User manual METER
User manual
METER
WW-30
•
•
•
Firmware: v.5.18 or higher
Input type: 0/4-20 mA, 0/1-5V, 0/2-10V
Low-cost, no keyboard
Read the user's manual carefully before starting to use the unit or software.
Producer reserves the right to implement changes without prior notice.
2012.08.24
WW-30_INSHAEN_v.2.05.000
User manual for - METER WW-30
CONTENTS
1. BASIC REQUIREMENTS AND USER SAFETY........................................................................................3
2. GENERAL CHARACTERISTICS................................................................................................................4
3. TECHNICAL DATA......................................................................................................................................4
4. DEVICE INSTALLATION............................................................................................................................6
4.1. UNPACKING.......................................................................................................................................6
4.2. ASSEMBLY........................................................................................................................................6
4.3. CONNECTION METHOD...................................................................................................................8
4.4. MAINTENANCE................................................................................................................................12
5. DESCRIPTION OF IR REMOTE CONTROLLER AND CONTROL SOFTWARE PUSH-BUTTONS.....12
6. PRINCIPLE OF OPERATION...................................................................................................................13
6.1. MEASUREMENT MODE..................................................................................................................13
6.2. DETECTION OF THE PEAK VALUES............................................................................................14
7. DEVICE PROGRAMMING.........................................................................................................................14
7.1. PROGRAMMING MENU..................................................................................................................15
7.2. PARAMETERS EDITION.................................................................................................................15
7.2.1. Numeric parameters (digit change mode)...............................................................................15
7.2.2. Numeric parameters (slide change mode)..............................................................................16
7.2.3. Switch parameters (“LIST” type).............................................................................................16
7.3. MENU DESCRIPTION.....................................................................................................................17
7.3.1. “inPt” menu..............................................................................................................................17
7.3.2. ”bri” parameter.........................................................................................................................22
7.3.3. ”HOLd” menu...........................................................................................................................23
7.3.4. ”Scod” parameter....................................................................................................................23
7.3.5. ”rS” menu.................................................................................................................................23
7.3.6. ”Edit” parameter......................................................................................................................24
7.3.7. ”dEFS” parameter....................................................................................................................24
7.3.8. ”SErv” menu............................................................................................................................24
7.4. MENU STRUCTURE........................................................................................................................25
8. OVER-CURRENT PROTECTION.............................................................................................................26
9. DISPLAYED VALUES CALCULATION....................................................................................................26
9.1. ADDITIONAL CALCULATIONS (USED CONVERSION CHARACTERISTIC)...............................26
9.1.1. Linear characteristic................................................................................................................27
9.1.2. Square characteristic..............................................................................................................27
9.1.3. Square root characteristic.......................................................................................................28
9.1.4. User defined characteristic.....................................................................................................28
9.1.5. Volume characteristics of a cylindrical tank............................................................................29
9.2. EXAMPLES OF CALCULATIONS...................................................................................................30
10. THE MODBUS PROTOCOL HANDLING...............................................................................................34
10.1. LIST OF REGISTERS....................................................................................................................35
10.2. TRANSMISSION ERRORS DESCRIPTION..................................................................................37
10.3. EXAMPLES OF QUERY/ANSWER FRAMES...............................................................................37
11. DEFAULT AND USER'S SETTINGS LIST.............................................................................................40
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User manual for - METER WW-30
Explanation of symbols used in the manual:
!
- This symbol denotes especially important guidelines concerning the installation and
operation of the device. Not complying with the guidelines denoted by this symbol
may cause an accident, damage or equipment destruction.
IF THE DEVICE IS NOT USED ACCORDING TO THE MANUAL THE USER IS
RESPONSIBLE FOR POSSIBLE DAMAGES.
i
- This symbol denotes especially important characteristics of the unit.
Read any information regarding this symbol carefully
1. BASIC REQUIREMENTS AND USER SAFETY
!
- The manufacturer is not responsible for any damages caused by
inappropriate installation, not maintaining the proper environmental
conditions and using the unit contrary to its assignment.
- Installation should be conducted by qualified personnel . During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- GND input of device should be connected to PE wire;
- The unit must be properly set-up, according to the application. Incorrect
configuration can cause defective operation, which can lead to unit damage or
an accident.
- If in the case of a unit malfunction there is a risk of a serious threat to the
safety of people or property additional, independent systems and
solutions to prevent such a threat must be used.
- The unit uses dangerous voltage that can cause a lethal accident. The unit
must be switched off and disconnected from the power supply prior to
starting installation of troubleshooting (in the case of malfunction).
- Neighbouring and connected equipment must meet the appropriate standards
and regulations concerning safety and be equipped with adequate overvoltage
and interference filters.
- Do not attempt to disassemble, repair or modify the unit yourself. The unit
has no user serviceable parts. Defective units must be disconnected and
submitted for repairs at an authorized service centre.
!
- In order to minimize fire or electric shock hazard, the unit must be protected
against atmospheric precipitation and excessive humidity.
- Do not use the unit in areas threatened with excessive shocks, vibrations, dust,
humidity, corrosive gasses and oils.
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User manual for - METER WW-30
!
- Do not use the unit in areas where there is risk of explosions.
- Do not use the unit in areas with significant temperature variations, exposure to
condensation or ice.
- Do not use the unit in areas exposed to direct sunlight.
- Make sure that the ambient temperature (e.g. inside the control box) does not
exceed the recommended values. In such cases forced cooling of the unit must
be considered (e.g. by using a ventilator).
!
The unit is designed for operation in an industrial environment and must
not be used in a household environment or similar.
2. GENERAL CHARACTERISTICS
The WW-30 is a simple digital panel indicator, equipped with two measurement inputs.
One current input (0-20/4-20mA) and one voltage input (0-5/1-5/0-10/2-10V). Current input has
additionally overcurrent protection circuit, which protects standard resistor.
The selection of active input is realised by software, and selected input can be changed
at any time. Additionally the WW-30 allows user to select a conversion characteristic of several
kinds: linear, square, square root, and user defined (max.20 points length). Result is showed
on 4-digit LED display. Displayed values range can be selected by user, from -999 to 9999,
plus decimal point. Device WW-30 is equipped with RS-485 / Modbus RTU communication
interface .
The measurement range, active input and other parameters can be selected while
ordering. The device can be configured via IR remote controller or, optionally by PC via
RS-485 interface, or using simple RS-232 to IR converter. Moreover communication interface
RS-485 enables data transmission in any monitoring system equipped witch Modbus RTU
protocol.
Easy assembling, small dimensions, precision and reliability are the basic trumps of WW-30
indicators.
IR remote controller is not a part of the WW-30 and must be ordered separately.
3. TECHNICAL DATA
Power supply voltage
(depending on version)
External fuse (required)
Power consumption
230V AC ±10%; 50 ÷ 60 Hz (separated)
or 110V AC ± 10%, 50 ÷ 60 Hz (separated)
or 10...24...30V DC (not separated)
T - type, max. 2 A
max. 1,5 VA @ 230V AC and @ 110V AC
max. 1 W @ 24V DC
Current input
0÷20 mA, 4÷20 mA overload protected,
maximum input current about 50 mA
Current measurement accuracy
± 0,1% @ 25°C; ± one digit (for 0÷20 mA range)
Current input resistance
~ 50 Ω
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User manual for - METER WW-30
Voltage input
0÷5 V, 1÷5 V, 0÷10 V, 2÷10 V
Voltage measurement accuracy
± 0,1% @ 25°C; ± one digit (for 0÷10 V range)
Voltage input resistance
~ 100 kΩ
Temperature stability
50 ppm / °C
Display range
-999 ÷ 9999, plus decimal point
Accepted prolonged input overload: 20%
Communication interface
RS 485, 8N1 and 8N2, Modbus RTU, not separated
Baud rate
1200 bit/s ÷ 115200 bit/s
Display
LED, 4 digit, 13mm height, red
Data memory
non-volatile memory, EEPROM type
Protection level
IP 65 (from front - option, IP 40 - standard)
IP 20 (housing and connection clips)
Housing type
Housing material
Housing dimensions
panel
NORYL UL94V-0
for 24V DC version: 72 x 36 x 77 mm
for 230V AC version: 72 x 36 x 94 mm
Mounting hole
Assembly depth
67 x 32,5 mm
for 24V DC version: min. 78 mm
for 230V AC version: min. 95 mm
Panel thickness
max. 5 mm
Operating temperature
(depending on version)
0°C to +50°C
or -20°C to +50°C
Storage temperature
(depending on version)
-10°C to +70°C
or -20°C to +70°C
Humidity
Altitude
5 to 90% no condensation
up to 2000 meters above sea level
Screws tightening max. torque
Max. connection leads diameter
Safety requirements
0,5 Nm
2,5 mm2
according to: PN-EN 61010-1
installation category: II
pollution degree: 2
voltage in relation to ground: 300V AC
EMC
!
insulation resistance: >20MΩ
insulation strength between power supply and
input/output terminal: 1min. @ 2300V
according to: PN-EN 61326-1
This is a class A unit. In housing or a similar area it can cause radio
frequency interference. In such cases the user can be requested to use
appropriate preventive measures.
