process value.

View the minimum (peak) process value.

Adjust the cold-junction

compensation code.

(-19.9~42.7 count)

Adjust the drift

compensation code.

(-6.6~6.6 count)

Select a proper status for Output .

:Output ON ** : : Output OFF

Select a proper status for Alarm .

** :Alarm ON : Alarm OFF

Enter the manual control mode.

Allow to adjust the percentage value of

Cooling output (Alarm) by using or . 000~100%

Reset the maximum and

minimum process values.

Reset the maximum and

minimum process values.

Calibrate the A-D and enter the

cold-junction compensation

Calibrate the 0~20mA and enter it.

Enter the drift compensation code.

Enter the status.

Enter the status.

Hand (manual)

control.

Read peak

process value.

Calibrate

A-D converter*.

Define protection

mode for the

status of control

and alarm

outputs 1 & 2 to

ensure a safe

condition while

the control fails.

Long

Long

Long

Long

Long

Long

Long

Long

Long

3131

or

or

or

or

or

or

Select Lock or Free for the Security Level 0.

: Protect (Lock) all the Level 0 parameters.

** : Allow all the Level 0 parameters to be adjustable.

Select Lock or Free for the Security Level 1.

: Protect (Lock) all the Level 1 parameters.

** : Allow all the Level 1 parameters to be adjustable.

Select Lock or Free for the Security Level 2.

: Protect (Lock) all the Level 2 parameters.

** : Allow all the Level 2 parameters to be adjustable.

Change the value of

security level for the

selected parameter.

Change the value of

security level for the

selected parameter.

Display the rest of

parameters according

to the standard access

sequence.

Change the value of

security level for the

selected parameter.

Enter the updated

security level of ASP1.

Enter the updated

security level of RAMP.

Enter the selection

Enter the selection

Enter the selection

Enter the updated

security level of DB.

Lock

parameters.

Configure

security

levels for all

parameters.

:Security LEVEL

= 0 :Put the parameter

in LEVEL 0.

= 1 :Put the parameter

in LEVEL 1.

= 2 :Put the parameter

in LEVEL 2.

=3 :Mask parameter

Long

Long

Long

Long

Long

Long

* Do not proceed through this section unless there is a definite need to re-calibrate the controller.

All previous calibration data will be lost.

3232

MANUAL CONTROL

The outputs of this controller can be used in a manual mode. This
enables the operator to apply a specific percentage of power to
the system.

To use this unit in manual mode:
Enter the Tool Program Menu by pressing the and the

key simultaneously.
The display will toggle between and .
Press the key momentarily.

The display will toggle between the process variable and the cur­rent output percentage .

To change output #1 skip this step, to change output #2 press the

key momentarily to display the output percentage for the

cooling output .
Press and hold the key for 3.2 seconds.

The display will begin flashing as it toggles between the process
variable and .

Use the and keys to highlight and change the display

to the desired output percentage.

Example:

is viewed with cycle
time =10 sec.
The output 1 will act as shown:

33

PROGRAMMABLE CONTROL ACTION

Output #1 can be used in a reverse action configuration (heating
applications) or in a direct action configuration (cooling applica-

tions) by adjusting parameter .
To adjust the control action of output #1;

Press the key momentarily to enter the Primary Program
Menu.

Press the key momentarily to scroll through the Primary Pro­gram Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and its current setting.

Press and hold either the or key to select the desired
control action ( = direct / = reverse).

33

Reverse Action

PB

100%

Output

0%

Main Setpoint

Note: PB = Proportional Band

PV

100%

Output

Direct Action

PB

0%

Main Setpoint

PV

3434

COOLING CONTROL

This controller has the option of being configured as a single or a
dual output controller.

The alarm output can be used as a control output by setting
parameter in the Primary Program Menu to

.

Once this is done the following parameters are used as output #2
control parameters;

CPB: Cooling Proportional Band
DB: Dead Band
CCYC: Cooling Cycle Time

3535

CONFIGURABLE MENUS

This controller gives you the flexibility to configure the menus in a
way that is most convenient for your application. There are four
menu levels that parameters in the primary program menu can be
assigned to.

