Eurotherm P304c User Manual

P304c Melt Pressure Controller

User Manual

HA031861/3 Date July 2014

P304c Controller User Manual

P304c Melt Pressure Controller

User Manual Part Number HA031861 Issue 3 Date July 2014

Contents

1.

DESCRIPTION ......................................................................................................................................... 3

1.1 Unpacking Your Controller ........................................................................................................................... 3

1.2 Dimensions ..................................................................................................................................................... 3

1.3 Step 1: Installation ........................................................................................................................................ 4

1.3.1 Panel Mounting the Controller ............................................................................................................................................ 4

1.3.2 Panel Cut Out Size ................................................................................................................................................................. 4

1.4 Order Code .................................................................................................................................................... 5

1.5 Step 2: Wiring ............................................................................................................................................... 6

1.5.1 Rear Terminal Connections .................................................................................................................................................. 6

1.5.2 Block Diagram and Isolation Boundaries ........................................................................................................................... 6

1.5.3 Wire Sizes ................................................................................................................................................................................ 6

1.5.4 Power Supply .......................................................................................................................................................................... 7

1.5.5 Sensor Inputs .......................................................................................................................................................................... 8

1.5.6 Transmitter Power Supply (TPSU) ....................................................................................................................................... 9

1.5.7 Analogue Outputs................................................................................................................................................................ 10

1.5.8 Digital Inputs ......................................................................................................................................................................... 11

1.5.9 Alarms .................................................................................................................................................................................... 12

1.5.10 Modbus Serial Communications .................................................................................................................................. 13

2. SAFETY AND EMC INFORMATION ................................................................................................... 14

3. SWITCH ON .......................................................................................................................................... 15

3.1 Operator Display ......................................................................................................................................... 15

3.1.1 Status Indication ................................................................................................................................................................... 15

3.1.2 Keyboard ............................................................................................................................................................................... 15

3.1.3 Example – To Display Selected Parameters .................................................................................................................... 16

3.2 Open Indication ........................................................................................................................................... 16

3.3 Levels of Operation ..................................................................................................................................... 16

3.4 Level 1 Operation ........................................................................................................................................ 17

3.4.1 Level 1 Parameters ............................................................................................................................................................... 17

3.4.2 Example 1 – To Set Alarm 1 Threshold ............................................................................................................................. 17

3.4.3 Example 2 – To Adjust the Output Level in Manual Mode ............................................................................................ 18

3.5 To Select Other Levels of Operation ......................................................................................................... 18

3.6 Level 2 Operation ........................................................................................................................................ 19

3.6.1 Level 2 Parameters ............................................................................................................................................................... 19

3.7 To Return to Level 1 .................................................................................................................................... 21

3.8 Auto / Manual Mode ................................................................................................................................... 22

3.9 Alarms ........................................................................................................................................................... 23

3.10 Definition of Alarm Types ...................................................................................................................... 23

3.10.1 Process High .................................................................................................................................................................... 23

3.10.2 Process Low ..................................................................................................................................................................... 23

3.10.3 Band High ........................................................................................................................................................................ 24

3.10.4 Band Low .......................................................................................................................................................................... 24

3.10.5 Deviation High ................................................................................................................................................................. 25

3.10.6 Deviation Low .................................................................................................................................................................. 25

3.10.7 Alarm Mask at Start up ................................................................................................................................................... 26

3.10.8 Alarm Mask Reset ........................................................................................................................................................... 26

3.10.9 Alarm Reset Mode .......................................................................................................................................................... 26

3.10.10 Alarm Acknowledgement .............................................................................................................................................. 26

3.10.11 Failsafe mode .................................................................................................................................................................. 26

3.10.12 Threshold ......................................................................................................................................................................... 26

3.10.13 Hysteresis ......................................................................................................................................................................... 26

3.10.14 Alarm Filter ...................................................................................................................................................................... 26

3.10.15 Behaviour of Alarms after a Power Cycle .................................................................................................................... 26

3.11 Pressure Transducer Calibration ........................................................................................................... 27

3.11.1 Calibration of a Pressure Transducer fitted with an internal shunt resistor. .......................................................... 27

3.11.2 Calibration of pressure transducers with an external shunt resistor ...................................................................... 27

3.11.3 Calibration of an amplified pressure transducers with an internal shunt resistor ................................................ 27

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P304c Controller User Manual

3.11.4 Calibration of pressure transducer connected to the secondary input ................................................................. 27

4. CONTROLLER BLOCK DIAGRAM...................................................................................................... 28

5. CONFIGURATION LEVEL ................................................................................................................... 29

5.1 To Select Configuration Level ..................................................................................................................... 29

5.2 Configuration Level Parameters ................................................................................................................. 29

5.3 Configuration - ‘P’ Codes ............................................................................................................................ 30

5.3.1 Summary ................................................................................................................................................................................ 30

5.3.2 Pressure Input Selection ...................................................................................................................................................... 31

5.3.3 Shunt Calibration .................................................................................................................................................................. 31

5.3.4 Pressure Input Display Update Time ................................................................................................................................. 31

5.3.5 Secondary Input.................................................................................................................................................................... 32

5.3.6 Control Output ..................................................................................................................................................................... 33

5.3.7 Retransmission ...................................................................................................................................................................... 34

5.3.8 Alarms .................................................................................................................................................................................... 35

5.3.9 Logic Input ............................................................................................................................................................................. 36

5.3.10 Peak Detection ................................................................................................................................................................ 36

5.3.11 Line Frequency ................................................................................................................................................................ 36

5.3.12 Manual/Auto Start-Up .................................................................................................................................................... 37

5.3.13 Digital Communications ................................................................................................................................................ 38

5.3.14 Pass codes ........................................................................................................................................................................ 39

5.3.15 Recovery Point ................................................................................................................................................................. 39

6. CONTROL ............................................................................................................................................. 40

6.1.1 Control Algorithm ................................................................................................................................................................ 40

6.1.2 Proportional Band ‘PB’ ....................................................................................................................................................... 40

6.1.3 Integral Term ‘Ti’ ................................................................................................................................................................ 41

6.1.4 Derivative Term ‘TD’ ............................................................................................................................................................ 41

6.2 Tuning............................................................................................................................................................ 42

6.2.1 TUNE Function ...................................................................................................................................................................... 42

6.2.2 ADAPTIVE Function ............................................................................................................................................................. 42

6.2.3 Automatic stand-by: ............................................................................................................................................................. 42

6.3 Start up of a Process .................................................................................................................................... 42

7. DIGITAL COMMUNICATIONS ........................................................................................................... 43

7.1 EIA485 Field Communications Port ........................................................................................................... 43

7.2 Modbus/JBus Protocol ................................................................................................................................ 43

8. INSTRUMENT CALIBRATION ............................................................................................................. 44

8.1 To Access Calibration Mode ....................................................................................................................... 44

8.2 Error Codes ................................................................................................................................................... 46

8.3 Example 1: To Calibrate the 0-10V Main Input ...................................................................................... 47

8.4 Example 2: To Calibrate the 0-5V Main Input ......................................................................................... 48

8.5 Example 3: To Calibrate the 0-20mA Main Input ................................................................................... 49

8.6 Example 4: To Calibrate the Control Output (OUT1) - Voltage ............................................................ 50

9. CPI (CONFIGURATION PORT INTERFACE) ..................................................................................... 51

9.1 CPI Adaptor .................................................................................................................................................. 51

9.2 Firmware Update Procedure ...................................................................................................................... 52

10. APPENDIX A MODBUS AND JBUS ADDRESSES .................................................................... 53

10.1 Multiplier and Decimal figures ............................................................................................................... 53

10.2 S2K IEEE floating point notation ........................................................................................................... 53

10.3 Level 1 and Level 2 Parameters ............................................................................................................. 53

11. APPENDIX B TECHNICAL SPECIFICATION ............................................................................ 60

12. INDEX ............................................................................................................................................ 62

Issue status of this Manual

Issue 2 makes minor corrections.

Issue 3 updates strain guage wiring diagram.

2 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

1. Description

P304c is a microprocessor based pressure and process controller based on the Piccolo range of instruments. It is suitable for use on a wide range of processes including the control and indication of extruder melt pressure.

Two process inputs are available which are user configurable for 350Ω strain gauges, voltage or current. A 24Vdc power supply provides the voltage for two or four wire transducers.

Two voltage or mA outputs may be configured for control purposes or for retransmission of process measurements.

Three alarms may be attached to the measured variable to provide indication and interlocks of any out of tolerance condition.

EIA485 3-wire digital communications uses Modbus/Jbus communications. Configuration and commissioning parameters may be set through the front panel keys (protected by different

levels of access).

This manual describes installation, wiring, operation, configuration and calibration of the controller.

1.1 Unpacking Your Controller

The package contains:

• P304c controller mounted in its sleeve

• 2 X Panel securing clips

• Installation sheets in English, French, German and Italian

• Panel sealing gasket

1.2 Dimensions

96mm

(3.78in)

96mm (3.78 in)

128mm (5.04 in)

15mm

(0.59 in)

Part No HA031861 Issue 3 July 14 3

P304c Controller User Manual

1.3 Step 1: Installation

This instrument is intended for permanent installation, for indoor use only, and enclosed in an electrical panel Select a location which is subject to minimum vibrations the ambient temperature is within 0 and 50OC (32 –

122

O

F) and operating humidity of 0 to 85% RH non condensing. The instrument can be mounted on a panel up to 25mm thick. To ensure panel sealing, mount on a non-textured surface. Please read the safety information in section 2 before proceeding. An EMC Booklet, part number HA025464,

gives further installation information and can be downloaded from www.eurotherm.co.uk

.

1.3.1 Panel Mounting the Controller

The instrument can be fitted into a panel up to 25mm thick.

1. Prepare a cut-out in the mounting panel to the size

shown. If a number of instruments are to be mounted in the same panel observe the minimum spacing shown.

2.

Carefully remove the panel retaining clips (3) from the sleeve.

3.

To achieve panel sealing, make sure the gasket (1) is fitted behind the front bezel of the controller

4.

Insert the controller (2) through the cut-out

5.

Fit one panel securing clip to the top of the controller sleeve and the second clip diagonally opposite on the underneath of the sleeve in the slots provided

6.

Tighten the panel securing clips using a screwdriver to a torque of between 0.3 and 0.4 Nm

7.

To remove the controller from its sleeve, ease the latching ears (4) outwards and pull the controller forward out of the sleeve. When refitting ensure that the latching ears click back into place to maintain the panel sealing

1.3.2

Panel Cut Out Size

4.92in

(125mm)

4.92in

(125mm)

Not to scale

Recommended minimum

spacing of instruments

92 mm - 0.0 + 0.8

3.62 in -0.00, +0.03

P304c

92 mm

- 0.0 + 0.8

3.62 in

-0.00, +0.03

(1)

(2)

(3)

(4)

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P304c Controller User Manual

1.4 Order Code

1 2 3 4 5 6

Model Number

Function

Supply Voltage

Second Input

Options

Custom Label

Special

By default the unit is shipped as follows:

• The main input configured for Strain Gauge

• Main Output for voltage control of the process

• Secondary Output (if fitted) as voltage retransmission of the measured variable

• Three alarms. Alarm 1, low with mask at start up. Alarm 2, High. Alarm 3, High.

• Five Digital Inputs. RESET, Alarm + Peak Reset. Digital input 1, Auto/Manual select. Digital input 2, increase

output value. Digital input 3, decrease output value. Digital input 4, set the control output to zero.

The defaults can be reconfigured, see section 5.

Model Number

P304c ¼ DIN controller

2. Power Supply

VH 100 - 230Vac 50 / 60Hz

VL 24Vac / Vdc

3. Second Input

XXX None

RSP Analogue set point or second

PV input (differential pressure)

4. Options

SDXX

24Vdc TPSU + analogue DC retransmission

SD4L

24Vdc TPSU + analogue DC retransmission + RS 485 + 4 dig in

5.

Custom Label

XXXXXX None

6. Special

XXXXXX None

1.

Function

CC Pressure controller

Part No HA031861 Issue 3 July 14 5

P304c Controller User Manual

1.5 Step 2: Wiring

1.5.1 Rear Terminal Connections

1.5.2 Block Diagram and Isolation Boundaries

1.5.3 Wire Sizes

The screw terminals accept wire sizes from 0.5 to 1.5 mm (16 to 22AWG). Hinged covers prevent hands or metal making accidental contact with live wires. The rear terminal screws should be tightened to a torque of between 0.3 and 0.4 Nm

62

63

64

65

66

51

52

53

54

55

NO

C

NC

NO

C

NC

SIG+

SIGCAL2

3 -

4 +

5 +

6 +

7 -

8

10 +

11 -

EXC+

SIG+

SIG-

CAL2

56 +

57 -

58 +

59 -

60

61

45

46

47

48

49

50

12 +

13 -

14

16 +

17 -

18 +

19 +

21 +

22 -

mA VOLT

EXC+

EXCCAL1

RESET

OUT1

mA/V

ALARM2

C

NO

L/24V

N/24V

POWER

SUPPLY

TPSU OUT2

mA/V

A/A’

B/B’

C

EIA485

mA VOLT

Secondary

Input

Primary

Input

ALARM3

EXCCAL1

51

52

53

54

62

63

64

65

66

DIG1

ALARM1

DIG3

DIG2

DIG4

23

24

Reinforced

insulation

boundaries

Insulation

boundaries

TPSU

Power Supply

Main An I/P

Secondary An

I/P

Logic Input

Display

Keyboard

CPU

Modbus

comms

CPI interface

4 x Logic Input

EIA485

Main An O/P

Secondary An

O/P

Alarm 1 O/P

Alarm 2 O/P

Alarm 3 O/P

6 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

The specification given in the following sections are a summary only. For full specifications see section 11.

1.5.4 Power Supply

1. Before connecting the instrument to the power line, make sure that the line voltage corresponds to the

description on the identification label.

2.

Use copper conductors only.

3.

For 24V the polarity is not important

4.

The power supply input is not fuse protected. This should be provided externally

Recommended external fuse ratings are as follows:For 24 V ac/dc, fuse type: T rated 2A 250V For 100-230Vac, fuse type: T rated 2A 250V.

• A switch or circuit breaker must be included in the building installation

• It shall be in close proximity to the equipment and within easy reach of the operator

• It shall be marked as the disconnecting device for the equipment.

Notes: A single switch or circuit breaker can drive more than one instrument.

An earth (ground) connection is not required.

1.5.4.1 High Voltage Power Supply – Order Code VH

• 100 to 230Vac, +15%, 50/60 Hz

• Power rating: 22VA at 50Hz; 27VA at 60Hz.

1.5.4.2 Low Voltage Power Supply – Order Code VL

• 24Vac, (14 to 32Vac) 50/60Hz

• 24Vdc, (14 to 32Vdc) 5% max. ripple voltage

• Power rating: 18VA at 24Vac 50/60Hz; 12W at 24Vdc

• Polarity is not important.

Line

Neutral

53

54

24V

53

54

Part No HA031861 Issue 3 July 14 7

P304c Controller User Manual

1.5.5 Sensor Inputs

Precautions

•

Do not run input wires together with power cables

• When shielded cable is used, it should be grounded at one point only

• These inputs are isolated

1.5.5.1 Pressure Transducer - Primary Input/Secondary Input

1.5.5.2 2 Wire Transmitter

These inputs may be used to measure differential pressure. A typical example measures the pre and post screen pressures in screen changer applications.

1.5.5.3 4 Wire Transmitter

mA-

-

+

4 Wire

4-20mA or

0-20mA

mA+

-

+

Input power for

transmitter

Transmitter power supply TPSU

+

-

3/17

4/18

58

59

Transmitter power supply TPSU

mA-

-

+

2 Wire

4-20mA

mA+

+

-

3/17

4/18

58

59

The diagram shows a pressure transducer with internal calibration resistor.

For transducers without an internal resistor connect an external resistor between terminals

13 and 14 (primary input) or 7 and

8 (secondary input).

The resistor is only switched in when calibrating the transducer. See section 3.11

.

For transducer terminal numbers, refer to the manufacturers data.

CAL2

SIG-

EXC+

Rcal

CAL1

SIG+

10/16

11/17

8/14

7/13

6/12

EXC-

8 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

1.5.5.4 mA - Primary Input/Secondary Input

1.5.5.5 Voltage - Primary Input/Secondary Input

1.5.6 Transmitter Power Supply (TPSU)

17/3

19/5

+

-

• Ranges: 0-5V, 0-10V configurable

Volts

17/3

18/4

+

-

• Ranges: 0-20mA, 4-20mA configurable

• It is not necessary to fit a burden resistor to the mA inputs

since this is connected internally.

mA

58

59

-

+

• 24Vdc +/- 2%, 1.5W optional supply for two or four wire

transmitters

24 V

Part No HA031861 Issue 3 July 14 9

P304c Controller User Manual

1.5.7 Analogue Outputs

Two analogue outputs are provided. OUT1 is used for control and OUT2 is used for retransmission of the measured value.

