Omega Products CN2216 Installation Manual

Installation and Operation Handbook Contents

MODEL CN2216 PID CONTROLLER

INSTALLATION AND OPERATION HANDBOOK

Contents Page

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

Chapter 2 INSTALLATION........................................................... 2-1

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

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

Chapter 5 CONFIGURATION....................................................... 5-1

Chapter 6 USER CALIBRATION ................................................. 6-1

Chapter 7 ALARM CONFIGURATION........................................ 7-1

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

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

TECHNICAL SPECIFICATION...................................B-5

Issue 1; November 1998 Applies to CN2216 controller software version 3.0 i

Installation and Operation Handbook Operation

Chapter 1 OPERATION

CHAPTER PAGE

Front Panel Layout.............................................................................. 1-2

Getting Started..................................................................................... 1-4

Navigation Diagram........................................................................... 1-10

Parameter Tables............................................................................... 1-12

Setting Alarm Levels......................................................................... 1-17

Diagnostic Alarms............................................................................. 1-18

CN2216 Controller 1-1

Operation Installation and Operation Handbook

Button

Upper readout

limit active

FRONT PANEL LAYOUT

CN2216

Output 1
Output 2

Setpoint 2 active

Remote Setpoint
PDLINK

Manual mode

OP1
OP2

SP2
REM

Page

Button

Fig 1-1 Model CN2216 front panel layout

200.0 200.0

200.0 200.0

RUN

MAN

Scroll

Button

Down

Button

Up

Lower readout

Setpoint rate

1-2 CN2216 Controller

Installation and Operation Handbook Operation

Button or

indicator

OP1 Output 1

OP2 Output 2

SP2 Setpoint 2

REM Remote Setpoint

MAN Manual light

RUN Run light

Name Explanation

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

Up button Press to increase a value in lower readout.

When lit, it indicates that output 1 is on. This
is normally the heating output.

When lit, it indicates that output 2 is on. This
is normally the cooling output.

When lit, this indicates that Setpoint 2 has
been selected.

When lit, this indicates that the PDLINK
remote Setpoint input has been selected.
‘REM’ is also used to indicate that user
comms is active.

When lit, it indicates that manual mode has
been selected

When lit, it indicates that Setpoint rate limit is
active.

readout.

Figure 1.2 Controller buttons and indicators

CN2216 Controller 1-3

Operation Installation and Operation Handbook

G

H

OP1

OP2

OP1

GETTING STARTED

Thank you for selecting the Omega CN2216 controller. This section shows the principle
of operation.

VIEWING THE PROCESS VALUE and SETPOINT

Install and wire up the controller in accordance with Chapter 2 and switch on. Following
a 3-second self-test sequence, this is the display you will see,

Output 1
Output 2

Fig. 1.3 The “Home Display”

NOTE

*

TO ADJUST THE SETPOINT

The display may flash an alarm message. Refer to the Parameter Tables later in
this chapter for a complete list and meaning of the messages.

140.0140.0

Press and hold to
decrease temperature

20.020.0

23.023.0

20.020.0

Actual Temperature (Process Value)

Required Temperature (Setpoint)

Press and hold to
increase temperature

Fig 1.4 The lower readout shows the setpoint

After 2 secs the lower readout will ‘blink’ indicating that the new value has been
accepted. For everyday use you may not need to do anymore than this.

1-4 CN2216 Controller

Installation and Operation Handbook Operation

VIEWING THE DISPLAY UNITS

Display Units

oo

0.5 sec.

23.0 23.0

23.0 23.0

o o

CC

CC Degrees Centigrade

oo

FF Degrees Fahrenheit

oo

KK Degrees Kelvin

No units - Linear inputs

140.0140.0

Momentarily
press either

G

NOTE

*

USE OF THE “SCROLL” BUTTON

Pressing the scroll button will display the output power level. Continued pressing will
display further parameters in what is referred to as the operator scroll list.

If you get lost, pressing and together will return you to the Home
display

Fig. 1.5 Pressing or will flash the display units for 0.5 sec

2nd press

buttonG

OP OP

100.0100.0

m-A m-A

AutoAuto

Keep pressing to return to
Home display or select further
parameters (if available)

Fig. 1.6 Upper readout is parameter name. Lower is value

CN2216 Controller 1-5

Output

Actual output level %

3rd press

Manual/Auto

Actual state

Operation Installation and Operation Handbook

**

USE OF THE PAGE BUTTON

The “PAGE” button accesses parameter LISTS
Parameters are settings in the instrument which, generally, can be changed by the user to
suit the process. Examples are: Alarms, Self-Tune, etc. They are found under headings
called LISTS and a full set is given later in this chapter.

Fig 1.7 Press to choose a parameter list

0.5 sec.

23.023.0

oo

23.0 23.0

CC

140.0140.0

1st press

NOTE

23.023.0

14.0.014.0.0

2nd press

ALAL

LiSt LiSt

3rd press

Keep pressing to
select more list headings and
continue around a continuous loop

atunatun

LiStLiSt

The actual list headings may be longer or shorter than indicated above and you
can customize this for the operator’s convenience in EDIT level, Chapter 3.

1-6 CN2216 Controller

Installation and Operation Handbook Operation

PARAMETER LISTS

Press to choose a LIST - “ALARMS” is a good one. This list allows you to set the
alarm trip levels. The parameters, which appear in the list, will vary according to the
configuration of your controller.

0.5 sec.

23.0 23.0

o o

23.0 23.0

140.0140.0

CC

1st press

G

Fig. 1.8a Choose a list

There are 4 alarms in
the controller. The first
character is the alarm
number. The following
three letters indicate
alarm type as follows:

-FSL-FSL Full S

-FSH-FSH Full Scale High

-dHi-dHi Deviation High

-dLo-dLo Deviation Low

-dEv-dEv Deviation Band

Disabled alarms will not
be displayed.
Chapter 7 gives a full
description of alarms.

Fig. 1.8b Press to select a parameter

cale Low

Alarm
List

2nd press

Keep pressing

1. to scroll through further parameters

2. to return to list header

ALAL

LiSt LiSt

1---1---

50.0 50.0

2---2---

200.0 200.0

Now press
the SCROLL
button

Alarm 1

or to
change trip level

2nd press

Alarm 2

or to
change trip level

NOTE

**

CN2216 Controller 1-7

If, at any time, no key is pressed within 45 seconds, the display will always
return to the “HOME” display.

Operation Installation and Operation Handbook

OPERATING MODES

The controller can be used in two modes:
Automatic mode - in which the output power is automatically adjusted to hold the
temperature at the required value. The controller normally operates in this mode.
Manual mode - in which the output is manually adjusted by the Operator. In this mode
the ‘MAN’ light will be on.

One other mode is available:
Remote setpoint - The setpoint is generated as an input signal from a master CN2216
series controller. In this mode the REM light is on.

AUTO or MANUAL SELECT

0.5 sec.

23.0 23.0

o o

CC

1st press

2nd press

ut

Outp
Actual output level %

140.0140.0

OP OP

100.0100.0

23.023.0

3rd press

m-A m-A

mAn mAn

Keep pressing
to return to “HOME”
display

1-8 CN2216 Controller

Manual/A

AutoAuto automatic mode
ManMan manual mode

Fig. 1.9 Auto/manual select

uto

or to select

Installation and Operation Handbook Operation

OP1

OP2

MAN

G

H

**

MANUAL ADJUSTMENT OF OUTPUT POWER

23.0 23.0

50.0 50.0

Press and hold to
decrease power

Fig. 1.10 The “Home Display” in manual mode

NOTE

SUMMARY

To step through list headers, press the Page button until the required header is
obtained

To step through parameters within a particular list, press the Scroll button until the
required parameter is obtained

Manual mode is generally used for test and commissioning purposes, take care
not to leave the controller in this mode since damage or personal injury could
occur.

Actual Temperature (Process Value)
Output Power Demand

Manual Indicator on

Press and hold to
increase power

To change the value (or state) of a parameter, press the Raise button or the Lower
button

The remainder of this chapter provides a complete list of all parameters available.

CN2216 Controller 1-9

Operation Installation and Operation Handbook

AtunAtun

(1)

List

2

2

2

2

3

3

3

NAVIGATION DIAGRAM (Part A)

Home

List

20.020.0

20.020.0

OP

100.0

AmPS

5

m-A

Auto

Alarm

AL AL

LiStLiSt

1---

100.0

2---

20.00

3---

Autotune
List

LiStLiSt

TunE

OFF

Adc

mAn

0

4---

0

Lbt

OFF

The navigation diagram shows a full
list of possible parameters.
However, some may not appear
because they are dependent upon
the particular controller variant.

PID
List

PidPid

LiStLiSt

Pb

50

Ti

300

td

50.0

RES

0.0

Lcb

Auto

Hcb

Auto

REL.C

1.00

Setpoint
List

SPSP

LiStLiSt

SSEL

SP 1

L-r

Loc

SP 1

20.0

SP 2

0.0

Rm.SP

0.0

Loc.t

0.0

SP1.L

3

Notes:

SP1.H

1. Either the PID list or the On/Off list will be
present depending upon the type of control in
use.

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

SP2.L

100.0

SP2.H

3. Absolute setpoint limits are set in configuration,
see Chapter 5.

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

Loc.L

100.0

Loc.H

Chapter 3, Access Levels.

Figure 1.11a Navigation diagram

SPrr

OFF

1-10 CN2216 Controller

0.0

0.0

Installation and Operation Handbook Operation

NAVIGATION DIAGRAM (PART B)

Input
List

IP

LiSt

FiLt

1.0

CAL

FACT

CAL.L

Adj.L

CAL.H

Adj.H

CJC

21.0

MV

1.17

no

no

Output
List

oP

LiSt

OP.Lo

100.0

OP.Hi

0.0

Sb.OP

100.0

4

CYC.C

5.0

On Off

(1)

List

OnOF

LiSt

hYS.H

1.0

hYS.C

1.0

HC.db

0.0

Comms
List

CmS

LiSt

Addr

Access
List

ACCS

LiSt

Return to
“HOME” Display

coDE

1

PASS

Goto

OPEr

ConF

0

Ont.C

1.0

4

CYC.H

20.0

Ont.H

1.0

Note:

4. Beware! Used for calibration. See 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 1.11b Navigation diagram

CN2216 Controller 1-11

Operation Installation and Operation Handbook

PARAMETER TABLES

Name Parameter Description Default Value Minimum Maximum Units Customer Setting

UK USA Value Value

Home List

Home Measured Value and Setpoint(SP)

OP
AmPS
m-A

Additional parameters may appear in the Home display if the ‘promote’ feature has been used (see Edit Level, Chapter 3).

