Omega Products CN2504 Installation Manual

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- 1/8 - 1/4 DIN LIMIT CONTROLLERS

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CN2516, CN2508, CN2504

CAUTION: Installation should be only performed by

technically competent personnel. Local Regulations
regarding electrical installation & safety must be observed.

1. INSTALLATION

The models covered by this manual have three different DIN case sizes (refer to
section 9). Some installation details vary between models. These differences have

been clearly shown.

Note: The functions described in sections 2 thru 8 are common to all models.

Installing Option Modules

1

/

Din Size Instrume

16

CPU PCB

Option Module 1

(Fixed Limit Relay)

Option Module 2

1

/8 & 1/4 Din Size

Instruments

CPU PCB

Option Module B

(not used on Limit

Controllers)

Option Module 2

Option Module 1

(Fixed Limit Relay)

To access module A, first detach the PSU and CPU boards from the front by lifting
first the upper, and then lower mounting struts. Gently separate the boards.

a. Plug the required option modules into the correct connectors, as shown below.
b. Locate the module tongues in the corresponding slot on the opposite board.
c. Hold the main boards together while relocating back on the mounting struts.
d. Replace the instrument by aligning the CPU and PSU board
in the housing, then slowly push the instrument back into position.

Note: Option modules are automatically detected at power up.

Option Module Connectors

Option Slot 1

(Fixed Limi

Option Slot 2

Connecto

Option Slot B

(not used o

Limit Controllers

Option Slot 2

Connecto

Option Slot 1

(Fixed Limi

Relay

PL4A

PL4A

Relay

nts

1

/

Din Size Instruments

16

1

/8 & 1/4 Din Size Instruments

Mounting Struts

Option Module A

Option Module 3

PSU PCB

Mounting Struts

Option Module A

Option Module 3

PSU PCB

s with their guides

Option Slot A

Connectors
PL5 & PL6

Option Slot 3

Connector
PL4B

Option Slot A

Connectors
PL5 & PL6

Option Slot 3

Connector
PL4B

Panel-Mounting

The mounting panel must be rigid, and may be up to

6.0mm (0.25inch) thick. Cut-out sizes are:

Cut-Out Dim A Cut-Out Dim B

1

/

& 1/8 Din = 45mm 1/

16

1

/4 Din = 92mm 1/8 & 1/4 Din = 92mm

For n multiple instruments mounted side-by-side, cut-out
A is 48n-4mm (

1

/

& 1/8 Din) or 96n-4mm (1/4 Din)

16

Din = 45mm

16

Mounting Panel

Instrument

Housing

Ratchets

Gasket

CAUTION: Do not remove the panel gasket; it is a seal against dust and

moisture.

Rear Terminal Wiring

USE COPPER CONDUCTORS (EXCEPT FOR T/C INPUT)

Single Strand wire gauge: Max 1.2mm (18SWG)

1

/

Din Size Instruments

16

1

/8 & 1/4 Din Size Instruments

B

A

Tolerance +0.5, -0.0mm

Slide mounting clamp
over the instrument
housing towards rear face
of mounting panel until
the tongues engage in
ratchets and instrument is
clamped in position.

Hold instrument firmly in
position (apply pressure
to bezel only)

2. SELECT MODE

Select mode is used to access the configuration and operation menu functions.
It can be accessed at any time by holding down and pressing .
In select mode, press or to choose the required mode, press to enter.
An unlock code is required to prevent unauthorised entry to Configuration, & Setup
modes. Press or to enter the unlock code, then press to proceed.

Mode Upper

Display

Lower

Display

Description Default

Unlock

Codes

Operator Normal operation None

Set Up Tailor settings to the application

Configuration Configure the instrument for use

Product Info Check manufacturing information None

Note: The instrument will always return automatically to Operator mode if
there is no key activity for 2 minutes.

3. CONFIGURATION MODE

First select Configuration mode from Select mode (refer to section 2).
Press to scroll through the parameters, then press or to set the required
value. Press to accept the change, otherwise parameter will revert to previous
value. To exit from Configuration mode, hold down and press , to return to
Select mode.

Note: Parameters displayed depends on how instrument has been configured.
Refer to user guide (available from your supplier) for further details.
Parameters marked * are repeated in Setup Mode.

