GESTRA Steam Systems
URB 2
Installation Instructions 81860100
Operating & display unit URB 2
1
Contents
Page
Important Notes
Usage for the intended purpose ..............................................................................................................5
Safety note .............................................................................................................................................5
ATEX (Atmosphère Explosible) .................................................................................................................5
Explanatory Notes
Scope of supply ......................................................................................................................................5
System description ............................................................................................................................. 5, 6
Function .................................................................................................................................................6
Technical Data
URB 2 .....................................................................................................................................................7
Name plate / Marking .............................................................................................................................7
Dimensions ............................................................................................................................................8
Installation
URB 2 .....................................................................................................................................................9
Functional Elements
URB 2 ...............................................................................................................................................9, 10
Key ....................................................................................................................................................... 10
Wiring
Bus cable, cable length and size ........................................................................................................... 11
Wiring the connecting sockets ..............................................................................................................11
Wiring diagram URB 2 ..........................................................................................................................11
Wiring diagram for CAN bus system – example – .................................................................................12
Attention .............................................................................................................................................. 12
Basic Settings
Factory setting ...................................................................................................................................... 12
Operation
Operator interface .................................................................................................................................13
Note .....................................................................................................................................................13
Attention .............................................................................................................................................. 13
Menus ..................................................................................................................................................14
Specification of keys and navigation wheel ..........................................................................................15
Specification of the symbol bar .......................................................................................................15, 16
Menu structure .....................................................................................................................................16
2
Contents – continued –
Page
Menu Start
Start logo .............................................................................................................................................. 17
Home ...................................................................................................................................................17
Language .............................................................................................................................................18
System configuration ............................................................................................................................18
Baud rate .............................................................................................................................................19
Brightness ............................................................................................................................................19
About URB 2 .........................................................................................................................................20
Service menu .......................................................................................................................................20
Service – Lock URB ..............................................................................................................................20
Service – Unlock URB ...........................................................................................................................21
Service – Key check .............................................................................................................................22
Menu Control
At a glance ...........................................................................................................................................22
Control .................................................................................................................................................23
Overview ........................................................................................................................................24, 25
Status report ........................................................................................................................................25
Sensitivity ............................................................................................................................................. 26
Measuring range ..................................................................................................................................26
Switchpoints ........................................................................................................................................ 27
Switchpoints, proportional range ..........................................................................................................28
Switchpoints, output 4-20 mA ..............................................................................................................28
Switching times ................................................................................................................................... 29
Control valve ........................................................................................................................................30
Control param .......................................................................................................................................31
Temperature ......................................................................................................................................... 31
Blowdown valve ...................................................................................................................................32
MIN/Blowdown .....................................................................................................................................33
Menu Limiter
Limiter .................................................................................................................................................. 34
Note .....................................................................................................................................................34
Control unit .......................................................................................................................................... 35
Limiter Lx .............................................................................................................................................35
Malfunctions
Causes .................................................................................................................................................36
Systematic fault finding procedure for system malfunctions .................................................................37
Restart .................................................................................................................................................38
Status messages ..................................................................................................................................39
3
Contents – continued –
Page
Annex
CAN bus ...............................................................................................................................................40
Factory set node IDs .............................................................................................................................40
Decommissioning .................................................................................................................................40
Disposal ...............................................................................................................................................40
Declaration of Conformity .....................................................................................................................41
Glossary .......................................................................................................................................42 – 44
4
Important Notes
Usage for the intended purpose
The operating & display unit URB 2 may only be used in conjunction with GESTRA CAN bus devices.
Any type of use differing from the usage described above must be considered as improper. The resulting
risk will have to be borne by the user alone. The manufacturer hereby expressly rejects any claims for
any damage resulting from improper usage.
Safety note
The equipment must only be installed and commissioned by qualified and competent staff.
Retrofitting and maintenance work must only be performed by qualified staff who – through adequate
training – have achieved a recognised level of competence.