-

This is the first group of parameters within the Primary
Program Menu. Locate parameters here that need to
be changed frequently or that need to be accessed
easily.

-

This is the second group of parameters within the Pri­mary Program Menu. Locate parameters here that
need to be accessed but not frequently.

-

This is the third group of parameters within the Prima­ry Program Menu. Locate parameters here that are
specific to your application but are not going to be
changed.

-

This is a level used to mask parameters that are not
used for your application or parameters that are not to
be accessed by the operator.

continued on page 36

3636

TO ASSIGN PARAMETERS TO A SPECIFIC LEVEL

Press the key and the key simultaneously to enter the
Tool Program Menu.

Press the key and the key simultaneously to scroll
through the Tool Program Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and .
Press the key to access the parameters under this, contained

within the primary program menu and their current menu level.
Pause momentarily on a parameter to be changed. After 3.2 sec

the display will begin to toggle between the parameter and the
level it is currently assigned to.

Press and hold either the or key to increment or decre­ment to the menu level desired.

Press and hold the key for 3.2 sec to register the selection.

3737

LOCKING MENUS

The various menu levels within the Primary Program menu can be
left free so that information can be viewed as well as changed, or
any of the levels can be locked so that the information can only be
viewed but not changed.

TO LOCK A MENU LEVEL WITHIN THE PRIMARY PROGRAM MENU

Press the key and the key simultaneously to enter the
Tool Program Menu.

Press the key and the key simultaneously to scroll
through the Tool Program Menu until you come to .

Pause momentarily. After 3.2 sec the display will begin to toggle
between and .

Press the key to access the parameters -

.

Pause momentarily on a menu level to be changed. After 3.2 sec
the display will begin to toggle between the parameter and the
lock setting it is currently set to.

Press and hold either the or key to increment or decre­ment to the lock level desired ( = locked, =
accessible).

Press and hold the key for 3.2 sec to register the selection.

38

ERROR MESSAGES

Symptom Probable Cause(s) Solution
Process display shows: - Sensor break - Replace RTD or sensor

- Use manual mode
operation

Process display shows: - Input signal beyond the - Replace sensor

low range, sensor fails - Check sensor or thermocouple

type, correct input selection

Process display shows: - Input signal beyond the - Replace sensor

high range, sensor fails - Check sensor or thermocouple

type, correct input selection

Process display shows: - A to D module damage - Replace module

- Check for outside source of
damage such as transient
voltage spikes

Process display shows: - Incorrect operation of - Repeat procedure.

auto tune procedure Increase Prop. band to a

- Manual mode is not number larger than 0.
allowed for an ON-OFF
control system

Process display shows: - Check-sum error, values - Check and reconfigure

in memory may have control parameters
changed accidentally.

Process display shows: - Fail to enter data into - Replace EEPROM

EEPROM

Process display shows: - Overflow error, data out - Check if there is noise

of range during coming in.
execution of program - Replace EEPROM.

Process Display shows: - Attempt to change a - UNLOCK procedure stated in

locked parameter the flow chart of tool programs.

38

39

NOTES

39

FOR W

ARRANTY

RETURNS, please have the following

information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was
PURCHASED,

2. Model and serial number of the product under
warranty, and

3. Repair instructions and/or specific problems relative
to the product.

FOR NON-W

ARRANTY

REPAIRS,

consult OMEGA
for current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchse Order number to cover the

COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’ s policy is to make running changes, not model changes, whenever an improvement is possible. This
affords our customers the latest in technology and engineering.

OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 1998 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without
the prior written consent of OMEGA ENGINEERING, INC.

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a peri­od of 37 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period
to the normal three (3) year product warranty 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. OMEGA’s Customer Service Department
will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by
OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does
not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper
interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is
VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a
result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse
or other operating conditions outside of OMEGA’s control. Components which wear are not warranted, including but
not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA
neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will
be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF
TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for consequential,
incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as
set forth in our basic WARRANTY/ DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.

RETURN REQUESTS/ INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR)
NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING
DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

TEMPERATURE

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Where Do I Find Everything I Need for

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OMEGA…Of Course!

M2901/0998