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 3Date 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.
2Part No HA031861 Issue 3July 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 350Ωstrain 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)
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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 –
122OF) 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)
(3)
(4)
(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
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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+
SIG-
CAL2
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+
EXC-
CAL1
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
EXC-
CAL1
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
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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
24V
53
54
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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-
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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
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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 400Ωover 20 mA).
•4/20 mA max. load 500Ω, with under/over-
range capability from 0 to 24
mA (max. load 400Ωover 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 400Ωover 20 mA).
•4/20 mA max. load 500Ω, with under/over-range capability from 0 to 24
mA (max. load 400Ωover 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
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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
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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
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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
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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:
WRefer to manual. DRisk of electric shock. OTake 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 3July 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
321
Units
kg/cm2, 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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