Omega Products CN2408 Installation Manual

Installation and Operation Handbook Safety Information

MODELS CN2408 AND CN2404 PID

CONTROLLERS

INSTALLATION AND OPERATION HANDBOOK

Contents Page

Chapter 1 INSTALLATION .......................................................... 1-1

Chapter 2 OPERATION ............................................................... 2-1

Chapter 3 ACCESS LEVELS....................................................... 3-1

Chapter 4 TUNING....................................................................... 4-1

Chapter 5 PROGRAMMER OPERATION ................................... 5-1

Chapter 6 CONFIGURATION...................................................... 6-1

Chapter 7 USER CALIBRATION................................................. 7-1

Appendix A UNDERSTANDING THE ORDERING CODE.............A-1

SAFETY and EMC INFORMATION......................................................B-1

CN2404 and CN2408 controller software version 3.0 1

Installation and Operation Handbook Installation

Chapter 1 INSTALLATION

Display screen

Latching ears

Sleeve

Ratchets

Panel retaining clips

Panel sealing gasket

Figure 1-1 CN2408 1/8 DIN controller

Sleeve

Ratchets

Terminal covers

Label

Terminal covers

Display screen

Label

Panel retaining clips

Latching ears

Figure 1-2 CN2404 1/4 DIN controller

CN2408 and CN2404 Controller 1-1

Panel sealing gasket

Installation Installation and Operation Handbook

(1.5in)

Outline dimensions Model CN2408

48mm

1.89in

96mm

3.78in

Panel

cut-out

92 x 45mm

-0

+0.8-0+0.6

3.62x1.77in

-0

+0.03-0+0.02

Figure 1-3 Outline dimensions Model CN2408 controller

Outline dimensions Model CN2404

96mm

3.78in

150mm

5.91in

Recommended
minimum spacing
of controllers

10mm
(0.4in)

150mm

5.91in

38mm
(1.5in)

(Not to

scale)

96mm

3.78in

Panel cut-out

92 x 92 mm

3.62 x 3.62 in

+0.8

+0.03

-0

-0

Recommended
minimum
spacing of
controllers

10mm

(0.4in)

Figure 1-4 Outline dimensions Model CN2404 controller

The electronic assembly of the controller plugs into a rigid plastic sleeve, which in turn
fits into the standard DIN size panel cut-out shown in Figures 1-3 and 1-4.

1-2 CN2408 and CN2404 Controller

38mm

(Not to
scale)

Installation and Operation Handbook Installation

INTRODUCTION

Models CN2408 and CN2404 are high stability, temperature or process controllers with
self and adaptive tuning. They have a modular hardware construction which accepts up
to three plug-in Input/Output modules and two interface modules to satisfy a wide range
of control requirements. Two digital inputs and an optional alarm relay are included as
part of the fixed hardware build. In addition, the Model CN2404 has an optional plug-in
10A heating output.

The instruments are available as:
standard controllers which include a basic 8-segment programmer

Models CN2408-CG and CN2404-CG

setpoint programming controllers: Models CN2408-CP, P4, CM and CN2404-CP,

P4, CM

motorized valve controllers which include a basic 8-segment programmer

Models CN2408-VC and CN2404-VC
setpoint programming
motorized valve controllers: Models CN2408-VP, V4, VM and CN2404-VP,

V4, VM

Before proceeding, please read the chapter called, Safety and EMC Information.

Controller labels

The labels on the sides of the controller identify the ordering code, the serial number, and
the wiring connections.

Appendix A, Understanding the Ordering Code, explains the hardware and software
configuration of your particular controller.

MECHANICAL INSTALLATION

To install the controller

1. Prepare the control panel cut-out to the size shown in Figure 1-3, or 1-4.

2. Insert the controller through the panel cut-out.

3. Spring the upper and lower panel retaining clips into place. Secure the controller in

position by holding it level and pushing both retaining clips forward.

Note: If the panel retaining clips subsequently need removing, in order to extract the
controller from the control panel, they can be unhooked from the side with either your
fingers, or a screwdriver.

Unplugging and plugging-in the controller

If required, the controller can be unplugged from its sleeve by easing the latching ears
outwards and pulling it forward out of the sleeve. When plugging the controller back into
its sleeve, ensure that the latching ears click into place in order to secure the IP65 sealing.

CN2408 and CN2404 Controller 1-3

Installation Installation and Operation Handbook

NLV+

VI

V-

Line

Ground*

2D

2B

2A2C3D

3B3A3C

1D

1B

1A

1C

M

M

3

M

2

JF

JD

JE

C

2

LCLALB

AC

AA

AB

HFHDHE

C

1

HBHAHC

20 − 29Vac/dc

*

N

++

−−

JBJAJC

+

−

+

RTD/Pt100

T/C

ELECTRICAL INSTALLATION

This section consists of five topics:

• Rear terminal layouts

• Fixed connections

• Plug-in module connections

• Typical wiring diagrams

• Motorized valve connections.