Both outputs may be configured using the appropriate ‘P’ codes (section 5.3).

1.5.7.1 Control Output (OUT1)

1.5.7.2 Retransmission Output (OUT2)

56

57

+

-

• Opto-isolated from CPU, input and output circuits

• 0/10 VDC min. load 5 kΩ, with under/over-range capability from -2.5 to

12.5 V (default).

• -10/+10 VDC min. load 5 kΩ, with under/over-range capability from -

12.5 to 12.5 V.

• 0/5 VDC min. load 5 kΩ, with under/over-range capability from -1.25 to

6.25 V.

• 0/20 mA max. load 500Ω, with under/over-range capability from -5 to

25 mA (max. load 400Ω over 20 mA).

• 4/20 mA max. load 500Ω, with under/over-

range capability from 0 to 24

mA (max. load 400Ω over 20 mA).

• Resolution: 0.1% of output span.

• Scaling: The retransmission low and high limits are selectable from

0 to pressure input full scale value. The two scaling values may be freely

selectable within the above range, this allow to have a direct or reverse output type.

• Output filter: Selectable: OFF, 0.4, 1, 2, 3, 4, 5 seconds

21

+

-

• Opto-isolated from CPU, input and output circuits

• 0/10 VDC min. load 5 kΩ, with under/over-range capability from -2.5 to

12.5 V (default).

• -10/+10 VDC min. load 5 kΩ, with under/over-range capability from -

12.5 to 12.5 V.

• 0/5 VDC min. load 5 kΩ, with under/over-range capability from -1.25 to

6.25 V.

• 0/20 mA max. load 500Ω, with under/over-range capability from -

5 to 25

mA (max. load 400Ω over 20 mA).

• 4/20 mA max. load 500Ω, with under/over-range capability from 0 to 24

mA (max. load 400Ω over 20 mA).

• Resolution: 0.1% in manual mode, 0.03% in automatic mode.

• Scaling: The output control value may be displayed in two modes:

- from 0.0 to 100.0 % (0.1% resolution)

- from a low to a high limits selectable from -10000 to 10000.

• Output limits: From 0 to 100 % of full scale; no under-range or over-

range is allowed.

• Output filter: Selectable: OFF, 0.4, 1, 2, 3, 4, 5 seconds.

22

10 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

1.5.8 Digital Inputs

• Four optional digital inputs are provided for control purposes plus one for reset purposes.

• The interface circuit is opto-isolated with respect to the CPU, analogue inputs and outputs, but not

isolated with respect to the EIA485 digital communications.

1.5.8.1 Digital Input 1

1.5.8.2 Digital Input 2

1.5.8.3 Digital Input 3

1.5.8.4 Digital Input 4

1.5.8.5 ‘Reset’ Digital Input

• Contact closure (voltage free)

• It may be keyboard programmable for the following functions using

‘P’ code P81:

- alarm reset.

- peak reset.

- alarm and peak reset.

- zero calibration of the primary input.

- zero calibration of the primary input, alarm and peak reset.

• The access to the parameters by frontal keyboard is inhibited while

the zero calibration is running.

• The reset functions (peak and alarm) are level-triggered; it means

reset is active as long as the contact is closed.

• The zero calibration function is edge-

triggered; it means calibration is

started at contact closure.

• Not isolated with respect to analogue inputs.

23

24

• DIG2 is only available when the Auto/Manual selection = CnCt. See

section 3.4.1

• Close the contact to increase the control output value when the

controller is in manual mode

62

64

• DIG3 is only available when the Auto/Manual selection = CnCt.

See section 3.4.1

• Close the contact to decrease the control output value when the

controller is in manual mode

62

65

• This contact is used to switch the controller from automatic to

manual mode setting the control output to zero.

• Close to transfer from manual to automatic mode. The front panel

is inhibited while the user may modify the control output.

• Open to return to automatic mode

62

66

• This conta

ct acts as automatic/manual switch and is only available when

the Auto/Manual selection = CnCt, see sections 3.4.1 and 3.6.1.

• Closed selects manual mode

• Open selects automatic mode

• Note: A dry contact switch or relay must be fitted to enable the use of

Digital Input 2 (DIG2) and Digital Input 3 (DIG3).

62

63

Part No HA031861 Issue 3 July 14 11

P304c Controller User Manual

1.5.9 Alarms

There are three standard alarms. Each alarm is:

• Keyboard programmable using the appropriate ‘P’ codes for:

- Process variable / Deviation / Band

- High / Low / Low masked on start up

- Auto / Manual reset

- Hysteresis - adjustable from 0.1% to 10% of span or one LSD (whichever is the greater)

- Filter: Selectable from OFF, 0.4, 1, 2, 3, 4, 5 seconds.

- By default relays are de-energised when the alarm is active (failsafe). They can be re-configured to be energised in the alarm state see section 3.10.11 ‘Failsafe mode’.

• Varistor protected for spikes protection

1.5.9.1 Alarm 1

1.5.9.2 Alarm 2

1.5.9.3 Alarm 3

• 1 SPDT 2A maximum @240Vac resistive load

45

46

47

NO

C

NC

• 1 SPDT 2A maximum @240Vac resistive load

48

49

50

NO

C

NC

• 1 SPDT solder jumper selectable NO/NC (default NO)

2A maximum @240Vac resistive load

51

52

C

NO

12 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

1.5.10 Modbus Serial Communications

Digital communications uses the Modbus protocol EIA485 2-wire.

 Cable screen should be grounded at one point only to prevent earth loops.

EIA485 Connections

Note:

The device physical interface can only support up to 31 devices for each segment. More than 31 devices will require additional buffering. For more details see the Communications Manual HA026230 which can be downloaded from www.eurotherm.co.uk

.

RxB

TxB

RxA TxA

220Ω

termination

resistor

EIA232/EIA485 2-wire

communications

converter Type KD485

is recommended to convert EIA485 to the EIA232 port on the PC

Daisy Chain to further controllers

220Ω

termination

resistor on

last

instrument in

the line

Twisted pair

Screen

Com

Tx Rx Com

61

60

62

61

60

62

B/B’

A/A’

Common

Tx

Rx

Com

Part No HA031861 Issue 3 July 14 13

P304c Controller User Manual

2. Safety and EMC Information

This instrument is intended for industrial temperature and process control applications within the requirements of the European Directives on Safety and EMC.

Information contained here is subject to change without notice. While every effort has been made to ensure the accuracy of the information, your supplier shall not be held liable for errors contained herein.

Safety and EMC protection can be seriously impaired if the unit is not used in the manner specified. The installer must ensure the safety and EMC of the installation.

This instrument complies with the European Low Voltage Directive 2006/95/EC, by application of safety standard EN 61010.

Unpacking and storage. If on receipt, the packaging or unit is damaged, do not install but contact your supplier. If being stored before use, protect from humidity and dust in an ambient temperature range of -20OC to +70OC.

Electrostatic discharge precautions. Always observe all electrostatic precautions before handling the unit. Service and repair. This instrument has no user serviceable parts. Contact your supplier for repair. Cleaning. Isopropyl alcohol may be used to clean labels. Do not use water or water based products. A mild

soap solution may be used to clean other exterior surfaces. Electromagnetic compatibility. This instrument conforms to the essential protection requirements of the EMC

Directive 2004/108/EC, by the application of a Technical Construction File. It satisfies the general requirements of the industrial environment defined in EN 61326-1.

Caution: Charged capacitors. Before removing an instrument from its sleeve, disconnect the supply and wait at least two minutes to allow capacitors to discharge. Avoid touching the exposed electronics of an instrument when withdrawing it from the sleeve.

Symbols. If symbols are used on the instrument, they have the following meaning:

W Refer to manual. D Risk of electric shock. O Take precautions against static.

- Protected by DOUBLE INSULATION

Installation Category and Pollution Degree. This unit has been designed to conform to EN61010 standard installation category and pollution degree, defined as follows:-

• Installation Category II (CAT II). The rated impulse voltage for equipment on nominal 230V supply is

2500V.

• Measurement Category I (CAT 1). All measurement circuits withstand a 1500Vrated impulse voltage.

• Pollution Degree 2. Normally only non-conductive pollution occurs. However, a temporary

conductivity caused by condensation must be expected.

Personnel. Installation must only be carried out by suitably qualified personnel

Enclosure of Live Parts. To prevent hands or metal tools touching parts that may be electrically live, the unit must be installed in an enclosure

Wiring. It is important to connect the unit in accordance with the data in this sheet. Always use copper cables. Wiring must comply with all local wiring regulations, i.e. UK, the latest IEE wiring regulations, (BS7671), and USA, NEC Class 1 wiring methods.

Voltage rating. The maximum voltage applied to the relay and logic output terminals must not exceed 230Vac +15%. The controller must not be wired to a three phase supply with an unearthed star connection.

Electrically Conductive pollution e.g. carbon dust, MUST be excluded from the unit enclosure. Where necessary, fit an air filter to the air intake of the enclosure. Where condensation is likely, include a thermostatically controlled heater in the enclosure.

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 is grounded. Do not rely on grounding through the framework of the machine.

Installation Requirements for EMC. To comply with European EMC directive certain installation precautions are necessary:-

• General guidance. Refer to EMC Installation Guide, Part no. HA025464.

• Relay outputs. It may be necessary to fit a suitable filter to suppress conducted emissions.

Table top installation. If using a standard power socket, compliance with commercial and light industrial emissions standard is usually required. To comply with conducted emissions standard, a suitable mains filter must be installed.

14 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

3. Switch On

Whenever the controller is switched on (powered up) it will start in a diagnostic mode lasting for a few seconds. The diagnostic display illuminates all bars of each character and every beacon, followed briefly by the firmware version number and the instrument type (P304c).

3.1 Operator Display

The controller then opens in Operator level and a typical view is shown below.

3.1.1 Status Indication

The status beacons shown below are illuminated to show the current status of the system.

3.1.2 Keyboard

The keyboard consists of five push-buttons, labelled as follows:

Auto/Man

Press for more than 1 second to switch between Automatic and Manual mode. Automatic mode means normal closed loop control; Manual means the output can be raised or lowered manually using the or

keys.

PAGE

Press for more than 4 seconds to select the level of operation (see section 3.3) . During parameter modification it is used to scroll back to the previous parameter without storing the parameter changes.

SCROLL

During parameter modification it is used to scroll forward to the next parameter and to store the parameter changes.

Decrement or modify a parameter value. In manual mode it is used to decrement the output value. When pressed for more than 3 seconds in automatic mode it is used to access and to decrease the set point parameter.

Increment or modify a parameter value. In manual mode it is used to increment the output value. When pressed for more than 3 seconds in

automatic mode it is used to access and to increase the set point parameter. When pressed for less than 3 seconds in automatic mode it is used to switch the lower display between set

point value (SP), deviation value (Dev), output value (OP%), output value (RPM) and peak value (Peak) (if this function is enabled).

At power-on the lower display shows the set point value if the automatic mode is selected, or the output value in manual mode

+

To reset the stored peak value and to reset the alarms. This function is disabled when the device is controlled by serial link.

+ or

+

Jump to max or min parameters value when instrument is in manual mode.

+ or

+

Used only at power-up when the instrument detects a parameter error; see the “ERROR CODES” section 8.2.

Note:

Actions which require two or more pushbuttons to be pressed must follow exactly the pushbutton sequence shown.

ALM

Any alarm

active (red)

Alarm 1, 2 or 3

active

Tuning Algorithm

flashing = first step activated

lit = second step activated

Manual

mode

selected

Device

controlled by

serial link

Remote setpoint selected

Tune Man Rem RSP

3 2 1

Units kg/cm

2

, psi, bar, MPa

Measured Value

Selected parameter

The lower display shows a choice of:

SP -

Setpoint

Dev -

Deviation

OP% -

Output power

RPM -

Output value scaled to RPM

Peak -

peak value

Bar Graph - measured variable.

Alar

m setpoint values are displayed as missing o r

present bars.

First segment blinks for pressure lower than zero.

Last segment blinks for pressure greater than full

scale value.

Status indication

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3.1.3 Example – To Display Selected Parameters

Press to select in turn SP, Dev, OP%, RPM, Peak.

These are shown lower display and have the following meanings:

SP

The value of the setpoint is displayed. If Lr.SP in the Level 2 list = Loc, the local setpoint value (which is set by selecting SP in the Level 1

or Level 2 list) is displayed. If Lr.SP in the Level 2 list = reN, the setpoint value is derived from an external mA/voltage source

connected to terminals 3 and 4/5. The display also shows RSP in the bottom right hand corner. Note: this assumes that the secondary input is fitted and configured accordingly, see ‘P’ codes P11

to P24, section 5.3.

Dev

This is the difference between the setpoint and the measured value, i.e. deviation (or error).

OP%

This is the current output power level demand in % of the control output.

RPM

This is the speed of the drive in an extruder application

Peak

The peak value that the measured variable has achieved between start of the process (instrument powered up) and a reset.

3.2 Open Indication

If the error message "OPEn" is displayed it is due to one or more of the following conditions:

• A/D converter saturation

• input current lower then 0.8 mA (for 4-20 mA inputs)

• pressure input lower than -25% or higher than 125% of full scale value

• "+SIG" or "-SIG" unconnected wire for strain gauge input

• remote set point input lower than -1% or higher than 101% of full scale value

3.3 Levels of Operation

There are three levels of operation.

• Level 1 LEv1

This is designed for day to day operation so access to

these parameters is not

protected by a passcode.

• Level 2 LEv2

Parameters available in level 1 are also available in level 2. Level 2 contains a full set of parameters for commissioning purposes and more detailed operation. Level 2 can be protected by a passcode.

• Configuration

ConF

Configuration level sets all features of the instrument and is carried out using a list of ‘P’ codes. Each P code is associated with a particular feature of the instrument such as Input Type, Ranging, Outputs, Alarms, Digital Communications, etc. Configuration level can be protected by a passcode.

When Configuration level has been entered, two further levels may be selected as follows:-

Press and hold the button again for about 4 seconds until the Goto message is shown. Then press the or

button to select the Instrument Calibration level:-

• Instrument

calibration ICAL

The instrument is supplied with all fitted circuits fully calibrated. Furthermore field

fitted circuits do not require calibration since these boards are shipped from the factory full calibrated. However, this level is available to allow input and output circuits to be field calibrated if necessary. See section

8 for details.

When the desired level is selected press

button to confirm and to enter the level.

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3.4 Level 1 Operation

At switch on the instrument enters Level 1.

Press to scroll through a list of parameters available in this level. Press

or to adjust an analogue value or a digital enumeration, provided that the parameter is not read

only or has been locked in other levels.

3.4.1 Level 1 Parameters

For day to day operation the following list of parameters are available (depending on configuration).

Mnemonic

(shown in the lower display)

Name

Availability Explanation

SP

SETPOINT Always Range SP.LO to SP.Hi. (set in Level 2)

AL.NAS

ALARMS MASK RESET

Only if one or more alarms are configured with mask at start up

Use

or to switch the upper display from OFF

to rESEt, then press to restore the alarm mask. See section 3.10.8.

A-N

AUTO/MANUAL SELECTION

Only if the external keyboard is fitted

Select LoCAL for front button operation. Select CnCt for external control. This may be

selected by the Digital inputs on terminals 62 to 66 Default = LoCaL

AL1

ALARM 1 THRESHOLD

Only if P61 ≠ OFF Used to set the point at which the alarm operates.

Range from 0 to pressure input full scale value for process and band alarm.

From - pressure input to + pressure input full scale values for deviation alarm.

The high limit may be expanded to 110% of span. All three alarms are configured by default and are set

to - AL1 5%, AL2 60%, AL3 80% of range. They can be disabled in configuration level.

AL2

ALARM 2 THRESHOLD

Only if P65 ≠ OFF

AL3

ALARM 3 THRESHOLD

Only if P69 ≠ OFF

Pi.vAL

PRIMARY PRESSURE INPUT VALUE

Only if P11 ≠ OFF and P12 = diff.P

This is read only and indicates the pressure measured if the transducer is connected to the primary input terminals.

Si.vAL

SECONDARY PRESSURE INPUT VALUE

This is read only and indicates the pressure measured if the transducer is connected to the secondary input terminals.