% Output Level
Heater current (PDLINK modes 2) Amps
Auto/manual select
Working Setpoint

SP=25 SP=25

0.00 100.00

Auto Auto

as display
%

ALAL

1--­2--­3--­4---

In place of dashes, the last three characters indicate the alarm type, as follows:

-FSH

-FSL

-DEv

-dHi

-dLo
Lbt

1-12 CN2216 Controller

Alarm List

Alarm 1 set point value
Alarm 2 set point value
Alarm 3 set point value
Alarm 4 set point value

Full Scale High alarm
Full Scale Low alarm
Deviation band alarm
Deviation High alarm
Deviation Low alarm
Loop break time

0 0 0 9999
0 0 0 9999
0 0 0 9999
0 0 0 9999

OFF OFF 0 9999

as display
as display
as display
as display

secs

Operation Installation and Operation

Name Parameter Description Default Value Minimum Maximum Units Customer Setting

UK USA Value Value

AtunAtun

TunE
Adc

PidPid

Pb
Ti
Td
Res
Lcb
Hcb
REL.C

1-13 CN2216 Controller

Autotune List

Self tune enable
Automatic droop compensation (Manual

Reset) enable (only present if ti set to OFF

PID List

Proportional band
Integral time
Derivative time
Manual reset (appears when ti set to OFF)
Cutback low
Cutback high
Relative cool gain (normally set to 1)

OFF OFF OFF ON
MAN MAN MAN CALC

20.0 0.0 9999
360 OFF 9999
60 OFF 9999

0.0 0.00 100.0
Auto 1 9999
Auto 1 9999

1.00 0.01 9.99

as display
seconds
seconds
%
as display
as display

Operation Installation and Operation Handbook

Name Parameter Description Default Value Minimum Maximum Units Customer Setting

UK USA Value Value

SPSP

SSEL
L-r
SP1
SP2
rm.SP
Loc.t
SP1.L
SP1.H
SP2.L
SP2.H
Loc.L
Loc.H
SPrr

Set Point List

Select SP1 or SP2
Local or remote PDLINK setpoint select *
Setpoint 1 value
Setpoint 2 value
Remote setpoint
Local trim
Setpoint 1 low limit
Setpoint 1 high limit
Setpoint 2 low limit
Setpoint 2 high limit
Local setpoint trim low limit
Local setpoint trim high limit
Setpoint rate limit

SP1 SP1 SP2
Loc Loc rmt
25
25
0
0
0
1000
0
1000

-210
1200
OFF

As display range
As display range
As display range
As display range
As display range
As display range
As display range
As display range
As display range
As display range
As display range

•• Only appears if PDLINK fitted and configured in the HA comms slot

1-14 CN2216 Controller

Operation Installation and Operation

Name Parameter Description Default Value Minimum Maximum Units Customer

Settings

UK USA Value Value

iPiP

FiLt

Input list

Input filter time constant

1.6 1.6 1.0 999.9

secs

The next 5 parameters will appear if User calibration has been enabled in configuration level. To perform a user calibration refer to Ch 6.

CAL

FACt will re-instate factory settings and disable User Calibration. Default setting FACt
USEr will re-instate any previously set User Calibration offsets and make available User Calibration parameters as follows:

CAL.L User low point calibration if YES allows access to next parameter. if no the next parameter is hidden

*

AdJ.L

Adjust low point to calibrated ref. source

CAL.H User high point calibration if YES allows access to the next parameter if no the next parameter is hidden

*

AdJ.H

Adjust high point to calibrated ref. source

The following two parameters are always present in Full Access level but not in Operator level

o

CJC
mV

*

Do not make adjustments to the AdJ.L or AdJ.H parameters unless you wish to offset the controller calibration

Cold Junction compensation temperature
Millivolt input

oPoP Output list Note; If On/Off control is configured only Sb.OP, ont.H and ont.C will appear in the following list

OP.Lo
OP.Hi
Sb.OP
CYC.H
CYC.C

ont.H

ont.C

Low (power) output limit
High (power) output limit
Output setting when in sensor break
Heat cycle time
Cool cycle time

Heat output min. on time
Cool output min. on time

0.0 or -100.0 (cool) -100.0 100.0

100.0 100.0 -100.0 100.0

0.0 or -100.0 (cool) -100.0 100.0

1.0 (logic) 20 (relay) 0.2 999.9

1.0 (logic) 20 (relay) 0.2 999.9

0.1 0.1 Auto (50mS) 1.0

0.1 0.1 Auto (50mS) 1.0

%
%

%
secs
secs

mins
mins

1-15 CN2216 Controller

Operation Installation and Operation Handbook

Name Parameter Description Default Value Minimum Maximum Units Customer Setting

UK USAValue Value

OnOfOnOf

This set of parameters only appear if On/Off control has been configured

hYS.H
hYS.C
HC.db

cmScmS

Addr

ACCSACCS

codE
Goto Goto level -OPEr,FuLL,Edit,or

ConF

1-16 CN2216 Controller

On/off list

Heat hysteresis
Cool hysteresis
Heat/Cool dead band

C omms list

Communications address

Access list

Full and Edit level password

conF

Configuration level password

0 0 0 9999
0 0 0 9999
1 1 0 9999

1 1 1 254

1 1 0 9999
OPEr OPEr OPEr conF

2 2 0 9999

as display
as display
as display

Installation and Operation Handbook Operation

SETTING ALARM LEVELS

Up to 4 Alarms may be configured. Each alarm is given a name to describe its function ­see table below: If an alarm is not used it does not appear in the list below.

In place of dashes,
letters indicate alarm
type as follows:

-FSL Full S

-FSH Full Scale High

-dHi Deviation High

-dLo Deviation Low

-dEv Deviation Band

cale Low

ALAL

LiSt LiSt

1---1---

100100

2---2---

200200

3---3---

00

4---4---

00

Alarm List

Alarm 1

or to change

2nd press

Alarm 2

or to change

3rd press

Alarm 3

or to change

4th press

Alarm 4

or to change

5th press

Lb tLb t

OFFOFF

Press to return
to list header

CN2216 Controller 1-17

Loop break time

or to change

Operation Installation and Operation Handbook

Diagnostic alarms

These indicate that a fault exists in either the controller or the connected devices.

Table 1.1a Diagnostic alarms - continued on the next page

Display

shows

EE.Er

S.br

L.br

Ld.F

SSr.F

What it means What to do about it

Electrically Erasable
Memory Error:

The value of an operator
or configuration
parameter has been
corrupted.

Sensor Break:

Input sensor is unreliable
or the input signal is out
of range.

Loop Break:

The feedback loop is
open circuit.

Load failure

Indication that there is a
fault in the heating circuit
or the solid state relay.

Solid state relay failure

Indication that there is a
fault in the solid state
relay

This fault will automatically take you into
configuration level. Check all of the
configuration parameters before returning to
operator level. Once in operator level, check
all of the operator parameters before
resuming normal operation. If the fault
persists or occurs frequently, contact Omega .

Check that the sensor is correctly connected.

Check that the heating and cooling circuits
are working properly.

This is an alarm generated by feedback from
a Omega SSC-TE10S solid state relay (SSR)
operating in PDLINK mode 1-see Electrical
installation Chapter 2. It indicates either an
open or short circuit SSR, blown fuse, missing
supply or open circuit heater.

This is an alarm generated by feedback from
a Omega SSC-TE10S solid state relay (SSR)
operating in PDLINK mode 2 -see Electrical
installation Chapter 2. It indicates either an
open or short circuit condition in the SSR.

Htr.F

HW.Er

1-18 CN2216 Controller

Heater failure

Indication that there is a
fault in heating circuit

Hardware error

Indication that a module
is of the wrong type,
missing or faulty

This is an alarm generated by feedback from a
Omega SSC-TE10S solid state relay (SSR)
operating in PDLINK mode 2 -see Electrical
installation Chapter 2. It indicates either a
blown fuse, missing supply or open circuit
heater.

Check that the correct modules are fitted.

Installation and Operation Handbook Operation

Diagnostic alarms continued

These indicate that a fault exists in either the controller or the connected devices.

Table 1.1b Diagnostic alarms

Display

shows

rmt.F

LLLL

HHHH

Err1

Err2

Err3

Err4

Err5

Pwr.F

What it means What to do about it

Remote input failure. The
PDLINK input is open
circuit

Out of Display range, low
reading

Out of Display range, high
reading

Error 1: ROM self-test fail
Error 2: RAM self-test fail
Error 3: Watchdog fail
Error 4: Keyboard failure

Stuck buttons, or a button

was pressed during power
up.

Error 5: Input circuit failure
Power failure. The line

voltage is too low

Check for open or short circuit wiring on the
PDLINK input

Check the value of the display range

Check the value of the display range

Return the controller for repair
Return the controller for repair
Return the controller for repair
Switch the power off and then on without

touching any of the controller buttons.

Return the controller for repair
Check that the supply to the controller is

within the rated limits

CN2216 Controller 1-19

Installation and Operation Handbook Installation

Chapter 2 INSTALLATION

7

8

6

8

4

5

2

1

3

2

4

KEY

1. Display screen

2. Latching ears

3. Panel sealing gasket

4. Panel retaining clips

5. Label

6. Sleeve

7. Terminal covers

8. Ratchets

Figure 2-1 CN2216 1/16 DIN Controller

CN2216 Controller 2-1

Installation Installation and Operation Handbook

CN2216

OP1

OP2

SP2

Re

Outline dimensions Model CN2216

48mm

1.89in

48mm (1.89in)

20.0.020.0.0

20.0.0 20.0.0

Panel cutout

-0 +0.8

45 x 45

1.89 x 1.89

mm

-0 +0.03

in

Recommended
minimum
spacing of
controllers

103mm (4.01in)

10mm
(0.4in)

38mm
(1.5in)

(Not to
scale)

Figure 2-2 Outline dimensions Model CN2216 controller

The controller plugs into a plastic sleeve, which in turn fits into the panel cut-out shown
above.