You must ensure that the controller is correctly configured for your application. Incorrect configuration

WARNING

could result in damage to the process being controlled, and/or personal injury. It is your responsibility,
as the installer, to ensure that the configuration is correct. The controller may either have been
configured when ordered, or may need configuring now. See Chapter 6, Configuration.

Model CN2408 rear terminal layout

Low voltage supply

24

O
D
U

L

E

1

O
M
M
S

O
D
U

L

85 to 264Vac

Neutral

Input 1

Input 2

Common

Note: The plug-in sleeve
supplied with high voltage
controllers are keyed to
prevent a low voltage unit
being inserted into them.

E

Alarm
relay

O

D
U
L
E

O
M
M

S

PV

−

Neutral
Ground

Figure 1-5 Rear terminal layout −− Model CN2408

* The ground connection is provided as a return for internal EMC filters. It is not
required for safety purposes, but must be connected in order to satisfy EMC
requirements.

1-4 CN2408 and CN2404 Controller

Installation and Operation Handbook Installation

Ground*

−

+

Line

B

R

B

R

Load

All electrical connections are made to the screw terminals at the rear of the controller. These
screw terminals accept wire sizes from 0.5 to 2.5mm2 (14 to 22 awg) and should be
tightened to a torque of 0.4 Nm (3.5 lb. in). Crimp connectors that accept wire sizes from

0.5 to 1.5 mm2 (16 to 22 AWG) can be used. The terminals are protected by a clear plastic
hinged cover to prevent hands, or metal, making accidental contact with live wires.

Rear terminal layouts

The rear terminal layouts are shown in Figures 1-5 and 1-6. The right-hand column
carries the connections to the power supply, digital inputs 1 and 2, alarm relay and sensor
input. The second and third columns from the right carry the connections to the plug-in
modules. The connections depend upon the type of module installed, if any. To
determine which plug-in modules are fitted, refer to the ordering code and wiring data on
the controller side labels. The Model CN2404 has the option of 10Amp heating output in
the left-hand column.

Model CN2404 rear terminal layout

Low voltage supply

+

20 – 29Vac/dc

24

-

N

Neutral

1A

4A

H

4B

I

G

4C

U
S
B
A

H

4D

C

5A

U
R

5B

R
E
N

5C

T

5D

O

6A

U

U
S
B
A

T

6B

P
U

6C

T

6D

M
O

1B

D
U

1C

L

E

1D

1

2A

M
O

2B

D
U

L

2C

E

2

2D

M

3A

O
D

3B

U

L

3C

E

3

3D

HA

HB

C
O

HC

M
M

HD

S
1

HE

HF

JA

JB

C
O

JC

M
M

JD

S
2

JE

L

Line

85 to 264Vac

N

Neutral

LA

Input 1

Input 2

LB

Common

LC

AA

Alarm

AB

relay

AC

RTD/Pt100

VI

T/C

V+

+

V-

JF

PV

−

Figure 1-6 Rear terminal layout −− Model CN2404

* The ground connection is provided as a return for internal EMC filters. It is not required

for safety purposes, but must be connected in order to satisfy EMC requirements

CN2408 and CN2404 Controller 1-5

Installation Installation and Operation Handbook

+

-

Sensor input connections

The connections for the various types of sensor input are shown below.

Thermocouple

VI

V+

V-

Resistance
thermometer

VI

V+

V-

Fig 1-7 Sensor input connections

mA input

VI

V+

V-

2.49Ω
current
sense
resistor

Volts or mV
inputs

VI

V+

PV

V-

PLUG-IN MODULE CONNECTIONS

Module 1, 2 and 3

Module positions 1, 2 and 3 are plug-in modules. They can be either two terminal
modules of the types shown in Table 1-1, or four terminal modules of the types shown
in Table 1-2.

The tables show the connections to each module and the functions that they can perform.
Module 1 is normally used for heating and module 2 for cooling, although the actual
functions will depend upon how the controller has been configured.

PDLINK modes

Table 1-8 refers to PDLINK modes 1 and 2.
PDLINK stands for ‘Pulse Density Signaling Input/Output’. This is a for bi-directional

transmission of analog and digital data over a simple 2-wire connection.
PDLINK 1 mode uses a dc pulse module to control an Omega SSC-TE10S solid state

relay and provides a load failure alarm.
PDLINK 2 mode uses a dc pulse module to control an Omega SSC-TE10S solid state

relay, provide load/SSR failure alarms, and read back the load current for display on the
controller.

1-6 CN2408 and CN2404 Controller

Installation and Operation Handbook Installation

Two terminal modules

Table 1-1 Two terminal module connections

Note: Module 1 is connected to terminals 1A and 1B

Module 2 is connected to terminals 2A and 2B
Module 3 is connected to terminals 3A and 3B.