3.4.2 Example 1 – To Set Alarm 1 Threshold

Press

until AL1 is displayed

The current alarm level is shown in the upper (green) display.

Press to raise the alarm value

Press

to lower the alarm value

Alarm 2 and Alarm 3 can be adjusted in a similar way.

Press to confirm the new value. The marker bar in the bar graph will also move to the new position.

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3.4.3 Example 2 – To Adjust the Output Level in Manual Mode

The output voltage or current can be raised or lowered manually. See also section 3.8.

Select Manual Mode. This can be done in one of two ways:

1. With the parameter AUTO/MANUAL SELECTION, A-N, set to LoCAL, press the

Auto

Man

button on the front

panel to select Manual operation. This button toggles between Auto and Manual.

The Man beacon will be shown. The lower display will indicate the current power level from 0.0 to 100.0%.

Press or to raise or lower the output level.

2. With the parameter AUTO/MANUAL SELECTION, A-N, set to CnCt, Manual can be selected by closing an

external contact connected to Digital Input 1 (terminals 62 and 63).

The Man beacon will be shown. The lower display will indicate the current power level from 0.0 to 100.0%. Close a contact connected to Digital Input 2 (terminals 62 and 64) to raise the power level. Close a contact connected to Digital Input 3 (terminals 62 and 65) to lower the power level.

The actual voltage or current output on terminals 21 and 22 is adjusted continuously while the raise or lower button is pressed.

Note: P code P87 affects the transfer from manual to auto mode.

If P87 is set to bUNPL (bumpless), the switch from manual to auto does not affect the control setpoint. The controller initially keeps the output value and then the control algorithm acts on the output value in order to control the process automatically.

If P87 is set to SP the switch from manual to auto causes the control setpoint to assume the current process value. The control algorithm then takes over to maintain control at this new setpoint. This is used when the operator – using manual mode – drives the process to a desired level before switching the controller to auto mode to maintain this value. It is typically used for fast processes such as pressure control and for setting up an extruder. It is not useful for slow processes such as temperature control.

Warning: Care must be taken using Manual mode to ensure that the output level remains within the limits of the

process.

3.5 To Select Other Levels of Operation

To change the operating mode, follow the steps below:

1. Press and hold until the lower display shows “GoTo” in the lower display (approximately 4 seconds)

2. Press or to select the desired operating level on the upper display:

LEv1 Normal operative mode Level 1 LEv2 Normal operative mode Level 2 ConF Configuration level

3. Confirm the choice by pressing

.

4. Enter the passcode (if configured) using or LEv2 default = 2. Conf default = 4.

5. Press to accept the value. If passcodes are not configured the selected level will be entered at 3

above.

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3.6 Level 2 Operation

Level 2 parameters also include Level 1 parameters.

To select a parameter:-

Press

to scroll through a list of parameters.

Press or to adjust an analogue value or a digital enumeration, provided that the parameter is not read only or has been locked in configuration level.

3.6.1 Level 2 Parameters

Mnemonic

Shown in the lower display

Parameter Availability Notes Further

Information

SP

SETPOINT Always Range SP.LO to SP.Hi.

AL.NAS

ALARMS MASK RESET Only if one or

more alarms are configured with mask at start up

Use or to switch the upper display from OFF to rESEt, then

press to restore the alarm mask.

Section 3.10.8

A-N

AUTO/MANUAL SELECTION Only if the

external keyboard is fitted

Select LoCAL for front button operation.

Select CnCt for external control. This may be selected by the Digital inputs on terminals 62 to 66 Default = LoCaL

Auto/Manual mode is described in section 3.8

Lr.SP

LOCAL/REMOTE SET POINT SELECTION

If P12 = rSP

This shows the status of the local/remote setpoint selection.

LOC – the setpoint is adjusted using the front panel buttons

or

rEN – the setpoint is adjusted externally. The last selection is restored at power up.

Default = LoC

‘P’ code P12 section 5.3.5

SP.Lo

SET POINT LIMIT LOW Always Prevents the setpoint from being set too low in Operator level 1.

Range 0 to SP.Hi Default = 0

SP.Hi

SET POINT LIMIT HIGH Always Prevents the setpoint from being set too high in Operator level

1. Range SP.Lo to P3 Default = P3

SP.rr

SET POINT RAMP Always This parameter is used to limit the rate of change of the local set

point. It is active also when switching from local to remote set point and vice versa. When the ramp value meets the remote set point input signal, the ramp function is disabled to allow the controller set point to match exactly the analogue input.

Range from 1 to 999 engineering units per second (with a resolution multiplier according to Full Scale Value) and then OFF (step change).

Default = OFF.

AL1

ALARM 1 THRESHOLD If P61 ≠ OFF Used to set the point at which the alarm

operates. Range from 0 to pressure input full scale

value for process and band alarm. From - pressure input to + pressure input

full scale values for deviation alarm. The high limit may be expanded to 110%

of span. Default AL1 5%, AL2 60%, AL3 80% of

range.

Section 3.9

A1.HS

ALARM 1 HYSTERESIS If P61 ≠ OFF Range 0.1 to 10.0%. Default = 1.0.

AL2

ALARM 2 THRESHOLD If P65 ≠ OFF See AL1

A2.HS

ALARM 2 HYSTERESIS If P65 ≠ OFF Range 0.1 to 10.0%. Default = 1.0.

AL3

ALARM 3 THRESHOLD If P69 ≠ OFF See AL1

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Mnemonic

Shown in the lower display

Parameter Availability Notes Further

Information

A3.HS

ALARM 3 HYSTERESIS If P69 ≠ OFF Range 0.1 to 10.0%. Default = 1.0.

Pi.vAL

PRIMARY PRESSURE INPUT VALUE

Only if P11 ≠ OFF

and

P12 = diff.P

See ‘Level 1 Parameters’

Si.vAL

SECONARY PRESSURE INPUT VALUE

Lo.C

ZERO CALIBRATION Always

Use

or to switch upper display

from OFF to On.

Then press

to start the calibration.

It is also possible to select CLEAr to delete field calibration and restore factory calibration.

Default: Zero calibration: 0

Span calibration: Full scale for linear input;

33.3mV for strain gauge.

See also section

3.11

Lo.2.C

ZERO CALIBRATION FOR SECONDARY INPUT

If P11 ≠ OFF & P12 =

diff.P

Hi.C

SPAN CALIBRATION Always

Hi.2.C

SPAN CALIBRATION FOR SECONDARY INPUT

If P11 ≠ OFF & P12 =

diff.P

tUne

TUNE Always In manual mode start the TUNE algorithm.

In auto it enables the ADAPTIVE function. Default = OFF

See section 6.2

Pb

PROPORTIONAL BAND Always Range 1 to 10000%. Default 100.

Ti

INTEGRAL TIME Always Range 0.1 to 99.9s. Default = 5.0.

Td

DERIVATIVE TIME Always Range 0.0 to 99.9s. Default = 0.0.

iP

INTEGRAL PRE LOAD Always Range 0.0 to 100%. Default = 50.0.

oP.Hi

CONTROL OUTPUT LIMITER Always Range 10.0 to 100.0. Default = 100.0.

Ctr.t

TYPE OF CONTROL Always PI or PID. Default = PI.

Ctr.FL

FILTER FOR DISPLAY AND CONTROLLER

Always Range OFF, 0.5, 1, 2, 4, 8, 16 sec.

Default = 1 sec.

ASb

AUTOMATIC STAND-BY Always Range On or OFF. Default = OFF

ASb.PL

AUTOMATIC STAND-BY PRESSURE LOW LIMIT

If ASb = On

Range 0 to 15%. Default = 5%.

ASb.rT

AUTOMATIC STAND-BY RECOVERY TIME

If ASb = On

Range 0 to 60 then

OFF (output is frozen).

A1.FL

ALARM 1 FILTER If P61 ≠ OFF Time constant of the alarm filter

Range OFF, 0.4, 1, 2, 3, 4, 5 sec. Default = 0.4 second

A2.FL

ALARM 2 FILTER If P65 ≠ OFF

A3.FL

ALARM 3 FILTER If P69 ≠ OFF

ro.FL

RETRANSMISSION OUTPUT FILTER

If P55 ≠ OFF Shown when

starting tune in manual mode

Time constant of the retransmission output filter

Range OFF, 0.4, 1, 2, 3, 4, 5 sec. Default = 0.4 seconds

At.t

TIME OF TUNE FUNCTION During the automatic calculation of the filter time constant

the upper display shows the time constant selected by the algorithm.

During the process analysis the upper display shows the elapsed time from the step change; the time format is mmm.ss (minutes and seconds). The maximum time is 500 minutes after which auto tuning will be disabled.

These parameters apply when the TUnE function is active.

See section 6.2 for further details.

At.StP

STEP FOR TUNE FUNCTION Value of the step change used by the auto tuning function

to estimate the process parameters. Default value = 10.0%

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At.iP

AUTOMATIC SELECTION OF THE INTEGRAL PRE LOAD VALUE

Setting this parameter to Auto causes the controller to calculate the integral pre load value using the set point and process gain values.

The process gain value is estimated during the auto tuning function, then the automatic calculation of the integral pre load value is reliable only after a tuning trial.

In Auto the integral pre load value may be read but not modified by the front push-buttons.

Setting this parameter to Nan (manual) causes the controller to reload the former keyboard selected integral pre load value.

Default value = Nan (manual)

At.AFL

AUTOMATIC SELECTION OF THE FILTER TIME CONSTANT

Setting this parameter to Auto causes the tuning function to perform a search for the best filter time constant before applying the power change.

The ‘Tune’ beacon will flash at a fast rate while the device is searching for the best time constant.

Default value = Nan (manual)

At.t0

PROCESS TIME DELAY Read-only value of the process time delay as estimated by

tuning function. Default is not applicable. The display shows zero until the

first tune trial.

At.Pt

PROCESS TIME CONSTANT Read-only value of the process time constant as estimated

by tuning function. Default is not applicable. The display show zero until the

first tune trial.

At.PG

PROCESS GAIN Read-only value of the process gain as estimated by the

tuning function. The value is stored in non volatile memory because it is

used in automatic compute of the integral pre load value. Default value = 1.00

At.t1

START TIME OF TUNE FUNCTION

This read-only value is displayed when the tuning function is started to collect data for transient response analysis.

Default is not applicable. The display shows zero until the first tune trial.

At.t2

STOP TIME OF TUNE FUNCTION

This read-only value is displayed when the auto tuning function has finished to collect data for transient response analysis.

Default is not applicable. The display shows zero until the first tune trial.

At.AdS

ADAPTIVE STEP This read-only value shows the internal step number used

by the adaptive algorithm.



‘P’ codes are found in section 5.2.

3.7 To Return to Level 1

1. Press and hold until the lower display shows “GoTo” in the lower display (approximately 4 seconds)

2. Press

or to select LEv1

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3.8 Auto / Manual Mode

Auto mode is the normal operation where the output is adjusted automatically by the controller in response to

changes in the measured value (pressure).

In Auto mode all the alarms and the other functions are operational.

Manual mode means that the controller output power is manually set by the operator. The input sensor is still connected and reading the temperature but the control loop is ‘open’.

In Manual mode all the alarms are operational.

In manual mode the ‘Man’ indication is lit.

The power output can be continuously increased or decreased using the or buttons or from external contact inputs if configured.

In an extruder melt pressure control application it is usual to start the extruder in manual mode and to bring the process to stable conditions before switching to automatic when the controller will ramp to setpoint in a controlled manner.

It is strongly recommended not to start this type of motor speed process in automatic mode. However, in some other non motor control processes automatic start up is desirable. It is the responsibility of the user to determine which is desirable for the process under control.

 The transfer from Auto to manual mode may be chosen as ‘bumpless’ or setpoint (‘P’ code P87).

The default is bumpless (bUNPL) which means the output will remain at the current value at the point of transfer. If setpoint (SP) is selected the current setpoint is used when changing from manual to auto and the process is

maintained at this level by the PID algorithm. See also the example in section 3.4.3

In Level 2, the Auto/Manual function can be controlled from the front panel buttons by selecting LoCAL or through an external keyboard by selecting CnCt.

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3.9 Alarms

Alarms are used to alert an operator when a pre-set level has been exceeded. The threshold value can be set

in Level 1 (or 2) by the alarm setpoint parameters AL1, AL2 or AL3.

They are indicated by lighting the alarm number

1

, etc. and the red

ALM

beacon in the display.

Alarm 1 operates the change-over relay connected to terminals 45, 46 and 47. Alarm 2 operates the change-over relay connected to terminals 48, 49 and 50. Alarm 3 operates the normally closed relay connected to terminals 51 and 52. The alarm relays may be energised or de-energised in alarm as set by the Fail Safe mode described below.

Each alarm can be configured using ‘P’ codes as follows:-

• Off / Process / Deviation / Band

(P61 - Alarm 1; P65 - Alarm 2; P69 - Alarm 3)

• High / Low / Low inhibited on start up

(P62 - Alarm 1; P66 - Alarm 2; P70 - Alarm 3)

• Auto / Latching

(P63 - Alarm 1; P67 - Alarm 2; P71 - Alarm 3)

3.10 Definition of Alarm Types

Alarm types are configured using two parameters, e.g. P61 and P62 for Alarm 1 as shown in the table above. Alarm types are illustrated using examples in the sections below.

3.10.1 Process High

An alarm will activate if the measured value exceeds an absolute high value set by the alarm threshold. The alarm will reset when the measured value falls below the value set by the hysteresis parameter. Example: Alarm 1 = Process high (set by P61 and P62). Controller input range = 3000psi (set by P3). Alarm threshold = 2000psi, set in Level 2 by AL1. (Note:

the alarm threshold can be set between 0 and 3300). Alarm hysteresis = 1.0% of controller input range i.e.

30psi. The alarm will activate when the input level rises above

2000psi. The alarm will de-activate when the input level drops

below 1970psi. This is shown graphically for a rising and falling input

signal (and assumes the alarm is not a latching type).

3.10.2 Process Low

An alarm will activate if the measured value exceeds an absolute low value set by the alarm threshold. Example: Alarm 1 = Process low (set by P61 and P62). Controller input range = 3000psi (set by P3). Alarm threshold = 700psi, set in Level 2 by AL1. (Note:

the alarm threshold can be set between 0 and 3300). Alarm hysteresis = 1.0% of controller input range i.e.

30psi. The alarm will activate when the input level falls below

700psi. The alarm will de-activate when the input level rises

above 730psi. This is shown graphically for a rising and falling input

signal (and assumes the alarm is not a latching type).

Alarm threshold 700

Alarm

activated

Alarm hysteresis 730

Alarm deactivated

Alarm threshold 2000

Alarm

activated

Alarm hysteresis 1970

Alarm deactivated

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3.10.3 Band High

This alarm is used to indicate when the PV is outside the normal working high and low range.

Example: Alarm 1 = Band High (bAnd set by P61 and HI set by

P62). Controller input range = 3000psi (set by P3). Alarm threshold (AL1) = 500psi (Note: the alarm

threshold can be set between 0 and 3300). Alarm hysteresis (A1.HS) = 1.0% of controller input

range i.e. 30psi. The alarm will activate when the input level rises above

2500psi (SP + AL1). The alarm will de-activate when the input level drops

below 2470psi (SP + AL1 - A1.HS). The alarm will activate when the input level falls below

1500psi (SP - AL1). The alarm will de-activate when the input level rises

above 1530 (SP - AL1 + A1.HS).

This is shown graphically for a rising and falling input signal (and assumes the alarm is not a latching type).

3.10.4 Band Low

This alarm is used to indicate when the PV is inside the normal working high and low range. Example: Alarm 1 = Band Low (bAnd set by P61 and Lo set by

P62). Controller input range = 3000psi (set by P3). Alarm threshold (AL1) = 500psi (Note: the alarm

threshold can be set between 0 and 3300). Alarm hysteresis (A1.HS) = 1.0% of controller input

range i.e. 30psi. The alarm will activate when the input level rises above

1500psi (SP - AL1). The alarm will de-activate when the input level rises

above 2530 (SP + AL1 + A1.HS). The alarm will activate when the input level falls below

2500psi (SP + AL1). The alarm will de-activate when the input level falls

below 1470 (SP - AL1 + A1.HS).

This is shown graphically for a rising and falling input signal (and assumes the alarm is not a latching type).