ATEX (Atmosphère Explosible)
According to the European Directive 94/9/EC the equipment must not be used in explosion risk areas.
Explanatory Notes
Scope of supply
URB 2
1 Operating & display unit URB 2
1 Connecting socket type M 12, with 5 poles, A-coded
1 Connecting socket type M12, with 5 poles, A-coded, with terminating resistor 120 Ω
1 Installation manual
1 Sticker with password
System description
The URB 2 is an operating & display unit for all GESTRA CAN bus devices that uses the CANopen
protocol to register all the data telegrams coming from the sensors, control units and actuators that
are provided by the CAN bus.
The following readings, parameters and settings can be displayed and – with the exception of the
actual values – also be changed by means of the URB 2.
5
Explanatory Notes – continued –
System description – continued –
Level Conductivity Temperature
Actual value bar chart X
Actual value, numerical X X X
MIN limit X X X
MAX limit X X X
Switchpoints X X X
Relay (de)energizing times X X
Actual-value output 4-20 mA X
Measuring range X X
Setpoint X X X
Control parameters X X
Valve position of level control valve X
Unit (μS/cm or ppm) X
Stand-by X
Continuous blowdown valve
Operating position of the valve
Purging pulse 24 h X
Intermittent blowdown interval X
Duration of intermittent blowdown X
Manual/Automatic operation X X
X
Function
The operating & display unit URB 2 evaluates at regular intervals the data telegrams of all sensors,
controllers and actuators in a CAN bus system. The readings, parameters, settings and messages are
indicated in plain text. When used as second water level indicator in boiler plants (TRD 401, EN 12952 /
...53), the level is also indicated in the form of a bar graph.
Several languages can be selected for plain text display.
The password protection prevents unauthorized persons from changing parameters and settings.
If other menu levels are selected via the start window and neither a button nor the navigation wheel
is then actuated, the operating & display unit URB 2 will automatically return to the start window after
5 minutes. The time-out function is not effective during manual operation or in the parameterization
mode.
The help function in the various operating levels offers additional information on how to operate the
equipment.
6
Technical Data
Betriebsanleitung beachten
See installation instructions
Voir instructions de montage
GESTRA AG Münchener Straße 77 D-28215 Bremen
URB 2
Input/output
CAN bus interface with power supply 18-36 V DC, short circuit protected
Data exchange
CAN bus to ISO11898, CANopen protocol
Indicators and adjustors
1 Graphic display, resolution 320 x 240 pixels, illuminated
4 Pushbuttons
1 Control knob with integrated pushbutton (navigation wheel)
Wiring
2 Connecting sockets type M 12, with 5 poles, A-coded
Power consumption
5.2 VA
Protection
Front face: IP 54 to EN 60529
Rear panel: IP 10 to EN 60529
Admissible ambient temperature
0 – 55°C
Case materials
Front face: Ultramid A3K
Enclosure: Sheet metal type DC01-A, surface yellow chromatized
Weight
approx. 1.1 kg
Name plate / Marking
Equipment
designation
Characteristics
Output / Voltage,
current
Software version
Fig. 1
Disposal note
Protection
Pressure/temp. range
CE marking
Manufacturer
7
Technical Data – continued –
IP 54
MAX 55 °C
MAX 55 %
P
U
S
H
30
max.
1
0
E
Home Control Limiter
Level
45 %
Pressure
MAX
ACT. bar
Temperature
MAX 300
ACT. 150 °C
Conductivity StdBy
MAX 6000
ACT. 4800 µS/cm
GESTRA URB 2
180
E
F
150
54
Dimensions
Fig. 2
E
[mm]F [mm]
174 145
8
Installation
GESTRA URB 2
P
U
S
H
Home Control Limiter
Level
45 %
Conductivity StdBy
MAX 6000
ACT. 4800 µS/cm
Pressure
MAX
ACT. bar
Temperature
MAX 300
ACT. 150 °C
URB 2
The operating and display unit URB 2 is designed for installation in control cabinets.