2-2 CN2216 Controller

Installation and Operation Handbook Installation

INTRODUCTION

The model CN2216 is a precision temperature controller with self-tuning. It has a modular
hardware construction, which provides two control outputs, one alarm relay and one
communications port.

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

Cut the panel to the relevant hole size shown in Figure 2-2.
Insert the controller through the front of this cut-out.
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, they can be unhooked from

the side with either your fingers or a screwdriver.

Unplugging and plugging-in the controller

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 it’s sleeve,
ensure that the latching ears click into place to maintain the IP65 sealing.

CN2216 Controller 2-3

Installation Installation and Operation Handbook

85-264Vac

WIRING

Please read Appendix B, safety and EMC information before proceeding.

WARNING

Please ensure that the controller is correctly configured for your
application. Incorrect configuration could result in damage to the process
being controlled, and/or personal injury. The controller may either have
been configured when ordered, or may need configuring now. See Chapter
5, Configuration.

Line

L
N

Neutral
Ground*

+

+

PV

-

Output 1

Output 2

Output 3

1A
1B
2A
2B
3A
3B

Comms

HD
HE
HF

V1

V+

V-

Pt100

Figure 2-3 Model CN2216 wiring connections

* The ground connection is not required for safety purposes but must be connected to satisfy
EMC requirements.

Wire Sizes

All electrical connections are made to the screw terminals at the rear of the controller. These
accept wire sizes from 0.5 to 1.5 mm

2

(16 to 22 AWG), and are protected by a hinged cover
to prevent hands or metal making accidental contact with live wires. Rear terminal screws
should be tightened to a torque of 0.4 Nm (3.5 lb. in).

Wiring connections

The wiring connections are shown above.
Outputs 1 and 2 are factory fitted modules, which can be any one of the types shown in

figure 2-5.

2-4 CN2216 Controller

Installation and Operation Handbook Installation

Sensor input connections

The connections for the various types of input are as follows:

Thermocouple

VI

V+

V-

Resistance

thermometer

VI

V+

V-

Fig 2-4 Sensor input connections

mA input Volts or mV inputs

VI

V+

V-

2.49Ω
current
sense
resistor

VI

V+

V-

+

PV

-

OUTPUTS 1 AND 2 CONNECTIONS

Outputs 1 and 2 can be any one of the types shown in the table below. Configured to
perform any one of the functions shown.

To check which outputs are installed, and their configuration, refer to the ordering code and
the wiring information on the controller side labels.

Connections

Output 1 Output 2 Possible functions

Module type 1A 1B 2A 2B

Relay: 2-pin

(2A, 264 Vac max.)

DC Pulse:

non-isolated

(18Vdc at 24mA)

+ - + -

Heating
Cooling

Alarms

PDLINK modes 1 or

2
Heating
Cooling

Alarms

AC SSR

(1A, 30 to 264Vac)

DC control: isolated

(18Vdc, 20mA max)

CN2216 Controller 2-5

Line Load

+

Figure 2-5 Outputs 1 and 2 connections

Line Load

DC not available

-

in output 2

Heating or cooling

PID Heating or

cooling

Installation Installation and Operation Handbook

PDLINK modes

PDLINK is a proprietary technique for bi-directional communication over a single pair of
wires. There are several operating modes.

In mode 1 a dc pulse output delivers a power demand signal to a SSC-TE10S solid state
(SSR) relay and the SSR responds with a single load circuit failure message.

In mode 2 a dc pulse output delivers a power demand signal to a SSC-TE10S and the SSR
responds with the ON state rms load current, and two fault messages - SSR failure or heater
circuit failure.

Snubbers

The controller is supplied with ‘snubbers’ (15nF +100Ω) which should be wired across the
relay or triac outputs when switching inductive loads such as mechanical contactors and
solenoid valves. The snubbers are used to prolong contact life and to suppress interference
when switching such loads.

Snubbers pass 0.6mA at 110Vac and 1.2mA at 240Vac, which may be sufficient to hold in
high impedance relay coils. They should not, therefore, be used in such installations.

WARNING
When a relay contact is used in an alarm circuit ensure that the
current passing through the snubber when the relay contact is
open does not hold in low power electrical loads and thereby
interfere with the fail-safe operation of the alarm circuit.

COMMUNICATIONS CONNECTIONS

The communications option can either of two types shown in the table below

Connection

Communications type

2 wire RS-485 (EIA- 485)
serial communications

PDLINK Setpoint input Not used Signal Common

Figure 2-6 Communication connections

The RS-485 (EIA 485) module can be configured for Modbus® protocol.

2-6 CN2216 Controller

HD HE HF

Common A B

Installation and Operation Handbook Installation

Wiring of RS-485 (EIA 485) serial communication links

PC

Com

Local
Earth

232

Local
Earth

Com RX TX

Universal Communications

Isolator / convertor

Com B

Local
Earth

RXTX

A

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 communications
isolator/converter to connect the RS-485 (EIA-485) link into a
standard RS-232 (EIA-232) computer port.

HE

Com

A

HF

B

HD

CN2216
Controller

Local
Ground
Zone 1

Local
Earth

Local
Ground
Zone 1

Local
Earth

Local
Ground
Zone 1

Local
Earth

Area 1

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.

A

Galvanic

B

Isolation

Barrier

Com

Up to 32 CN2216 controllers
I may be included

or
on the network

E

A

HE

B

HF

F

Com

D

HD

Figure 2-7 RS-485 (EIA 485) wiring

A
B
Com

CN2216
Controller

Local
Ground
Zone 1

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

Local
Ground
Zone 2

Local Earth

Com

HE
HF
HD

CN2216
Controller

A
B

CN2216 Controller 2-7

Installation Installation and Operation Handbook

Neutral

(load dependent)

Solenoid Valve

Thermocouple

2A(T)

+

Line

TYPICAL WIRING DIAGRAM

Cooling Power
Fuse 1A(T)

Controller
Fuse

1A
1B
2A
2B
3A
3B

Comms

CN2216

-

Solid State

Relay

HD
HE
HF

L

N

V1
V+

V-

Heating power fuse

Cooling

Fig 2-8 Typical wiring diagram, Model CN2216 Controller

2-8 CN2216 Controller

Heater

Installation and Operation Handbook Access Levels

Chapter 3 ACCESS LEVELS

This chapter describes the different levels of access to the operating parameters within
the controller.

There are three topics:

• THE DIFFERENT ACCESS LEVELS

• SELECTING AN ACCESS LEVEL

• EDIT LEVEL

THE DIFFERENT ACCESS LEVELS

There are four access levels:

• Operator level, which you will normally use to operate the controller

• Configuration level, which is used to set up the fundamental characteristics of the

controller

• Full level, which is used to commission the controller and the process being

controlled

• Edit level, which is used to set up the parameters that you want an operator to be able

to see and adjust when in Operator level.

Access level Display

Operator

Full

Edit

Configuration

CN2216 Controller 3-1

shows

OPEr

FuLL

Edit

ConF

What you can do Password

In this level operators can view and adjust
the value of parameters defined in Edit
level (see below).

In this level all the parameters relevant to
a particular configuration are visible. All
alterable parameters may be adjusted.

In this level you can set which parameters
an operator in Operator level is able to
view and adjust. You can hide or reveal
complete lists and individual parameters
within each list, and you can make
parameters read-only or alterable. (See
Edit level at the end of the chapter).

This special level allows access to set up
the fundamental characteristics of the
controller.

Figure 3-1 Access levels

Protection

No

Yes

Yes

Yes

Access Levels Installation and Operation Handbook

SELECTING AN ACCESS LEVEL

Access to Full, Edit or Configuration levels is protected by a password to prevent
unauthorised access.
If you need to change the password, see Chapter 5, Configuration.

Access list header

AccS
LiSt

Code
0

Press until you reach the access list header ‘ACCS’.

Press the Scroll button

Password entry

The password is entered from the ‘CodE’ display.

Enter the password using the or buttons
Once the correct password has been entered, there is a two
second delay after which the lower readout will change to
show ‘PASS’ indicating that access is now unlocked.
The pass number is set to ‘1’ when the controller is shipped
from the factory.

Note: A special case exists if the password has been set to
‘0’. In this case access will be permanently unlocked and
the lower readout will always show ‘PASS’

Press the Scroll button to proceed to the ‘Goto’ display.

(If an incorrect password has been entered and the
controller is still ‘locked’ then pressing Scroll at this point
will simply return you to the aCCs list header.)

.

Note: From this ‘CODE’ display you can access ‘read only’

configuration level by pressing and

To escape read only configuration press and
together

3-2 CN2216 Controller

together.

Installation and Operation Handbook Access Levels

Level selection

Goto

GotO

FuLL

FuLL

AccS
LiSt

Alternative path if
‘conF’ selected

Conf
PASS

The ‘Goto’ display allows you to select the required
access level.

Use and to select from the following
display codes:

Press the Scroll button

If you selected either ‘OPEr, FuLL or Edit level you
will be returned to the ‘ACCS list header in the level that
you chose. If you selected ‘conF’, you will get an
alternative display showing ‘ConF’ in the upper readout
(see below).

Configuration password

When the ‘ConF’ display appears, you must enter the
Configuration password in order to gain access to
Configuration level. Do this by repeating the password
entry procedure described in the previous section
The configuration password is set to ‘2’ when the controller
is shipped from the factory. If you need to change the
configuration password, see Chapter 5, Configuration

Press the Scroll button

OPEr: Operator level

FuLL: Full level
Edit: Edit level
conF: Configuration level

Configuration level

The first display of configuration is shown. See chapter

inST
Con

Returning to Operator Level

To return to operator level from either ‘FuLL’ or ‘Edit’ level, repeat entry of the
password and select ‘OPEr’ on the ’Goto’ display.
In ‘edit’ level the controller will automatically return to operator level if no button is
pressed for 45 seconds.