Alarm activated

A1.HS

Alarm de-activated

Setpoint 2000

PV = 2500

PV = 2470

PV = 1530

PV = 1500

A1.HS

Alarm activated

A1.HS

Alarm de-activated

Setpoint 2000

PV = 2530

PV = 2500

PV = 1500

PV = 1470

A1.HS

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3.10.5 Deviation High

The controller will indicate an alarm if the error value exceeds a high limit set by the alarm threshold. Example: Alarm 1 = Deviation High (dEv set by P61 and HI set by

P62). Controller input range = 3000psi (set by P3). Alarm threshold (AL1) = 500psi (Note: the alarm

threshold can be set between -3000 and 3300). Alarm hysteresis (A1.HS) = 1.0% of controller input

range i.e. 30psi. The alarm will activate when the input level rises above

2500psi (SP + AL1). The alarm will de-activate when the input level drops

below 2470psi (SP + AL1 - A1.HS). This is shown graphically for a rising and falling input

signal (and assumes the alarm is not a latching type).

3.10.6 Deviation Low

The controller will indicate an alarm if the error value is within a low limit set by the alarm threshold. Example: The example is the same as the above. The alarm will activate when the input level is below

2500psi (SP + AL1). The alarm will de-activate when the input level rises

above 2530psi (SP + AL1 + A1.HS). This is shown graphically for a rising and falling input

signal (and assumes the alarm is not a latching type).

Alarm de-activated

Alarm activated

A1.HS

Alarm de-activated

Setpoint 2000

PV = 2500

PV = 2470

Alarm activated

A1.HS

Setpoint 2000

PV = 2530

PV = 2500

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3.10.7 Alarm Mask at Start up

Alarm mask at start up is used to inhibit the activation of an alarm during start up of the process. When the process has reached steady state conditions and has achieved the safe state defined by the alarm threshold the mask is removed. Only then will an alarm be triggered if the process exceeds the threshold.

3.10.8 Alarm Mask Reset

The alarm mask may be restored using the keyboard parameter (AL.NAS) available in Levels 1 & 2. Moreover the alarm mask of deviation and band alarms is restored at set point change and during set point ramp.

3.10.9 Alarm Reset Mode

This can be set using ‘P‘ code P63, P67 or P71 as Auto or Latching. An auto alarm does not require acknowledgement. The alarm is no longer active as soon as the alarm condition

is removed. A latching alarm continues to be active until both the alarm condition is removed AND the alarm is

acknowledged. The acknowledgement can only occur AFTER the condition causing the alarm is removed.

3.10.10 Alarm Acknowledgement

An alarm may be acknowledged by closing an external contact on the RESET input on terminals 23 and 24 – normally an external pushbutton.

3.10.11 Failsafe mode See ‘P’ codes P64 - Alarm 1; P68 - Alarm 2; P72 - Alarm - 3. Failsafe - relay coil energized in no alarm condition. This means that if power is removed from the controller the

relay will relax to indicate an alarm state, assuming, of course, that power remains on to the external alarm circuitry.

Non-failsafe - relay coil energized in alarm condition. The default condition is failsafe.

3.10.12 Threshold

This is the value at which the alarm is to operate and may be set in Levels 1 & 2. Range is from 0 to 110% Full Scale (the threshold may be limited due to the selected full scale value).

3.10.13 Hysteresis

Hysteresis is the difference between the point at which the alarm switches ‘ON’ and the point at which it switches ‘OFF’. It is used to provide a definite indication of the alarm condition and to prevent alarm relay chatter. It is particularly useful in conditions where the PV is noisy. Hysteresis set for each alarm in Level 2 from

0.1% to 10.0% of span or 1 Least Significant Digit (whichever is greater).

3.10.14 Alarm Filter

A time constant can be added to an alarm to prevent spurious switching in the event of a noisy input signal. It is available in Level 2 for each alarm and is selectable from: OFF, 0.4s, 1s, 2s, 3s, 4s, 5s.

3.10.15 Behaviour of Alarms after a Power Cycle

If an alarm is active when the power is switched off and is still active when the power is restored the alarm condition will be detected.

If an alarm is active when the power is switched off and is no longer active when the power is restored no alarm will be detected.

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3.11 Pressure Transducer Calibration

This section describes how to calibrate the instrument to the particular pressure transducer being used. The instrument should be powered up for at least 15 minutes and allow the transducer to reach operating conditions.

3.11.1 Calibration of a Pressure Transducer fitted with an internal shunt resistor.

Assume the transducer, with no load, is connected to the Primary Input. If the controller has not been configured then carry out the following steps in Configuration Level. If it has been configured then calibration is performed as described below in Level 2.

Configure the controller

In configuration level set the relevant ‘P’ codes for the transducer being calibrated, for example: P1 = Str P2 = pressure units, e.g. psi P3 = full scale range of the strain gauge, e.g. 10000 psi P4 = the minimum scale range of the strain gauge, e.g. 0 psi P5 = the required decimal point position P6 = As selected - usually high P7 = On. Shunt calibration enabled, if the pressure transducer is fitted with an internal shunt resistor. P8 = the correct percentage (80% for a typical transducer).

In Level 2

1. Open the calibration switch (if fitted)

2. Select Lo.C (low calibration for the primary input). Ensure

that no pressure is applied to the transducer.

3. Use

or to switch upper display from OFF to On.

4. Then press

to start the low calibration.

5. The instrument calibrates to zero pressure.

6. Close the calibration switch

7. Select Hi.C (span calibration for the primary input. Note

this is normally 80% of span but can be changed by P8 to suit a specific transducer.)

8. Use

or to switch upper display from OFF to On.

9. Then press

to start the calibration.

10. The instrument calibrates to 80% of its span

3.11.2 Calibration of pressure transducers with an external shunt resistor

Connect the external shunt resistor (value as specified by the transducer manufacturer) across terminals 13/14 . Ensure that the full scale and low scale values have been set to match the range of the transducer, the Shunt

function is On and P8 is set to the correct percentage as listed above. In Level 2, repeat steps 1 to 8 above.

Note: The transducer may also be connected to the secondary input using terminals 6 to 11.

3.11.3 Calibration of an amplified pressure transducers with an internal shunt resistor

In configuration level ensure that P7 is set to OFF, then repeat steps 1 to 8 above.

3.11.4 Calibration of pressure transducer connected to the secondary input

This is the same as above but in Level 2 use the Lo.2.C (zero calibration) and Hi.2.C (Span calibration) parameters instead of Lo.C and Hi.C.

CAL2

SIG-

EXC+

Rcal

CAL1

SIG+

16

17

14

13

12

EXC-

* Calibration

switch (optional)

*

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4. Controller Block Diagram

The block diagram shows the function blocks which make up the controller. Where applicable, each block is represented by the ‘P’ code as described in the section 5.

The pressure is measured by the pressure transducer which can be connected to either the Primary or Secondary Inputs. The measurement is compared with a Setpoint (SP) set by the user. The measured analogue value can be retransmitted using output 2 (OUT2).

The purpose of the control block is to reduce the difference between SP and PV (the error signal) to zero by providing a compensating output to the plant via the output block 1 (OUT1).

The three alarms blocks monitor the measured pressure and can be configured to respond to high, low, band or deviation alarms and operate relay outputs.

EIA485 digital communications provides an interface for data collection, monitoring and remote control.

The way in which each block performs is defined by its internal parameters. Some of these parameters are available to the user so that they can be adjusted to suit the characteristics of the process which is to be controlled.

These parameters are found in lists in Operator Level 1, Operator Level 2 and Configuration level (‘P’ codes shown in the following section).

Transducer

supply 24Vdc

Alarm 1 Relay

Output

Control Output

(OUT1)

P35 to P40

Pressure

Sensor

To plant

actuator devices

Primary

Input

P1 to P6

Setpoint

Control

PID/Tune/Auto-

Man

Retransmission

Output (OUT2)

P55 to P57

Alarm 1

P61 to P64

To pressure

Transducer

Digital Inputs

1 to 4

Inputs

Processes

Outputs

Logic Input

P81 and P82

Secondary

Input

P11 to P24

Alarm 2

P65 to P68

Alarm 3

P69 to P72

Alarm 2 Relay

Output

Alarm 3 Relay

Output

Digital

Communications

P91 to P94

EIA485

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5. Configuration Level

Configuration of the controller is carried out using a list of ‘P’ codes. Each P code is associated with a particular feature of the controller such as Input Type, Ranging, Control Type, Outputs, Alarms, Digital Communications, Calibration, etc. These are listed in the tables in section 5.2.

!

WARNING

Configuration level gives access to a wide range of parameters which match the controller to the process. 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.

In configuration level the controller is not controlling the process or providing alarm indication. Do not select configuration level on a live process.

5.1 To Select Configuration Level

1. Press and hold until the lower display shows “GoTo” (approximately 4 seconds).

2. Press or to select Conf.

3. Confirm the selection with

.

4. Enter the passcode (default: 4).

5.2 Configuration Level Parameters

Configuration parameters are defined by a set of ‘P’ codes.

1. Press to scroll through the list of ‘P’ codes.

2. Press

or to select the function associated with the ‘P’ code.

3. Press

to accept the function.

 To scroll back press .

A summary and description of the ‘P’ codes is given in the following sections.

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5.3 Configuration - ‘P’ Codes

Use these codes to configure the controller to meet the requirements of the process.

5.3.1 Summary

This section gives an overview of the ‘P’ codes.

Sensor input and Ranging

P1

Pressure input selection

Alarms

P61

Alarm 1 input channel link

P2

Pressure input engineering unit

P62

Alarm 1 type

P3

Pressure input full scale value

P63

Alarm 1 reset mode

P4

Pressure input low scale value

P64

Alarm 1 failsafe mode

P5

Pressure input decimal point position

P65

Alarm 2 input channel link

P6

Pressure input fail safe

P66

Alarm 2 type

Calibration

P7

Shunt calibration

P67

Alarm 2 reset mode

P8

Shunt value

P68

Alarm 2 failsafe mode

P9

Display update time for the pressure input

P69

Alarm 3 input channel link

P70

Alarm 3 type

P71

Alarm 3 reset mode

P72

Alarm 3 failsafe mode

Secondary Input

P11

Secondary input selection

P12

Secondary input function

P19

Secondary input full scale value

Logic input

P81

Logic input configuration

P20

Secondary input low scale value

P82

Logic input status

P21

Secondary input fail safe

Peak detection

P83

Peak detection

Line frequency

P84

Line frequency

P22

Remote set point input range low

P85

Line frequency readout

P23

Remote set point input range high

Auto/Manual

P86

Manual/auto start-up

P24

Secondary input sample time

P87

Manual/auto transfer

Digital communications

P91

Serial communication interface address

Control output

P35

Control output selection

P92

Protocol type

P36

Control output range low

P93

Communication type

P37

Control output range high

P94

Communication baud rate

P38

Control output decimal point position

Pass codes

P98

Level 2

P39

Control output manual mode indication

P99

Configuration level

P40

Direct/reverse selection for control output

Configuration recovery

rec.L

Recovery point

Retransmission

P55

Output selection

P56

Output range low

P57

Output range high

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5.3.2 Pressure Input Selection

Code Description

Range

P1

Configures the Type of Pressure Input. Note: Remember to properly wire the unit’s terminal block

Str

Strain gauge (default)

0-20

0-20 mA

4-20

4-20 mA

0-5

0-5V

0-10

0-10V.

P2

Configures the Pressure Input Engineering Unit Changing the Engineering Unit causes the scaling of

parameter values linked to the pressure input. (for example: if P2 = 10000 PSI , changing from PSI to BAR automatically scales P2 to 689 BAR)

OFf

Off all beacons are

turned off

hGcn2

kg/cm2 beacon lit

PSI

psi beacon lit

bAr

bar beacon lit (default)

nPa

MPa beacon lit

P3

Configures the Full Scale Value for the Pressure Input Changing to this value causes the loading of the default

values for the pressure input low scale, the alarm set points, the remote set point limits, the set point limits, the set point and the retransmission limits and the secondary input low/high range is reset to the primary input value.

from 10 to

99950

Default 10000

P4

Configures the Low Scale Value for the Pressure Input

from -/+ 25% of Full scale value.

Default 0

P5

Configures the Pressure Input Decimal Point Position

Use

or keys to select the position of the decimal

point.

nnnnn nnnn.n nnn.nn nn.nnn n.nnnn

Default nnnnn

P6

Configures the Pressure Input Fail Safe Condition

Hi

High (default)

Lo

Low

5.3.3 Shunt Calibration

Code Description

Range

P7

Configures the Shunt Calibration. This parameter is set to On to enable field calibration of the

pressure transducer. See also section 3.11.

OFF

Off

On

On (default)

P8

Configures the Shunt Value This is the value at which the pressure transducer is

calibrated and is normally stated by the manufacturer of the unit.

From 40.0 to

100.0%

Default 80.0%

5.3.4 Pressure Input Display Update Time

Code Description

Range

P9

Configures the Display update time for the pressure transducer.

A fast update time can be useful to get the display refreshed at every analogue to digital converter sample However, there are instances when this can be a distraction. For this reason display update time may be selected to suit individual preferences.

0.050

50 mS

0.100

100mS

0.250

250mS

0.400

400mS

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5.3.5 Secondary Input

Code Description

Range

P11

Configures the Secondary Input Type Remember to properly wire the unit’s terminal block.

OFF

Disabled

0-20

0-20mA

4-20

4-20mA (default)

0-5

0-5 Volts

0-10

0-10 Volts

Str

Strain Gauge

P12

Configures the Function of the Secondary Input It is available only if P11 is different from OFF. It is alterable if P11 is different from Str; otherwise it is

forced to rSP.

rSP

The input acts as a remote set point (default)

Diff.P

The input acts as the second sensor for differential pressure measurement

P19

Configures the Secondary input full scale value This must be set to match the range of the pressure

transducer in use. It is available only if P11 is different from OFF and P12 is is

equal to Diff.P.

From 0 to the full scale value

Default 10000 (psi)

P20

Configures the Secondary input low scale value. It is available only if P11 is different from OFF and P12 is

equal to diff.P.

From -/+ 25% of the ‘Secondary input full scale value’ set by P19

Default 0

P21

Configures the Remote set point input fail safe condition It is available only if P11 is different from OFF and P12 is

equal to rSP.

HI

High

LO

Low (default)

P22

Configures the Remote set point input range low

From 0 to P3 Default 0

P23

Configures the Remote set point input range high.

From 0 to P3 Default P3

P24

Configures the Sample time for the secondary input

This may be selected to suit the rate of change of the remote set point input.

Using short sample time the process can track the RSP input faster. However, this can result in an increase in noise. For this reason the sample time is made selectable to suit the particular process.

0.100

100ms

0.200

200ms

0.500

500ms (default)

1.000

1000ms

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5.3.6 Control Output

The control output is an analogue output and is always OUT1 on terminals 21 and 22

Code Description

Range

P35

Configures the Type of control output. Remember to wire the terminal block correctly.

0-20

0-20mA

4-20

4-20mA

0-10

0-10 Volts (default)

-10.10

-10 to +10 Volts

0-5

0-5 Volts

P36

Configures the Control output range low This is for scaling the RPM output

-10000 to P37

Default 0. The upper value is limited

by the setting of P37.

P37

Configures the Control output range high This is for scaling the RPM output

P36 to 10000

Default 100.0. The lower value is limited by

the setting of P36.

P38

Configures the Control output decimal point position.

Use the

or keys to select the position of the decimal

point.

nnnnn

nnnn.n Default

nnn.nn

nn.nnn

n.nnnn

P39

Configures the Control output manual mode indication. Use this parameter to select how the output value is shown in

the operator display when the controller is in manual mode; in the range 0-100.0% or scaled with control output high and control output low parameters (RPM indication).

100.0 or rPN 100.0 will show OUT% and rPN will show RPM in the

green display next to the setpoint value.

Default 100.0

P40

Configures the Direct or Reverse action for the control output.

Direct acting means that the value of the control output increases as the value of the in

put (measured value) increases

(PV < SP). Reverse acting means that the control output decreases as

the measured value increases (PV > SP). This parameter also configures the visualisation between the

control output and how it is shown in the controller display.

The first digit shows the relationship between input signal and

displayed output value. The last digit shows the relationship between displayed output signal and the actual output value.

This is shown in the example below

r d (default) r r D d D r

Input

r d

d d

d r

r r

100

0

t

100

0

t

100

0

t

100

0

t

100

0 t 100

0 t 100 0 t

100 0 t

100

0 t 100

0

t

PID

Display

Output

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5.3.7 Retransmission

The measured pressure can be retransmitted as an analogue value on OUT2, terminals 56 and 57.

Code Description

Range

P55

Configures the Type of Retransmission Available only if the retransmission circuit is fitted.

OFF

Disabled

0-20

0-20mA

4-20

4-20mA

0-10

0-10 Volts

-10.10

-10 to +10 Volts

0-5

0-5 Volts

P56

Configures the Low range for the retransmitted output Available only if P55 is different from OFF.