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User manual for - METER WW-30
4. DEVICE INSTALLATION
The unit has been designed and manufactured in a way assuring a high level of user
safety and resistance to interference occurring in a typical industrial environment. In order to
take full advantage of these characteristics installation of the unit must be conducted correctly
and according to the local regulations.
!
- Read the basic safety requirements on page 3 prior to starting the installation.
- Ensure that the power supply network voltage corresponds to the nominal
voltage stated on the unit’s identification label.
- The load must correspond to the requirements listed in the technical data.
- All installation works must be conducted with a disconnected power supply.
- Protecting the power supply clamps against unauthorized persons must be
taken into consideration.
4.1. UNPACKING
After removing the unit from the protective packaging, check for transportation damage. Any
transportation damage must be immediately reported to the carrier. Also, write down the unit
serial number on the housing and report the damage to the manufacturer.
Attached with the unit please find:
- user’s manual,
- warranty,
- assembly brackets - 2 pieces.
4.2. ASSEMBLY
!
- The unit is designed for mounting inside housings (control panel, switchboard)
insuring appropriate protection against surges and interference. Metal housings
must be connected to ground in a way that complies with the governing
regulations.
- Disconnect the power supply prior to starting assembly.
- Check the connections are wired correctly prior to switching the unit on.
!
6
In order to install the unit, a 67 x 32.5 mm mounting hole (Figure 4.1) must be
prepared. The thickness of the material of which the panel is made must not exceed
5mm. Place the unit in the mounting hole inserting it from the front side of the panel,
and then fix it using the brackets (Figure 4.2). The minimum distances between the
centre points of multiple units - due to the thermal and mechanical conditions of
operation - are 91 mm x 57mm (Figure 4.3).
User manual for - METER WW-30
a)
66,5 mm
8 mm
8 mm
32,5 mm
8 mm
8 mm
1 mm
1 mm
68 mm
32,5 mm
b)
max. 5 mm
max. 5 mm
Figure 4.1. Mounting hole dimensions: a) recommended b) allowable
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User manual for - METER WW-30
8,5 mm
16 mm
92 mm
5 mm
12 mm
10 mm
Figure 4.2. Installing of brackets, and dimensions of connectors.
57 mm
91 mm
Figure 4.3. Minimum distances when assembly of a number of units
4.3. CONNECTION METHOD
Caution
!
- Installation should be conducted by qualified personnel . During installation all
available safety requirements should be considered. The fitter is responsible for
executing the installation according to this manual, local safety and EMC
regulations.
- The unit is not equipped with an internal fuse or power supply circuit breaker.
Because of this an external time-delay cut-out fuse with minimal possible nominal
current value must be used (recommended bipolar, max. 2A) and a power supply
circuit-breaker located near the unit. In the case of using a monopolar fuse it must
be mounted on the phase cable (L).
- The power supply network cable diameter must be selected in such a way that in
the case of a short circuit of the cable from the side of the unit the cable shall be
protected against destruction with an electrical installation fuse.
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User manual for - METER WW-30
!
- Wiring must meet appropriate standards and local regulations and laws.
- In order to secure against accidental short circuit the connection cables must be
terminated with appropriate insulated cable tips.
- Tighten the clamping screws. The recommended tightening torque is 0.5 Nm.
Loose screws can cause fire or defective operation. Over tightening can lead to
damaging the connections inside the units and breaking the thread.
- In the case of the unit being fitted with separable clamps they should be inserted
into appropriate connectors in the unit, even if they are not used for any
connections.
- Unused clamps (marked as n.c.) must not be used for connecting any
connecting cables (e.g. as bridges), because this can cause damage to the
equipment or electric shock.
- If the unit is equipped with housing, covers and sealing packing, protecting
against water intrusion, pay special attention to their correct tightening or clamping.
In the case of any doubt consider using additional preventive measures (covers,
roofing, seals, etc.). Carelessly executed assembly can increase the risk of electric
shock.
- After the installation is completed do not touch the unit’s connections when it is
switched on, because it carries the risk of electrical shock.
Due to possible significant interference in industrial installations appropriate measures
assuring correct operation of the unit must be applied. To avoid the unit of improper
indications keep recommendations listed below.
–
Avoid common (parallel) leading of signal cables and transmission cables together with
power supply cables and cables controlling induction loads (e.g. contactors). Such cables
should cross at a right angle.
–
Contactor coils and induction loads should be equipped with anti-interference protection
systems, e.g. RC-type.
–
Use of screened signal cables is recommended. Signal cable screens should be
connected to the earthing only at one of the ends of the screened cable.
–
In the case of magnetically induced interference the use of twisted couples of signal
cables (so-called “spirals”) is recommended. The spiral (best if shielded) must be used
with RS-485 serial transmission connections.
–
In the case of measurement or control signals are longer than 30m or go outside of the
building then additional safety circuits are required.
–
In the case of interference from the power supply side the use of appropriate antiinterference filters is recommended. Bear in mind that the connection between the filter
and the unit should be as short as possible and the metal housing of the filter must be
connected to the earthing with largest possible surface. The cables connected to the filter
output must not run in parallel with cables with interference (e.g. circuits controlling relays
or contactors).
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User manual for - METER WW-30
Connections of power supply voltage and measurement signals are executed using the
screw connections on the back of the unit’s housing.
max. 2 mm
6-7 mm
Figure 4.4. Method of cable insulation replacing and cable terminals
0/1 - 5V
0/2 - 10V
+
GND
1 2 3 4 5 6 7 8 9 10
Power
supply
n.c.
(depending on version)
DATADATA+
GND
RS - 485
n.c.
+
GND
0-20mA
4-20mA
Figure 4.5. Terminals description
!
All connections must be made while power supply is disconnected !
a)
L
1
N
2
+
-
1
2
+
-
FUSE
FUSE
L
b)
N
230V AC
24V DC
Figure 4.6. Connection of power supply
a) for 230V AC version; b) for 24V DC version
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User manual for - METER WW-30
24V DC
6 7 8 9 10
-
+
+
-
Figure 4.7. Connection of 2-wire current converters
24V DC
-
6 7 8 9 10
-
+
+
Figure 4.8. Connection of 3-wire current converters
24V DC
-
6 7 8 9 10
+
-
+
+
Figure 4.9. Connection of voltage converters
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User manual for - METER WW-30
4.4. MAINTENANCE
The unit does not have any internal replaceable or adjustable components available to
the user. Pay attention to the ambient temperature in the room where the unit is operating.
Excessively high temperatures cause faster ageing of the internal components and shorten the
fault-free time of unit operation.
In cases where the unit gets dirty do not clean with solvents. For cleaning use warm water with
small amount of detergent or in the case of more significant contamination ethyl or isopropyl
alcohol.
!
Using any other agents can cause permanent damage to the housing.
Product marked with this symbol should not be placed in municipal waste. Please
check local regulations for disposal and electronic products.