Parameter Lower

Input
Range/Type

Code Input Type &

Range

B: 100 - 1824 ºC L: 0.0 - 537.7 ºC

B: 211 - 3315 ºF L: 32.0 - 999.9 ºF

C: 0 - 2320 ºC N: 0 - 1399 ºC Pt100: –199 - 800 ºC

C: 32 - 4208 ºF N: 32 - 2551 ºF Pt100: –328 - 1472 ºF

J: –200 - 1200 ºC R: 0 - 1759 ºC Pt100: –128.8 - 537.7 ºC

J: –328 - 2192 ºF R: 32 - 3198 ºF Pt 100: –199.9 - 999.9 ºF

J: –128.8 - 537.7 ºC S: 0 - 1762 ºC 0 - 20 mA DC

J: –199.9 - 999.9 ºF S: 32 - 3204 ºF 4 - 20 mA DC

K: –240 - 1373 ºC T: –240 - 400 ºC 0 - 50 mV DC

K: –400 - 2503 ºF T: –400 - 752 ºF

K: –128.8 - 537.7 ºC T: –128.8 - 400.0 ºC 0 - 5 V DC

K: –199.9 - 999.9 ºF T: –199.9 - 752.0 ºF 1 - 5 V DC

L: 0 - 762 ºC 0 - 10 V DC

L: 32 - 1403 ºF

Note: Decimal point shown in table indicates temperature resolution of 0.1°
Parameter Lower

Scale Range
Upper Limit
Scale Range
Lower Limit

Decimal point
position

Process Variable
Offset

Upper

Display

Display

Code Input Type &

Upper

Display

Display

Adjustment range & Description Default

See following table for possible codes

Code Input Type &

Range

PtRh20% vs. 40%:
0 - 1850 ºC

Range

PtRh20% vs 40%:
32 - 3362 ºF

10 - 50 mV DC

.

2 - 10 V DC

Adjustment range & Description Default

Scale Range Lower Limit +100

to Range Maximum

Range Minimum to

Scale Range Upper Limit -100

=XXXX, =XXX.X, =XX.XX, =X.XXX

(non-temperature ranges only)

±

Span of controller

(see CAUTION note at end of section)

Value

Value

Range max

(Lin=1000)
Range min

(Linear=0)

High Limit.

Limit relay is energised when

Limit Action

process “safe” (PV < Limit Setpoint)

Low Limit.

Limit relay is energised when

process “safe” (PV > Limit Setpoint)

Setpoint Upper
Limit
Setpoint Lower
Limit

Current Setpoint to Scale Range maximum R/max

Scale Range minimum to Current Setpoint R/min

Process High Alarm

Process Low Alarm

Alarm 1Type

Deviation Alarm

Band Alarm

No alarm

Range Max

Range Min

These diagrams show all possible option combinations. The actual

connections required depends on the exact model and options fitted.

CAUTION: Check information label on housing for correct operating

voltage before connecting supply to Power Input
Fuse: 100 – 240V ac – 1amp anti-surge
24/48V ac/dc – 315mA anti-surge

Note: At first power-up the message

is displayed, as described in
section 6 of this manual. Access to other menus is denied until configuration
mode is completed

High Alarm 1
value*
Low Alarm 1
value*
Band Alarm 1
value*
Dev. Alarm 1
value*
Alarm 1
Hysteresis*

Scaled Range Minimum to

scaled Range Maximum in display units

1 LSD to span from setpoint in display units

+/- Span from setpoint in display units

1 LSD to full span in display units

Parameter Lower

Display

Alarm 2 Type*
High Alarm 2

value*
Low Alarm 2
value*
Band Alarm 2
value*
Dev. Alarm 2
Value*
Alarm 2
Hysteresis*

Output 2 Usage

Linear Output 2
Range

Retransmit
Output 2 Scale
maximum
Retransmit
Output 3 Scale
minimum

Output 3 Usage As for output 2
Linear Output 3

Range
Retransmit
Output 3 Scale
maximum
Retransmit
Output 3 Scale
minimum

Display Strategy

Serial
Communications
Protocol

Serial
Communications
Bit Rate

Comms Address

Comms Write

Configuration
Lock Code

Notes: Output 1 is always a Latching Limit Relay output.
If Option Slot A has the Digital Input module fitted, this always functions as a
Remote Reset, duplicating the function of the Reset) key .

As these functions cannot be changed, no Configuration menus are required.

CAUTION: Process Variable Offset can be used to modify the

measured value to compensate for probe errors. Positive values
increase the reading, negative values are subtracted. This parameter
is effectively, a calibration adjustment and MUST be used with care.

There is no front panel indication of when this parameter is in use.