CN2216 Controller 3-3

5, Configuration for details of the configuration
parameters.
For instructions on leaving configuration level see
Chapter 5, Configuration.

Access Levels Installation and Operation Handbook

EDIT LEVEL

Edit level is used to set which parameters you can see and adjust in Operator level. It
also gives access to the ‘Promote’ feature which allows you to select and add (‘Promote’)
up to twelve parameters into the Home display list, thereby giving simple access to
commonly used parameters.

Setting operator access to a parameter

First you must select Edit level, as shown on the previous page.
Once in Edit level, you select a list or a parameter within a list in the same way as you

would in Operator or Full level. That is to say, you move from list header to list header
by pressing the Page button. And, from parameter to parameter within each list using the
Scroll button. However, in Edit level what is displayed is not the value of a selected

parameter but a code representing the parameter’s availability in Operator level.

When you have selected the required parameter, use the and buttons to set
its availability in operator level.

There are four codes:

ALtrALtr Makes a parameter alterable in Operator level
ProPro Promotes a parameter into the Home display list
REAdREAd Makes a parameter or list header read-only (it can be viewed but not altered)
HidEHidE Hides a parameter or list header.

For example:

2FSL

The parameter selected is the set point for
Alarm 2 - Full Scale Low

ALtr

Hiding or revealing a complete list

To hide a complete list of parameters, all you have to do is hide the list header. If a list
header is selected only two selections are available: REAd and HidE.
(It is not possible to hide the ‘ACCS’ list, which will always display the code: ‘LiSt’.)

Promoting a parameter

Scroll through the lists to the required parameter and choose the ‘Pro’ code. The
parameter is then automatically added(promoted) into the Home display list (the
parameter will also be accessible as normal from the standard lists. A maximum of
twelve parameters can be promoted. Promoted parameters are automatically ‘alterable’.

3-4 CN2216 Controller

Installation and Operation Handbook Tuning

Chapter 4 TUNING

Before tuning please read Chapter 1, Operation, to learn how to select and change a
parameter.

This chapter has three main topics:

• WHAT IS TUNING?

• AUTOMATIC TUNING

• MANUAL TUNING

WHAT IS TUNING?

In tuning you match the characteristics of the controller to that of the process being
controlled in order to obtain good control. Good control means:

• Stable ‘straight-line’ control of the temperature at setpoint without fluctuation

• Acceptable overshoot or undershoot of the temperature setpoint

• Quick response to deviations from the setpoint caused by external disturbances,

thereby restoring the temperature rapidly to the setpoint value.

Tuning involves calculating and setting the value of the parameters listed in Table 4-1.
These parameters appear in the PID list.

Table 4-1 Tuning parameters

Parameter Code Meaning or Function

Proportional

band

Integral time

Derivative

time

Low cutback

High Cutback

Relative cool

gain

CN2216 Controller 4-1

Pb

ti

td

Lcb

Hcb

rEL.C

The bandwidth in display units over which the output power
is proportioned between minimum and maximum.

Determines the time taken by the controller to remove
steady-state error signals.

Determines how strongly the controller will react to the rate­of-change of the measured value.

The number of display units below setpoint at which the
controller will cutback the output power in order to prevent
overshoot on heat up.

The number of display units above setpoint at which the
controller will increase the output power in order to prevent
undershoot on cool down.

Only present if cooling has been configured. Sets the
cooling proportional band by dividing the Pb value by the
rEL value.

Tuning Installation and Operation Handbook

AUTOMATIC TUNING

This method automatically determines the value of the parameters listed in table 4-1 on
the previous page.

The CN2216 uses a ‘one-shot’ tuner which works by switching the output on and off to
induce an oscillation in the measured value. From the amplitude and period of the
oscillation, it calculates the tuning parameter values.

If the process cannot tolerate full heating or cooling being applied during tuning, then the
level of heating or cooling can be restricted by setting the heating and cooling power
limits in the Output list. However, the measured value must oscillate to some degree for
the tuner to be able to calculate values

A One-shot Tune can be performed at any time but normally it is performed only once
during the initial commissioning of the process. However, if the process under control
subsequently becomes unstable (because its characteristics have changed), you can re­tune again for the new conditions.

It is best to start tuning with the process at ambient temperature. This allows the tuner to
calculate more accurately the low cutback and high cutback values that restrict the
amount of overshoot or undershoot.

Heating and Cooling Output Cycle Times

Before commencing a tuning cycle, set the values of CYC.H (heat cycle time) and CYC.C
(cool cycle time) in the oP (output) list. These values apply if you are using a dc pulse,
relay or AC SSR output. They have no effect on a DC output.

A dc pulse output switching a solid state relay should be set to 1 sec.
A relay or AC SSR output should be set to 20 sec.

4-2 CN2216 Controller

Installation and Operation Handbook Tuning

How to tune

1. Set the setpoint to the value at which you will normally operate the process.

2. In the ‘Atun’ list, select ‘tunE’ and set it to ‘on’

3. Press the Page and Scroll buttons together to return to the Home display. The
display will flash ‘tunE’ to indicate that tuning is in progress.

4. The controller will induce an oscillation in the temperature by turning the
heating on and then off. The first cycle will not complete until the measured
value has reached the required setpoint.

5. After two cycles of oscillation the tuning will be completed and the tuner will

switch itself off.

6. The controller will then calculate the tuning parameters listed in Table 4-1 and

will resume normal control action.

If you want ‘Proportional only’ or ‘PD’ or ‘PI’ control, you should set the ‘ti’ or ‘td’
parameters to OFF before commencing the tuning cycle. The tuner will leave them off
and will not calculate a value for them.

Typical automatic tuning cycle

Temperature

Setpoint

Time

Calculation of the cutback values

Low cutback and High cutback are values that restrict the amount of overshoot or
undershoot that occurs during large step changes in temperature (for example, under
start-up conditions).

If either low cutback or high cutback is set to ‘AUTOAUTO’ the values will be fixed at three
times the proportional band, and will not be changed during automatic tuning.

CN2216 Controller 4-3

Tuning Installation and Operation Handbook

MANUAL TUNING

If for any reason automatic tuning gives unsatisfactory results, you can tune the controller
manually. There are a number of standard methods for manual tuning. The one
described here is the Ziegler-Nichols method.

With the process at its normal running temperature:

1. Set the Integral Time ‘ti’ and the Derivative Time ‘td’ to OFF.

2. Set High Cutback and Low Cutback, ‘Hcb’ and ‘Lcb’, to ‘Auto’

3. Ignore the fact that the temperature may not settle precisely at the setpoint

4. If the temperature is stable, reduce the proportional band ‘Pb’ so that the temperature
just starts to oscillate. If the temperature is already oscillating, increase the
proportional band until it just stops oscillating. Allow enough time between each
adjustment for the loop to stabilize. Make a note of the proportional band value
‘B’(engineering units) and the period of oscillation ‘T’ (seconds or minutes).

5. Set the Pb, ti, td parameter values according to the calculations given in Table 4-2.

Table 4-2 Tuning values

Type of control Proportional

band ‘Pb’

Proportional only 2xB OFF OFF

P + I control 2.2xB 0.8xT OFF

P + I + D control 1.7xB 0.5xT 0.12xT

Integral time ‘ti’ Derivative time

‘td’

4-4 CN2216 Controller

Installation and Operation Handbook Tuning

Setting the cutback values

The above procedure sets up the parameters for optimum steady state control. If
unacceptable levels of overshoot or undershoot occur during start-up or for large step
changes in temperature, then manually set the cutback parameters Lcb and Hcb.

Proceed as follows:

1. Set the low and high cutback values to three proportional bandwidths (that is to
say, Lcb = Hcb = 3 x Pb).

2. Note the level of overshoot or undershoot that occurs for large temperature
changes (see the diagrams below).

In example (a) increase Lcb by the overshoot value. In example (b) reduce Lcb by the
undershoot value.

Example (a)

Temperature

Overshoot

T

Setpoint

Example (b)

Temperature

Setpoint

Undershoot

Time

Where the temperature approaches setpoint from above, you can set Hcb in a similar
manner.

CN2216 Controller 4-5

Tuning Installation and Operation Handbook

Integrating action and manual reset

In a full three-term controller (that is, a PID controller), the integral term ‘ti’
automatically removes steady state errors from the setpoint. If the controller is set up to
work in two-term mode (that is, PD mode), the integral term will be set to ‘OFF’. Under
these conditions the measured value may not settle precisely at setpoint. When the
integral term is set to OFF the parameter manual reset (code rES) appears in the PID
List in ‘FuLL’ Access level. This parameter represents the value of the power output
that will be delivered when the error is zero. You must set this value manually in order
to remove the steady state error.

Automatic droop compensation (Adc)

The steady state error from the setpoint, which occurs when the integral term is set to
‘OFF’, is sometimes referred to as ‘droop’. Adc automatically calculates the manual
reset value in order to remove this droop. To use this facility, you must first allow the
temperature to stabilise. Then, in the autotune parameter list, you must set Adc to
‘CALC’. The controller will then calculate a new value for manual reset, and switch

Adc to ‘mAn’.
Adc can be repeated as often as you require, but between each adjustment you must

allow time for the temperature to stabilize.

4-6 CN2216 Controller

Installation and Operation Handbook Configuration

Chapter 5 CONFIGURATION

Selecting Configuration Level............................................................ 5-2

Selecting a Configuration Parameter ................................................ 5-3

Leaving Configuration ........................................................................ 5-3

Navigation Diagram............................................................................. 5-4

Parameter Tables................................................................................. 5-6

WARNING

Configuration is protected by a password and should only be carried out by an
authorised person. Incorrect configuration could result in damage to the process
being controlled and/or personal injury. It is the responsibility of the person
commissioning the process to ensure that the configuration is correct.