1. Provide cut out in control cabinet, dimensions 174 x 145 mm, max. sheet thickness 10 mm.
2. Unscrew the white fixing nuts
D and remove the back of the housing C. If necessary you can also
unscrew the stud but not more than 35 mm.
3. Put the operating and display unit URB 2
A into the cut-out, replace the back of the housing C,
screw in and tighten the fixing nuts D.
Functional Elements
URB 2
A
3
Fig. 3
1 2 1
9
Functional Elements – continued –
URB 2 – continued –
Fig. 4
Key
1 Pushbutton
2 Navigation wheel
3 Illuminated LCD display, resolution 320 x 240 pixels
A Frame with indicators and adjustors
B Connector, 5poles
C Back of housing
D Fixing studs and nuts for installation in control cabinet
10
B C
D
Wiring
Bus cable, cable length and size
To connect the equipment use the supplied M12 connecting sockets.
Note that screened multi-cored twisted-pair control cable is required as Bus line,
e. g. UNITRONIC® BUS CAN 2 x 2 x ...mm² or RE-2YCYV-fl 2 x 2 x ...mm².
Control cable assemblies (cable with plug and connector) of various lengths are available as add-on
equipment.
The cable length dictates the baud rate (data transfer rate) between the bus nodes, and the total power
consumption of the sensor dictates the conductor size.
Baud rate Cable length
250 kBit/s 125 m 2 x 2 x 0.34
125 kBit/s 250 m
100 kBit/s 335 m
50 kBit/s 500 m
20 kBit/s 1000 m
10 kBit/s 1000 m
Wiring the connecting sockets
Wire the connecting sockets in accordance with the wiring diagram.
Wiring diagram URB 2
3 234512 154
6
Fig. 5
Number of pairs
and conductor size [mm²]
2 x 2 x 0.5
2 x 2 x 0.75
available on demand
(depends on bus configuration)
Key
1 Screen
2 Voltage supply
24 V DC+
3 Voltage supply
24 V DC–
4 CAN data line C
5 CAN data line C
H
L
6 Terminating resistor 120 Ω
UNITRONIC® is a registered trademark of LAPP Kabelwerke GmbH, Stuttgart.
11
Wiring – continued –
Wiring diagram for CAN bus system – example –
Central
earthing point
CEP
Operating device
URB 2
Control unit
NRS 1-4x
NRS 2-40
NRR 2-40
LRR 1-40
TRS 5-40
Level electrode
Conductivity
electrode
NRG x6-4x
LRG xx-4x
Temperature
transmitter
TRV 5-40
Connecting socket with
terminating resistor 120 Ω
Plug with terminating
resistor 120 Ω
Fig. 6
Attention
■ Wire equipment in series. Star-type wiring is not permitted!
■ Connect screens of the bus cables once to the central earthing point (CEP).
■ If two or more system components are connected in a CAN bus system, the first and
the last device must be provided with a terminating resistor of 120 Ω (terminal
CL/CH). We recommend that you use the URB 2 with a connecting socket equipped with
terminating resistor either as first or as last device.
■ Only one operating and display unit URB 2 may be used per CAN bus network.
■ The CAN bus system must not be interrupted during operation.
In the event of an interruption a malfunction alarm is raised.
■ The operating and display unit URB 2 must not be applied in parallel with the operating,
display & automatic control device SPECTORcontrol.
Basic Settings
Factory setting
Operating & display unit URB 2
The operating and display unit URB 2 unit features the following factory set default values:
■ Node ID: 60
■ Baud rate: 250 kBit/s (125 m cable length)
12
Operation
P
U
S
H
Home Control Limiter
GESTRA URB 2
Operator interface
The operating and display unit URB 2 shows parameters, operating conditions and other operating
data. The menus can be selected and all inputs can be made by using the four pushbuttons and the
navigation wheel.