5. DESCRIPTION OF IR REMOTE CONTROLLER AND CONTROL
SOFTWARE PUSH-BUTTONS
infra-red
transmitter
ESC
MENU
ENTER
programming pushbuttons
Symbols and functions of push-buttons:
ESC
MENU
ENTER
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Symbol used in the manual: [ESC/MENU]
Functions:
• Enter to main menu ( press and hold by at least 2 sec.)
• Exit the current level and Enter to previous menu (or measure mode)
• Cancel the changes made in parameter being edited
Symbol used in the manual: [ENTER]
Functions:
• Start to edit the parameter
• Enter to the sub-menu,
• Confirmation of changes made in parameter being edited
User manual for - METER WW-30
Symbol used in the manual: [^] [v]
Functions:
• Change of the present menu,
• Modification of the parameter value,
• Change of the display mode.
6. PRINCIPLE OF OPERATION
After turning the power supply on, device ID and software version are showed on the
display, next the controller goes to the measurement mode.
6.1. MEASUREMENT MODE
In the measure mode, the measurement results, converted over selected characteristic,
are displayed on the LED display. The measurement range equal to the nominal range is
called: nominal measurement range, and the measurement range equal to the extended
nominal range is called: permissible measurement range (Figure 6.1, 6.2).
”Lo r” parameter
”Hi r” parameter
nominal measurement range
4 mA
20 mA
permissible measurement range
Figure 6.1. Definitions of measurement ranges in mode 4 ÷ 20mA
If the result of measurement exceeds the permissible measurement range, warning ”-Hi-” or
”-Lo-” is displayed rather than input signal, depends on exceeded value (see description of
“Lo r” i “Hi r” parameters, paragraph ”inPt” menu).
”Hi r” parameter
nominal measurement range
0 mA
20 mA
permissible measurement range
Figure 6.2. Definitions of measurement ranges in mode 0 ÷ 20mA
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If the measurement value do not exceeds permissible measurement range but
displayed value exceeds range -999 ÷ 9999, the warning ”-Ov-” is displayed rather
than the calculated result.
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User manual for - METER WW-30
Input type, range of displaying values, characteristic of conversion, decimal point
position and measure filtering ratio, are user configurable parameters. All accessible
parameters can be changed by entering the menu (see: DEVICE PROGRAMMING). Use the
local keyboard or the remote controller to do it. (Note: all parameters can be remote changed
via RS-485 interface).
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Configuration of the device (via menu or RS 485 interface) do not stops measures.
6.2. DETECTION OF THE PEAK VALUES
The WW-30 controller is equipped with peaks detection function. It can detect a peaks of
the input signal and display their values. Presets connected with this function are placed in
”HOLd” menu (see description of ”HOLd” menu). The detection of the peak can be done if
the measured signal raises and drops of value at least equal to parameter ”PEA”. Detected
peaks are displayed during the time defined by parameter ”timE”. If a new peak will be
detected while one is displayed, this new peak will be displayed and display time counter will
be cleared (Figure 6.3). If no peaks are detected while time ”timE” elapses, device starts to
show the current value of input signal again. If „HdiS”=”HOLD” then setting parameter
"timE"=0.0 causes holding peak value until [ESC] button is pressed. If „HdiS”=”rEAL” then
value "timE"=0.0 means no holding. Displaying peak value is signalized by flashing most right
decimal point.
measure
”timE”
”timE”
”PEA”
”PEA”
real measurement result
display value
time
Figure 6.3. Process of peaks detection
7. DEVICE PROGRAMMING
The device menu allow user to set all parameters connected to operation of
measurement input, control modes, critical situations behaviour, communication via RS-485
and access settings. The meaning of the particular parameters is described in paragraph
MENU DESCRIPTION.
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User manual for - METER WW-30
7.1. PROGRAMMING MENU
To enter main menu (being in the measurement mode) operator must to press and hold
at least 2 sec. [ESC/MENU] button.
If the user password is defined (see parameter “Scod“), operator have to enter correct
one before proceeding to menu options . Entering of the passwords is similar to the edition of
numeric parameters (see: PARAMETERS EDITION ), however presently editing digit is showed
only on the display, other digits are replaced by “-” sign.
After entering of last digit of the password first menu position will be displayed (if the password
is correct) or warning ”Err” in other case.
Functions of the buttons while sub-menu and parameters choice:
Selection of sub-menu or parameter for editing. Name of selected item (submenu or parameter) is displayed.
ENTER
Operation of [ENTER] button depend on present menu position:
• if the name of some sub-menu is displayed - enter this sub-menu; name
of the first parameter (or next level sub-menu) is displayed,
• if the name of some parameter is displayed - enter the edition of this
parameter; present value of the parameter is displayed,
MENU
[ESC/MENU] button allow user to exit present menu level and goes to upper
level menu (or measurement mode).
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After about 1 min. since last use of the buttons, device exits the menu mode and
returns to the measurement mode (only if no parameters are in editing mode).
ESC
7.2. PARAMETERS EDITION
To start edition of any parameter user should select name of desired one using [^] [v]
buttons and then press [ENTER].
7.2.1. Numeric parameters (digit change mode)
Numerical parameters are displayed as decimal numbers. The mode of its new value
entering depends on chosen edit method ( see parameter „Edit”).
In mode “by digit” („Edit”=”dig”) pressing one of the keys [^] or [v] causes change of
current position (flashing digit) or the sign (+/-). Short pressing of the [ENTER] button causes
change of the position (digit).
Press [ENTER] at least 2 seconds to accept the changes, after that question ”SEt?” is
displayed, and user must to confirm (or cancel) the changes. To conform changes (and story it
in EEPROM) press [ENTER] button shortly after ”SEt?” is displayed. To cancel the changes
press [ESC] button shortly after ”SEt?” is displayed. After that device returns to the menu.
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User manual for - METER WW-30
7.2.2. Numeric parameters (slide change mode)
In “slide change” mode („Edit”=”Slid”), buttons [^] and [v] has different functions.
To increase edited value press (or press and hold) [^] button only, the increasing
became quickest as long as button [^] is pressed. To slow down the increasing, button [v] can
be used. If [v] is pressed shortly (and button [^] is still pressed), increasing slow down for
a moment only, if [v] is pressed and held while button [^] is still pressed the increasing slow
down and will be kept on lower speed.
To decrease edited value press (or press and hold ) [v] button only. The decreasing
became quickest as long as button [v] is pressed. To slow down the decreasing, button [^]
can be used. If [^] is pressed shortly (and button [v] is still pressed), decreasing slow down for
a moment only, if [^] is pressed and held while button [v] is still pressed the decreasing slow
down and will be kept on lower speed.
Press [ENTER] at least 2 seconds to accept the changes, after that question ”SEt?” is
displayed, and user must to confirm (or cancel) the changes. To conform changes (and story it
in EEPROM) press [ENTER] button shortly after ”SEt?” is displayed. To cancel the changes
press [ESC] button shortly after ”SEt?” is displayed. After that device returns to the menu.
7.2.3. Switch parameters (“LIST” type)
Switch parameters can be described as a sets of values (a lists) out of which only one of
the options available on the list can be selected for the given parameter. Options of switching
parameter are selected using [^], [v] keys.
Short pressing of [ENTER] causes in displaying of the acknowledge question (”SEt?”). If
key [ENTER] is pressed again, the changes are accepted, stored in EEPROM end the edition
process finished. Pressing the key [ESC] after ”SEt?” causes in cancelling of made changes
and returning to menu.
Functions of buttons when editing numeric and switching parameters:
While editing numeric parameter:
• change of current (flashing) digit
• slide change of value (acceleration, deceleration, direction change)
While editing switch parameter - selection of switch parameter.
ENTER
ESC
MENU
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If numerical parameter is being edited, a short press of [ENTER] button
change edited position. A long press of [ENTER] button (at lest 2 sec.)
causes of display a ”SEt?” ask, which allow user to make sure if change of
the parameter value is correct. If switch parameter is being edited, a short
press of [ENTER] button causes of display a ”SEt?” ask. When [ENTER]
button is pressed again (while ”SEt?” is displayed) the new value of the
parameter is stored in EEPROM memory.