Terminal identity

Module type A B C D Possible functions

Relay: 2-pin

(2A, 264 Vac max.)

dc pulse

non-isolated

(18Vdc at 20mA)

AC SSR

(1A, 30 to 264Vac)

DC output:

non-isolated

(10Vdc, 20mA max.)

++ −−

Line Load

++ −

Unused Heating, cooling, alarm,

program event, valve raise,

or valve lower

Unused Heating, cooling, PDLINK

mode 1, PDLINK mode 2,

program event

Unused Heating, cooling, program

event, valve raise, or valve

lower

Unused Heating, or cooling, or

retransmission of PV,

setpoint, or control output

Snubbers

The relay and AC SSR modules have an internal 15nF/100Ω ‘snubber’ connected across
their output, which is used to prolong contact life and to suppress interference when
switching inductive loads, such as mechanical contactors and solenoid valves.

WARNING

When the relay contact is open, or the AC SSR is off, the snubber circuit passes 0.6mA at
110Vac and 1.2mA at 240Vac. You must ensure that this current, passing through the
snubber, will not hold on low power electrical loads. It is your responsibility as the installer
to ensure that this does not happen. If the snubber circuit is not required, it can be removed
from the relay module (BUT NOT THE AC SSR) by breaking the PCB track that runs
crosswise, adjacent to the edge connectors of the module. This can be done by inserting the
blade of a small screwdriver into one of the two slots that bound it and twisting.

CN2408 and CN2404 Controller 1-7

Installation Installation and Operation Handbook

Four terminal modules

Table 1-2 Four terminal module connections

Note: Module 1 is connected to terminals 1A, 1B, 1C and 1D

Module 2 is connected to terminals 2A, 2B, 2C and 2D
Module 3 is connected to terminals 3A, 3B, 3C and 3D

Module type Terminal identity Possible

A B C D

Relay: changeover

(2A, 264 Vac max.)

DC control: Isolated

(10V, 20mA max.)

24Vdc transmitter

supply

Potentiometer input

100Ω to 15KΩ

DC retransmission

DC remote input or

Process Value 2

(Module 3 only)

Dual output modules

Dual relay

(2A, 264 Vac max.)

Dual AC SSR

(1A, 30 to 264Vac)

Dual dc pulse + relay

(dc pulse is non-

isolated)

N/O

+ −−

+ −

+0.5Vdc

+ −

0-10Vdc RT source

Line

+ −

Load

N/C

±100mV

0-20mA

(Refer to Fig. 1-8)

Line

0V

COM

Load

Heating, cooling,

alarm, or program

Heating, or cooling

To power process

Motorized Valve

Position feedback

process value

Remote Setpoint

Heating + cooling

Valve raise & lower

Heating + cooling

Valve raise & lower

Heating + cooling

functions

event output

inputs

Retrans. of

setpoint, or

Second PV

Dual alarms

Dual dc pulse + AC SSR

(dc pulse is non-

isolated)

Triple logic input and output modules - see ratings on the next page

Triple contact input Input 1 Input 2 Input 3 Common

Triple logic input Input 1 Input 2 Input 3 Common

Triple dc pulse output Output 1 Output 2 Output 3 Common Program events

+ −

Line

Load

Heating + cooling

1-8 CN2408 and CN2404 Controller

Installation and Operation Handbook Installation

0-1.6Vdc

3D

3D

3D

3D

3D

Connections for Process Value 2 in module position 3

The diagrams below show the connections for the various types of input.
The input will have been configured in accordance with the ordering code.

Thermocouple

3A

3B

+

3C

−

Resistance

thermometer

3A

3B

3C

Figure 1-8 Connections for Process Value 2 (PV2)

mA input

3A

Current
resistor

3B

2.49Ω

+

3C

−

sense

Volts or

mV inputs

3A

3B

+

3C

High Impedance

or mVdc

−

Triple Logic Input and Triple DC Pulse output ratings

1. Triple logic input (current sinking)

OFF state: −3 to 5Vdc
ON state: 10.8 to 30Vdc(max), at 2 to 8mA

2. Triple contact closure or open collector transistor input

Internally generated switching Vdc & mA: 15 to 19Vdc at 10 to 14mA
OFF state >28KΩ input resistance
OFF state voltage >14Vdc
ON state <100Ω resistance
ON state voltage <1.0Vdc

3. Triple dc pulse output (current sourcing)

OFF state output 0 to 0.7Vdc.
ON state output 12 to 13Vdc, at up to 8mA.

10V inputs

+

3A

3B

0-10Vdc

3C

−

CN2408 and CN2404 Controller 1-9

Installation Installation and Operation Handbook

Communication modules 1

The Models CN2408 and CN2404 will accept two plug-in communications modules.
The possible module types are shown in the table below.

Only one of the two modules can be for serial communications and this will normally be
installed in position COMMS 1, as shown below. However, it is possible to install the
serial communications module in position COMMS 2.
The serial communications can be configured for Modbus® protocol.