Upper

Adjustment range & Description Default

Display

Options as for alarm 1

Limit Output Relay

Alarm 1, Direct

Alarm 1, Reverse

Alarm 2, Direct

Alarm 2, Reverse

Logical Alarm 1 OR 2, Direct

Logical Alarm 1 OR 2, Reverse

Logical Alarm 1 AND 2, Direct

Logical Alarm 1 AND 2, Reverse

Limit Annunciator, Direct
Limit Annunciator, Reverse
Retransmit Limit SP Output

Retransmit PV Output

0 to 5 V DC output 1

0 to 10 V DC output

2 to 10 V DC output
0 to 20 mA DC output
4 to 20 mA DC output

-1999 to 9999

(display value at which output

will be maximum)

-1999 to 9999

(display value at which output

will be minimum)

As for output 2

-1999 to 9999

(display value at which output

will be maximum)

-1999 to 9999

(display value at which output

will be minimum)

PV is visible in Operator mode

PV not visible in Operator mode

Displays in Operator mode

when Limit Output is not active

ASCII

Modbus with no parity

Modbus with Even Parity

Modbus with Odd Parity

.

.

.

.

.

1.2 kbps

2.4 kbps

4.8 kbps

9.6 kbps

19.2 kbps

1 to 255 (Modbus), 1 to 99 (ASCII)

Read/Write

Read only

0 to 9999

Value

Range Max

Range Min

Range max

Range min

Range max

Range min

.

4. SETUP MODE

Note: Configuration must be completed before adjusting Setup parameters.

First select Setup mode from Select mode (refer to section 2). The Setup LED
will light while in Setup mode. Press to scroll through the parameters,
then press or to set the required value.
To exit from Setup mode, hold down and press to return to Select mode.

Note: Parameters displayed depends on how instrument has been configured.

Parameter Lower

Display

Upper Display Adjustment

Range & Description

Default

Value

R/max if

Limit Setpoint value

Scaled Range Minimum to

scaled Range Maximum

=

R/min if

=

Limit Hysteresis

Input Filter Time Constant

High Alarm 1 value R/max

Low Alarm 1 value

Deviation Alarm 1 Value

1 LSD to full span in display units,

on the safe side of the limit SP

OFF or 0.5 to 100.0 secs

(see CAUTION note below)

Scaled Range Minimum to

scaled Range Maximum

±Span from SP in display units

.

R/min

Band Alarm 1 value 1 LSD to span from setpoint

Alarm 1 Hysteresis 1 LSD to full span in display units

High Alarm 2 value R/max

Low Alarm 2 value

Deviation Alarm 2 Value

Scaled Range Minimum to

scaled Range Maximum

±Span from SP in display units

R/min

Band Alarm 2 value 1 LSD to span from setpoint

Alarm 2 Hysteresis 1 LSD to full span in display units

Setup Lock Code 0 to 9999

Note: Operator mode screens follow, without exiting from Setup mode.

CAUTION: An excessively large filter time could significantly delay

detection of a limit condition. Set this value to the minimum required
to remove noise from the process variable

5. PRODUCT INFORMATION MODE

First select Product information mode from Select mode (refer to section 2).
Press to view each parameter. To exit from Product Information mode,
hold down and press to return to Select mode.
Note: These parameters are all read only.

Parameter Lower

Display

Input type Universal input

Option 1 type (fixed) Latching Limit Relay

Option 2 module type
fitted

Option 3 module type
fitted

Auxiliary Option A
module type fitted

Firmware type Value displayed is firmware type number

Firmware issue Value displayed is firmware issue number

Product Revision Level Value displayed is Product Revision level

Date of manufacture

Serial number 1 First four digits of serial number

Serial number 2 Middle four digits of serial number

Serial number 3 Last four digits of serial number

Mm

Mm

MmMm

Upper

Display

Description

No option fitted

Relay output

SSR drive output

Triac output

Linear DC voltage / current output

No option fitted

Relay output

SSR drive output

Linear DC voltage / current output

Transmitter power supply

No option fitted

RS485 communications

Digital Input for remote reset

Manufacturing date code (mmyy)

6. ERROR/FAULT INDICATIONS

Parameter Upper

Display

Lower

Display

Description

Configuration & Setup required. This screen is

Instrument
parameters are in
default conditions

configuration has been changed. Press to

seen at first turn on, or if hardware

enter the Configuration Mode, next press

or to enter the unlock code number,

then press to proceed

Input Over Range

Input Under
Range

Input Sensor
Break

Option 1 Error

Option 2 Error

Option 3 Error

Option A Error

Option B Error

Normal

Normal

Normal

Normal

Normal

Normal

Process variable input > 5% over-range

as above if Display Strategy =

Process variable input > 5% under-range

as above if Display Strategy =

Break detected in process variable input

as above if Display Strategy =

Option 1 module fault

Option 2 module fault

Option 3 module fault

Option A module fault

Option B not used on Limit Controllers

this error is shown if any module is fitted

sensor or wiring

7. OPERATOR MODE

This mode is entered at power on, or accessed from Select mode (see section 2).