The operator interface of the operating and display unit URB 2 consists of four areas:
Title bar
Display field
Symbol bar
Operating bar
The title bar lists the menus. The selected menu is highlighted by a black background. Due to the
limited space of the display not all menus can be shown.
Note
Current alarm indicators are indicated in the title bar.
The equipment that raised the alarm is flashing.
The display field changes its appearance according to the indicated menu.
The symbol bar shows the available functions of the activated menu.
The operating bar consists of four pushbuttons and a navigation wheel. The symbol bar indicates the
functions assigned to the pushbuttons and the control of the navigation wheel.
Attention
Do not press several pushbuttons at the same time or when using the navigation wheel.
Incorrect data input may occur.
To ensure correct entries press the respective pushbutton or use the navigation
wheel for one second.
13
Operation – continued –
Home Control Limiter
Level
45 %
Conductivity StdBy
MAX 6000
ACT. 4800 µS/cm
Pressure
MAX
ACT. bar
Temperature
MAX 300
ACT. 150 °C
Function
NRG 16-42 - Level
NRG 26-40 - Level
LRG 1x-4x - Conductivity
TRV 5-40 - Temperature
Status
ON
ON
ON
ON
Home Control Limiter
Home Control Limiter
Choice
Menus
The start window in the display shows all possible indications and readings. Note that the system
configuration determines what is actually indicated.
Level controller NRR 2-40, manual operation, level
45 %
Conductivity controller LRR1-40, manual operation*)
Conductivity controller LRR1-40, stand-by operation*)
Conductivity MAX limit setting 6000 μS/cm
Conductivity Actual value setting 4800 μS/cm
Temperature MAX limit setting 300°C
Temperature Actual value 150°C
*) Both indications at the same time are not possible
during operation.
1. To select a menu turn the navigation wheel to the
left or right. The selected menu is highlighted in
the title bar and the overview display of the menu
is indicated.
2. To call up the selected menu press the navigation
wheel.
3. To select the value to be set or the equipment in
question turn the navigation wheel. The selection
will be highlighted.
4. To call up the menu of the parameter or equipment
press the navigation wheel. The selected menu will
be shown.
5. Only applicable for the menu Control: To get the full
listing of all devices repeat items 3 and 4.
■ Press button to quit the currently active menu.
14
Operation – continued –
Specification of keys and navigation wheel
The functions allocated to the keys and the navigation wheel of the operating and display unit URB 2
depend on the activated menu. The allocation is shown in the symbol bar.
Press key to view the associated help text in a separate menu window.
Press button to confirm the parameter settings.
Press button for approx. 1 sec to confirm the parameter settings of values or devices. If only one
value can be changed in the menu the indicator in the parameterisation mode will go to the value to be
set.
Turn the navigation wheel to the left or to the right to select menus, devices or parameter settings. In
addition, if the symbol is shown, you can confirm this selection by pressing the navigation wheel.
To make larger modifications of the entered data more quickly use keys
rough selection. Then use these keys or the navigation wheel for the subsequent fine tuning.
To activate the manual mode of the individual devices use key . The equipment will be controlled
only by the operating and display unit URB 2 unless it is deactivated. The manual mode is indicated in
the indicating bar of the start menu by the symbol
The activation or deactivation of the password protection is indicated in the symbol bar of the start
window by
The key
cel the current modifications and to go back to the original setting. Furthermore it closes the active
submenu and opens the master menu. To return to the start menu press the key
or .
has several functions. When the parameterisation mode is active it can be used to can-
.
and
for a fairly
several times.