CN2216 Controller 5-1

Configuration Installation and Operation Handbook

(factory default = 2)

point

SELECTING CONFIGURATION LEVEL

Press Page

button

“HOME”
display

23.0 23.0

20.020.0

repeatedly
until Access
List appears

1st press

2nd press

ACCSACCS

LiStLiSt

CodECodE

1 1

GotoGoto

conFconF

CodECodE

PASSPASS

If incorrect
password
entered

2 secs

or to enter password
(factory default = 1)

or to select

ConF

If the password has
been set to ‘0’ ­access is
permanently unlocked
& the lower readout
always shows PASS

Note: Selecting

OPER,FuLL,or Edit

will allow direct entry
to these levels at this

3rd press

or to enter
password

At this point the
controller is in

4th press

ConFConF

2 2

ConFConF

PASSPASS

configuration level

inStinSt

ConFConF

iP iP

ConFConF

Repeated pressing of “Page” button selects

configuration list headings in a continuous loop

5-2 CN22166 Controller

Installation and Operation Handbook Configuration

SELECTING A CONFIGURATION PARAMETER (continued from previous

page)

ConFConF

2 2

ConFConF

PASSPASS

1st press

InStInSt

ConFConF

2nd press

UnitUnit

3rd press

Select the desired Configuration List using the
‘Page’ button

See navigation diagram for the full list of
headings

or to select OC,OF,or OK

o o

CC

Continue to press Scroll button to
access all parameters in the list before
returning to List header

LEAVING CONFIGURATION LEVEL

Keep pressing until
Exit display appears

ExitExit

no no

or to select YES
After a 2 second delay the
screen will blank and revert to
the “HOME” display

STEPS INVOLVED IN CONFIGURING A CONTROLLER

The navigation diagram, which follows, shows the general location of parameters, which
define the way in which the controller works. They are grouped under headings.
The actual parameters shown in your controller may differ slightly since some appear
only as a result of selecting others. A full list of possibilities is included in the
PARAMETER TABLES, which follow the navigation diagram.

CN2216 Controller 5-3

Configuration Installation and Operation Handbook

NAVIGATION DIAGRAM (PART A)

Instrument Input User cal. Alarms
Config Config Config Config

inSt
ConF

iP

ConF

CAL

ConF

AL

ConF

Unit

°C

DEc.P

nnnn

CtrL

Pid

Act
rEv

CooL

Lin

PwrF

on

Pd.tr

no

Sbr.t
Sb.OP

InPt

K.tc

CJC

Auto

ImP

Auto

InP.L

4.0

InP.H

20.0

VAL.L

0.0

VAL.H

100.0

AdJ
no

Pnt.L

0.0

Pnt.H

100.0

OFS.L

0.0

OFS.H

0.0

AL1
FSH

Ltch

no

BLoc

no

AL 2

FSL

Ltch

no

BLoc

no

AL 3

OFF

Ltch

no

BLoc

no

AL 4

OFF

SUMMARY

Step through List Headers
using the ‘Page’ button

Choose a parameter from a list
using the ‘Scroll’ button

Change value
using the ‘Raise/Lower’

buttons

Ltch

no

BLoc

no

Fig 5.1a Navigation Diagram (Part A)

5-4 CN22166 Controller

Installation and Operation Handbook Configuration

NAVIGATION DIAGRAM (PART B)

Comms Output 1 Output 2 Output 3 Password
Config Config

HA

ConF

1A
ConF

Config Config Config

2A
ConF

3A
ConF

PASS
ConF

Exit
no

id

cmS

Func
mod

Baud
9600

id

dC.OP

Func
HEAT

SEnS

inv

id

rELY

Func
COOL

SEnS

nor

id

rELY

Func

diG

See

parameter

ACC.P

1

cnF.P
2

tables

PrtY
nonE

RESn

Ful

Out.L

0.0

Out.H

100.0

SEnS

nor

See

parameter

tables

Fig 5.1b Navigation Diagram (Part B)

Heading Input/Output Functions Wiring

The first four headings set up the controller functions as follows:

inSt Conf
iP ConF
CAL ConF
AL ConF

The remaining headings configure the controller input/output functions.
The upper readout corresponds to rear terminal numbers associated with a particular

i/o.

HA Conf
1A Conf
2A ConF
3A Conf
Pass Conf
Exit Conf

Sets up display and control parameters Not applicable
Selects the input sensor type Not applicable
To calibrate to external reference sources Not applicable
Sets up the alarm types Not applicable

Sets up digital comms. type HA to HF
Sets up the output 1 module 1A & 1B
sets up the output 2 module 2A & 2B
Sets up the action of the fixed relay on output 3 3A to 3C
To choose new passwords
To leave configuration level and return to operator level

Terminals

CN2216 Controller 5-5

Configuration Installation and Operation Handbook

CONFIGURATION PARAMETER TABLES

Name Parameter description Values Meaning

inStinSt
unit

dEc.P

CtrL

Act

cooL

PwrF

Pd.tr

Sbr.t

Instrument configuration

Instrument
units

Decimal places in the
displayed value

Control type

Control action

Type of cooling

Power feedback

Bumpless Manual/Auto
transfer when using PD control

Sensor break output

°C
°F
°k

nonE
nnnn
nnn.n
nn.nn
On.OF
Pid
rEv

dir
Lin
oiL
H2O
FAn
on

OFF
no
YES

Sb.OP

HoLd

Centigrade (default UK)
Fahrenheit (default USA)
Kelvin
Display units will be blanked
None
One
Two
On/off control
PID control
Reverse acting (required for

temperature control) - output
decreases on approach to
setpoint.

Direct acting
Linear
Oil (50mS min on time)
Water(non-linear)
Fan (0.5S min on time)
Power feedback is on

(compensates for changes in
supply voltage)

Power feedback is off
Non-bumpless transfer
Bumpless transfer (auto to

manual and manual to auto)
Go to pre-set value (maintains

output at a known, safe level)
Freeze output (maintains

output at value immediately
before break)

NOTE

Factory default parameter values and states are included where applicable and

**

5-6 CN22166 Controller

are indicated by the shaded areas in the tables.

Installation and Operation Handbook Configuration

Input

Name Parameter description Value Meaning

iPiP
inPt

Input configuration

Input type

NOTE:

J.tc
K.tc
L.tc
r.tc
b.tc
n.tc
t.tc
S.tc
PL.2

J thermocouple (default USA)
K thermocouple (default UK)
L thermocouple
R thermocouple (Pt/Pt13%Rh)
B thermocouple (Pt30%Rh/Pt6%Rh)
N thermocouple
T thermocouple
S thermocouple (Pt/Pt10%Rh)
PL 2 thermocouple

rtd 100Ω platinum resistance

thermometer.

After selecting an input
type, do not forget to
adjust the setpoint limits
in Full Access level

C.tc

mV

Custom downloaded input type. The
default is E thermocouple, or the
name of the downloaded custom input
will be displayed.

Linear millivolt (Also mA input via an
external 2.49Ω current sense resistor)

Linear voltage
Automatic cold junction compensation

CJC

CJC ref. temperature

(CJC does not appear for
linear inputs)

voLt
Auto
0°C 0°C external reference
45°C 45°C external reference
50°C 50°C external reference

Linear Input Scaling - The next 4 parameters only appear if a linear input is chosen

inPL

inPH

Displayed Value

VAL.H

Input value low

Input value high

VALL

VALH

ImP

VAL.L

InP.L

Sensor break input
impedance trip level

Electrical

InP.H

OFF

Auto

Displayed reading low

Displayed reading high

Sensor break detection is disabled

Appears for mV or V inputs only

Trip level set by the sensor input table

Hi Trip level set at 7.5KΩ
HiHi Trip level set at 15KΩ (reqd. for i/p

code 8)

CN2216 Controller 5-7

Configuration Installation and Operation Handbook

Name Parameter description Value Meaning

CALCAL
AdJ

Pnt.L

Pnt.H

OFS.L

OFS.H

User calibration config. See Chapter 6 - User calibration

User cal enable

User calibration
point low

User calibration
point high

Low point
calibration offset

High point
calibration offset

User calibration is disabled

no

User calibration is enabled

YES

This is the value (in display units) at which a

0

User last performed a low point calibration
This is the value (in display units) at which a

100

User last performed a high point calibration
Offset, in display units, at the user low

0

calibration point ‘Pnt.L’. This value is
automatically calculated when performing low
point calibration.

Offset, in display units, at the user high

0

calibration point ‘Pnt.H’. This value is
automatically calculated when performing a high
point calibration.

*If User calibration is enabled, then the User calibration parameters will appear in the
Input list of Operator Full access level. See Chapter 6, User calibration.

5-8 CN22166 Controller

Installation and Operation Handbook Configuration

Name Parameter description Values

ALAL

AL1
Ltch
bLoc
AL2
Ltch
bLoc
AL3
Ltch
bLoc
AL4
Ltch
bLoc

Table A: Alarm types

OFF
FSL
FSH
dEv
dHi
dLo

Alarm configuration Values Defaults if not

Alarm 1 Type As table A
Alarm 1 Latching
Alarm 1 Blocking
Alarm 2 Type As table A
Alarm 2 Latching
Alarm 2 Blocking
Alarm 3 Type As table A
Alarm 3 Latching
Alarm 3 Blocking
Alarm 4 Type As table A
Alarm 4 Latching
Alarm 4 Blocking

No alarm
Full scale low
Full scale high
Deviation band
Deviation high
Deviation low

(1)

(1)

(1)

(1)

no/YES no
no/YES no

no/YES no
no/YES no

no/YES no
no/YES no

no/YES no
no/YES no

specified

OFF

OFF

OFF

OFF

(1) Blocking allows the alarm to become active only after it has first entered a safe state.

NOTE

**

These are ‘soft’ alarms i.e. Indication only. They would normally be attached
to an output. See Chapter 7 for a step by step guide.

CN2216 Controller 5-9

Configuration Installation and Operation Handbook

Name Parameter description Functions Meaning

HAHA
id

Comms module config Functions Meaning

Identity of the option installed

PDS.i
cmS

PDLINK setpoint input
RS-485 (EIA 485) comms

module

Func

Function

The following parameters will appear if the RS-485 (EIA 485) option is installed

mod
nonE

Modbus® protocol
None

The following parameters will appear if the PDLINK setpoint input option is installed.

No PDLINK function
PDLINK setpoint input

VAL.L
VAL.H

NonE
SP.iP

PDLINK low input value Range = -999 to 9999
PDLINK high input value Range = -999 to 9999

The following parameters will appear if the function chosen is Modbus protocol.