Note: All Configuration mode and Setup mode parameters must be set as
required before starting normal operations.
Press to scroll through the parameters.

Upper
Display

PV Value

Limit SP
Value

or

Lower

Display Strategy and

Display

Limit SP

Value

(Blank)

(Blank)

or PV
Value

When Visible

=

(initial screen)

=

(initial screen)

= .

(Initial Screen)

Description

PV and Limit Setpoint values

Read only

Limit Setpoint value

Read only

Displays and PV if Limit

Output is active or and blank

if not active.

Read only

Highest PV value since this
High Limit
Hold

=

parameter was last reset.

To reset, press for 5 seconds,

display =

when reset

Lowest PV value since this
Low Limit
Hold

Exceed Time
Value

Active Alarm
Status

=

Always available

Format mm.ss to 99.59

then mmm.s

(10 sec increments)

Shows

if 999.9

When one or more
alarms are active.

ALM indicator
will also flash

parameter was last reset.

To reset, press for 5 seconds,

display =

when reset

Accumulated time of Limit SP

exceed conditions since this

parameter was last reset.

To reset, press for 5 seconds,

display =

L

when reset

Alarm 2 active

Alarm 1 active

L

Annunciator active

Exceed Condition

An Exceed Condition is when the Process Variable exceeds the Limit Setpoint value
(i.e. PV > SP when set for high limit action, PV < SP for low limit action). The
LED is on during this condition, and is extinguished once it has passed.

Limit Output Function

Limit Output relay(s) de-energise whenever an Exceed condition occurs, causing
the process to shut down. The LED is on when the relay is de-energised.
The relay remains latched off even if the Exceed condition is no longer present.
Only giving a reset instruction (after
energise the relay, allowi ng the process to continue. The LED then turns off.

Limit Annunciator Outputs

An Annunciator output will activate when an Exceed condition occurs, and will
remain active until a reset instruction is received, or the Exceed condition has
passed. Unlike the Limit Output, an Annunciator can be reset even if the Exceed
condition is present. When an Annunciator is active, the LED will flash and the
Alarm Status screen is available.

Resetting Limit Outputs & Annunciators

A reset instruction can be given by pressing the key, via the Digital Input (if
fitted) or via a Comms command if an RS485 Communications module is fitted.
Annunciators will deactivate. Limit Outputs will only re-energise if the Exceed
condition has passed.

CAUTION: Ensure that the cause of the Exceed condition has been

rectified before resetting the Limit Output.

the exceed condition has passed) will re-

8. SERIAL COMMUNICATIONS

Refer to the full user guide (available from your supplier) for details.

9. SPECIFICATIONS

UNIVERSAL INPUT

Thermocouple
Calibration:

PT100 Calibration:

DC Calibration:

Sampling Rate: 4 per second.

Impedance:

Sensor Break
Detection:

Isolation: Isolated from all outputs (except SSR driver).

Universal input must not be connected to operator accessible

DIGITAL INPUT

Volt-free(or TTL): Open(2 to 24VDC) =No Reset.

Isolation: Reinforced safety isolation from inputs and other outputs.

OUTPUTS

Limit Relay

Contact Type &
Rating:

Lifetime: >100,000 operations at rated voltage/current.

Isolation: Basic Isolation from universal input and SSR outputs.

Alarm Relays

Contact Type &
Rating:

Lifetime: >500,000 operations at rated voltage/current.

Isolation: Basic Isolation from universal input and SSR outputs.

SSR Driver

Drive Capability:

Isolation: Not isolated from universal input or other SSR driver outputs.

Triac

Operating Voltage:

Current Rating: 0.01 to 1A (full cycle rms on-state @ 25°C );

Isolation: Reinforced safety isolation from inputs and other outputs.

DC

Resolution: 8 bits in 250mS (10 bits in 1s typical, >10 bits in >1s typical).

Isolation: Reinforced safety isolation from inputs and other outputs.

Transmitter PSU

Power Rating:

Isolation: Reinforced safety isolation from inputs and other outputs.

SERIAL COMMUNICATIONS

Physical: RS485, at 1200, 2400, 4800, 9600 or 19200 bps.

Protocols: Selectable between Modbus and West ASCII.

Isolation: Reinforced safety isolation from all inputs and outputs.

OPERATING CONDITIONS (FOR INDOOR USE)

Ambient
Temperature:

Relative Humidity: 20% to 95% non-condensing.