Specification of the symbol bar
Key Designation Function
Help Displaying help text
OK Quitting the help menu / Confirming the input
Parameter setting Parameter setting (highlighted when activated)
Navigation wheel
Navigation wheel
Turning the navigation wheel:
Navigation between windows
Moving to other parameter setting
Changing parameter settings
Turning and pressing the navigation wheel:
In master level: Calling up the menu elements
In general: Confirmation
Moving to other parameter setting
Changing parameter settings
15
Operation – continued –
Home
Limiter
Control
Choice
Language
System configuration
Baud rate
Brightness
About URB 2
Service menu
Choice
NRG 16-42 - Level
NRG 26-40 - Level
LRG 1x-4x - Conductivity
TRV 5-40 - Temperature
Choice
Device name
Service – Lock URB
Service – Unlock URB
Service – Key check
Control unit
Limiter Lx
Choice
Device name
Overview
Status report
Sensitivity
Measuring range
Switchpoints
Switching times
Control valve
Control param.
Temperature
Blowdown valve
MIN/Blowdown
Specification of the symbol bar – continued –
Key Designation Function
Menu structure
Fig. 7
16
Forward Proportional increase of values
Backward Proportional decrease of values
Manual operation Manual mode (highlighted when activated)
Disabled Password protection is turned OFF
Enabled Password protection is turned ON
Escape
Cancel input and quit menu, press the key several
times to call up the start window
Menu Start
Device: URB2
Version: 311.131.xx
Date:
July
2005
Operati
ona
l
Home Control Limiter
Level
45 %
Conductivity StdBy
MAX 6000
ACT. 4800µS/cm
Pressure
MAX
ACT. bar
Temperature
MAX 300
ACT. 150°C
Home Control Limiter
Choice
Language
System configuration
Baud rate
Brightness
About URB 2
Service menu
GESTRA
Start logo
The start logo appears for approx. 2 minutes after
restarting the equipment. During this period the
parameters of the equipment connected via CAN
bus are downloaded.
Home
The start window in the display shows all possible indications and readings. Note that the system
configuration determines what is actually indicated.
1. To select the basic settings press the navigation
wheel. The selection of the menus will be
indicated.
2. To select a menu turn the navigation wheel and
then press it to confirm the selection.
■ To choose another language select menu
Language.
■ If you want to update the node IDs of the
connected equipment or to activate equipment for
viewing select the menu System Configuration.
■ To update the baud rate select the menu Baud
Rate.
■ To change the properties of the display select the
menu Brightness.
■ To view information on the equipment select the menu About URB 2.
■ To disable equipment settings or to carry out the key test select the menu Service menu.
17
Menu Start – continued –
Language
German
English
old:
new:
Used language
Language
German
English
old:
new:
Used language
System configuration
Control (2) Limiter Others
NRS 1-40 001 OFF
NRS 1-41 006 OFF
NRS 1-40.1 001 ON
------------- 127 OFF
------------- 127 OFF
------------- 127 OFF
Language
1. To set the parameter press button
. The
activated item is highlighted in the symbol bar.
The background of the selected item is flashing.
2. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel. The flashing stops.
System configuration
The URB 2 is delivered with GESTRA set default values. Check that the node ID settings of the
connected equipment agree with the factory settings (for more information see the installation
manuals of the respective devices).
1. Turn the navigation wheel to select the equipment
group to be configured.
2. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
3. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
4. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel. The flashing stops.
5. To obtain more available elements repeat items 3 and 4 and press button
.
18
Baud rate
250kBd
125kBd
old:
new:
Used baud rate
Brightness
Background illumination
MIN MAX
Contrast of the screen
MIN MAX
Menu Start – continued –
Baud rate
1. Check the baud rate of the connected equipment.
If necessary adapt the baud rate of the URB 2 to
the baud rate setting of the CAN bus.
2. To set the parameters press button
activated item is shown in the symbol bar. The
background of the selected item is flashing.
3. To enter a new value turn the navigation wheel and
confirm the input by pressing the navigation wheel.
The flashing stops.
Note
Make sure that all bus nodes feature the same baud rate settings.
If a baud rate setting is incorrect an acoustic signal will be given.
Brightness
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel. The flashing stops.