Table 1-3 Communication modules 1 and 2 connections

Communications
module 1

Module type HA HB HC HD HE HF
2-wire RS-485 (EIA-485)

serial communications
RS-232 (EIA-232) serial

communications
4-wire RS-485 (EIA-485)

serial communications

− − −

− − −

− A′

Terminal identity (COMMS 1)

Common A (+)

Common Rx Tx

B′

(Rx+)

(Rx−)

Common

A

(Tx+)

B (−)

B

(Tx−)

1-10 CN2408 and CN2404 Controller

Installation and Operation Handbook Installation

E

F

Wiring of 2-wire RS-485 (EIA-485) serial communications link

Com

Local
ground

232

Local
ground

Com

Universal Communications

Com B

Local
ground

Local
Ground
Zone 1

Local
ground

Local
Ground
Zone 1

Local
ground

Local
Ground
Zone 1

Local
ground

Area 1

PC

Interface

RXTX

TXRX

A

A
B

Com

A
B

Com

Up to 32 controllers or
Interface Units may
be included on the network

A
B

Com

2-wire RS-485 (EIA-485) is a connection, which allows
up to 32 controllers to be multi-dropped from a single
communications link over a distance of up to 1.2Km. To
ensure reliable operation of the communications link,
(without data corruption due to noise or line reflections)
the connections between the controller should be made
using a twisted pair of wires inside a screened cable with
the connections terminated with resistors in the manner
shown in this diagram. This diagram also shows the use
of a universal converter to connect the RS-485 (EIA-485)
link into a standard RS-232 (EIA-232) computer port.

HE
HF

HD

Galvanic

Isolation

Barrier

HE
HF

HD

D

Series CN2408/CN2404
Controller

Local
Ground
Zone 1

A
B
Com

For reasons of safety
do not connect to
local ground here.

Series CN2408/CN2404
Controller

Local
Ground
Zone 2

Local Ground

Series CN2408/CN2404
Controller

A

HE

B

HF

Com

HD

Note:

All resistors are 220 ohm 1/4W carbon composition.
Local grounds are at equipotential. Where equipotential is not available wire into
separate zones using a galvanic isolator.
Use a repeater for more than 32 units.

Figure 1-9 RS-485 (EIA-485) wiring

CN2408 and CN2404 Controller 1-11

Installation Installation and Operation Handbook

N

V+

V-

2D

2B

2C

3B

1D

1B

1C

M

3

HF

C

1

JD

JE

LC

LA

AC

AA

AB

T/C

Line

Neutral

SSC-TE10S

+

−

C

2

HBHAHC

TYPICAL WIRING DIAGRAM

Cooling

Power Fuse

1A(T)

Controller

Fuse 2A(T)

dc pulse

1A

L

heating
output

HD

O

2A

AC SSR
cooling
output

M

HE

M

LB

S

+

+

3A

O
D

O

U

M

L

3C

3D

M

E

S

JF

VI

-

Heating power fuse

(load dependent)

PV

-

Solid State

Relay

Cooling

Heater

Solenoid

Fig 1-10 Typical wiring diagram, Model CN2408 Controller

1-12 CN2408 and CN2404 Controller

Installation and Operation Handbook Installation

N

Neutral

Ground

++

−−

−−

2B

2A2C3D

3B

1D

1B

1A

1C

M

HF

HD

HE

C

1

C

2

LC

LA

AC

AA

AB

HBHAHC

++

−−

MOTORIZED VALVE CONNECTIONS

Motorized valves will normally be wired either to dual relay, or dual AC SSR, output
modules installed in the Module 1 position, or to single channel relay and AC SSR
outputs installed in Module positions 1 and 2. In the latter case, the convention is to
configure output 1 as the raise output and output 2 as the lower output.
Depending on the configuration, control of the valve is achieved in one of three ways:

1. With no position feedback potentiometer.

2. With a feedback potentiometer used to monitor the valve’s position. It does not

influence the control.

3. With a feedback potentiometer, where the valve’s position is controlled in response

to the signal from it.

Motor supply

R
A

Motorized

I

valve

S
E

L

O

W

E
R

Motor

2D

3A

3C

Feedback

Potentiometer

(Optional)

Fig 1-11 Motorized valve connections

Dual

relay/

AC SSR/

output

module

O
D
U

L

E

2

Pot

Input

Module

L

Line

85 to 264Vac

Input 1

O
M
M
S

LB

Input 2

Common

Alarm
relay

JD

O
M

JE

M

S

JF

VI

V+

RTD/Pt100

++

PV

V-

CN2408 and CN2404 Controller 1-13

Operation Installation and Operation Handbook

Chapter 2 OPERATION

This chapter has nine topics:

• FRONT PANEL LAYOUTS

• BASIC OPERATION

• OPERATING MODES

• AUTOMATIC MODE

• MANUAL MODE

• PARAMETERS AND HOW TO ACCESS THEM

• NAVIGATION DIAGRAM

• PARAMETER TABLES

• ALARMS

CN2408 and CN2404 Controller 2-1

Operation Installation and Operation Handbook

Lower readout

Manual mode active

Run/Hold button

Lower readout

Manual mode active

FRONT PANEL LAYOUTS

Setpoint 2 active

Auto mode active

Auto/Man button

OP2

OP1

200.0

200.0

SP2M REM

Program running

Program in Hold

Scroll

Button

RUN

HOLD

Down
Button

OP2

Up

Button

AUTO

MAN

Page

Button

Figure 2-1 Model CN2408 front panel layout

OP1

200.0

Output 2 onOutput 1 on

Upper readout

Remote setpoint active
(flashes for comms)

Output 2 onOutput 1 on

Upper readout

Scroll

200.0

REM

RUN

HOLD

Down

ButtonUpButton

Setpoint 2 active

Page

Button

SP2M

Button

Auto/Man button

Auto mode active

2-2 CN2408 and CN2404 Controller

AUTO

MAN

Figure 2-2 Model CN2404 front panel layout

Remote setpoint active
(flashes for comms)

Run/Hold button

Program running

Program in Hold

Operation Installation and Operation Handbook

Button or

Name Explanation

indicator

OP1 Output 1

OP2 Output 2

SP2 Setpoint 2

REM Remote setpoint

AUTO

MAN

RUN

HOLD

Auto/Manual

button

Run/Hold button

When lit, it indicates that the output installed in
module position 1 is on. This is normally the
heating output on a temperature controller.

When lit, it indicates that the output installed in
module position 2 is on. This is normally the
cooling output on a temperature controller.

When lit, this indicates that setpoint 2, (or a
setpoint 3-16) has been selected.

When lit, this indicates that a remote setpoint
input has been selected.
‘REM’ will also flash when communications is
active.

When pressed, this toggles between automatic
and manual mode:

If the controller is in automatic mode the AUTO

light will be lit.

If the controller is in manual mode, the MAN

light will be lit.
The Auto/Manual button can be disabled in

configuration level.

Press once to start a program (RUN light on.)
Press again to hold a program (HOLD light on)
Press again to cancel hold and continue

running (HOLD light off and RUN light ON)

Press and hold in for two seconds to reset a

program (RUN and HOLD lights off)

Page button Press to select a new list of parameters.

Scroll button Press to select a new parameter in a list.

Down button Press to decrease a value in the lower

readout.

Up button Press to increase a value in lower readout.

CN2408 and CN2404 Controller 2-3

Operation Installation and Operation Handbook

BASIC OPERATION

Switch on the power to the controller. It runs through a self-test sequence for about
three seconds and then shows the measured temperature, or process value, in the upper
readout and the target value, called the setpoint, in the lower readout. This is called the
Home display.

OP2OP1

Measured temperature or process value

200.0

200.0

SP2 REM

AUTO
MAN

You can adjust the setpoint by pressing the or buttons. Two seconds after
releasing either button, the display blinks to show that the controller has accepted the
new value.

OP1 will light whenever output 1 is ON. This is normally the heating output when used
as a temperature controller.

OP2 will light whenever output 2 is ON. This is normally the cooling output when used
as a temperature controller.

Note: You can get back to this display at any time by pressing and together.
Alternatively, you will always be returned to this display if no button is pressed for 45
seconds, or whenever the power is turned on.

RUN

HOLD

Figure 2-3 Home display

Setpoint

Alarms

If the controller detects an alarm condition, it flashes an alarm message in the Home
display. For a list of all the alarm messages, their meaning and what to do about them,
see Alarms at the end of this chapter.

2-4 CN2408 and CN2404 Controller

Operation Installation and Operation Handbook

OPERATING MODES

The controller has two basic modes of operation:

• Automatic mode in which the output is automatically adjusted to maintain the

temperature or process value at the setpoint.

• Manual mode in which you can adjust the output independently of the setpoint.
You toggle between the modes by pressing the AUTO/MAN button. The displays

which appear in each of these modes are explained in this chapter.

Two other modes are also available:

• Remote Setpoint mode, in which the setpoint is generated from an external source.
In this mode, the REM light will be on.

• Programmer mode which is explained in Chapter 5, Programmer Operation.

CN2408 and CN2404 Controller 2-5

Operation Installation and Operation Handbook

AUTOMATIC MODE

You will normally work with the controller in automatic mode. If the MAN light is on,
press the AUTO/MAN button to select automatic mode. The AUTO light comes on

The Home display

26.0

200.

Check that the AUTO light is on.
The upper readout shows the measured temperature.
The lower readout shows the setpoint.
To adjust the setpoint up or down, press or.

(Note: If Setpoint Rate Limit has been enabled, then the
lower readout will show the active setpoint. If or is

pressed, it will change to show and allow adjustment of,
the target setpoint.)

Press once.