BAud

Prty

rESn

Baud Rate

Comms Parity

Comms Resolution

1200, 2400, 4800, 9600, 19.20 1920

(19200)

nonE
EvEn
Odd
FuLL
Int

No parity
Even parity
Odd parity
Full resolution
Integer resolution

5-10 CN22166 Controller

Installation and Operation Handbook Configuration

Name Parameter description Function Meaning

1A
id

Output 1 configuration Function Meaning
Identity of module installed

nonE
rELY
dC.OP

No module fitted
Relay output
DC output (non-

isolated)

LoG

dc pulse or
PDLINK output

AC SSR output

Function set by

Func

Function

SSr
nonE
dIG

diG.F

Heating output
Cooling output
PDLINK mode 1

Only appear for id = LoG

HEAt
COOL
SSr.1

heating

and Func = HEAt

SSr.2

PDLINK mode 2
heating

For function = diG go to table B below

SEnS

Sense of output

nor
inv

Normal (e.g. heating and cooling)
Inverted (alarms - de-energise in

alarm)

DC output scaling For id = dC.OP the following parameters appear

Out.L
Out.H

DC output minimum
DC output maximum

0mA to ‘Out.H’
‘Out.L’ to 20mA

Table B The following parameters appear if ‘dIG’ is chosen as the function.
diG.F**

Digital output functions
Any number of the functions

listed can be combined on to
the output.

Use the and
buttons to select a desired
digital function. After two
seconds the display will blink
and return to the ‘no.CH
display. Use the arrows
again to scroll through the
function list. The previously
selected function display will
show two decimal points
indicating that it has been
added to the output.

noCH
CLr

1 - - ­2 - - ­3 - - ­4 - - ­Sbr
Lbr
LdF
mAn
SPAn
rmtF
HtrF
SSrF
LdoP

No change
Clear all existing functions
Alarm 1*
Alarm 2*
Alarm 3*
Alarm 4*
Sensor break
Loop break
PDLINK Load failure
Manual mode
PV out of range
Remote setpoint failure
PDLINK Heater failure
PDLINK Solid state relay failure
PDLINK Load open (Amps<1)

*In place of the dashes, the last three characters indicate the alarm type as per table A in the AL list:
e.g. 1FSL = Full Scale Low. If an alarm is not configured the displayed name will differ: e.g. ‘AL
1’ will be shown, for the first alarm

CN2216 Controller 5-11

Configuration Installation and Operation Handbook

Name Parameter description Function Meaning

2A2A
id

Func

For Func = dIG go to table B below
SenS

Table B The following parameters appear if ‘dIG’ is chosen as the function
diG.F

Output 2 configuration Function Meaning

Identity of module installed

Function

Sense of output

Digital output functions
Any number of the functions

listed can be combined onto
the output.

Use the and buttons
to select a desired digital
function. After two seconds
the display will blink and return
to the ‘no.CH’ display. Use
the arrows again to scroll
through the function list. The
previously selected function
display will show two decimal
points indicating that it has
been added to the o/p

nor
inv

nonE
rELY
LoG
SSr
nonE
dIG Function set by diG.F
HEAt
COOL

Normal (heat and cool outputs)

Inverted (alarms - de-energize in alarm)

noCH
CLr

1 - - ­2 - - ­3 - - ­4 - - ­Sbr
Lbr
LdF
mAN
SPAn
rmtF
HtrF
SSrF
LdoP

No module fitted
Relay output
dc pulse
AC SSR output
none

Heating output
Cooling output

No change
Clear all existing functions
Alarm 1*
Alarm 2*
Alarm 3*
Alarm 4*
Sensor break
Loop break
PDLINK Load failure
Manual mode
PV out of range
Remote setpoint failure
PDLINK Heater failure
PDLINK Solid state relay
failure
PDLINK Load open
(Amps<1)

*In place of the dashes, the last three characters indicate the alarm type: e.g. 1FSL
If alarm not configured displayed name will differ: e.g. ‘AL1 will be shown, for 1st
alarm

3A3A

PASSPASS
ACC.P
cnF.P

ExitExit

5-12 CN22166 Controller

Output 3 configuration As per output 2 configuration

Password list

FuLL or Edit level password
Configuration level Password

Exit Configuration

no YESno YES

Installation and Operation Handbook User Calibration

Chapter 6 USER CALIBRATION

This chapter has five topics:

• WHAT IS THE PURPOSE OF USER CALIBRATION?

• USER CALIBRATION ENABLE

• SINGLE POINT CALIBRATION

• TWO POINT CALIBRATION

• CALIBRATION POINTS AND CALIBRATION OFFSETS

To understand how to select and change parameters in this chapter you will need to have
read Chapter 1 - Operation, Chapter 3- Access Levels and Chapter 5 - Configuration.

WHAT IS THE PURPOSE OF USER CALIBRATION?

The basic calibration of the controller is highly stable and set for life. User calibration
allows you to offset the ‘permanent’ factory calibration to either:

1. Calibrate the controller to your reference standards

2. Match the calibration of the controller to that of a particular transducer or sensor
input

3. Calibrate the controller to suit the characteristics of a particular installation.

User calibration works by introducing zero and span offsets onto the factory set
calibration. The factory set calibration can always be retrieved.

CN2216 Controller 6-1

User Calibration Installation and Operation Handbook

USER CALIBRATION ENABLE

The User calibration facility must first be enabled in configuration level by setting the
parameter ‘AdJ' in the CAL conf list to ‘YES’ This will make the User calibration
parameters appear in Operator ‘FuLL’ level.
Select configuration level as shown in Chapter 5, Configuration

CAL
Conf

Adj
YES

Exit
no

The User calibration configuration List

CALCAL

Press until you reach the ‘CAL conf list

ConfConf

Press the Scroll button until you reach

User calibration enable

Use or to select:

• YES: Calibration enable

• no: Calibration disabled

Press and together to go to the Exit
display

Exit configuration

Use or to select ‘YES’ and return to
Operator level.

6-2 CN2216 Controller

Installation and Operation Handbook User Calibration

SINGLE POINT CALIBRATION

Your controller is calibrated for life against known reference sources during manufacture.
A calibration offset is often used to allow the controller to compensate for sensor and
other system errors. The normal procedure is to set up the system under test against a
known independent reference, as follows:
Set up the process to be calibrated such that the known reference displays the required
value (temperature).
Observe the reading on the controller. If it is different, proceed as follows:

Select ‘FuLL’ Access level as described in Chapter 3

Input list header

IP

LiSt

CAL

USEr

CAL.L

YES

Press until you reach the input list header.

Press Scroll until you reach the ‘CAL’ display

Calibration type

Use or to select either ‘FACt’ or ‘USEr’.
Selecting ‘FACt’ will reinstate the factory calibration and hide

the following User calibration parameters.
Selecting ‘USEr’ will reinstate any previously set User
calibration and make available the User parameters, as follows:

Press the Scroll button

Calibrate low point?

Use or to select ‘YES’
Selecting ‘no’ will hide the next parameter

Press the Scroll button
continued on the next page

CN2216 Controller 6-3

User Calibration Installation and Operation Handbook

Adjust the low point calibration

The controller will display the current measured input value in

AdJ.L

the lower readout.

50.0

Use or to adjust the reading to the reference
source value, if different.
After a two-second delay the display will blink and the reading
will change to the new, calibrated value. You can calibrate at any
point over the entire display range
This is a single point calibration, which applies a fixed offset
over the full display range of the controller.
The calibration is now complete. You can return to the factory
calibration at any time by selecting ‘FACt’ in the CAL display
shown earlier.

Press and together to return to the Home
display

To protect the calibration against unauthorised adjustment return to Operator level and
make sure that the calibration parameters are hidden. Parameters are hidden using the
‘Edit’ facility described in Chapter 3.

TWO POINT CALIBRATION

The previous section described how to perform a single point calibration, which applies a
fixed offset over the full display range of the controller. A two-point calibration is used
to calibrate the controller at two points and apply a straight line between them. Any
readings above or below the two calibration points will be an extension of this straight
line. For this reason it is best to calibrate with the two points as far apart as possible.

Proceed as follows:

1. Decide upon the low and high points at which you wish to calibrate.

2. Perform a single point calibration at the low calibration point in the manner

described above

3. Set the process under calibration such that the known reference displays the required

higher Process Value (temperature) and allow to stabilize.

4. Press the Scroll button to obtain the high calibration point as shown in the following

diagrams.

6-4 CN2216 Controller

Installation and Operation Handbook User Calibration

Calibrate high point?

CAL.H

Use or to select ‘YES’
(Selecting ‘no’ will hide the next parameter)

YES

Press the Scroll button

Adjust the high point calibration

The controller will display the current measured input value in
the lower readout.

AdJ.H

800.0

To protect the calibration against unauthorised adjustment, return to Operator level and
make sure that the calibration parameters are hidden. Parameters are hidden using the
‘Edit’ facility described in Chapter 3.

Use or to adjust the reading to the reference

source value, if different.

After a two-second delay the display will blink and the reading
will change to the new, calibrated value.
The calibration is now complete. You can return to the factory
calibration at any time by selecting ‘FACt’ in the CAL
display shown earlier.

Press and together to return to the Home
display

CALIBRATION POINTS AND CALIBRATION OFFSETS

If you wish to see the points at which the User calibration was performed and the value of
the offsets introduced these are shown in Configuration, under CAL ConF. The
parameters are:

Name Parameter description Meaning

Pnt.L

Pnt.H

OFS.L

OFS.H

CN2216 Controller 6-5

User low calibration point This is the value (in display units) at which

a User last performed an ‘AdJ.L’ (adjust
low calibration).

User high calibration point This is the value (in display units) at which

a User last performed an ‘AdJ.H’ (adjust
high calibration).

Low point calibration offset Offset, in display units, at the user low

calibration point ‘Pnt.L

High point calibration offset Offset, in display units, at the user high

calibration point ‘Pnt.H’.