4. To obtain more available elements repeat items 2
and 3 and press button .
. The
19
About URB 2
Device: URB2
Version: 311.131.xx
Date:
July
2005
Home Control Limiter
Service menu
Lock URB
Unlock URB
Key check
Service – Lock URB
Lock URB now?
(Yes = OK , No = ESC)
Unlocked
Status:
GESTRA
Menu Start – continued –
About URB 2
The menu About URB 2 shows the information on the
equipment.
Service menu
■ To disable the functions of the keys select the
■ To enable the function of the keys select the menu
■ To check the functions of the keys select the menu
menu Lock URB.
Unlock URB.
Key check.
Service – Lock URB
1. To disable the equipment press the navigation
wheel. The symbol “Equipment disabled” appears
in the symbol bar of the start menu.
20
Menu Start – continued –
Service – Unlock URB
Locked 000
Status:
00
Wrong input:
00 / 03 minutes
Waiting time:
–––––
Password:
Service – Unlock URB
Locked 000
Status:
00
Wrong input:
00 / 03 minutes
Waiting time:
–––––
Password:
Service – Unlock URB
Locked 000
Status:
00
Wrong input:
00 / 03 minutes
Waiting time:
–––––
Password:
Password is valid.
Status: Unlocked
Service – Unlock URB
Locked 000
Status:
00
Wrong input:
00 / 03 Minuten
Waiting time:
–––––
Password:
Password is invalid!
Try again ?
(Yes = OK , No = ESC)
Service – Unlock URB
1. To enable the functions of the keys enter your
password and press the navigation wheel. The
message whether the password is valid or invalid
will be indicated.
The password is supplied separately.
2. If the password is valid press the navigation wheel
to confirm the entry. The symbol “Equipment
enabled” appears in the symbol bar of the start
menu.
3. If the password is invalid enter the correct
password or cancel the operation. To enter the
correct password repeat items 1 and 2. Note that
the equipment remains disabled if the operation is
cancelled.
Note
After entering three incorrect passwords the equipment will interrupt the input function
for 3 minutes.
21
Menu Start – continued –
Service – Key check
Press any key ...
Service – Key check
1. To check the function of the keys press (and hold
down for some time) one key after the other. While
the key is being pressed down the respective
button will be highlighted in the display.
2. When the key is released the display goes back to
the previous mode.
3. To check the function of the navigation wheel turn
it slowly to the left and to the right. Each time an
item is activated (the snapping in place is slightly
perceptible) the symbol in the display changes its
colour.
4. Press the navigation wheel to go to the start menu
and finish the test of the keys.
Menu Control
At a glance
Status report X X X X X 25
Sensitivity X 26
Switchpoints
proportional range
Actual-value output 4-20mA
Switching times X X X 29
Measuring range X X 26
Control valve X 30
Control param. X 31
Temperature X 31
Blowdown valve X 32
MIN/Blowdown X 33
22
TRV 540
TRS 540
X
X
NRG 1642
NRS 142
NRG 2640
NRS 240
X
NRG 2640
NRR 240
X
X
LRG 1x4x
LRR 140
Page
27
28
28
Menu Control – continued –
Function
NRG 16-42 - Level
NRG 26-40 - Level
LRG 1x-4x - Conductivity
TRV 5-40 - Temperature
Status
ON
ON
ON
ON
Home Control Limiter
Home Control Limiter
Choice
NRG 16-42 - Level
NRG 26-40 - Level
LRG 1x-4x - Conductivity
TRV 5-40 - Temperature
Home Control Limiter
Choice
Device name
Control
The monitored functions together with their configuration status are indicated in the display.
1. To select the controlled variable press the
navigation wheel. The selection of the menus will
be indicated.
2. To select the desired control function turn the
navigation wheel and then press it to confirm the
selection.
3. To select the equipment turn the navigation
wheel until the desired item is marked and then
press the navigation wheel.
