Omega Products CN2216 Installation Manual

Page 1
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
Page 2
Page 3
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
Page 4
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
Page 5
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
Page 6
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
Page 7
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
Output
Actual output level %
3rd press
Manual/Auto
Actual state
Page 8
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
Page 9
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.
Page 10
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
Page 11
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.
Page 12
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
Page 13
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
Page 14
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
Page 15
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
Page 16
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
Page 17
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
Page 18
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
Page 19
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
Page 20
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.
Page 21
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
Page 22
Page 23
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
Page 24
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
Page 25
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.
Page 26
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
Page 27
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-
2.49 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
Page 28
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 +100) 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
Page 29
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
Page 30
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
Page 31
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
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
Page 32
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.
Page 33
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 theACCS 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 to2 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.
Page 34
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
Page 35
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
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.
Page 36
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
Page 37
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 ‘tunEand set it toon
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
Page 38
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
Page 39
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
Page 40
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
Page 41
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.
Page 42
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
Page 43
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.
Page 44
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
Page 45
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
Page 46
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
**
are indicated by the shaded areas in the tables.
Page 47
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 100 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 2.49 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 7.5K HiHi Trip level set at 15K (reqd. for i/p
code 8)
Page 48
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.
Page 49
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.
Page 50
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
Page 51
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
Page 52
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
Output 3 configuration As per output 2 configuration
Password list
FuLL or Edit level password Configuration level Password
Exit Configuration
no YESno YES
Page 53
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.
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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
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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
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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
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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’.
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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.
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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
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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.
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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
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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
inv inv
to select:
1. inverted (relay de­energized in alarm)
2. direct (relay energized in alarm)
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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.
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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
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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
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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.
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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.
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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
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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.
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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
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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 (600 max), 0 to 10V (500 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).
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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
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