From 0 to P3 Pressure input

full scale value

Default 0

P57

Configures the High range for the retransmitted output Available only if P55 is different from OFF.

From 0 to P3 Pressure input

full scale value

Default P3

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5.3.8 Alarms

Up to three alarms can be configured. They are used to detect out of range values.

Code Description

Range

P61

Configures the Alarm 1 selection.

All alarms can be attached to the measured pressure, a deviation from setpoint, a band about the pressure measurement or turned off.

OFF

Disabled

Proc

Process alarm (default)

band

Band alarm

dev

Deviation alarm

P62

Configures the Alarm 1 type.

Available only if P61 is different from OFF.

If P61 is configured as a band alarm, high means outside the band while low means inside the band.

HI

High - an alarm will be triggered if the measured value exceeds a high setting

LO

Low – an alarm will be triggered if the measured value exceeds a low setting

InhIb

Low with mask at start up (sometimes referred to as ‘blocking’). A low alarm will be inhibited until the process has gone above the alarm value for the first time. (default)

P63

Configures the Alarm 1 reset mode.

Available only if P61 is different from OFF.

The alarm reset mode determines if the alarm resets once the alarm condition is no longer true or whether the alarm needs to be reset manually.

AUto

Automatic (default). The alarm is no longer indicated once it is no longer true.

LAtCh

Latching. The alarm remains indicated even if it is no longer true. It can be manually reset by pressing the ‘Reset’ button on the front panel or by making a contact between terminals 23 and 24 (if P81 is configured as AL or AL-P).

P64

Configures the Alarm 1 failsafe mode.

1

Available only if P61 is different from OFF.

This parameter determines the action the alarm will take in the event of a power fail to the instrument. In failsafe mode when the controller is powered on the normally closed contact is held open while the normally open contacts are held closed. On power failure they are released as the relay relaxes.

This feature should be used as a shut down alarm.

FS

Failsafe (default). In the event of a power fail the alarm will activate.

nFS

Non failsafe

P65

Configures the Alarm 2 selection. To disable alarm 2 or set it as Process, Band or

Deviation alarm the same as P61

Same as P61

P66

Configures the Alarm 2 type

Available only if P65 is different from OFF.

Same as P62. Default HI.

P67

Configures the Alarm 2 reset mode.

Available only if P65 is different from OFF.

Same as P63

P68

Configures the Alarm 2 failsafe mode

Available only if P65 is different from OFF.

Same as P64

P69

Configures the Alarm 3 selection. To disable alarm 2 or set it as Process, Band or

Deviation alarm the same as P61

Same as P61

P70

Configures the Alarm 3 type

Available only if P69 is different from OFF.

Same as P62. Default Hi

P71

Configures the Alarm 3 reset mode.

Available only if P69 is different from OFF.

Same as P63

P72

Configures the Alarm 3 failsafe mode

Available only if P69 is different from OFF.

Same as P64

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5.3.9 Logic Input

The Logic Input is fitted as standard and can be configured as a reset for alarms or peak detection, or it can be used to externally select the pressure transducer calibration. It is a contact closure input but is edge triggered on contact closure.

Code Description

Range

P81

Configures the Logic Input

This is the logic input connected to terminals 23 and 24.

Do not confuse this with the digital inputs DIG1 to DIG4 which have fixed functionality.

OFF

Disabled

AL

Alarm reset

P

Peak reset

AL-p

Alarm + peak reset (default)

CAL.0

Zero calibration

ALL

Zero calibration + alarm reset + peak reset

P82

Configures the Status of the logic input

Available only if P81 is different from OFF

CLOSE

The logic input is considered active when the contact is closed. (default)

OPEn

The logic input is considered inactive when the contact is open.

Note: The controller has four additional digital inputs. These are a fixed configuration where:DIG1 = Manual DIG2 = Increase output value DIG3 = Decrease output value DIG4 = Set the control output to 0. The front panel Auto/Man keys are disabled They do not require P codes to configure.

5.3.10 Peak Detection

Code Description

Range

P83

Configures the Polarity of the peak detection

P83 determines whether the maximum or minimum value of the measured signal is recorded by the controller.

The value is stored until it is reset by the front panel Reset key or by an external connection across terminals 23 and 24, (assuming P81 is configured as AL or AL-P).

OFF

Disabled

HI

Maximum peak (default)

LO

Minimum peak

5.3.11 Line Frequency

Code Description

Range

P84

Configures the Line frequency rejection

The frequency of the ac supply can be detected automatically or selected manually.

It does not apply to certain conditions such as 24V DC power supply.

50

50 Hz

60

60 Hz

AUto

Line frequency is detected automatically (default).

P85

Configures the Line frequency readout. This is a read only value of the detected line frequency. Available only when P84 is set to Auto

50

50 Hz. when the device is able

to detect correctly 50 or 60 Hz line frequency

60

60 Hz

Und.50

automatic detection of the line frequency does not work (e.g. 24V DC power supply); a 50 Hz rejection is assumed.

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5.3.12 Manual/Auto Start-Up

Code Description

Range

P86

Configures the Controller status at power on. The controller can be made to start up in Manual mode

(power output demanded manually) or Automatic – power output controlled in closed loop.

It is normal to start an extruder, for example, in Manual, but with output limited to reduce the risk of over-ranging the pressure, then switch over to Automatic control once steady conditions have been achieved.

AUto

Automatic closed loop control

Nan

Manual control (default)

P87

Configures the Manual/Auto transfer. When control is transferred from Automatic (closed loop) to

Manual the output remains at the value when in auto. It can be raised or lowered from this value manually.

On transfer from Manual to Auto the controller takes the value in manual and gradually changes it according to the calculated demand from the control algorithm.

BUNpL

Bumpless mode (without modification of set point). This is the default mode.

SP

Set point modification mode

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5.3.13 Digital Communications

Digital communications is orderable. It uses Modbus or Jbus protocol and EIA485 2-wire interface .

Code Description

Range

P91

Configures the Serial communication interface address.

Available only if Modbus/Jbus serial communication interface is fitted.

On a network of instruments the address is used to specify a particular instrument. Each instrument on a network should be set to a unique address from 1 to 255.

OFF

Disabled (default)

1 to 255

An address of 1 to 255 can be set for any particular instrument.

P92

Configures the Protocol type.

Available only P91 is different from OFF.

Nodbs

Modbus (default)

JbUS

Jbus

P93

Configures the Parity type.

Available only P91 is different from OFF.

Parity is a method of ensuring that the data transferred between devices has not been corrupted. Parity is the lowest form of integrity in the message, it ensures that a single byte contains either an even or an odd number of ones or zeros in the data. In industrial protocols, there are usually layers of checking to ensure that first the byte transmitted is good and then that the message transmitted is good. Modbus applies a CRC (Cyclic Redundancy Check) to the data to ensure that the packet of data is not corrupted. Thus, there is usually no benefit in using odd or even parity, and since this also increases the number of binary bits transmitted for any messages, it decreases throughput.

8none

8 bit without parity (default)

8Even

8 bit + even parity

8odd

8 bit + odd parity

P94

Configures the Baud rate.

Available only P91 is different from OFF.

The baud rate of a communications network specifies the speed at which data is transferred between the instrument and the master. As a rule, the baud rate should be set as high as possible to allow maximum throughput. This will depend to some extent on the installation and the amount of electrical noise the communications

link is subject to, but the instruments are capable of reliably operating

at 19,200 baud under normal circumstances and assuming correct line termination.

Although the baud rate is an important factor, when calculating the speed of communications in a system it is often the 'latency' between a message being sent and a reply being started that dominates the speed of the network. This is the amount of time the instrument requires on receiving a request before being able to reply.

For example, if a message consists of 10 characters (transmitted in 10msec at 9600 Baud) and the reply consists of 10 characters, then the transmission time would be 20 msec. However, if the latency is 20msec, then the transmission time has become 40msec. Latency is typically higher for commands that write to a parameter than those that read, and will vary to some degree depending on what operation is being performed by the instrument at the time the request is received and the number of variables included in a block read or write. As a rule, latency for single value operations will be between 5 and 20 msec, meaning a turnaround time of about 25-40msec. This compares very favourably with competing devices, which can often take as much as 200msec to turn around communications transactions.

If throughput is a problem, consider replacing single parameter transactions with Modbus block transactions, and increase the baud rate to the maximum reliable value in the installation

600

600 bps

1200

1200 bps

2400

2400 bps

4800

4800 bps

9600

9600 bps

19200

19200 bps (default)

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5.3.14 Pass codes

Pass codes are required to enter both Operator Level 2 and Configuration Level. They are set to default values during manufacture but they can be re-configured using P98 and P99.

Code Description

Range

P98

Configures the Level 2 pass code.

The pass code required to enter Level 2 can be set in the range 0 to 9999.

In the case of level 2 pass code being set to 0, it will not be necessary to enter a pass code to access level 2 and the controller will enter level 2 directly.

0

No pass code is necessary to enter level 2.

1 to 9999

Default 2

P99

Configures the Configuration level pass code.

The pass code required to enter Configuration Level can be set in the range 0 to 9999.

In the case of the configuration level pass code being set to 0, it will not be necessary to enter a pass code to access configuration level and the controller will enter ConF directly.

0

No pass code is necessary to enter configuration level.

1 to 9999

Default 4

5.3.15 Recovery Point

Recovery Point is a way to initialize all parameter values to factory default values stored in read only memory. This can act as a very useful ‘Undo’ feature.

rEc.L Scroll to rEc.L to select Recovery point.

none

Do nothing (default). The current settings will be used.

Fact

Load and restore the factory default settings.

The configuration and parameter values loaded

during manufacture may be restored.

To Restore the Factory Default Settings

Select rEc.L

Press to select and to move on to the next parameter (in this case to the beginning of the ConF list).

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6. Control

This section shows an example of how the control loop operates and how it may be used to control the melt pressure in an extrusion process.

The actual melt pressure (PV) is measured by the transducer which is connected to the input of the controller. This is compared with a setpoint (or required) pressure (SP) set by the user. If there is an error between the set and measured pressure the controller calculates an output value which is used to trim the speed of the extruder drive. The calculation depends on the process being controlled and is based on a PID (Proportional, Integral, Derivative) algorithm. In extruder pressure control the Derivative term is turned off (set to 0 by default).

This arrangement is referred to as the control loop or closed loop control.

The following sections describe the PID parameters in general terms.

6.1.1 Control Algorithm

The PID algorithm may also be referred to as ‘Three Term Control’. The three terms are: Proportional band PB Integral time ti Derivative time TD The output from the controller is the sum of the contributions from these three terms. The combined output is a

function of the magnitude and duration of the error signal, and the rate of change of the process value. In Operator Level 2 it is possible to manually adjust these parameters and in some applications they may be set

automatically using the Auto Tune feature (section 6.2).

6.1.2 Proportional Band ‘PB’

This section describes the effect of the proportional term only, that is with the integral and derivative terms turned off. The proportional band, or gain, delivers an output which is proportional to the size of the error signal. It is the range over which the output power is continuously adjustable in a linear fashion from 0 to

100.00%. Below the proportional band the output is full on (100%), above the proportional band the output is full off (0) as shown in the diagram below.

The width of the proportional band determines the magnitude of the response to the error. If it too narrow (high gain) the system oscillates by being over responsive. If it is too wide (low gain) the control is sluggish. The ideal situation is when the proportional band is as narrow as possible without causing oscillation.

Pressure

measured (PV)

Control

Loop

Drive

Drive setpoint (trim)

Pressure SP

Error

Control

algorithm

Analogue

output

Proportional band

PV

Setpoint

wide

Output

100%

0%

narrow

PV

Time Setpoint

Increasingly narrower

proportional band

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The diagram also shows the effect of narrowing proportional band to the point of oscillation. A very wide proportional band results in straight line control but with an appreciable initial error between setpoint and PV. As the band is narrowed the PV gets closer to setpoint. If the proportional band is very narrow the loop becomes unstable resulting in an oscillatory response.

The proportional band is set as a percentage of the controller range. In practice although proportional only control will result in steady state control there will, most likely, be an

offset between the SP and PV. This can be compensated for by adding an integral term as described in section

6.1.3 below.

6.1.3 Integral Term ‘Ti’

In a proportional only controller, an error between setpoint and PV must exist for the controller to deliver an output. Integral is used to achieve zero steady state control error.

The integral term slowly shifts the output level as a result of an error between setpoint and measured value. If the measured value is below setpoint the integral action gradually increases the output in an attempt to correct the error. If it is above setpoint integral action gradually decreases the output to correct the error.

The diagram below shows the result of introducing integral action.

The units for the integral term are measured in time (0.1 to 99.9 seconds). The longer the integral time constant, the more slowly the output is shifted and results in a sluggish response. Too small an integral time will cause the process to overshoot and even oscillate.

6.1.4 Derivative Term ‘TD’

Derivative action, or rate, provides a sudden shift in output as a result of a rapid change in error. If the measured value falls quickly derivative provides a large change in output in an attempt to correct the perturbation before it goes too far. It is most beneficial in recovering from small perturbations.

The derivative modifies the output to reduce the rate of change of error. It reacts to changes in the PV by changing the output to remove the transient. Increasing the derivative time will reduce the settling time of the loop after a transient change.

Derivative is often mistakenly associated with overshoot inhibition rather than transient response. In fact, derivative should not be used to curb overshoot on start up since this will inevitably degrade the steady state performance of the system.

Derivative is generally used to increase the stability of the loop, however, there are situations where derivative may be the cause of instability. For example, if the PV is noisy, then derivative can amplify that noise and cause excessive output changes. This is the situation typically associated with the control of melt pressure in an extruder and it is recommended to turn the derivative term off in this application. Off is the default value in P304c.

Proportional

only control

Measured variable

Time

Setpoint

Proportional +

Integral control

Measured Time

SP

Proportional + Integral

response

Measured

variable

Time

SP

Response with derivative

action included

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6.2 Tuning

In tuning, the PID parameters of the controller are matched to the process being controlled in order to obtain stable control.

There are two types of procedures which can be selected:

6.2.1 TUNE Function

The basic concepts of autotuning a system are based on the open loop step response. For this reason the TUNE function may only be activated in manual mode.

The equivalent mathematical model of the process is characterised by three parameters: the gain, the time constant and the equivalent time delay.

The power output of the controller is changed by a small step value and the controller stores the process variable response. When the transient response is finished, the controller estimates the three basic process parameters by means of the areas method and then it calculates the PI or PID parameters.

The step response is a convenient way to characterise this type of process dynamics because of its modest alteration of the behaviour of the process and its capabilities to estimate the process parameters with high precision.

• To implement the TUNE algorithm set the instrument to Manual mode – the ‘Man’ Indication will be lit.

Then, in level 2, select tUnE to On. During this procedure the ‘Tune’ status indication will be flashing.

• The TUNE function will switch off after the PID parameters have been calculated, and the ‘Tune’ status

indication extinguished.

6.2.2 ADAPTIVE Function

The ADAPTIVE function is an on-line algorithm that "observes" the measured value and looks for oscillation due to a variation of the load or the set-point. When a significant pattern is “recognised” a decisional procedure starts in order to recalculate the PID parameters.

The ADAPTIVE function is recommended for pressure control applications where the cycling of the output using the TUNE function described above is to be avoided.

• To implement the ADAPTIVE algorithm set the instrument to Automatic mode. Then, in level 2, select

tUnE to On. During this procedure the ‘Tune’ status indication will be steady. In this case the On setting will be remembered by the instrument even if the instrument is switched off.

• In order to deactivate the adaptive function, it is necessary to return the tUnE parameter to OFF.

• When the ADAPTIVE procedure is enabled the PID parameters (PB, Ti, TD – Level 2) can only be

monitored as they are calculated. Manual adjustment is inhibited.

6.2.3 Automatic stand-by:

This function avoids overshoot due to temporary process interruptions (PV goes to zero). In these cases the controller output rapidly reaches saturation of the integral factor. When the process restarts

the controlled output will have an excessive and potentially dangerous high output level. In an extruder the drive would then start at full speed.

When the “automatic stand-by” function is activated (Level 2, ASb = On) the algorithm monitors the controller input and output. When the input value goes lower then a threshold (specified by the “automatic stand-by pressure low limit” parameter ASb.PL) and the output value reaches the saturation condition, the control output immediately assumes the last value stored when the process was stable.

This freezing of the output of the controller will last for a time specified by the “automatic stand-by recovery time” parameter (Level 2, ASb.rt).