Pressing this button operator can cancel the changes done up to now (if they
were not approved by [ENTER] button after the ”SEt?” ask) and come back
to menu
User manual for - METER WW-30
7.3. MENU DESCRIPTION
“- - - -”
- password checking. If some password different from „0000” is set, then every
enter to main menu follows the entering of password. If entered password is
correct then first menu position will be displayed else warning ”Err”, and unit
returns to measurement mode.
Due to problem with direct displaying of “m” letter, it is exchanged with special sign
“
“. Independently in user manual letter „m” is used to make it more readable
(example: “modE”).
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7.3.1. “inPt” menu
This menu presets the measurement input:
“tYPE" - type of the input / sensor. This parameter can be set to values:
”0-20”, “4-20” - current inputs.
”0-10”, “2-10”, ”0-5”, “1-5” - voltage inputs.
Displayed values are defined by parameters “Lo C”,”Hi C” (or by user defined
characteristic points) and parameter ”Pnt”.
”CHAr”
- this option presets type of the conversion characteristic, and can be set to:
”Lin”
“Sqr”
“Sqrt”
- linear
- square
- square root
When one of those characteristics is chosen display
range is defined by “Lo C” and “Hi C”.
“USEr”
- user defined characteristic. Maximal length 20 points. Every point is
defined by user. Adding, Editing and Deleting of points is done by options
„AddP”, „EdtP”, „dELP” („InPt” menu) respectively.
“tn v”
- volume characteristics of a cylindrical tank in the vertical position,
determined by parameters: „t h1”, ”t h2”, „t h3”, „t d”, „t Sn”, „t Sh” in „InPt”
menu (see below for details of the parameters),
- volume characteristics of a cylindrical tank in the horizontal position,
determined by parameters: „t h1”, ”t h2”, „t h3”, „t d”, „t Sn”, „t Sh” in „InPt”
menu (see below for details of the parameters).
“n h”
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If user defined characteristic is selected, and if number of defined points is lower
than 2 then warning ”Errc” is displayed in measurement mode.
The process of displayed result calculation is described in details in DISPLAY VALUES
CALCULATION paragraph.
”FiLt”
”Pnt”
- this parameter sets filtration rate. It can be set to values from 0 (no filtration ) to 5
(strongest filtration – time window about 2 sec).
- decimal point position. It can be set to one of:
“
0”, “ 0.0”, “ 0.00”, “0.000”
Decimal point position is changed by [^], [v] buttons.
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User manual for - METER WW-30
“Lo C”
“Hi C”
These parameters describe the values displayed for minimum and maximum input
current. For example, if input type is set to 4-20 mA “Lo C” parameter defines the
value displayed when input current is equal 4 mA, and “Hi C” parameter defines
the value displayed for 20 mA of input current. Available range for these
parameters: -999 ÷ 9999. Negative values can be set by entering '-' sign on the first
position (by use of [^], [v] buttons).
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If volume characteristics of a cylindrical tank is selected (parameter “CHAr” = ”tn
v” or “CHAr” = ”tn h”) the parameters „Lo C” and „Hi C” are not available.
„t h1”, „t h2”, „t h3”, „t d” - the parameters defining shape of cylindrical tank
(Figure 7.1 and Figure 7.2).
a) for the cylindrical tank in the vertical position:
„t h1”
- the height of the bottom part of a tank (in the elliptic paraboloid shape), this
parameter has the fixed precision - 2-decimal point,
„t h2”
- the height of the middle part of a tank in the cylindrical shape, this parameter has
the fixed precision - 2-decimal point,
„t h3”
- the height of the top part of a tank (in the elliptic paraboloid shape), this
parameter has the fixed precision - 2-decimal point,
„t d”
- the diameter of the middle part of a tank, this parameter has the fixed precision - 2-decimal point,
b) for the cylindrical tank in the horizontal position:
„t h1”
- the length of the left bottom of a tank (in the elliptic paraboloid shape), this
parameter has the fixed precision - 2-decimal point,
„t h2”
- the length of the middle part of a tank in the cylindrical shape, this parameter has
the fixed precision - 2-decimal point,
„t h3”
- the length of the right bottom of a tank (in the elliptic paraboloid shape), this
parameter has the fixed precision - 2-decimal point,
„t d”
- the diameter of the middle part of a tank, this parameter has the fixed precision - 2-decimal point,
„t Sn”, „t Sh” - parameters defining the length and position of the sensor used to measure
level of liquids, gases or solids in the tank (Figure 7.1, 7.2).
„t Sn”
- distance between end of the sensor and bottom of the tank, this parameter has
the fixed precision 2-decimal point but the unit is 100 times smaller than “t Sh”
(see Info below),
„t Sh”
- the measuring range, this parameter has the fixed precision - 2-decimal point.
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User manual for - METER WW-30
i
•
•
•
•
•
The unit value of “t Sn” parameter is 100-fold less than the unit value of
other parameters defining cylindrical tank, i.e. if we set value 10.00 in
“t Sh” parameter and set value 08.00 in "t Sn" parameter this mean that
value of “t Sn” parameter is real has 00.08 value in preserved unit of the
“t Sh” parameter.
If we set parameters of tank in [m] unit (“t Sn” parameter takes [cm] unit
respectively, see above), than displays the result the volume of the tank in
[m3] unit, if we set parameters of tank in [cm] unit (“t Sn” parameter takes
[mm] unit respectively, see above), than displays the result the volume of
the tank in [cm3] unit.
"t Sh" parameter may be greater than height (for vertical position) or
diameter (for horizontal position) of the tank, which means that the total
volume of the tank can be achieved by eg. such middle-current range,
If the measurement value do not exceeds permissible measurement range
but displayed value exceeds range of 9999 than you can move to the right
position of the decimal point if it is still possible (see parameter Menu>”inPt”->”Pnt”).
If in the volume characteristics of a cylindrical tank is exceeded the value
of the volume of the tank sets by parameters available in menu "inPt"
instead of the calculated result will be display warning “-Hi-”.
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User manual for - METER WW-30
t h3
t Sh
t h2
td
h~I[mA]
t Sn
t h1
Figure 7.1 Parameters of cylindrical tank in vertical position.
t Sh
t h1
t h2
td
h~I[mA]
t Sn
Figure 7.2 Parameters of cylindrical tank in horizontal position.
20
t h3
User manual for - METER WW-30
i
If user defined characteristic is selected (parameter “CHAr” = ”USEr”) the
parameters „Lo C” and „Hi C” are not available for modification, due to their values
are calculated from defined characteristic.
“AddP”
- this menu allow user to add single point to the user defined characteristic.
After selection of this option device waits for „X” and „Y” coordinates of new point.
Modification of the coordinates is done accordingly to numerical parameters edition.
Coordinate „X” defines the percentage ratio of input current to selected current
range. The „X” range: -99,9 ÷ 199,9. Coordinate „Y” defines displayed value for
particular „X” value. The „Y” value can be changed in range: -999 ÷ 9999, decimal
point position depend on „Pnt” parameter (menu ”inPt ”).
i
•
•
•
User can not enter two points with the same value of „X” coordinate. If user trays
to do it, ”Err” warning is displayed. To modify any defined point use ”EdtP”
option.
To distinguish „X” and „Y” coordinates, if „X” coordinate is displayed an
additional decimal point on utmost right position is displayed.
If user defined characteristic is selected, and if number of defined points is lower
than 2 then warning ”Errc” is displayed in measurement mode.
“dELP”
- this option allows user to delete any of the points of the user defined
characteristic. After selection current number of points of the user defined
characteristic is displayed for about approx. 1.5 sec. After that device waits for
selection of point being deleted (by [^], [v] buttons). The short pressing of [ENTER]
button causes by switching between X and Y value of the displayed point. The long
press (press and hold at least 2 sec) of [ENTER] button causes by displaying
„dEL?” ask. If [ENTER] button is pressed again, current point is deleted and new
updated number of points of the user defined characteristic is displayed.