Display units

26.0

x 2

OP

100.0

Pressing from the Output Power display may access further parameters. These may
be in this scroll list if the ‘Promote’ feature has been used (see Chapter 3, Edit Level).

When you reach the end of this scroll list, pressing will return you to the Home
display.

A single press of will flash the display units for 0.5

%C

seconds, after which you will be returned to the Home
display.
Flashing of the display units may have been disabled in
configuration in which case a single press will take you

Press twice.

% Output power demand

The % output power demand is displayed in the lower
readout. This is a read-only value. You cannot adjust it.

Press and together to return to the Home
display.

Press

2-6 CN2408 and CN2404 Controller

Operation Installation and Operation Handbook

MANUAL MODE

If the AUTO light is on, press the AUTO/MAN button to select manual mode. The MAN

light will come on.

The Home display

Check that the MAN light is on.
The upper readout shows the measured temperature or
process value. The lower readout shows the % output.

To adjust the output, press or

26.0

(Note: If Output Rate Limit has been enabled, then the

200.

lower readout will show the working output. If or
is pressed, it will change to show and allow adjustment of,
the target output.)

Press once

Display units

26.0

%C

A single press of will flash the display units for 0.5
seconds, after which you will be returned to the Home
display.
Flashing of the display units may have been disabled in
configuration in which case you a single press will take you
straight to the display shown below.

x 2

SP

Press twice

Setpoint

To adjust the setpoint value, press or .

25.0

Press

Pressing from the Output Power display may access further parameters. Other
parameters may be in this scroll list if the ‘Promote’ feature has been used (see Chapter

3, Edit Level). When you reach the end of this scroll list, pressing will return you
to the Home display.

CN2408 and CN2404 Controller 2-7

Operation Installation and Operation Handbook

PARAMETERS AND HOW TO ACCESS THEM

Parameters are settings within the controller that determine how it will operate.
For example, alarm setpoints are parameters that set the points at which alarms will
occur. For ease of access, the parameters are arranged in lists as shown in the navigation
diagram on the following page. The names of these lists are called the list headers. The
lists are:

Home list
Run list
Programmer list
Alarm list
Autotune list

Each list has a ‘List Header’ display.

List header displays

PID list
Motor list
Setpoint list
Input list
Output list

Communications list
Information list
Access list.

List header

AL

List

Figure 2-4 Typical list header display

A list header can be recognized by the fact that it always shows ‘LiSt’ in the lower
readout. The upper readout is the name of the list. In the above example, AL indicates
that it is the Alarm list header. List header displays are read-only.

Always displays

LiSt

To step through the list headers press Depending upon how your controller has
been configured, a single press may momentarily flash the display units. In this case, a
double press will be necessary to take you to the first list header. Continued pressing of

will step through the list headers eventually returning you to the Home display.

To step through the parameters within a particular list, press .
When you reach the end of the list, you will return to the list header.
From within a list you can return to the list header at any time can by pressing. T step

to the next list header, press once again.

Parameter names

In the navigation diagram, each box depicts the display for a selected parameter.

2-8 CN2408 and CN2404 Controller

Operation Installation and Operation Handbook

The upper readout shows the name of the parameter and the lower readout its value.
The Operator parameter tables later in this chapter list all the parameter names and their
meaning.

The navigation diagram shows all the parameters that can, potentially, be present in the
controller. In practice, only those associated with a particular configuration will appear.

The shaded boxes in the diagram indicate parameters that are hidden in normal operation.
To see all the available parameters, you must select Full access level. For more
information about this, see Chapter 3, Access Levels.

Parameter displays

Parameter name

IFSL

10.0

Figure 2-5 Typical parameter display

Parameter value

Parameter displays show the controller’s current settings. The layout of parameter
displays is always the same: the upper readout shows the parameter name and the lower

readout its value. Alterable parameters can be changed using or . In the above
example, the parameter mnemonic is 1FSL (indicating Alarm 1, full scale low), and the
parameter value is 10.0.

To change the value of a parameter

First, select the required parameter. The parameter name is shown in the upper readout
and the parameter value in the lower readout.

To change the parameter value, press either or . During adjustment, single presses
change the value by one digit.
Keeping the button pressed speeds up the rate of change.
Two seconds after releasing either button, the display blinks to show that the controller
has accepted the new value.