Supply Voltage and
Power:

ENVIRONMENTAL

Standards: CE, UL, ULC & FM 3545, 1998

EMI: Complies with EN61326 (Susceptibility & Emissions).

Safety
Considerations:

Front Panel Sealing: To IP66 (IP20 behind the panel).

PHYSICAL

Front Bezel Size: 1/

Depth Behind Panel:

Weight: 0.21kg maximum.

±0.1% of full range, ±1LSD (±1°C for Thermocouple CJC).
BS4937, NBS125 & IEC584.

±0.1% of full range, ±1LSD.
BS1904 & DIN43760 (0.00385

Ω/Ω

/°C).

±0.1% of full range, ±1LSD.

>10MΩ resistive, except DC mA (5Ω) and V (47kΩ ).
Thermocouple, RTD, 4 to 20 mA, 2 to 10V and 1 to 5V ranges

only. Limi t outputs turn off (goes into Exceed condition), high

alarms activate for thermocouple/RTD sensor break, low
alarms activate for mA /V DC sensor break.

circuits if relay outputs are connected to a hazardous voltage
source. Supplementary insulation or input grounding would
then be required.

Closed(<0.8VDC) = Reset (edge triggered).

Latching limit control relay. Single pole double throw (SPDT);
5A resistive at 120/240VAC. Slot 1 position fixed for this
function, optional function for Slot 2 & 3 relay modules,

Slot 2 or 3 position non-latching alarm relay.
Single pole double throw (SPDT); 2A resistive at 120/240VAC

SSR drive voltage >10V into 500Ω min.

20 to 280Vrms (47 to 63Hz).

derates linearly above 40°C to 0.5A @ 80°C.

20 to 28V DC (24V nominal) into 910Ω minimum resistance.

0°C to 55°C (Operating), –20°C to 80°C (Storage).

100 to 240VAC ±10%, 50/60Hz, 7.5VA
(for mains powered versions), or
20 to 48VAC 50/60Hz 7.5VA or 22 to 65VDC 5W
(for low voltage versions).

Complies with EN61010-1 & UL3121.
Pollution Degree 2, Installation Category II.

Din = 48 x 48mm, 1/8 Din = 96 x 48mm,

16

1

/4 Din = 96 x 96mm.

1

/

Din = 110mm, , 1/8 & 1/4 Din = 100mm.

16

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The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it
contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period
of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to
the normal one (1) 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
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Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

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Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
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The assigned AR number should then be marked on the outside of the r eturn package and on any
correspondence.

The purchaser is responsible for s hipping charges, freight, insurance and proper packaging to prevent
breakage in transit.

FOR WARRANTY 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.

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.

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TEMPERATURE



Thermocouple, RTD & Thermistor Probes, Connectors,
Panels & Assemblies



Wire: Thermocouple, RTD & Thermistor



Calibrators & Ice Point References



Recorders, Controllers & Process Monitors



Infrared Pyrometers

PRESSURE, STRAIN AND FORCE



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

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

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FLOW/LEVEL

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

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

Turbine/Paddlewheel Systems

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Totalizers & Batch Controllers

sm

pH/CONDUCTIVITY



pH Electrodes, Testers & Accessories

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Controllers, Calibrators, Simulators & Pumps

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Industrial pH & Conductivity Equipment

WARRANTY/ DISCLAIMER

RETURN REQUESTS / INQUIRIES

FOR NON-WARRANTY REPAIRS,
current repair charges. Have the following
information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems

DATA ACQUISITION

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HEATERS

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ENVIRONMENTAL
MONITORING AND CONTROL

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Mexico/Latin Ameica:

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En Español: 001 [phone]

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FAX: [phone]

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[e-mail]
e-mail: [e-mail]

United Kingdom:

ISO 9001 Certified

OMEGA Engineering Ltd.
One Omega Drive
River Bend Technology Centre
Northbank
Irlam, Manchester M44 5BD
United Kingdom
Toll-Free: 0800-488-488
TEL: [phone]
FAX: [phone]
e-mail: [e-mail]

consult OMEGA for

repair,

relative to the product.

Data Acquisition & Engineering Software
Communications-Based Acquisition Systems
Plug-in Cards for Apple, IBM & Compatibles
Data Logging Systems
Recorders, Printers & Plotters

Heating Cable
Cartridge & Strip Heaters
Immersion & Band Heaters
Flexible Heaters
Laboratory Heaters

Metering & Control Instrumentation
Refractometers
Pumps & Tubing
Air, Soil & Water Monitors
Industrial Water & Wastewater Treatment
pH, Conductivity & Dissolved Oxygen Instruments

M5123/0812