“EdtP”
- this option allows user to modify of particular point of the user defined
characteristic. After selection current number of points of the user defined
characteristic is displayed for about approx. 1.5 sec. After that device waits for
selection of point being edited (by [^], [v] buttons). The short pressing of [ENTER]
button causes by switching between X and Y value of the displayed point. The long
press (press and hold at least 2 sec) of [ENTER] button causes by entering to edit
the selected coordinate of the point. Modification of the coordinates is done
accordingly to numerical parameters edition.
i
“AddP”, ”dELP” and “EdtP” options are available only if the user defined
characteristic is used (it means when parameter “CHAr” = ”USEr”).
“Lo r”, ”Hi r”
- these parameters define the expansion of nominal range in percent. They
determine the permissible range of input signal (Figure 7.3).
The permissible range allow user to exceed the nominal range of input signal.
If input value is contained in the permissible range a proper result is displayed.
If input signal exceeds this range (defined by “Lo r” and “Hi r”), “-Lo-” or “Hi-” warning is displayed depend on input signal value.
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User manual for - METER WW-30
”Lo r” = 75,0% (3 mA)
”Hi r” = 5,0 % (1 mA)
nominal measurement range (4-20mA)
Imin
0
1
4
Imax
20
21
22
[mA]
permissible measurement range
display
message ”-Lo-”
measurement result is displayed
regardless on nominal range exceeding
display
message ”-Hi-”
Figure 7.3 Example of definition of permissible range of input signal “Lo r” and “Hi r” parameters (“4-20” mode)
The “Lo r” parameter is important if input is set to “4-20”, “1-5” or “2-10” mode
only, and determines lower border of the permissible range. If input is set to
“0-20”, “0-5” or “0-10” mode then lower border of the permissible range is
always 0.
For example if input is set to “4-20” mode, then lower border is calculated due to
expression:
Imin = 4 mA - 4 mA × “Lo r” %.
The “Lo r” value can be set from 0 to 99.9%.
Parameter “Hi r” determines the upper border of the permissible range accordingly
to the expression (for all modes).
For example if input is set to “4-20” mode, then upper border is calculated due to
expression:
Imax = 20 mA + 20 mA × “Hi r” %.
The value of “Hi r” can be set from 0 to 19.9%
In example no 1 of the DISPLAY VALUES CALCULATION paragraph the
procedure of the permissible input range determining is presented in details.
i
If the measurement value do not exceeds permissible measurement range but
displayed value exceeds range -999 ÷ 9999, the warning ”-Ov-” is displayed rather
than the calculated result.
7.3.2. ”bri” parameter
This parameter allows user to set bright of the LED display, bright can be set to
conventional values from 1 to 8.
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User manual for - METER WW-30
7.3.3. ”HOLd” menu
This menu contains parameters connected with peak detection function. See also full
description of the peak detection function in paragraph: DETECTION OF THE PEAK VALUES
“modE” - the type of detected changes of the input signal, can be set to values:
”norm”
”inv”
- peaks, peak and next drop of the input signal of value equal at least “PEA”,
- drops, drop and next peak of the input signal of value equal at least “PEA”,
“PEA”
- minimal detected signal change classified as peak or drop (see Figure 6.3)
“timE”
- maximum time of displaying of the peak (drop) value, can be set from 0.0 to 19.9
sec, with 0.1 sec. resolution. If „HdiS”=”HOLD” then setting parameter "timE"=0.0
causes holding peak value until [ESC] button is pressed. If „HdiS”=”rEAL” then
value "timE"=0.0 means no holding.
“HdiS”
- type of displayed values:
”rEAL”
”HOLd”
- current value is displayed,
- peak (drop) value is displayed,
7.3.4. ”Scod” parameter
This parameter defines user password (4-digits number). If this parameter is set at value
“0000”, user password is turned off.
If the user do not remember his password, the access to the menu is possible
by the “one-use password”. To get this password please contact with
Marketing Division. “Single use password” can be used only one time, after
that it is destroyed. Entering this password causes in clearing of user
password, it means sets the user password to „0000”.
i
The “one-use password” can be used ONE TIME ONLY, it is impossible to use it
again! The “one-use password” can be restored by Service Division only.
7.3.5. ”rS” menu
This menu is connected with RS-485 interface, and sets his properties:
”Addr”
- this parameter defines the address of the device, accordingly to Modbus protocol.
It can be set in range from 0 to 199. If the value 0 is set then device, responds to
frames with address 255 (FFh).
”bAud”
- this parameter determines RS-485 interface baud rate. It can be set to one of 8
possible values: ”1.2”, ”2.4”, ”4.8”, ”9.6”, ”19.2”, ”38.4”,”57.6”,”115.2”, which
respond to the baud rates of 1200, 2400, 4800, 9600, 19200, 38400, 57600 and
115200 bit/s respectively.
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User manual for - METER WW-30
”mbAc” - this parameter sets the access to the configuration registers of the device.
Possible values:
”on”
- configuration registers can be set via RS-485 interface,
”oFF”
- configuration registers can not be set via RS-485 interface.
”rESP”
- this parameter defines minimal (additional) delay between the Modbus message
and the answer of the device (received and sent via RS-485 interface). This
additional delay allows the device to work with poor RS-converters which do not
works properly on baud rates higher than 19200. This parameter can be set to one
of values:
”Std”
” 10c”
” 20c”
” 50c”
”100c”
”200c”
i
- answer as quick as possible, no additional delay
- answer delayed of 10, 20, 50, 100 of 200 chars respectively, where
one character time depends on selected baud rate
In the most cases parameter ”rESP” should be set to ”Std” (no additional delay).
Unfortunately for some third party RS-converters ”rESP” should be adjusted
experimentally. Table 7.1 contains most frequently used values.
”bAud” parameter
“38.4”
“57.6”
“115.2”
”rESP” parameter
“ 10c”
“ 20c”
“ 50c”
Tab.7.1. Settings of ”rESP” parameter
7.3.6. ”Edit” parameter
This parameter allows to change the edition mode of numerical parameters:
”dig”
- the change to “by digit” mode,
”Slid”
- slide change mode.
7.3.7. ”dEFS” parameter
This setting allows to restore the factory settings of the device. To get the access to this
option special password is required: „5465”, next the device displays acknowledge question
„SEt?”. Press [ENTER] to acknowledge the restoring of factory settings or [ESC] to cancel.
7.3.8. ”SErv” menu
This menu contains the parameters for authorized service only. To enter this menu
proper service password must be entered. Improper settings can causes of damage of the
device.
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User manual for - METER WW-30
7.4. MENU STRUCTURE
Measurement mode
ESC
MENU
Press and hold at least 2 seconds
ESC
MENU
0___
4-digit user password entering (if it is different from „0000”)
ENTER
ENTER
ESC
MENU
inPt
ENTER
tYPE
ENTER
ESC
Parameter
edition
MENU
CHAr
ESC
MENU
ENTER
bri
ESC
ENTER
Parameter
edition
ESC
ENTER
ENTER
ESC
MENU
FiLt
MENU
modE
HOLd
ENTER
ESC
Parameter
edition
MENU
Pnt
MENU
Lo C
PEA
ESC
ENTER
Scod
ENTER
ESC
MENU
Parameter
edition
Hi C
timE
MENU
AddP
Hdis
dELP
ESC
MENU
ENTER
ENTER
Addr
rS
ENTER
ESC
Parameter
edition
EdtP
MENU
bAud
Lo r
ESC
MENU
mbAc
ENTER
ESC
MENU
Edit
ESC
Parameter
edition
Hi r
rESP
MENU
4-digit special
password entering
ESC
MENU
ENTER
ENTER
0___
dEFS
MENU
ENTER
SEt?
ESC
Default settings
restoring
ESC
MENU
ESC
MENU
SErv
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User manual for - METER WW-30
8. OVER-CURRENT PROTECTION
The current input of the device is equipped with over-current protection circuit. This circuit
protects the standard resistor against damage. Maximum input current is set to about 50 mA.