If the controller input does not recover within the specified time, the output value is forced to zero. If the controller input recovers within the specified time, the algorithm waits for two and half times the integral

value. After this time has elapsed, the controller will return automatically to normal “running” conditions, that is, to the output level calculated when the process was stable.

6.3 Start up of a Process

The P304c allows a process to be started in Manual or Automatic mode. The default is Manual since most of the applications for which this instrument is designed is for extruder melt pressure control which modifies the motor speed to control the pressure. It is generally not recommended to start motor control applications in automatic.

However, there are non motor speed applications for which the P304c may be used where automatic start up is recommended.

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7. Digital Communications

Digital Communications (or ‘comms’ for short) allows the controller to communicate with a PC or a networked computer system. The pc may be running a SCADA package or iTools software which is a free downloadable package available from www.eurotherm.co.uk

and is used (in some instruments for configuration purposes) or

for setting and cloning parameters. This product conforms to Modbus/Jbus RTU protocol a full description of which can be found on

www.modbus.org. One optional EIA485 port on terminals 60, 61 and 62 may be ordered with the following specification:-

Electrical interface Optional, EIA485 type, opto-isolated.

Protocol type Modbus/Jbus (RTU mode). Configured by ‘P’ code P92

Type of parameters Run-time and configuration. Both are available

by serial link.

Configuration software

Through a dedicated PC software application

package.

Device address From 1 to 255.

Note: The device physical interface can only support up to 31 devices for each segment.

Use multiple segments for more of 31 devices.

Configured by ‘P’ code P91

Baud rate 600 up to 19200 baud. Configured by ‘P’ code P94

Format 1 start bit, 8 bit with/without parity, 1 stop bit Configured by ‘P’ code P93

Parity Even/Odd.

Each parameter has its own unique Modbus address. A list of the most commonly used parameters is given in Appendix 10.

7.1 EIA485 Field Communications Port

To use EIA485, buffer the EIA232 port of the PC with a suitable EIA232/EIA485 converter. The Eurotherm KD485 Communications Adapter unit is recommended for this purpose. The use of a EIA485 board built into the computer is not recommended since this board may not be isolated, which may cause noise problems, and the RX terminals may not be biased correctly for this application.

To construct a cable for EIA485 operation use a screened cable with one (EIA485) twisted pair plus a separate core for common. Although common or screen connections are not necessary, their use will significantly improve noise immunity and their use is recommended in a factory environment.

7.2 Modbus/JBus Protocol

A description of the use of Modbus or JBus protocol is given in the Communication Handbook part number HA026230 which may be downloaded from www.eurotherm.co.uk

.

This should be used in conjunction with the list of parameter addresses given in Appendix 10.

The user should also be aware of the following:-

!

Warning

In common with most instruments in its class, the P304 Range uses a non-volatile memory with a limited number of specified writes. Non-volatile memory is used to hold information that must be retained over a power cycle, and typically, this includes setpoint and status information.

Please ensure that parameters which do not require updating on a regular basis (for example, setpoints, alarm trip levels, hysteresis, etc) are only written to when a change in the parameter value occurs. Failure to do this could result in permanent damage to the internal EEPROM.

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8. Instrument Calibration

The controller is calibrated during manufacture using traceable standards for every input and output range. It is, therefore, not necessary to calibrate it when changing ranges. Furthermore, the use of a continuous automatic zero correction of the input ensures that the calibration of the instrument is optimised during normal operation.

Also, retro-fitting an optional board does not require the calibration of the added circuit, because the board will be shipped from factory already calibrated.

However, there are certain statutory procedures which require verification and possible re-calibration of the instrument. This section describes the procedure and should not be confused with user calibration of the pressure transducer described in section 3.11.

8.1 To Access Calibration Mode

Select Configuration level as stated in section 5.1.

1. Then, when ConF is being displayed, press and hold the

button again for about 4 seconds until the

Goto message is shown.

2. Press the or button to select ICAL

3. Press

to confirm and enter the level.

4. The display will show

I CAL

5. Press

to scroll through a list of inputs and outputs which may be calibrated (or press to return to the previous parameter). The list of all possible calibration parameters (not all of which will be applicable to your particular controller) is given below:-

Parameter Circuit Input/output Type Range Value Note

PL.020

Pressure input Current Zero 0mA

PH.020

Pressure input Current Full scale 20mA

P .020

Pressure input Current Verify (1)

PL.0 5

Pressure input Voltage 0/5V Zero 0V

PH.0 5

Pressure input Voltage 0/5V Full scale 5V

P .0 5

Pressure input Voltage 0/5V Verify (1)

PL.010

Pressure input Voltage 0/10V Zero 0V

PH.010

Pressure input Voltage 0/10V Full scale 10V

P .010

Pressure input Voltage 0/10V Verify (1)

SL.020

Secondary input Current Zero 0mA

SH.020

Secondary input Current Full scale 20mA

S .020

Secondary input Current Verify (1)

SL.0 5

Secondary input Voltage Zero 0V

SH.0 5

Secondary input Voltage Full scale 5V

S .0 5

Secondary input Voltage Verify (1)

SL.010

Secondary input Voltage Zero 0V

SH.010

Secondary input Voltage Full scale 10V

S .010

Secondary input Voltage Verify (1)

sL.tc

Secondary input Thermocouple Zero 0mV

SH.tc

Secondary input Thermocouple Full scale 50mV

s.tc

Secondary input Thermocouple Verify (1)

S-. rJ

Secondary input Thermocouple Ref. junction Ambient temperature

S . rJ

Secondary input Thermocouple Verify Ambient temperature

SL.rTD

Secondary input RTD-Pt100 Zero 0 Ohm

sH.rTD

Secondary input RTD-Pt100 Full scale 320 Ohm

S .rTD

Secondary input RTD-Pt100 Verify (1)

sL.Pt5

Secondary input RTD-Pt500 Zero 0 Ohm

sH.Pt5

Secondary input RTD-Pt500 Full scale 1600 Ohm

44 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

Parameter Circuit Input/output Type Range Value Note

S .Pt5

Secondary input RTD-Pt500 Verify (1)

NL.Cur

Main analogue output OUT1 Current Zero -5mA

NH.Cur

Main analogue output OUT1 Current Full scale 25mA

N .Cur

Main analogue output OUT1 Current Verify (2)

NL.vOL

Main analogue output OUT1 Voltage Zero -12.5V

NH.vOL

Main analogue output OUT1 Voltage Full scale +12.5V

N .VOL

Main analogue output OUT1 Voltage Verify (2)

SL.Cur

Secondary analogue output OUT2 Current Zero -5mA

SH.Cur

Secondary analogue output OUT2 Current Full scale 25mA

S .Cur

Secondary analogue output OUT2 Current Verify (2)

SL.vOL

Secondary analogue output OUT2 Voltage Zero -12.5V

SH.vOL

Secondary analogue output OUT2 Voltage Full scale +12.5V

S .vOL

Secondary analogue output OUT2 Voltage Verify (2)

DEFLT

Load default calibration and code data. Note: If an incorrect calibration is performed an error code

may be displayed. A list of error codes is given in section

8.2.

Off

No action

On C

Load default calibration values.

Then press

to confirm.

The value stated in the ‘Value’ column is the value at which the instrument is calibrated. This is further shown in the examples at the end of this section.

Notes:

(1) The display values for analogue inputs are scaled from 0 to 25000 counts.

(2) Use the or keys to select a display value from 0 to 10 and to check the linearity of output circuit

at 0%, 10%, .. 90% and 100% of full scale value +/- 0.05% of full scale value.

(3) When the display is showing

I CAL

it is possible to interrogate a number of functions as follows.

Press or to select:-

- Firmware revision

- Pressure input counts

- Zero, for the strain gauge input (P.SG.Lo)

- Span, for the strain gauge input (P.SG.Hi)

- Pressure (P.SG)

- Zero, for the linear inputs (P.Li.Lo)

- Span, for the linear inputs (P.Li.Hi)

- Current (P.020)

- Voltage, 0-10V (P.010)

- Secondary input counts

- Zero, for the strain gauge input (S.SG.Lo)

- Span, for the strain gauge input (S.SG.Hi)

- Pressure (S.SG)

- Zero, for the linear inputs (S.Li.Lo)

- Span, for the linear inputs (S.Li.Hi)

- Current (S.020)

- Voltage, 0-10V (S.010)

- Thermocouple and RTD (S.TC.PT)

- Reference junction (S.rJ)

- Line resistance for RTD (S.rL)

- Line frequency (FrE)

- Digital inputs status (DIG.In)

- Minimum power consumption. The display will blank as the instrument is consuming minimum power

- Maximum power consumption. The display will show all segments as the instrument is consuming maximum power

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8.2 Error Codes

The following error codes could be displayed:-

Code Meaning

1 Error during EEPROM access.

2 The TUNE (auto tune) function is not able to apply the step change because the manual output value plus the step

value is over/under the output limits

3 Wrong zero measure

4 TUNE (auto tune) function aborted due to an over/under-range of the measured input.

5 Input calibration error.

6 Wrong reference junction measure.

7 TUNE (auto tune) function aborted due to an high delay time over constant time ratio.

8 Error during the automatic calculation of the filter time constant

9 Too many attempts during process estimation.

10 TUNE (auto tune) function aborted due to a negative constant time or a negative process gain

11 Overload or short-circuit on strain gauge power supply. "+EXC" or "-EXC" unconnected wire for strain gauge input.

13 Wrong span measure

14 Internal I2C bus communication error with EEPROMs

15 Internal I2C bus communication error with i/o expanders.

RAM Failure of RAM circuit. The device needs repair

In the case of differential pressure input, the error message in the “Normal display mode” points out the kind of failure: scroll through the Level 1 list and look at the “PI.VAL” or “SI.VAL” parameters to identify the faulty channel.

When the upper display shows "Err" and the lower display shows a parameter mnemonic code this means that the related parameter is in error status.

In this situation two options are available:

1) If the wrong parameter is a run-time or configuration parameter, pressing the

+ push-buttons

the instrument will load the default values for all parameters.

2) If the wrong parameter is a calibration parameter pressing the SCROLL + PAGE push-buttons will enable the instrument to access run-time parameters; this function is intended only to restore a misplaced parameter's value, then the performances of the instrument are not guaranteed. The user is advised to check the stated calibration or code parameter.

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8.3 Example 1: To Calibrate the 0-10V Main Input

Connect a calibrated voltage source the main input terminals as shown.

Action Display Notes

Press to scroll to the low calibration point for the 0-10V main input, PL.010

OFF PL010

Set the voltage input source to 0.000V Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press to enter the low calibration mode

O n pL.010

The top display will show a decimal point for a few seconds as the input calibrates to minimum range value.

If successful the display will go to the high calibration point, PH.010

OFF pH.010

If unsuccessful the display will show Err5 – Input calibration out of range. Check the setting of the voltage source.

Set the voltage input source to 10.000V Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press

to enter the high calibration

mode

On pH.010

The top display will show a decimal point for a few seconds as the input calibrates to maximum range value (10.000V).

If successful the display will go to verify,

P .010

25000 p .010

The upper display shows the number of counts relative to the measured value. the calibration is correct if the number of counts is within 25000 + 10counts

Check the linear input by resetting the calibrator to 0.00V

The resulting indication should be 0 + 10

counts

Check the linearity by setting the calibrator to 5V

The resulting indication should be 12500 +

20 counts

Press to select the next calibration parameter

The procedure for calibrating the 0-10V secondary voltage input is the same but uses the parameters:

SL.010 SH.010 SH.010

Copper cable

Voltage

Source

+

-

P304c

Controller

19 +

17 -

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8.4 Example 2: To Calibrate the 0-5V Main Input

Connect a calibrated voltage source the main input terminals as shown.

The procedure is the same as for the above example but uses different parameters and voltage values.

Action Display Notes

Press to scroll to the low calibration point for the 0-10V main input, PL.0 5

OFF PL0 5

Set the voltage input source to 0.000V Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press to enter the low calibration mode

On pL.0 5

The top display will show a decimal point for a few seconds as the input calibrates to minimum range value.

If successful the display will go to the high calibration point, PH.0 5

OFF pH.0 5

If unsuccessful the display will show Err5 – Input calibration out of range. Check the setting of the voltage source.

Set the voltage input source to 5.000V Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press

to enter the high calibration

mode

On pH.0 5

The top display will blank for a few seconds as the input calibrates to maximum range value (5.000V).

If successful the display will go to verify,

P .0 5

25000 p .0 5

The upper display shows the number of counts relative to the measured value. the calibration is correct if the number of counts is within 25000 + 10counts

Check the linear input by resetting the calibrator to 0.00V

The resulting indication should be 0 + 10

counts

Check the linearity by setting the calibrator to 2.5V

The resulting indication should be 12500 +

20 counts

Press to select the next calibration parameter

The procedure for calibrating the 0-5V secondary voltage input is the same but uses the parameters:

SL.0 5 SH.0 5 SH.0 5

Copper cable

Voltage

Source

+

-

P304c

Controller

19 +

17 -

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8.5 Example 3: To Calibrate the 0-20mA Main Input

Connect a calibrated voltage source the main input terminals as shown.

The procedure is the same as for the above example but uses different parameters and voltage values.

Action Display Notes

Press to scroll to the low calibration point for the 0-20mA main input, PL.020

OFF PL020

Set the mA input source to 0.000mA or

0.00mV or 0.000V (even if the minimum range is 4mA).

Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press to enter the low calibration mode

On pL.020

The top display will show a decimal point for a few seconds as the input calibrates to the minimum range value.

If successful the display will go to the high calibration point, PH.020

OFF pH.020

If unsuccessful the display will show Err5 – Input calibration out of range. Check the setting of the current source.

Set the current input source to 20mA Wait a few seconds for the measurement to

stabilise

Press or keys to select On

Press

to enter the high calibration

mode

On pH.020

The top display will blank for a few seconds as the input calibrates to maximum range value (20mA).

If successful the display will go to verify,

P .020

25000 p .020

The upper display shows the number of counts relative to the measured value. the calibration is correct if the number of counts is within 25000 + 10counts

Check the linear input by resetting the calibrator to 0.00mA

The resulting indication should be 0 + 10

counts

Check the linearity by setting the calibrator to 10.0mA

The resulting indication should be 12500 +

20 counts

Press to select the next calibration parameter

The procedure for calibrating the 0-20mA secondary current input is the same but uses the parameters:

SL.020 SH.020 SH.020

Copper cable

mA

Source

+

-

P304c

Controller

19 +

17 -

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8.6 Example 4: To Calibrate the Control Output (OUT1) - Voltage

The example is given for 0-10V output. Connect a calibrated volt meter to the retransmission output

terminals 21 and 22.

Action Display Notes

Press to scroll to the main analogue output low calibration point, NL.voL.

2600 NLvoL

The upper display should read between 0 and 20000.

Press or keys to adjust the reading on the output meter for -12.5V +2mV

2864 NLvoL

The number shown in the upper display is an example only. The instrument memorises this value as zero.

Press to scroll to the main analogue output high calibration point, NH.voL.

15200 N H voL

The upper display should read between 0 and 20000.

Press or keys to adjust the reading on the output meter for +12.50V +2mV

15300 NLvoL

The number shown in the upper display is an example only. The instrument memorises this value as full scale.

Press to scroll to the main analogue output verify calibration point, N .voL

0

N voL

With a reading of 0 the voltmeter should show -12.5Vdc. The voltmeter reading will change by 2.5V for every unit change which is made on the instrument. It is not generally necessary to make these checks.

Check the linear calibration by pressing

or keys to modify the value on the upper display from 0 to 10 and check the linearity of the out circuit at 0%, 10% etc to 100% of full scale value

The maximum error must be +2mV

Press to select the next calibration parameter

For a current output substitute the voltmeter for a calibrated ammeter. The following parameters apply:

NL.CUr The low calibration point should read -5mA NH.CUr The high calibration point should read +25mA N .CUr

The secondary analogue output (OUT2) may be calibrated the same as the above procedure. Refer to the table in section 8.1 for the relevant parameters.

To leave calibration level, press and hold

until the Goto display is shown and use the or button to

select the desired level of operation.

P304c

Controller

21 +

22 -

20.00

Digital Voltmeter

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9. CPI (Configuration Port Interface)

In addition to the EIA485 digital communications port, the instrument is provided with an internal port which allows field upgrade of the firmware and also configuration and upload/download of the complete instrument parameter set (cloning function).

Do not use this port for any other purposes.

9.1 CPI Adaptor

A choice of two configuration clips is available from Eurotherm either of which may be ordered as part of the iTools configuration package or as a separate item:

1. USB CPI Clip which may be ordered quoting part

number IToolsNONE-USB. This consists of a cable fitted with a USB interface for the pc and a 5-pin clip which connects to the instrument.