23
NRS 2-40
Overview Status report Measuring range
045%
1: 080 %
2: 060 %
3: 040 %
4: 020 %
LRR 1-40
Overview Status report
Control param.
µS/cm
000%
VOp.: 000 %
MAX: 6000,0
W: 5000,0
MIN: 4000,0
24h-rinsing
StdBy
NRR 2-40
Overview Status report Measuring range
XP: 020 %
X: 045 %
W: 050 %
XW: -05 %
045%
080
020
050%
Menu Control – continued –
Overview
Concerning:
■ Level control NRG 16-42 and NRS 1-42
■ Level control NRG 26-40, NRS 2-40 and
NRR 2-40
■ Conductivity control LRG 1x-4x and LRR 1-40
The menu “Overview” shows current para-
meters such as the current readings and the
adjusted limits.
Only applicable for manual operation:
1. To operate the controllers NRR 2-40 and
LRR 1-40 manually press the button “Hand”.
The activated item is shown in the symbol bar.
2. Turn the navigation wheel to the left or to the
right to OPEN or CLOSE the valve. The opening
degree of the valve is indicated and the symbol
OPEN or CLOSED is flashing.
3. Press the navigation wheel to stop the valve.
The flashing of the symbol stops.
4. Press button
Here you can choose whether the manual
operation can be deactivated and the system
can go back to normal operation or whether the
manual operation shall be continued. If manual
operation is selected the symbol “Hand” is
shown in the display.
to open the input window.
Note
When the conductivity control is switched off during stand by operation of the boiler plant
an optical signal is shown in the display. The Min/Max limits and the monitoring functions
of the equipment remain active.
For more information on standby operation (conductivity control) see chapter
Glossary page 42.
24
TRS 5-40 - Temperature switch
Overview Control Switchpoints
Channel 1:
Alarm:
Channel 2:
Control MAX:
Control MIN:
Alarm:
000 °C
000 °C
000 °C
000 °C
000 °C
000 °C
Device name
Overview Status report Measuring range
ON
––––––––––––––––
––––––––––––––––
No errors
Control unit
Device name:
SW-version:
Status:
ON
––––––––––––––––
––––––––––––––––
No errors
Electrode
Device name:
SW-version:
Status:
Control unit
Device name:
SW-version:
Status:
Device name
Overview Status report Measuring range
ON
––––––––––––––––
––––––––––––––––
No errors
ON
––––––––––––––––
––––––––––––––––
No errors
No errors
Electrode
Device name:
SW-version:
Channel 1:
Channel 2:
Menu Control – continued –
Overview – continued –
Concerning:
■ Temperature control TRV 5-40 and TRS 5-40
Status report
Concerning:
■ Level control NRG 16-42 and NRS 1-42
■ Level control NRG 26-40, NRS 2-40 and
■ Conductivity control LRG 1x-4x and LRR 1-40
■ Temperature control TRV 5-40 and TRS 5-40
NRR 2-40
The menu “Status Report” shows the current
parameters of the equipment.
Note
For a list of all status messages for the equipment refer to chapter Status messages
Control unit (see page 39).
25
Device name
Status report Sensitivity Switching times
Sensitivity
0.5 µS/cm 10 µS/cm
Device name
Status report
Measuring range
Switchpoints
Calibration
100 %
** %
0 %
Menu Control – continued –
Sensitivity
Concerning:
■ Level control NRG 16-42 and NRS 1-42
1. To set the parameters press button
activated item is shown in the symbol bar.
2. Turn the navigation wheel until the desired value
is reached. The background of the selected item
is flashing.
Press the navigation wheel to confirm the selection.
The flashing stops.
Note
. The
Measuring range
For more information on the sensitivity (conductivity level control) see chapter
Glossary page 42.
Concerning:
■ Level control NRG 26-40, NRS 2-40 and NRR 2-40
To calibrate the system you should use both values
0 % and 100 % of the liquid level.