When temperature of the standard resistor falls, the protection circuit will turn on automatically,
and the device will measure the input current again. Due to thermal phenomenon in the
standard resistor, precision of the measurement may be lower until to the standard resistor
temperature will falls to the environment temperature.
9. DISPLAYED VALUES CALCULATION
For simplicity of examples it's assumed that current input is selected, and all calculations
are related to this input. When voltage input is selected calculations are similar (be sure of
particular ranges and units).
The first step to compute the result of measure is the calculation of the normalized result
(it means result of 0-1 range). To do it, the begin of the input range (0 mA for 0-20mA range,
and 4mA for 4-20mA range) must be subtracted from measured value. Next, received result
must be divided by the width of the input range ( it means 20mA for 0-20mA range, and 16mA
for 4-20mA range). So normalized result can be expressed by expressions:
I inp. −4
16
I inp.
I n=
20
I n=
for
4 ÷ 20 mA range
for
0 ÷ 20 mA
range
where Iinp. Means input current (in mA), and In – normalized result.
i
If measured value exceeds the nominal input range (0-20mA or 4-20mA), and do
not exceed the permissible input range, then received normalized In result exceeds
0-1 range, e.g. input range 4-20 mA, input current = 3 mA – the normalized result is
equal -0,0625, and for input current = 22 mA, the normalized result is equal 1,125.
In such cases presented expressions are still correct.
9.1. ADDITIONAL CALCULATIONS (USED CONVERSION CHARACTERISTIC)
The manner of the additional computation of the displayed result depends on selected
conversion characteristic. All presented charts are connected with the input range 4 - 20 mA.
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User manual for - METER WW-30
9.1.1. Linear characteristic
The normalized result is converted by fixed coefficients determined by “Lo C” and “Hi C”
parameters (when the normalized results is equal 0, then value “Lo C” is displayed, and when
the normalized results is equal 1, then value “Hi C” is displayed). Expression presented below
shows the manner of result calculation:
W =I n × "Hi C" −"Lo C"   "Lo C" ,
where W means the displayed value.
The value of the “Lo C” parameter can be higher than the value of “Hi C”
parameter. In such a case, for an increasing value of input current the displayed
value decreases.
i
Lo C
Displayed
value
Displayed
value
Hi C
Hi C
Lo C
0
4
8
12
Input current [mA]
16
20
0
4
8
12
Input current [mA]
16
20
Figure. 9.1 Normal („Lo C” < ”Hi C) and inverted („Lo C” > ”Hi C) characteristic
9.1.2. Square characteristic
The normalized result is squared and further conversion is done as for linear characteristic.
Conversion is made accordingly with the expression:
2
W =I n × "Hi C" −"Lo C"   "Lo C" ,
where W means the displayed value.
Displayed
value
Lo C
Displayed
value
Hi C
Lo C
Hi C
0
4
8
12
16
Input current [mA]
20
0
4
8
12
16
Input current [mA]
20
Figure. 9.2 Normal („Lo C” < ”Hi C) and inverted („Lo C” > ”Hi C) characteristic
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User manual for - METER WW-30
9.1.3. Square root characteristic
The normalized result is rooted and further conversion is done as for linear characteristic.
Conversion is made accordingly with the expression:
W = I n × "Hi C" −"Lo C"   "Lo C" ,
where W means the displayed value.
i
Showed above expression is not valid when normalized result is negative. It is
possible for 4-20 mode only. In this case (I n<0) the displayed result is equal “Lo C”
(see graphs below).
Lo C
Displayed
value
Displayed
value
Hi C
Lo C
Hi C
0
4
8
12
16
Input current [mA]
20
0
4
8
12
16
Input current [mA]
20
Figure. 9.3 Normal („Lo C” < ”Hi C) and inverted („Lo C” > ”Hi C) characteristic
9.1.4. User defined characteristic
User defined characteristic is defined as set of X-Y points. Number of the points is variable and
may be set from 2 to 20 points which make linear segments (see graph and see Menu ”inPt”).
Due to the normalized result I n , the device computes specific segment, e.g. for characteristic
from figure below, and I n = 0,65 the segment between points X = ”50.0.” and X = ”70.0.” will
be chosen.
Let's mark those points as PL (point low) i PH (point high) - in this example PL= “50.0,” and
PH = “70.0.”, and the normalized result I n for the point PL as I p (in this example Ip = In(PL) =
0,5). The displayed result is calculated accordingly to the expression:
W = I n − I p  ×
[Y PH −Y  PL]
× 100  Y  PL
[ X PH − X  PL]
where Y(PH), X(PH), Y(PL), X(PL) mean values of X and Y coordinates of PH i PL points.
i
28
If the normalized result exceeds the user defined characteristic values, then specific
utmost segment, defined by two next points, is used for calculations. If characteristic
from figure below is used, and if In>1 then segment defined by points
X(PL) = “90.0.”, X(PH) = “100.0.” will be used.
User manual for - METER WW-30
0
Normalized measurement In (for 0-20 mA range)
0,5
0,7
0,9
0,2
0,35
1
5-elements characteristic
Displayed value
X (PH) = „70.0.”
Y (PH)
X = „35.0.”
Y (PL)
X (PL) = „50.0.”
X = „20.0.”
Prąd wejściowy [mA]
X = „90.0.”
X = „100.0.”
0
4
8
12
16
20
Input current [mA]
Figure. 9.4 Example of user defined characteristic
9.1.5. Volume characteristics of a cylindrical tank
Volume characteristics of a cylindrical tank is defined by parameters of tank (see menu
”inPt”). Normalized input is proportional to level 'h' and linear scaling by parameters: "t Sn", "t
Sh" (for normalized input value equal 0, displays value "t Sn" and for normalized input value
equal 1, displays value "t Sh"+"t Sn" (Figure 9.5).
The linear scaling can be expressed as follow:
h=In·"t Sh"+"t Sn"
where 'h' is level of liquids, gases or solids in the tank, see Figure 7.1, 7.2.
Level 'h'
”t Sh”+”t Sn”
”t Sn”
0
4
8
12
16
Input current [mA]
20
Figure 9.5 The characteristic of level of liquids, gases or solids in tank depending on input
current in 4÷20mA range.
Volume of tank can be write by general formula:
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User manual for - METER WW-30
V =∫ P p⋅dh
Possible combination of tank shape for calculation the volume:
cylindrical
tank in
vertical
position
cylindrical
tank in
horizontal
position
parameter t h2=0 t h3=0
s setting
(for vertical t h3=0
and
horizontal
position of
tank)
t h2=0
t h1=0
-
t h3=0
t h1=0
t h1=0
t h2=0
9.2. EXAMPLES OF CALCULATIONS
Example 1: Selection of the permissible input range (“4-20” mode)
If in “4-20” mode the user sets “Lo r” = 20,0% and “Hi r” = 10,0%, then permissible
input currents range will be equal: 3,2 mA ÷ 22 mA. Lower border of the range is the result of
calculations: 4 mA - 4 mA × 20%, and the higher : 20 mA + 20 mA × 10%.
Example 2: The normalized In result calculation
Let the input mode = 4-20 mA. The normalized I n result is calculated accordingly to the
expression on page 26, so if Iin = 10 mA then 10 mA - 4 mA = 6 mA, and this result should be
divided by the width of input range (16 mA). Finally the normalized result: I n = 6/16 = 0,375.
In case when input current exceeds nominal measurement range, calculations are similar. For
example if input current is equal 2,5 mA then In = (2,5 - 4)/16 ≅ -0,0938, and if input current is
equal 20,5 mA then In = (20,5 - 4)/16 ≅ 1,0313.
Example 3: The linear characteristic
Let the input mode = 4-20 mA, and parameters “Lo C” and “Hi C” equal to -300 and 1200
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User manual for - METER WW-30
respectively. The calculations will be done for three different input currents from example 2.
a) Iin =10 mA and In = 0,375
Accordingly to expression on page 27 for linear characteristic:
0,375 × [1200 -(- 300)] ≅ 562 and next, the “Lo C” value is added to the result , so the
displayed value:
W ≅ 562 + (-300) = 262
b) Iin = 2,5 mA and In = -0,0938.