2. A alternative EIA232 9-pin serial port interface clip

may be ordered quoting part number IToolsNONECK. This consists of a cable fitted with a 9-pin D type connector for the pc serial port, an international power supply (European; US/Japan and UK) and the 5-pin instrument clip.

The 5-pin clip can be connected to the instrument either in or out of its sleeve. It is not necessary to power the instrument since power is supplied through the adaptor.

With the adaptor fitted all functions of the instrument are disabled, and the instrument is put into ‘remote’ mode If the instrument is powered up the ‘Rem’ beacon is lit, but the remainder of the display is blank.

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9.2 Firmware Update Procedure

The firmware code is stored in a rewritable Flash memory and it can be updated following the below procedure.

Required tools:

•

A PC with serial COM port or with an USB to Serial adapter.

• A CPI (Configuration Port Interface) adapter as shown in the previous section.

• The “Flash Magic” PC tool, available for download at the http://www.flashmagictool.com URL.

1. Disconnect the indicator/controller unit from power supply. Enable the boot-loader by linking the SH5

“coffee bean” by means of a soldering iron. This is found at the top of the middle board. An alternative is to press and hold the - - keys combination during power-on.

3. Connect the CPI adapter to the PC and to the indicator/controller device.

4. Supply power to the indicator/controller unit trough the CPI power supply or USB port or the terminal block,

in no case will the display light up.

5. Download, install and start the “Flash Magic” PC tool, it works on any versions of Windows, except Windows

95. 10Mb of disk space is required.

6. Select in the “Step 1 - Communications”

frame:

• The COM Port being used.

• The Baud Rate, maximum 115200

Baud.

• The Device, LPC2364. Some

prototypes are fitted with the LPC2366. “Flash Magic” warns about improper device.

• The Interface, None (ISP).

• The Oscillator Freq. (MHz),14.748.

7. Check the “Erase all Flash+Code Rd Prot”

option.

8. Using the “Browse…” button select the

Hex file to download into the device.

9. In the “Step 4 - Options” frame check the

“Verify after programming” option and uncheck the other options.

10. Click on the “Start” button to launch the

procedure. The bottom bar should report in sequence the messages below:

- Attempting to connect…

- Erasing device…

- Programming device (0x00000000)…

- Verifying (0x00000000)…

- Finished

11. Remove power from the indicator/controller unit and disconnect the CPI adapter.

12. Disable the boot-loader by removing the short-circuit on the SH5 “coffee bean”.

13. Reconnect the controller unit to the power supply and check the result of the firmware update. Possible

error messages on the display may happen due to inconsistency between the updated firmware and the data stored in the non-volatile (EEPROM) memory.

Troubleshooting

In same rare cases, the “Flash Magic” prompts the “Unable to communicate…. Try raising or lowering the baud rate” message. Retry setting the baud rate to 57600.

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10. Appendix A Modbus and Jbus Addresses

10.1 Multiplier and Decimal figures

Some parameters have a related variable stated as “multiplier”; this system allows the limits of +/- 32767 counts to be overcome.

Example: the measured value 80000 is sent as 1600 and a multiplier of 50. The host must know the multiplier before writing a value. The multiplier is chosen by the device (unless pressure input full scale value selection). Similarly some parameters have a related variable stated as “decimal figures” indicating the decimal point

position.

10.2 S2K IEEE floating point notation

Some variables are mirrored as a floating point value in the MODBUS IEEE region at 8000h. In this case the address is multiplied by 2 and offset by 8000h. For example, ‘Alarm 1 Threshold address of 1105 is IEEE 34978.

Two Modbus registers are read and interpreted as a single IEEE value. When a variable supports this notation the MODBUS IEEE address is indicated in the Variable Address column.

10.3 Level 1 and Level 2 Parameters

Mnem. Parameter Modbus Jbus Range

Local/remote device status 218 219 0 = local

1 = remote At power up, each slave is in local mode. In order to enable a slave to be controlled from the master,

it is necessary to set the local/remote device status. For a slave to remain in remote status, it is sufficient to

detect line activity. If there is no l

ine activity for more than 3 seconds every slave

will automatically return to local mode. If remote is issued via CPI port the slave doesn’t automatically return to local mode.

Local mode: The communication between master and slave is limited to

transferring data from slave to master without the possibility of modifying any parameter from the master itself (with the exception of the local/remote device status and the error handling variables). Therefore, from the local keyboard, parameters can be displayed and modified.

Remote mode: The instrument parameters can be modified by the master.

Therefore, from the instrument front, the parameters can only be displayed but not modified.

SP

SETPOINT 1100 1101

AL.NAS

ALARMS MASK RESET 1101 1102 1 = restore the alarm mask

The write of ‘0’ to this address is allowed and has no effect.

A-N

AUTO/MANUAL SELECTION

1104

1105

0 = selection from front panel or serial communication 1 = selection from rear terminal block

Lr.SP

LOCAL/REMOTE SET POINT SELECTION

1215 1216 0 = local

1 = remote

SP.Lo

SET POINT LIMIT LOW

1332 1333

SP.Hi

SET POINT LIMIT HIGH

1334 1335

SP.rr

SET POINT RAMP

AL1

ALARM 1 THRESHOLD

1105 1106 See also the example in section 10.2 above.

Decimal figures assigned to alarm 1 threshold

1106 1107

Multiplier assigned to alarm 1 threshold

1107 1108

A1.HS

ALARM 1 HYSTERESIS 1406 1407

AL2

ALARM 2 THRESHOLD

1108 1109

A2.HS

ALARM 2 HYSTERESIS 1408 1409

AL3

ALARM 3 THRESHOLD

1111 1112

A3.HS

ALARM 3 HYSTERESIS 1410 1411

Part No HA031861 Issue 3 July 14 53

P304c Controller User Manual

Mnem. Parameter Modbus Jbus Range

Pi.vAL

PRIMARY PRESSURE INPUT VALUE

1114 1115 Note:

When an error is detected on measure the "data" field contains one of these error codes:

30002 (7532h): Open 30003 (7533h): Wrong zero measure 30011 (753Bh): Overload or short-circuit on strain gage

power supply 30013 (753Dh): Wrong span measure

Si.vAL

SECONARY PRESSURE INPUT VALUE

1116 1117 Note:

30002 (7532h): Open 30003 (7533h): Wrong zero measure 30011 (753Bh): Overload or short-circuit on strain gage

power supply 30013 (753Dh): Wrong span measure

Lo.C

ZERO CALIBRATION 1200 1201 1 = start the zero calibration; allow at least 5 seconds to

complete the calibration procedure. The progress and the result of calibration is available in the “Input calibration status” variable.

2 = restore the default value for zero calibration. The write of ‘0’ to this address is allowed and has no effect. Note: Writing 1 is possible only in normal operative mode

Lo.2.C

ZERO CALIBRATION FOR SECONDARY INPUT

1226 1227 1 = start the zero calibration; allow at least 5 seconds to

complete the calibration procedure. The progress and the result of calibration is available in the “Input calibration status” variable.

2 = restore the default value for zero calibration The write of ‘0’ to this address is allowed and has no effect. Note: Writing 1 is possible only in normal operative mode

Hi.C

SPAN CALIBRATION 1201 1202

1 = start the span calibration (see “Zero calibration” variable)

2 = restore the default value for span calibration The write of ‘0’ to this address is allowed and has no effect. Note: Writing 1 is possible only in normal operative mode

Hi.2.C

SPAN CALIBRATION FOR SECONDARY INPUT

1227 1228

1 = start the span calibration (see “Zero calibration” variable)

2 = restore the default value for span calibration The write of ‘0’ to this address is allowed and has no effect. Note: Writing 1 is possible only in normal operative mode

tUne

TUNE 1013 1014 Read value:

0 = inactive 1 = tune, filter compute 2 = tune, step response 3 = adaptive Write value: 0 = Smart function inactive 1 = Smart function active

Pb

PROPORTIONAL BAND 1205 1206

Ti

INTEGRAL TIME

1206 1207 1000 = integral action disabled

Td

DERIVATIVE TIME

1208 1209

iP

INTEGRAL PRE LOAD

1210 1211

oP.Hi

CONTROL OUTPUT LIMITER

1328 1329

Ctr.t

TYPE OF CONTROL 1212 1213 0 = Proportional + Integral

1 = Proportional + Integral + Derivative

Ctr.FL

FILTER FOR DISPLAY AND CONTROLLER

1214 1215 0 = 0 s (no filter)

1 = 0.5 s 2 = 1 s 3 = 2 s 4 = 4 s 5 = 8 s 6 = 16 s

ASb

AUTOMATIC STAND-BY

1223 1224 0: function disabled

54 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

Mnem. Parameter Modbus Jbus Range

1: function enabled

ASb.PL

AUTOMATIC STAND-BY PRESSURE LOW LIMIT

1224 1225

ASb.rT

AUTOMATIC STAND-BY RECOVERY TIME

1225 1226 61: no timeout applied

A1.FL

ALARM 1 FILTER 1217 1218 0 = 0 s (no filter)

1 = 0.4 s 2 = 1 s 3 = 2 s 4 = 3 s 5 = 4 s 6 = 5 s

A2.FL

ALARM 2 FILTER 1218 1219

A3.FL

ALARM 3 FILTER 1219 1220

ro.FL

RETRANSMISSION OUTPUT FILTER

1222 1223

At.StP

STEP FOR TUNE FUNCTION 1203 1204

At.iP

AUTOMATIC SELECTION OF THE INTEGRAL PRE LOAD VALUE

1211 1212 0 = manual selection

1 = automatic selection

At.AFL

AUTOMATIC SELECTION OF THE FILTER TIME CONSTANT

1213 1214 0 = manual selection

1 = automatic selection before Tune operation

SP.rr

SET POINT RAMP 1417 1418

At.t0

PROCESS TIME DELAY 1900 1901

At.Pt

PROCESS TIME CONSTANT 1901 1902

At.PG

PROCESS GAIN 1902 1903

At.t1

START TIME OF TUNE FUNCTION

1903 1904

At.t2

STOP TIME OF TUNE FUNCTION

1904 1905

At.AdS

ADAPTIVE STEP 1906 1907

Part No HA031861 Issue 3 July 14 55

P304c Controller User Manual

Configuration Parameters

Code Description Modbus Jbus Range

P1 PRESSURE INPUT

SELECTION

1500 1501 0 = strain gage

1 = 0-20 mA 2 = 4-20 mA 3 = 0-5 V 4 = 0-10 V

P2 PRESSURE INPUT

ENGINEERING UNIT

1339 1340 Off

kg/cm

2

psi bar MPa

P3 PRESSURE INPUT FULL

SCALE VALUE

1301 1302 The permissible write value depends from the previously

sent pressure input multiplier:

Multiplier Full scale value Permissible variable value

1 2 5 10 20 50

10.. 4000

4002.. 8000

8005..20000

20010..40000

40020..80000

80050..99950

10..4000

2001..4000

1601..4000

2001..4000

1601..1999

P4 PRESSURE INPUT LOW

SCALE VALUE

1302 1303

P5 PRESSURE INPUT DECIMAL

POINT POSITION

1303 1304 Decimal figures assigned to pressure input full scale value,

displayed input variable, instantaneous input variable, operative set point value, peak value, deviation value, set point, remote set point input range low, remote set point input range high, retransmission output range low, retransmission output range high, set point limit low, set point limit high, set point ramp, secondary pressure input full scale value, primary input pressure value, secondary input pressure value.

P6 PRESSURE INPUT FAIL SAFE 1403 1404 0 = high

1 = low

P6 is used to determine the alarm action in the event of loss of the sensor (for example, the sensor becomes disconnected). The action is best described in the table (using Alarm 1 as the example):

P6 Alarm 1 (set by P62) Alarm state

Hi Hi On

Lo Hi Off

Hi Lo Off

Lo Lo On In all cases the display will indicate OPEn.

P7 SHUNT CALIBRATION 1400 1401 0 = shunt calibration disabled

1 = shunt calibration enabled

P8 SHUNT VALUE 1401 1402

P9 PRESSURE INPUT DISPLAY

UPDATE TIME

1426 1427 0 = 0.050 s

1 = 0.100 s 2 = 0.250 s 3 = 0.400 s

P11 SECONDARY INPUT

SELECTION

1502 1503 0 = input disabled

1 = 0-20 mA 2 = 4-20 mA 3 = 0-5 V 4 = 0-10 V 5 = strain gauge

P12 SECONDARY INPUT

FUNCTION

1507 1508 0 = remote setpoint

1 = second sensor for differential pressure measurement

P19 SECONDARY INPUT FULL 1340 1341

56 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

SCALE VALUE

P20 SECONDARY INPUT LOW

SCALE VALUE

1341 1342

P21 SECONDARY INPUT FAIL

SAFE

1404 1405 0 = high

1 = low

P22 REMOTE SET POINT INPUT

RANGE LOW

1304 1305

P23 REMOTE SET POINT INPUT

RANGE HIGH

1305 1306

P24 SECONDARY INPUT

SAMPLE TIME

1427 1428 0 = 0.050 s

1 = 0.100 s 2 = 0.250 s 3 = 0.400 s

P35 CONTROL OUTPUT

SELECTION

1503 1504 1 = 0/20 mA

2 = 4/20 mA 3 = 0/10 V 4 = -10/10 V 5 = 0/5 V

P36 CONTROL OUTPUT RANGE

LOW

1327 1328

P37 CONTROL OUTPUT RANGE

HIGH

1328 1329

P38 CONTROL OUTPUT

DECIMAL POINT POSITION

1329 1330

P39 CONTROL OUTPUT

MANUAL MODE INDICATION

1420 1421 0 = percentage

1 = RPM

P40 DIRECT/REVERSE

SELECTION FOR CONTROL OUTPUT

1421 1422 0 = reverse + direct

1 = reverse + reverse 2 = direct + direct 3 = direct + reverse

P55 RETRANSMISSION OUTPUT

SELECTION

1504 1505 0 = output disabled

1 = 0/20 mA 2 = 4/20 mA 3 = 0/10 V 4 = -10/10 V 5 = 0/5 V

P56 RETRANSMISSION OUTPUT

RANGE LOW

1330 1331

P57 RETRANSMISSION OUTPUT

RANGE HIGH

1331 1332

P61 ALARM 1 INPUT CHANNEL

LINK

1311 1312 0 = alarm disabled

1 = process alarm 2 = band alarm 3 = deviation alarm

P62 ALARM 1 TYPE 1312 1313 0 = high alarm

1 = low alarm 2 = low alarm with mask at start-up

P63 ALARM 1 RESET MODE 1407 1408 0 = automatic reset

1 = manual reset

P64 ALARM 1 FAILSAFE MODE 1423 1424 0: failsafe mode

1: non-failsafe mode

P65 ALARM 2 INPUT CHANNEL

LINK

1313 1314 As P61

P66 ALARM 2 TYPE 1314 1315 As P62

P67 ALARM 2 RESET MODE 1409 1410 As P63

P68 ALARM 2 FAILSAFE MODE 1424 1425 As P64

P69 ALARM 3 INPUT CHANNEL

LINK

1315 1316 As P61

Part No HA031861 Issue 3 July 14 57

P304c Controller User Manual

P70 ALARM 3 TYPE 1316 1317 As P62

P71 ALARM 3 RESET MODE 1411 1412 As P63

P72 ALARM 3 FAILSAFE MODE 1425 1426 As P64

P81 LOGIC INPUT

CONFIGURATION This parameter configure the

logic input on terminals 23 and 24

1413 1414 0 = input disabled

1 = alarm reset 2 = peak reset 3 = alarm and peak reset 4 = zero calibration 5 = zero calibration, alarm and peak reset

P82 LOGIC INPUT STATUS 1414 1415 0 = input active when contact is closed

1 = input active when contact is open

P83 PEAK DETECTION 1415 1416 0 = disabled

1 = peak high 2 = peak low

P84 LINE FREQUENCY 1422 1423 0 = 50 Hz

1 = 60 Hz 2= Auto

P85 LINE FREQUENCY READOUT 1428 1429 0 = 50 Hz

1 = 60 Hz 2 = Undefined line frequency: default 50Hz 3 = Undefined line frequency: default 60Hz

P86 MANUAL/AUTO START UP 1334 1335 0 = start-up in automatic mode

1 = start-up in manual mode

P87 MANUAL/AUTO TRANSFER 1416 1417 0 = without set point modification

1 = with set point modification

P91 SERIAL COMMUNICATION

INTERFACE ADDRESS

1335 1336 0 = serial communication interface disabled

1..255 = serial communication interface address Note: The changes related to serial communication interface

parameters will be effective after the end of the reply’s transmission.