CN2408 and CN2404 Controller 2-9

Operation Installation and Operation Handbook

NAVIGATION DIAGRAM (PART A)

Home

List

20.0

20.0

20.0

oC

OP

100.0

m-A

Auto

AmPS

5

C.id

1

rAtE

5.0

Run

1

List

run

LiSt

PrG

1

StAt

run

PSP

20

CYC

1

SEG

1

StyP

rmP.r

SEG.t

1.0

Programmer

1

List

ProG

LiSt

PrG.n

1

Hb

OFF

Hb V

20

rmP.U

Hour

dwL.U

Hour

CYC.n

1

SEG.n

1

Alarm

List

AL

LiSt

1---

100

2---

0

3---

5

4---

5

HY 1

1

HY 2

1

HY 3

1

Autotune

List

Atun

LiSt

2

tunE

OFF

2

drA

OFF

2

drA.t

0.8

2

Adc

mAn

PID
List

Pid

LiSt

G.SP

500

SEt

Pid.1

Pb

5

ti

300

Motor

3

List

mtr

LiSt

tm

30.0

In.t

OFF

bAc.t

OFF

mp.t

Auto

td

60.0

rES.2

0.0

Hcb2

Auto

rES

0.0

Hcb

Auto

PrG.t

35.0

FASt

no

out.n

OFF

SYnc

no

SEG.d

YES

2-10 CN2408 and CN2404 Controller

tGt

200

dur

1.0

SEG.n

3

tYPE

End

tYPE

dwEl

tYPE

rmP.r

tGt

200

rAtE

5.0

SEG.n

2

tYPE

dwEl

Figure 2-6a Navigation diagram (Part A)

HY 4

1

Lb t

OFF

diAG

no

Lcb2

Auto

rEL.2

1.00

FF.Pb

0.0

FF.tr

0

FF.dv

100.0

Lcb

Auto

rEL.C

1.00

Pb2

10

ti.2

300

td.2

50.0

Operation Installation and Operation Handbook

4

NAVIGATION DIAGRAM (PART B)

Setpoint

List

SP

LiSt

SSEL

SP 1

L-r

Loc

SP 1

20.0

SP 2

0.0

rm.SP

0.0
rmt.t

0.0

rat

Off

Input

List

iP

LiSt

FiLt

Off

CAL

FACt

The parameters
that follow
depend upon
the controller
configuration.

Refer to the
parameter table.
(over Page)

They cover:
user calibration.

Output

List

oP

LiSt

OP.Lo

0.0

OP.Hi

100.0

OPrr

OFF

FOP

0.0

CYC.H

20.0

hYS.H

1.0

onT.H

Auto

Comms

List

cmS

LiSt

Addr

1

CYC.C

5.0

hYS.C

1.0

ont.C

HC.db

0.0

Information

List

inFo

LiSt

di SP

Std

LoG.L

0.0

LoG.H

100.0

LoG.A

50.0

LoG.t

1000

LoG.v

0.0

rES.L

no

Access

List

ACCS

LiSt

codE

PASS

Goto

OPEr

w.OP

0.0

FF.OP

0

VO

0

P OP

19

Loc.t

0

SP L

0.0

4

SP H

100.0

4

SP2.L

0.0

SP2.H

100.0

Hb.ty

4

Hb

SPrr

OFF

CN2408 and CN2404 Controller 2-11

Notes:

1. These lists are present only in controllers with the
programming feature.

2. The last three characters depend upon the type of alarm
configured.

3. This list is only present in motorized valve controllers.

4. Absolute setpoint limits are set in configuration, see

Lo

10

Chapter 6.

The shaded boxes are normally hidden in Operator level.
To see all the available parameters you must select Full
level. See Chapter 3, Access Levels.

Figure 2-6b Navigation diagram (Part B)

End.P

0.0

Sb.OP

100.0

mCt

0

I OP

10

d OP

1

Operation Installation and Operation Handbook

PARAMETER TABLES

Name Description

Home list

Home Measured value and Setpoint

OPOP
SPSP
m-Am-A
AmPSAmPS
C.idC.id

+ Extra parameters, if the ‘Promote’ feature has been used (see Chapter 3, Edit Level).

% Output level
Target setpoint (if in Manual mode )
Auto-man select
Heater current (With PDLINK mode 2)
Customer defined identification number

runrun
PrGPrG Active program number (Only on 4, or 20, program versions)
StAtStAt Program status (OFF, run, hoLd, HbAc, End)

PSPPSP
CYCCYC
SEGSEG
StyPStyP
SEG.tSEG.t
tGttGt
rAtErAtE
PrG.tPrG.t
FAStFASt Fast run through program (no / YES)

out.nout.n Event output states (OFF / on) (not 8-segment programmer)
SYncSYnc Segment synchronization (no / YES) (not 8-segment programmer)
SEG.dSEG.d

Program run list − Present only in setpoint programming controllers

Programmer setpoint
Number of cycles remaining in the program
Active segment number
Active segment type
Segment time remaining in the segment units
Target setpoint
Ramp rate (if a rate segment)
Program time remaining in hours

Flash active segment type in the lower readout of the home display
(no / YES)

2-12 CN2408 and CN2404 Controller

Operation Installation and Operation Handbook

Name Description

ProGProG

Program edit list − Present only in setpoint programming controller.
For a fuller explanation of these parameters refer to Chapter 5s

PrG.nPrG.n Select program number (Only on 4, or 20, program versions)
HbHb Holdback type for the program as a whole (if configured)(OFF, Lo, Hi, or

bAnd)

HbHb VV

Holdback value (in display units)

rmP.UrmP.U Ramp units (SEc, min, or Hour) [for both rmP.rrmP.r and rmP.trmP.t type

segments]

dwL.UdwL.U Dwell units (SEc, min, or Hour)
CYC.nCYC.n Number of program cycles (1 to 999, or ‘cont’)
SEG.nSEG.n
tYPEtYPE

Segment number
Segment type:(EndEnd) (rmP.rrmP.r=ramp rate) (rmP.trmP.t=ramp time) (dweldwel) (StEPStEP)

(cALLcALL)

The following parameters depend on the tYPE selected, as shown below.