W ≅ -441.
c) Iin = 20,5 mA and In = 1,0313.
W ≅ 1247.
Example 4: The square characteristic
Let the input mode = 4-20 mA, and parameters “Lo C” and “Hi C” equal to -300 and 1200
respectively. The calculations will be done for there different input currents from example 2.
a) Iin =10 mA and In = 0,375
Accordingly to expression on page 27 for square characteristic: (0,375) 2 × [1200 -(- 300)] ≅
211.
and next, the “Lo C” value is added to the result , so the displayed value:
W ≅ 211 + (-300) = -89
b) Iin = 2,5 mA and In = -0,0938.
W ≅ -287.
c) Iin = 20,5 mA and In = 1,0313.
W ≅ 1295.
Example 5: The square root characteristic
Let the input mode = 4-20 mA, and parameters “Lo C” and “Hi C” equal to -300 and 1200
respectively. The calculations will be done for there different input currents from example 2.
a) Iin =10 mA and In = 0,375
Accordingly to expression on page 28 for square root characteristic:
 0,375 × [1200 -(- 300)] ≅ 919.
and next, the “Lo C” value is added to the result , so the displayed value:
W ≅ 919 + (-300) = 619
b) Iin = 2,5 mA and In = -0,0938 , normalized result is negative , so the displayed value is equal
to “Lo C” parameter: W ≅ “Lo C” = -300.
c) Iin = 20,5 mA and In = 1,0313.
W ≅ 1223.
Example 6: The user defined characteristic
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User manual for - METER WW-30
Let the input mode = 4-20 mA, and the user selected the 10 segment characteristic. To do this
it is necessary to enter X and Y coordinates of 11 points (see Menu ”inPt”).
The calculations will be done for three different input currents from example 2, so in
calculations some of the segments will be used only.
Let the following points will be given:
X1 = “00.0.”, Y1 = “-50.0”,
X2= “10.0.”, Y2 = “-30.0”,
....
X6 = “30.0.”, Y6 = “30.0”,
X7 = “40.0.”, Y7 = “80.0”,
....
X10 = “90.0.”, Y10 = “900.0”,
X11 = “100.0.”, Y11 = “820.0”,
Additionally all other points must to be defined and stored in the device memory.
a) Iin =10 mA and In = 0,375
The segment defined by X6 = “30.0.” and X7 = “40.0.” for this In will be selected. Accordingly
to expressions given for user defined characteristic (see page 28) X6(PL) = 30, Y6(PL) = 30,
X7(PH) = 40, Y7(PH) = 80 and Ip = 0,3 , the displayed value :
W = I n − I p  ×
[Y  PH −Y PL ]
× 100  Y  PL =
[ X  PH − X  PL]
=0,375−0,3 ×
[80−30]
× 100  30 ≃ 67
[ 40−30 ]
b) Iin = 2,5 mA and In = -0,0938, because of the normalized I n value is lower than 0, the
segment defined by X1 and X2 will be selected. X1(PL) = 0, Y1(PL) = -50, X2(PH) = 10,
Y2(PH) = -30 and Ip = 0. For these values the displayed value W ≅ -69.
c) Iin = 20,5 mA and In = 1,0313. , because of the normalized In value is higher than 1, the
segment defined by X10 and X11 will be selected, and X10(PL) = 90, Y10(PL) = 900,
X11(PH) = 100, Y11(PH) = 820 and Ip = 0,9 for these values the displayed value W ≅ 795.
Example 7: Volume characteristics of a cylindrical tank in the vertical position
We assume that the user has oil tank in the shape of the cylinder located in vertical position.
The tank has dimmention: height 10m, diameter 4m and length of the sensor 10m. The output
of signal of the sensor has 4÷20mA range.
In first step, we set type of input range 4÷20mA (see parameter MENU->"InPt"->"tYPE").
Next we defined the parameters of tank dimension and location of sensor:
„t Sn”=00,00
„t Sh”=10,00
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User manual for - METER WW-30
„t h1”=00,00
„t h2”=10,00
„t h3”=00,00
„t d”=04,00
140
120
V [m3]
100
80
60
40
20
0
2
4
6
8
10
12
14
16
18
20
22
Input current [mA]
Figure 9.6 The volume characteristic of tank depending on input current in 4÷20mA range.
Example 8: Volume characteristics of a cylindrical tank in the horizontal position
We assume that the user has tank for wheat in the shape of the cylinder located in horizontal
position. The tank has dimension: height in first part is 2m, height in second part is 8.05m,
diameter 3.26m and length of the sensor 10m. The output of signal of the sensor has 4÷20mA
range.
In first step, we set type of input range 4÷20mA (see parameter MENU->”InPt”->”tYPE”).
Next we defined the parameters of tank dimension and location of sensor:
„t Sn”=00,00
„t Sh”=10,00
„t h1”=02,00
„t h2”=08,05
„t h3”=00,00
„t d”=03,26
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User manual for - METER WW-30
80
70
60
V [m3]
50
40
30
20
10
0
3
4
5
6
7
8
9
10
I [mA]
Figure 9.7 The volume characteristic of tank depending on input current in 4÷20mA range.
10. THE MODBUS PROTOCOL HANDLING
Transmission parameters: 1 start bit, 8 data bits, 1 or 2 stop bit (2 bits are send, 1 and 2 bits
are accepted when receive), no parity control
Baud rate:
selectable from: 1200 to 115200 bits/second
Transmission protocol:
MODBUS RTU compatible
The device parameters and display value are available via RS-485 interface, as HOLDINGtype registers (numeric values are given in U2 code) of Modbus RTU protocol. The registers
(or groups of the registers) can be read by 03h function, and wrote by 06h (single registers) or
10h (group of the registers) accordingly to Modbus RTU specification. Maximum group size for
03h and 10h functions can not exceeds 16 registers (for single frame).
i
34
The device interprets the broadcast messages, but then do not sends the answers.
User manual for - METER WW-30
10.1. LIST OF REGISTERS
Register
Write
Range
01h
No
-999 ÷ 9999
02h
No
The status of the current measurement; 0h - data valid; A0h - top
0h, A0h, 60h border of the measurement range is exceeded; 60h - bottom border
of the measurement range is exceeded;
03h
Yes
06h
No
10h
Yes
0÷5
“tyPE” parameter in “InPt” menu (nominal input range).