P92 PROTOCOL TYPE 1336 1337 0 = Modbus

1 = Jbus

P93 COMMUNICATION TYPE 1337 1338 0 = 8 bit

1 = 8 bit + even parity bit 2 = 8 bit + odd parity bit

P94 COMMUNICATION BAUD

RATE

1338 1339 0 = 600 baud

1 = 1200 baud 2 = 2400 baud 3 = 4800 baud 4 = 9600 baud 5 = 19200 baud

P98 LEVEL 2 PASS CODE 2003 2004

P99 CONFIGURATION PASS

CODE

2004 2005

rEc.L

RECOVERY POINT 2100 2101

58 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

10.4 Other Parameters

Code Description Modbus Jbus Range

Alarm 1 Status 1008 1009 0: no alarm condition

1: alarm condition

Alarm 2 Status 1009 1011

Alarm 3 Status 1011 1012

Auto/manual selection 1104 1105 0 = selection from front panel or serial communication

1 = selection from rear terminal block

Displayed input variable (PV) 1000 1001 When an error is detected on measure the "data" field

contains one of these error codes: 30002 (7532h): Open 30003 (7533h): Wrong zero measure 30011 (753Bh): Overload or short-circuit on strain gage

power supply 30013 (753Dh): Wrong span measure

Instantaneous input variable 1001 1002

Primary input pressure value 1114 1115

Secondary input pressure

value

1115 1116

Alarm and peak reset 2101 2102 1 = alarm reset

2 = peak reset 3 = alarm and peak reset The write of ‘0’ to this address is allowed and has no effect.

Automatic/manual mode

status

1014 1015 0 = automatic mode

1 = manual mode

Peak Value 1002 1003 When an error is detected on measure the "data" field

contains one of these error codes: 30002 (7532h): Open

Part No HA031861 Issue 3 July 14 59

P304c Controller User Manual

11. Appendix B TECHNICAL SPECIFICATION

General

Environmental performance

Temperature limits

Operation: 0 to 50°C (32 to 122°F),

Storage: -20 to 70°C (-4 to 158°F)

Humidity limits Max 85% non-condensing

Storage: RH: 5 to 90% non-condensing

Altitude <2000 metres (6562ft). Atmospheres Not suitable for use in explosive or

corrosive atmospheres.

Electromagnetic compatibility (EMC)

Emissions and

immunity

EN61326-1 Suitable for light industrial

as well as heavy industrial environments.

Electrical safety

EN61010 Installation category II; Pollution

degree 2

Installation

category II

The rated impulse voltage on nominal

230V supply is 2500V

Pollution degree 2 Normally only non conductive

pollution occurs. Occasionally, however, a temporary conductivity caused by condensation may be expected.

Physical

Case

PC colour black, self-extinguishing

degree V0 according to UL94.

Dimensions DIN 43700 96x96mm

Panel mounting

1/4 DIN

Weight 650 grams Panel cut-out 92 x 92mm Panel depth 128 mm Rear terminals Screw terminals with safety cover

Keypad and Display

Keypad Five pushbuttons membrane Display LED

Upper digits

Green colour, 5 numeric digits, 7

segments with decimal point, 13.3 mm high

Lower digits Amber colour, 5 numeric digits, 7

segments with decimal point, 10.7 mm high

Bar graph Green colour, 35 segment with 3%

resolution. Display continuous to indicate the measured variable (0-100% full scale. Alarm set point values displayed. First segment blinks for pressure lower than zero. Last segment blinks for pressure greater than full scale value.

Status beacons Units, outputs, alarms, active setpoint

Approvals

Agency cUL Self certification CE

Transmitter Power Supply (TPSU)

Isolation isolated from inputs and outputs Output Voltage 24Vdc, +/-2%; 1.5W for two or four

wire transmitters (optional).

Power Supply requirements

High voltage 100 to 230Vac, +/-15%

50 to 60Hz

Low voltage 24Vac, (14 to 32Vac) 50/60Hz

24Vdc, (14 to 32Vdc) +5% ripple voltage,

Power consumption

22VA max at 50Hz, 27W max at 60Hz. 18VA max at 24Vac; 12W max at 24Vdc.

Pressure Input

Primary input keyboard selectable between strain

gauge and linear.

Linear input selectable 0-5Vdc, 0-10Vdc, 0-20mA, 4-

20mA.

Input impedance

< 10 Ω for linear current input > 165 kΩ for linear voltage input.

Input protection open circuit detection for strain gauge

(on signal and excitation wires) and 4-20 mA inputs; not available for 0-5Vdc, 010Vdc and 0-20mA. Keyboard programmable

Sampling time 50 ms typical.

50 ms typical is also valid for the

differential pressure input.

Display update time

selectable 50, 100, 250 or 400 ms

Engineering units

dedicated beacons within the display window.

Calibration mode

Field calibrations (zero and span) are applicable for both strain gauge and linear input. Field calibration can be deleted and original factory values restored.

Input resolution 4000 counts.

Full scale value Resolution 10/4000 1 count 4002/8000 2 counts 8005/20000 5 counts 20010/40000 10 counts 40020/80000 20 counts 80050/99950 50 counts

Decimal point: Settable in any position of the display

Digital Inputs

Fixed input. Terminals 23 and 24

One input from contact closure (voltage free). Keyboard programmable for alarm reset, peak reset, alarm and peak reset, zero calibration of the primary input, zero

calibration of the primary input + alarm +

peak reset.

Access to parameters by front keyboard

is inhibited while zero calibration is running. The reset functions (peak and alarm) are level-triggered; i.e. reset is active as long as the contact is closed. The zero calibration function is edgetriggered; i.e. calibration is started at contact closure.

DIG1 to DIG4 Opto-isolated with respect to the CPU

and analogue inputs

Analogue Input Common Specification

Common mode rejection ratio

> 120 dB @ 50/60 Hz

Normal mode rejection ratio

> 60 dB @ 50/60 Hz

60 Part No HA031861 Issue 3 July 14

P304c Controller User Manual

Strain gauge input

from 340 to 5000 ohm, 1-4 mV/V. Excitation 10V +/- 7%. 5 wire connection. Interfacing 1mV/V sensors could worsen the noise performance

Input signal -25/125% of full scale (approximately -

10/50mV

Shunt calibration

with or without shunt resistor (programmable 40.0 to 100.0%) - main and secondary inputs when differential pressure measurement is selected.

Zero balance

+ 25% of full scale (approx. + 10mV)

Reference

accuracy

+/- 0.1% fsv +/- 1 digit @ 25 +/- 1 °C and

nominal power supply voltage

Temperature drift operational

< 300 ppm/K of full span for current, voltage and strain gauge input

Zero and span calibration

For differential inputs, there is no relation between the calibration of the two single sensors; each input is provided with its own zero and span calibration parameters.

Wiring caution The analogue input lines cannot exceed

the 30 meter length or exit the building.

Alarms

Alarm outputs 3 standard alarms AL1 and AL2

contacts

1 SPDT 2 A max @ 240VAC resistive load

AL3 contacts: 1 SPST solder jumper selectable NO/NC

2 A max @ 240VAC resistive load

Contact protections

Varistor for spikes protection.

Type Each alarm is keyboard programmable

for

- Process variable / Deviation / Band

- High / Low / Low masked on start up

- Auto / Latching reset mode

Excitation type Keyboard configurable for each alarm:

relay coil energized in no alarm condition (failsafe) or relay coil energized in alarm condition (non-failsafe).

Threshold From 0 to 110% Full Scale (the threshold

may be limited due to the selected full scale value).

Hysteresis Keyboard programmable for each alarm;

from 0.1% to 10.0% of span or 1 LSD (whichever is greater) for each alarm.

Filter Selectable from the following values for

each alarm OFF, 0.4, 1, 2, 3, 4, 5 sec.

Update time At every input conversion

Modbus Serial Communications

Interface Optional, EIA-485 type, opto-isolated Protocol type Modbus/Jbus (RTU mode). Type of

parameters

Run-time and configuration. Both are available by serial link

Configuration software

Through a dedicated PC software

application package Device address From 1 to 255 Baud rate: 600 up to 19200 baud Format 1 start bit, 8 bit with/without parity, 1

stop bit Parity Even/Odd

Analogue Output Control

Isolation Opto-isolated from CPU, input and

output circuits

Type of output Keyboard selectable:-

•

0/10 VDC min. load 5 kohm

•

-10/+10 VDC min. load 5 kohm

• 0/5 VDC min. load 5 kohm

• 0/20 mA max. load 500 ohm

•

4/20 mA max. load 500 ohm

Resolution 0.1% in manual mode, 0.03% in

automatic mode

Scaling The output control value may be

displayed in two modes

- from 0.0 to 100.0 % (0.1% resolution)

- from a low to a high limits selectable

from -10000 to 10000

Output limits From 0 to 100 % of full scale; no under-

range or over-range is allowed

Analogue Output Retransmission

Isolation Opto-isolated from CPU input and

output circuits

Type of output Keyboard selectable:-

• 0/10 VDC min. load 5 kohm, with

under/over-range capability from -2.5 to 12.5 V.

• -10/+10 VDC min. load 5 kohm, with

under/over-range capability from -

12.5 to 12.5 V.

• 0/5 VDC min. load 5 kohm, with

under/over-range capability from -

1.25 to 6.25 V.

• 0/20 mA max. load 500 ohm, with

under/over-range capability from -5 to 25 mA (max. load 400 ohm over 20 mA).

• 4/20 mA max. load 500 ohm, with

under/over-range capability from 0 to 24 mA (max. load 400 ohm over 20

mA).

Resolution

0.1% of output span.

Scaling Low and high limits are freely selectable

from 0 to pressure input full scale value. This allows direct or reverse output type.

Filter

Selectable from the following values for

each alarm OFF, 0.4, 1, 2, 3, 4, 5 sec.

Analogue Output Common Specification

Reference accuracy

+/- 0.1% of output span @ 25 +/- 1°C and nominal line voltage

Linearity error

< 0.1% of output span

Output noise < 0.1% of output span

Control Algorithm

Type PID plus Integral Preload plus Anti Reset

Windup.

Output value indication

Selectable between the following modes

- range 0/100.0%.

- scaleable with two proper values for RPM indication In automatic mode both modes are available (not at the same time).

In manual mode a parameter is provided

to select the first or second method of

indication.

Tune algorithm

Two types selectable

- one shot self tune

- adaptive

Automatic stand-by

This function avoids overshoot due to temporary process interruptions (PV

goes to zero).

Part No HA031861 Issue 3 July 14 61

P304c Controller User Manual

12. Index

Alarms

Band ................................................................................. 24

Deviation ......................................................................... 25

Process ............................................................................ 23

Alarms: ...................................................................................... 23

Ambient temperature ......................................................... 4, 14

Analogue .................................................................................. 10

Auto mode ................................................................................ 22

Calibration ............................ 16, 27, 44, 45, 46, 47, 48, 49, 50

Cleaning .................................................................................... 14

Conductive pollution .............................................................. 14

Control Type ............................................................................ 29

DC .............................................................................................. 36

diagnostic mode ...................................................................... 15

Digital Communications ................................. 3, 23, 28, 38, 43

Digital Input ........................................................................ 11, 18

EIA485 ......................................................... 3, 13, 28, 38, 43, 51

Electromagnetic compatibility .............................................. 14

Electrostatic .............................................................................. 14

EMC ....................................................................................... 4, 14

end ............................................................................................. 45

fuse .............................................................................................. 7

Grounding ................................................................................ 14

humidity ................................................................................ 4, 14

Input .......................................... 8, 9, 30, 31, 32, 36, 47, 48, 49

Input Type ................................................................................. 32

Installation......................................................................... 3, 4, 14

Integral ................................................................................ 40, 41

Internet Site

UK ........................................................................... 4, 13, 43

Isolation Boundaries ................................................................. 6

latching ears ............................................................................... 4

Level 1 .......................................................................... 16, 17, 21

Level 1 Parameters

ALARM 1 THRESHOLD ........................ 17, 19, 23, 24, 25

ALARM 2 THRESHOLD ..................................... 17, 19, 23

ALARM 3 THRESHOLD ..................................... 17, 19, 23

ALARMS MASK RESET ...................................... 17, 19, 26

PRIMARY PRESSURE INPUT VALUE ....................... 17, 20

SECONDARY PRESSURE INPUT VALUE ................ 17, 20

SETPOINT ......................... 15, 16, 17, 19, 24, 25, 28, 40

Level 2 Parameters

ADAPTIVE STEP .............................................................. 21

ALARM 1 FILTER ............................................................. 20

ALARM 1 HYSTERESIS ...................................... 19, 24, 25

ALARM 1 THRESHOLD ........................ 17, 19, 23, 24, 25

ALARM 2 FILTER ............................................................. 20

ALARM 2 HYSTERESIS ................................................... 19

ALARM 2 THRESHOLD ..................................... 17, 19, 23

ALARM 3 FILTER ............................................................. 20

ALARM 3 HYSTERESIS ................................................... 19

ALARM 3 THRESHOLD ..................................... 17, 19, 23

ALARMS MASK RESET ...................................... 17, 19, 26

AUTO/MANUAL SELECTION........................... 17, 18, 19

AUTOMATIC SELECTION OF THE FILTER TIME

CONSTANT ..................................................................... 21

AUTOMATIC SELECTION OF THE INTEGRAL PRE

LOAD VALUE ................................................................... 21

AUTOMATIC STAND-BY ......................................... 20, 42

AUTOMATIC STAND-BY PRESSURE LOW LIMIT 20, 42

AUTOMATIC STAND-BY RECOVERY TIME ................. 20

CONTROL OUTPUT LIMITER......................................... 20

DERIVATIVE TIME ............................................................ 20

FILTER FOR DISPLAY AND CONTROLLER .................. 20

INTEGRAL PRE LOAD ..................................................... 20

INTEGRAL TIME ..................................................20, 41, 42

LOCAL/REMOTE SET POINT SELECTION ........... 16, 19

PRIMARY PRESSURE INPUT VALUE ....................... 17, 20

PROCESS GAIN ............................................................... 21

PROCESS TIME CONSTANT.......................................... 21

PROCESS TIME DELAY ................................................... 21

PROPORTIONAL BAND ................................................. 20

SECONDARY PRESSURE INPUT VALUE ............... 17, 20

SET POINT LIMIT HIGH ............................................ 17, 19

SET POINT LIMIT LOW ................................................... 19

SET POINT RAMP ............................................................ 19

SETPOINT ......................... 15, 16, 17, 19, 24, 25, 28, 40

SPAN CALIBRATION ................................................ 20, 27

SPAN CALIBRATION FOR SECONDARY INPUT . 20, 27

START TIME OF TUNE FUNCTION ............................... 21

STEP FOR TUNE FUNCTION ......................................... 20

STOP TIME OF TUNE FUNCTION ................................ 21

TIME OF TUNE FUNCTION .................................... 20, 21

TUNE ................................................................................. 20

TYPE OF CONTROL ........................................................ 20

ZERO CALIBRATION ................................................ 20, 27

ZERO CALIBRATION FOR SECONDARY INPUT . 20, 27

Logic .................................................................................... 30, 36

Manual ........................................ 12, 15, 18, 19, 22, 30, 36, 37

Modbus .................................................................... 3, 13, 38, 43

Mounting ..................................................................................... 4

Open .......................................................................................... 16

Order Code ............................................................................. 5, 7

Panel ............................................................................................. 4

Panel retaining clips .................................................................. 4

Personnel ................................................................................... 14

Pollution ..................................................................................... 14

Power Supply .............................................................................. 7

Recovery ............................................................................. 30, 39

Recovery Point .......................................................................... 39

Relay ....................................................................... 14, 23, 28, 35

Reset ................................................................ 11, 15, 23, 35, 36

Resistor ............................................................................. 8, 9, 27

Retransmission.............................................................10, 30, 34

RTD ...................................................................................... 44, 45

Safety .......................................................................................... 14

Scroll........................................................................................... 15

Sensor Input ............................................................................... 8

Spacing ........................................................................................ 4

Specification…………………………………………………59

start up ..................................................... 17, 19, 26, 35, 37, 42

Terminal ....................................................................................... 6

Thermocouple ................................................................... 44, 45

Transmitter .............................................................................. 8, 9

Tuning ........................................................................................ 42

Wire Sizes .................................................................................... 6

Wiring.................................................................................... 6, 14

62 Part No HA031861 Issue 3 July 14

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HA031861/3 (CN31918) P304c User Manual

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