End rmP.r rmP.t dwEl StEP cALL

HbHb Holdback type: OFF, Lo, Hi, or bAnd
tGttGt

3 3 3

Target setpoint for a ‘rmP’ or ‘StEP’
segment

rAtErAtE
durdur

3

3 3

Ramp rate for a ‘rmP.r’ segment
‘dwEl’ time / Time to target for a ‘rmP.t’

segment

PrG.nPrG.n
cYc.ncYc.n
outnoutn

SYncSYnc

End.tEnd.t
PwrPwr

3 3 3 3 3

3 3 3 3

3

3

cALLed ProGram number

3

No. of cycles of cALLed program
Event output: OFF/on (not 8-segment

programmer)

Segment synchronization: no/YES

(not 8-seg progr)

End of prog − dwEl, RSEt, S OP
Power level in end segment

CN2408 and CN2404 Controller 2-13

Operation Installation and Operation Handbook

Name Description

ALAL
11 -- -- -­22 -- -- -­33 -- -- -­44 -- -- --

In place of dashes, the last three
characters indicate the alarm type. See
alarm types table:

HYHY 11

HYHY 22

HYHY 33

HYHY 44

LbLb tt
diAGdiAG Enable Diagnostic alarms ‘no’ /

-FSL-FSL

-FSH-FSH

-dEv-dEv

-dHi-dHi

-dLo-dLo

-LCr-LCr

-HCr-HCr

-FL2-FL2

-FH2-FH2

-LOP-LOP

-HOP-HOP

-LSP-LSP

-HSP-HSP
4rAt4rAt

Alarm list

Alarm 1 setpoint value
Alarm 2 setpoint value
Alarm 3 setpoint value
Alarm 4 setpoint value

Alarm 1 Hysteresis (display
units)

Alarm 2 Hysteresis (display
units)

Alarm 3 Hysteresis (display
units)

Alarm 4 Hysteresis (display
units)

Loop Break Time in minutes

‘YES’

Alarm types table

PV Full scale low alarm
PV Full scale high alarm
PV Deviation band alarm
PV Deviation high alarm
PV Deviation low alarm
Load Current low alarm
Load Current high alarm
Input 2 Full Scale low alarm
Input 2 Full Scale high alarm
Working Output low alarm
Working Output high alarm
Working Setpoint low alarm
Working Setpoint high alarm
Rate of change alarm (AL 4

only)

Name Description

PidPid
G.SPG.SP

SEtSEt ‘Pid.1’ or ‘Pid.2’ selected
PbPb Proportional Band (SEt 1)

titi Integral Time in secs (SEt 1)
tdtd Derivative Time in secs (SEt 1)
rESrES Manual Reset (%) (SEt 1)
HcbHcb Cutback High (SEt 1)
LcbLcb Cutback Low (SEt 1)
rEL.CrEL.C Relative Cool Gain (SEt 1)
Pb2Pb2 Proportional Band (SEt 2)
ti2ti2 Integral Time in secs (SEt 2)
td2td2 Derivative Time in secs (SEt 2)
rES.2rES.2 Manual Reset (%) (SEt 2)
Hcb2Hcb2 Cutback High (SEt 2)
Lcb2Lcb2 Cutback Low (SEt 2)
rEL.2rEL.2 Relative Cool Gain (SEt 2)

The following three parameters are used for
cascade control. If this facility is not being
used, then they can be ignored.

FF.PbFF.Pb
FF.trFF.tr
FF.dvFF.dv

mtrmtr
tm
In.t
bAc.t
mp.t

U.br

PID list

If Gain Scheduling has been
enabled (see Chapter 4), this
parameter sets the PV below
which ‘Pid.1’ is active and
above which ‘Pid.2’ is active.

(in display units)

SP, or PV, feedforward propband
Feedforward trim %
PID feedforward limits ± %

Motor list - see Table 4-3

Valve travel time in seconds
Valve inertia time in secs
Valve backlash time in secs
Minimum ON time of output

pulse
Valve sensor break strategy

AtunAtun
tunEtunE
drAdrA
drA.tdrA.t

AdcAdc

Autotune list

One-shot autotune enable
Adaptive tune enable
Adaptive tune trigger level in

display units. Range = 1 to
9999

Automatic Droop Compensation
(PD control only)

2-14 CN2408 and CN2404 Controller