0 - 0-20 mA range; 1 - 4-20 mA range; 2 - 0-10 V range;
3 - 2-10 V range; 4 - 0-5 V range; 5 - 1-5 V range
11h
Yes
0÷3
“CHAr” parameter in “InPt” menu (characteristic type)
0 - linear ; 1 - square; 2 - square root; 3 - user defined
12h
Yes
0÷5
“FiLt” parameter in “InPt” menu (measurement filtering rate)
13h
Yes
0÷3
“Pnt ”parameter in “InPt” menu (the copy of 03h register, decimal
point position) 0 - “ 0”; 1 - “ 0.0”; 2 - “ 0.00”; 3 - “0.000”
14h
Yes
-999 ÷ 9999 “Lo C” parameter in “InPt” menu, no decimal point included
15h
Yes
-999 ÷ 9999 “Hi C” parameter in “InPt” menu, no decimal point included
16h
Yes
0 ÷ 999
“Lo r” parameter in “InPt” menu, in 0.1%
0÷3
Register description
Measurement value (no decimal point)
“Pnt ” parameter in “InPt” menu (decimal point position)
0 - “ 0”; 1 - “ 0.0”; 2 - “ 0.00”; 3 - “0.000”
-999 ÷ 9999 Peak (drop) value (no decimal point)
17h
Yes
0 ÷ 199
“Hi r” parameter in “InPt” menu, in 0.1%
20h2
Yes
0 ÷ 199
Device address
21h
No
20F2h
Device identification code (ID)
22h3
Yes
0÷7
“bAud” parameter in “rS” menu (baud rate);
0 - 1200 baud; 1 - 2400 baud; 2 - 4800 baud; 3 - 9600 baud;
4 - 19200 baud; 5 - 38400 baud; 6 - 57600 baud; 7 - 115200 baud
23h4
Yes
0÷1
“mbAc” parameter in “rS” menu (permission to write registers via
RS-485 interface); 0 - write denied ; 1 - write allowed
25h
Yes
0÷5
“rESP” parameter in “rS” menu (additional response delay);
0 - no additional delay; 1 - ”10c” option; 2 - ”20c” option;
3 - ”50c” option; 4 - ”100c” option; 5 - ”200c” option;
2Dh
Yes
1÷8
“bri” parameter (display brightness);
1 - the lowest brightness; 8 - the highest brightness
2Fh
Yes
0÷1
“Edit” parameter (numerical parameters edit mode);
0 - „dig” mode; 1 - „SLid” mode
50h
Yes
0÷1
“modE” parameter in “HOLd” menu (type of detected changes):
0 - peaks; 1 - drops
51h
Yes
0 ÷ 9999
“PEA” parameter in “HOLd” menu (minimum detectable change, no
decimal point included)
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User manual for - METER WW-30
Register
Write
Range
52h
Yes
0 ÷ 199
53h
Yes
0÷1
70h5
Yes
-999 ÷ 1999
The value of „X” coordinate of point no. 1 of the user defined
characteristic, expressed in 0.1%
71h5
Yes
-999 ÷ 9999
The value of „Y” coordinate of point no. 1 of the user defined
characteristic, no decimal point included
72h5 ÷ 95h5
2
3
4
5
36
Register description
“timE” parameter in “HOLd” menu, maximum peaks' (or drops')
display time expressed in seconds
“HdiS” parameter in “HOLd” menu:
0 - “rEAL” mode ; 1 - “HOLd” mode
Further pairs of „X” - „Y” coordinates of points no. 2 ÷ 19 of the
user defined characteristic
96h5
Yes
-999 ÷ 1999
The value of „X” coordinate of point no. 20 of the user defined
characteristic, expressed in 0.1%
97h5
Yes
-999 ÷ 9999
The value of „Y” coordinate of point no. 20 of the user defined
characteristic, no decimal point included
- after writing to register no 20h the device responds with an “old” address in the message.
- after writing to register no 22h the device responds with the new baud rate.
- the value of the “mbAc” parameter is also connected to write to this register, so it is possible to block a writes, but
impossible to unblock writes via RS-485 interface, The unblocking of the writes is possible from menu level only.
- the pairs of „X -Y” coordinates may be defined for any free point. The pair is “free” (it means that particular point is
not defined) if „X” coordinate of this point is equal 8000h. After writing both X and Y coordinate the point is defined
and used in calculation of result. The coordinates of any point can be changed at any time.
User manual for - METER WW-30
10.2. TRANSMISSION ERRORS DESCRIPTION
If an error occurs while write or read of single register, then the device sends an error
code according to Modbus RTU specifications (example message no 1).
Error codes:
01h - illegal function (only functions 03h, 06h and 10h are available),
02h - illegal register address
03h - illegal data value
08h - no write permission ( see: “mbAc” parameter)
A0h - exceed of upper border of input range
60h - exceed of lower border of input range
A0h and 60h codes can appear only during reg. 01h is reading by 03h function (read of
a single register).
10.3. EXAMPLES OF QUERY/ANSWER FRAMES
Examples apply for device with address 1. All values are represent hexadecimal.
Field description:
ADDR
Device address on modbus network
FUNC
Function code
REG H,L
Starting address (address of first register to read/write, Hi and Lo byte)
COUNT H,L
No. of registers to read/write (Hi and Lo byte)
BYTE C
Data byte count in answer frame
DATA H,L
Data byte (Hi and Lo byte)
CRC L,H
CRC error check (Hi and Lo byte)
1. Read of the displayed value (measurement), WW-30 device address = 01h:
ADDR
FUNC
01
03
REG H,L
00
01
COUNT H,L
00
01
CRC L,H
D5
CA
a) The answer (we assume that measurement is not out of range):
ADDR
FUNC
BYTE C
01
03
02
DATA H,L
00
FF
CRC L,H
F8
04
DATA H, L - displayed value = 255, no decimal point.
Decimal point position can be read from reg. 03h.
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User manual for - METER WW-30
b) The answer (if an error occur):
ADDR FUNC
01
ERROR
83
CRC L,H
60
41
18
ERROR - error code = 60h, bottom border of the measurement range is exceeded
2. Read of device ID code
ADDR
FUNC
REG H,L
01
03
00
ADDR
FUNC
BYTE C
01
03
02
COUNT H,L
21
00
CRC L,H
01
D4
00
The answer:
DATA H,L
20
CRC L,H
F2
20
01
DATA - identification code (20F2h)
3. Change of the device address from 1 to 2 (write to reg. 20h)
ADDR
FUNC
01
06
REG H,L
00
20
DATA H,L
00
02
CRC L,H
09
C1
DATA H - 0
DATA L - new device address (2)
The answer (the same as the message):
ADDR
FUNC
01
06
REG H,L
00
20
DATA H,L
00
02
CRC L,H
09
C1
4. Change of baud rate of all devices connected to the net (BROADCAST message).
ADDR
FUNC
00
06
REG H,L
00
22
COUNT H,L
00
04
CRC L,H
29
DATA H - 0
DATA L - 4, new baud rate 19200 baud
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38
Device do not reply to BROADCAST-type messages.
D2
User manual for - METER WW-30
5. Read of the registers 1, 2 and 3 in one message (example of reading a number of
registries in one frame):
ADDR
FUNC
01
03
REG H,L
00
COUNT L
COUNT H,L
01
00
03
CRC L,H
54
0B
- the count of being read registers (max.16)
The answer:
ADDR
FUNC
01
03
DATA H1, L1
DATA H2, L2
DATA H3, L3
i
BYTE C DATA H1,L1
06
00
0A
DATA H2,L2
00
00
DATA H3,L3
00
01
CRC L,H
78
B4
- reg. 01h (10 - displayed value ”1.0”),
- reg. 02h (0 - no errors),,
- reg. 03h (1 - decimal point position ” 0.0”).
There is no full implementation of the Modbus Protocol in the device. The
functions presented above are available only.
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User manual for - METER WW-30
11. DEFAULT AND USER'S SETTINGS LIST
Parameter
Description
Default value
User's value
Desc.
page
Configuration of measurement input (“inPt” menu)
tYPE
Input mode
CHAr
Conversion characteristic mode
„4-20”
17
Lin
17
FiLt
Filtering ratio
Pnt
Decimal point position
Lo C
Minimum displayed value (for nominal range)
Hi C
Maximum displayed value (for nominal range)
Lo r
Extension of the bottom of the nominal input range
Hi r
Extension of the top of the nominal input range
5.0 (%)
21
bri
Display brightness
bri6
22
0
17
0.0
17
000.0
18
100.0
18
5.0 (%)
21
Display parameters
Configuration of peaks detection function (“HOLd” menu)
modE
Kind of detected changes
norm
23
PEA
Minimum detected change
0.0
23
timE
Maximum time of peak displaying
0.0
23
HdiS
The type of displayed value
HOLd
23
RS 485 interface configuration (menu “rS”)
Addr
Device address
0
23
bAud
mbAc
Baud rate
9.6
23
Permission to changes of configuration registers
on
24
rESP
Additional delay of answer transmission
Std
24
Edit
Numerical parameters edit mode
Configuration of numerical parameters edition
40
dig
24
User manual for - METER WW-30
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User manual for - METER WW-30
42
User manual for - METER WW-30
43
APLISENS S.A. , ul. Morelowa 7
PL - 03-192 Warszawa, Poland
tel.: (+48 22) 814-07-77, fax: (+48 22) 814-07-78
http://www.aplisens.com.pl, e-mail: [email protected]
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