Installation and Operation Handbook Alarm Operation

Chapter 7 ALARM CONFIGURATION

Definition of Alarms and Events ...................................................... 7-2

Types of Alarms................................................................................. 7-2

Configuring the Four ‘Soft’ Alarms.................................................. 7-4

Attaching an Alarm to a Physical Output........................................ 7-5

Grouping Alarms on a Single Output.............................................. 7-6

Removing Alarms from an Output................................................... 7-6

The CN2216 series controller is capable of very sophisticated alarm strategies and,
although setting up of alarms has already been covered in previous chapters, this section
has been included to enable operators and commissioning engineers to design their own
strategies for optimum plant operation.

CN2216 Controller 7-1

Alarm Operation Installation and Operation Handbook

DEFINITION OF ALARMS AND EVENTS

Alarms are used to alert an operator when a pre-set level or condition has been exceeded.
They are normally used to switch an output - usually a relay - to provide interlocking of
the machine or plant or external audio or visual indication of the condition.

Soft Alarms are indication only within the controller and are not attached to an output
(relay).

Events - can also be alarms - but are generally defined as conditions, which occur as part
of the normal operation of the plant. They do not generally require operator intervention.
An example might be to open/close a vent during a programmer cycle.
Events are referred to as Digital Output Functions in the manual. See pages 5-11 and 5-

12.

For the purposes of the operation of this instrument alarms and events can be considered
the same.

TYPES OF ALARMS

The use of alarms in your controller is extremely versatile.
Up to 4 alarms can be configured and they are found under the Alarm List in Full Access
Mode. Any combination of these 4 alarms can be attached to any one or more outputs.
NOTE: in a PID controller at least one of these outputs is used to maintain the required
temperature of the process and therefore not available for alarm assignment.
Any number of the available “soft” alarms can be combined to operate a single output

Outputs 1 and 2 Are plug in modules.

Conventionally used for control outputs, e.g. Heat and
Cool, but can be used for alarms.

Output 3 Is a fixed relay.

Conventionally used for alarms or events, but can be
used as a control output.

7-2 CN2216 Controller

Installation and Operation Handbook Alarm Operation

There are five process alarm types listed below. Alarm Types are found in configuration
mode under the Alarm Config. List.

ALARMS

Full Scale High The PV exceeds a set high level
Full Scale Low The PV exceeds a set low level
Deviation Band The difference between PV & SP is outside a set band
Deviation High The difference between PV & SP is higher than a set

level
Deviation Low The difference between PV & SP is lower than a set
level

Each alarm can be set to:

Latching Alarm is indicated until acknowledged
Blocking Alarm occurs after it has been through a start up phase
Sense Of Output Relay energized or de-energized in alarm condition

In addition there are nine “digital output functions” used as events or alarms depending
upon the requirements of the process under control:

DIGITAL OUTPUT FUNCTIONS

Sensor Break The input is open circuit
Loop Break controller does not measure a response to an output

change

Load Failure Used with PDLINK partial load failure
Manual Controller in manual mode
PV Out Of Range Process Variable too high or too low
Remote SP Fail No signal measured at the remote set point input

terminals

Heater Fail Used with PDLINK heater open circuit
Solid State Relay Fail Used with PDLINK solid state relay open or short circuit
Load Open Used with PDLINK no connection at the control output

The Sense of the Output can be set to relay energized or de-energized in the alarm
condition for any of the above functions.

CN2216 Controller 7-3

Alarm Operation Installation and Operation Handbook

STEP1 - CONFIGURING THE FOUR ‘SOFT’ ALARMS

Go To Configuration Level
Refer to Chapter 5

Press “PAGE” key
as many times as necessary
to find Alarm Configuration

PassPass

ConFConF

Press “SCROLL” key
to the alarm which needs to
be configured

Press “SCROLL” key
to choose alarm 1 latching
or non-latching

Press “SCROLL” key
to choose alarm 1 blocking

AL AL

ConfConf

AL 1AL 1

DevDev

LtchLtch

nono

bLocbLoc

nono

Alarm Type choices
are

OFF OFF
FSL Full Scale Low
FSH Full Scale High
dEv deviation Band
dHi deviation High
dLo deviation low

Choices Yes/No
press

Choices Yes/No
press

Press “SCROLL” key
to repeat for alarms 2 - 4
and to return to list header

7-4 CN2216 Controller

Installation and Operation Handbook Alarm Operation

STEP 2 - ATTACHING AN ALARM TO A PHYSICAL OUTPUT

This may be necessary if:

1. The instrument has been supplied and-configured or it is required to re-configure

2. Alarm relays are added

Press “PAGE” key
as many times as necessary
to find 3A Configuration

AL 1AL 1

dEv dEv

Press “SCROLL” key
to identification of output
type (this is read only)

Press “SCROLL” key
to diGital output Function

Press “SCROLL” key
to no change

3A3A

Conf Conf

IdId

rELyrELy

FuncFunc

diG diG

DiGFDiGF

nochnoch

DiGFDiGF

3FSH3FSH

Use or
to select diG
Other choices are:

1. Heat

2. COOL

3. nonE

Use or
buttons to select a desired

digital function. e.g. 3FSH
Other choices are shown in
the table overleaf. After two
seconds the display will
blink and return to the
‘noch’ display. Use the
arrows again to scroll
through the function list.
The previously selected
function will show 2 decimal
points indicating that it has
been added to the output.

Use or

SEnSSEnS

Keep pressing “SCROLL”
button to return to list
header

CN2216 Controller 7-5

inv inv

to select:

1. inverted (relay de­energized in alarm)

2. direct (relay energized
in alarm)

Alarm Operation Installation and Operation Handbook

STEP 3 - GROUPING ALARMS ON A SINGLE OUTPUT

In the previous example one alarm condition is allocated to one output relay.

The CN2216 controller allows alarms and events to be grouped on to a single output.
These events are shown in the table below.

notch
CLr

1 - - ­2 - - ­3 - - ­4 - - ­Sbr
Lbr
LdF
mAn
SPAn
rmtF
HtrF
SSrF

LdoP

No change
Clear all existing
functions
Alarm 1*
Alarm 2*
Alarm 3*
Alarm 4*
Sensor break
Loop break
PDLINK Load failure
Manual mode
PV out of range
Remote setpoint failure
PDLINK Heater failure
PDLINK Solid state
relay failure
PDLINK Load open
(Amps<1)

DiGFDiGF

nochnoch

DiGFDiGF

nochnoch

DiGFDiGF

3FSH3FSH

DiGFDiGF

SbrSbr

Press until you reach
the 1stsoft alarm you wish to
attach to an output e.g. 3FSH
The display returns to no
change after 2 sec. accepting
the condition.

Press until you reach
the 2nd soft alarm you wish to
attach to the output e.g. Sbr
The display returns to no
change after 2 sec. accepting
the condition.

Repeat for all alarms to be
attached to the chosen output

Each time you scroll through
the table of alarms note that
two decimal points appear
confirming acceptance that
the particular alarm has been
attached to the output.
i.e. 3F.S.H S.b.r etc.

STEP 4 - REMOVING ALARMS FROM AN OUTPUT

DiGFDiGF

nochnoch

DiGFDiGF

CLrCLr

7-6 CN2216 Controller

Press once to show clear
After 2 sec. the lower readout
reverts to no change clearing all
events from the chosen output.

Installation and Operation Handbook Understanding The Ordering Code

Appendix A
UNDERSTANDING THE ORDERING CODE

To Order (Specify Model Number)

Single Output Models
Model Number Single Output Type

CN2216-R1 1/16 DIN controller, Relay Output
CN2216-F1 1/16 DIN controller, 4-20 mA Output
CN2216-D1 1/16 DIN controller, dc Pulse Output
CN2216-T1 1/16 DIN controller, ac SSR Output
CN2208-R1 1/8 DIN controller, Relay Output
CN2208-F1 1/8 DIN controller, 4-20 mA Output
CN2208-D1 1/8 DIN controller, dc Pulse Output
CN2208-T1 1/8 DIN controller, ac SSR Output
CN2204-R1 1/4 DIN controller, Relay Output
CN2204-F1 1/4 DIN controller, 4-20 mA Output
CN2204-D1 1/4 DIN controller, dc Pulse Output
CN2204-T1 1/4 DIN controller, ac SSR Output

Dual Output Models (Refer to Output Options for Dual output Models)

CN2216-(*)-(**) 1/16 DIN controller, 85 to 264 Vac Power
CN2208-(*)-(**) 1/8 DIN controller, 85 to 264 Vac Power
CN2204-(*)-(**) 1/4 DIN controller, 85 to 264 Vac Power

Ordering Example: CN2204-R1-T2-A2-C4-HC, dual output controller with one relay output,

one ac SSR output, dual alarms, RS-485 (EIA-485) Communications, high current output
voltage.

* Specify Output 1, ** Specify Output 2

CN2216 Controller A-1

Installation Installation and Operation Handbook

Output Options for Dual Output Models

Output
Type

Relay -R1 -R2
0-20 mA, 0-10 Vdc* -F1 N/A
dc Pulse -D1 -D2

Output 1(*)

Order Suffix

Output 2(**)

Order Suffix

ac SSR -T1 -T2

*Note: 0-10 Vdc (when used with supplied shunt resistor)

Alarms and Communication Options

Model Number Description

-A1* Single alarm

-A2* Dual alarm (not available on CN2216)

-C4 2-Wire RS-485 (EIA-485) communications

*Note: One alarm option may be ordered

High Current Output (CN2204 Only)

Model Number Description

-HC High current output

Field Installable Output Modules

Model Number Description

BD2200-R Relay output module
BD2200-D dc Pulse output module
BD2200-T ac SSR output module
BD2200-F Isolated 0-20mA/0-10 V output module
BD2200-HC High current relay output module (CN2204 only)

Accessories

Model Number Description

SSC-TE10S* Solid State Contactor
CNQUENCHARC Noise Suppression Kit, 110-230 Vac

*To order, refer to the SSC-TE10S specification sheet

A-2 CN2216 Controller

Installation and Operation Handbook Understanding The Ordering Code

Notes:

1. PDLINK is a proprietary technique for bi-directional communication over a single

pair of wires. There are several operating modes.

In mode 1 a DC pulse output delivers a power demand signal to a SSC-TE10S solid

state (SSR) relay and the SSR responds with a single load circuit failure message.

In mode 2 a DC pulse output delivers a power demand signal to an SSC-TE10S and

the SSR responds with the ON state rms load current, and two fault messages - SSR
failure or heater circuit failure.

2. Range min and Range max: Enter a numeric value, with a decimal point if

required. Thermocouple and RTD sensor inputs will always display over the full
operating range shown in the sensor input table. The values entered here will act as
low and high setpoint limits. For linear inputs, the values entered are used to scale
the input signal.

CN2216 Controller A-3

Installation and Operation Handbook Safety Information

Appendix B
SAFETY and EMC INFORMATION

This controller is intended for industrial temperature and process control applications
when it will meet the requirements of the European Directives on Safety and EMC. Use
in other applications, or failure to observe the installation instructions of this handbook
may impair safety or EMC. The installer must ensure the safety and EMC of any
particular installation.

Safety

This controller complies with the European Low Voltage Directive 73/23/EEC, amended
by 93/68/EEC, by the application of the safety standard EN 61010.

Electromagnetic compatibility

This controller conforms to the essential protection requirements of the EMC Directive
89/336/EEC, amended by 93/68/EEC, by the application of a Technical Construction
File. This instrument satisfies the general requirements of the industrial environment
defined in EN 50081-2 and EN 50082-2. For more information on product compliance
refer to the Technical Construction File.

GENERAL

The information contained in this manual is subject to change without notice. While
every effort has been made to ensure the accuracy of the information, Omega shall not be
held liable for errors contained herein.

Unpacking and storage

The packaging should contain an instrument mounted in its sleeve, two mounting
brackets for panel installation and this operating book. Certain ranges are supplied with
an input adapter.
If on receipt, the packaging or the instrument is damaged, do not install the product but
contact Omega.
If the instrument is to be stored before use, protect from humidity and dust in an ambient
temperature range of -30oC to +75oC.

SERVICE AND REPAIR

This controller has no user serviceable parts. Contact Omega for repair.

Caution: Charged capacitors

Before removing an instrument from its sleeve, disconnect the supply and wait at least
two minutes to allow capacitors to discharge. It may be convenient to partially withdraw
the instrument from the sleeve, then pause before completing the removal. In any case,
avoid touching the exposed electronics of an instrument when withdrawing it from the
sleeve. Failure to observe these precautions may cause damage to components of the
instrument or some discomfort to the user.

CN2216 Controller B-1

Safety Information Installation and Operation Handbook

Electrostatic discharge precautions

When the controller is removed from its sleeve, some of the exposed electronic
components are vulnerable to damage by electrostatic discharge from someone handling
the controller. To avoid this, before handling the unplugged controller discharge yourself
to ground.

Cleaning

Do not use water or water based products to clean labels or they will become illegible.
Isopropyl alcohol may be used to clean labels. A mild soap solution may be used to
clean other exterior surfaces of the product.

INSTALLATION SAFETY REQUIREMENTS

Safety Symbols

Various symbols are used on the instrument; they have the following meaning:

Caution, (refer to the

!

accompanying documents)

The functional earth connection is not required for safety purposes but to ground RFI filters.

Personnel

Installation must only be carried out by qualified personnel.

Enclosure of live parts

To prevent hands or metal tools touching parts that may be electrically live; the controller
must be installed in an enclosure.

Caution: Live sensors

The dc pulse and PDLINK outputs are electrically connected to the main PV input,
(thermocouple etc.). If the temperature sensor is connected directly to an electrical heating
element then these non-isolated inputs and outputs will also be live. The controller is
designed to operate under these conditions. However you must ensure that this will not
damage other equipment connected to these inputs and outputs and that service personnel do
not touch connections to these i/o while they are live. With a live sensor, all cables
connectors and switches for connecting the sensor and non-isolated inputs and outputs must
be mains rated. The dc output has a 42V functional insulation to PV.

Wiring

It is important to connect the controller in accordance with the wiring data given in this
handbook. Take particular care not to connect AC supplies to the low voltage sensor
input or other low level inputs and outputs. Only use copper conductors for connections,
(except thermocouple). Ensure that the wiring of installations comply with all local
wiring regulations. In the USA use NEC Class 1 wiring methods.

Functional earth
(ground) terminal

B-2 CN2216 Controller

Installation and Operation Handbook Safety Information

Power Isolation

The installation must include a power isolating switch or circuit breaker that disconnects
all current carrying conductors. The device should be mounted in close proximity to the
controller, within easy reach of the operator and marked as the disconnecting device for
the instrument.

Earth leakage current

Due to RFI Filtering there is an earth leakage current of less than 0.5mA. This may affect
the design of an installation of multiple controllers protected by Residual Current Device,
(RCD) or Ground Fault Detector, (GFD) type circuit breakers.

Overcurrent protection

To protect the internal PCB tracking within the controller against excess currents, the AC
power supply to the controller and power outputs must be wired through the fuse or
circuit breaker specified in the technical specification.

Voltage rating

The maximum continuous voltage applied between any connection to ground must not
exceed 264Vac.

The controller should not be wired to a three-phase supply with an unearthed star
connection. Under fault conditions such a supply could rise above 264Vac with respect
to ground and the product would not be safe.

Voltage transients across the power supply connections, and between the power supply
and ground, must not exceed 2.5kV. Where occasional voltage transients over 2.5kV are
expected or measured, the power installation to both the instrument supply and load
circuits should include a transient limiting device.

These units will typically include gas discharge tubes and metal oxide varistors that limit
and control voltage transients on the supply line due to lightning strikes or inductive load
switching. Devices are available in a range of energy ratings and should be selected to
suit conditions at the installation.

Conductive pollution

Electrically conductive pollution must be excluded from the cabinet in which the
controller is mounted. For example, carbon dust is a form of electrically conductive
pollution. To secure a suitable atmosphere, install an air filter to the air intake of the
cabinet. Where condensation is likely, for example at low temperatures, include a
thermostatically controlled heater in the cabinet.

Grounding of the temperature sensor shield

In some installations it is common practice to replace the temperature sensor while the
controller is still powered up. Under these conditions, as additional protection against
electric shock, we recommend that the shield of the temperature sensor be grounded. Do
not rely on grounding through the framework of the machine.

CN2216 Controller B-3

Safety Information Installation and Operation Handbook

Over-temperature protection

When designing any control system it is essential to consider what will happen if any part
of the system should fail. In temperature control applications the primary danger is that
the heating will remain constantly on. Apart from spoiling the product, this could
damage any process machinery being controlled or even cause a fire.

Reasons why the heating might remain constantly on include:

• the temperature sensor becoming detached from the process

• thermocouple wiring becoming short circuit;

• the controller failing with its heating output constantly on

• an external valve or contactor sticking in the heating condition

• the controller setpoint set too high.

Where damage or injury is possible, we recommend fitting a separate over-temperature
protection unit, with an independent temperature sensor, which will isolate the heating
circuit.

Please note that the alarm relays within the controller will not give protection under all
failure conditions.

INSTALLATION REQUIREMENTS FOR EMC

To ensure compliance with the European EMC directive certain installation precautions
are necessary as follows:

• When using relay or AC SSR outputs it may be necessary to fit a filter suitable for

suppressing the conducted emissions. The filter requirements will depend on the type
of load.

• If the unit is used in tabletop equipment, which is plugged into a standard power

socket, then it is likely that compliance to the commercial and light industrial
emissions standard is required. In this case to meet the conducted emissions
requirement, a suitable mains filter should be installed.

• Routing of wires

To minimise the pick-up of electrical noise, the low voltage DC connections and the
sensor input wiring should be routed away from high-current power cables. Where it is
impractical to do this, use shielded cables with the shield grounded at both ends. In
general keep cable lengths to a minimum.

B-4 CN2216 Controller

Installation and Operation Handbook Safety Information

TECHNICAL SPECIFICATION

Environmental ratings

Panel sealing: Instruments are intended to be panel mounted. The rating

of panel sealing is IP65, (EN 60529), or 4X, (NEMA 250).

Operating temperature: 0 to 55oC. Ensure the enclosure provides adequate

ventilation.
Relative humidity: 5 to 95%, non-condensing.
Atmosphere: Not suitable for use above 2000m or in explosive or

corrosive atmospheres.

Equipment ratings

Supply voltage / frequency: 100 to 240Vac -15%, +10% / 48 to 62Hz.
Power consumption: 10Watts maximum.
Relay (isolated): Maximum: 264Vac, 2A resistive. Minimum: 12Vdc, 100mA.
AC SSR output (isolated): 30 to 264Vac. Maximum current: 1A resistive.
High current switch: 30 to 264Vac. Maximum current: 10A resistive. (isolated)

(CN2204)

Leakage current: External ‘snubber’ components are supplied to suppress

voltage spikes on AC SSR and relay contact outputs. The

leakage current through these components is less than 2mA

at 264Vac, 50Hz.
Over current protection: Use a minimum of 0.5mm2 or 16awg wire for plant

connections. External over current protection devices is

required. Use independent fuses for the instrument supply

and each relay or AC SSR output. Suitable fuses are time-

lag, (EN60127, type T) with ratings as follows; Instrument

supply and relay outputs: 2A; AC SSR outputs: 1A, High

current switch: 10A.
Low level i/o: Input and output connections other than AC SSR and relay

are intended for low level signals less than 42V.
dc pulse output: 18V at 24mA.
(non-isolated)

DC output (isolated *): 0 to 20mA (600Ω max), 0 to 10V (500Ω min). (* see

Isolation below)
PDLINK input (isolated): Setpoint input from and holdback to a master PDLINK

controller.
Digital communications: RS-232 (EIA-232) or RS-485 (2-wire EIA-485).

CN2216 Controller B-5

Safety Information Installation and Operation Handbook

Electrical safety

Safety Standard: Meets EN 61010, Installation category II, pollution degree 2.

Voltage transients on any mains power connected to the
instrument must not exceed 2.5kV.
Electrically conductive pollution must be excluded from
the cabinet in which the instrument is mounted.

Isolation: All inputs and outputs have reinforced insulation to provide

protection against electric shock. The DC pulse and
PDLINK outputs are electrically connected to the main PV
input, (thermocouple etc.). The dc output has a 42V
functional insulation to PV.

B-6 CN2216 Controller