Alternatively you can also calibrate the system using
0 % and a defined value, e. g. 50 % of the liquid level.
In this case the value 0 % must be calibrated first.
1. To calibrate the first parameter press button
.
The activated item is shown in the symbol bar.
2. For the first calibration turn the navigation wheel to
0 % liquid level and press the navigation wheel.
The background of the selected item is flashing.
3. Press the navigation wheel to confirm the selection. The flashing stops.
4. Use the navigation wheel to select 100 % liquid level or the freely adjustable liquid level and press
the navigation wheel. The background of the selected item is flashing.
5. For the calibration of 100 % press the navigation wheel to confirm.
If a value below 100 % liquid level is used for calibration select the desired value by using the
navigation wheel and press the navigation wheel to confirm your selection. The flashing stops.
26
Device name
Measuring range
Switchpoints Switching times
045%
1: 080 %
2: 060 %
3: 040 %
4: 020 %
Device name
Status report Switchpoints
Output 4-20mA
Channel 1:
Alarm:
Channel 2:
Control MAX:
Control MIN:
Alarm:
ON
000 °C
ON
000 °C
000 °C
000 °C
Menu Control – continued –
Switchpoints
Concerning:
■ Level control NRG 26-40 and NRS 2-40
Concerning:
■ Temperature control TRV 5-40 and TRS 5-40
1. To set the individual parameters press button
2. To set the desired parameter turn the navigation
3. To enter a new value turn the navigation wheel
4. To obtain more available elements repeat items 2 and 3 and press button
. The activated item is shown in the symbol
bar.
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
and confirm the input by pressing the navigation
wheel.
The flashing stops.
Note
The adjustment range of the respective switchpoint is limited by the switchpoints above
or below it as well as the 0 % and 100 % (level) values or 0°C and 650 °C (temperature).
.
27
Menu Control – continued –
Device name
Measuring range
Switchpoints Switching times
045%
1: 080 %
2: 060 %
W:050% XP:020%
3: 040 %
4: 020 %
Device name
Measuring range
Switchpoints Switching times
045%
1: 080 %
2: 060 %
W:050% XP:020%
3: 040 %
4: 020 %
Device name
Status report Switchpoints
Output 4-20mA
Channel 1:
Temperature 4mA:
Temperature 20mA:
000 °C
000 °C
Channel 2:
Temperature 4mA:
Temperature 20mA:
000 °C
000 °C
Switchpoints, proportional range
Concerning:
■ Level control NRG 26-40 and NRR 2-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel.
The flashing stops.
4. To obtain more available elements repeat items 2 and 3 and press button
Note
The adjustment range of the respective switchpoint is limited by the switchpoints above
and below it as well as 0 % and 100 %.
For more information on the proportional range Xp (capacitance level control) see
chapter Glossary page 42.
.
Switchpoints, output 420 mA
Concerning:
■ Temperature control TRV 5-40 and TRS 5-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel.
The flashing stops.
4. To obtain more available elements repeat items 2 and 3 and press button
Note
The adjustment range of the respective switchpoint is limited by the switchpoints above
and below it as well as 0°C and 650 °C.
28
.
Menu Control – continued –
Device name
Status report Sensitivity Switching times
045%
03,0 s
00,0 s
00,0 s
03,0 s
Relay
0->1
00,0 s
00,0 s
00,0 s
00,0 s
1->0
Switching times
Concerning:
■ Level control NRG 16-42 and NRS 1-42
■ Level control NRG 26-40, NRS 2-40 and
NRR 2-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation wheel.
The flashing stops.
4. To obtain more available elements repeat items 2 and 3 and press button
Note
For more information on energising and deenergising times (conductivity and
capacitance level control)
see chapter Glossary, page 42.
.
29
Menu Control – continued –
Device name
Switchpoints
Control valve
Switching times
020%
0% 100 %
CANopen actuator: NO
Control valve
Concerning:
■ Level control NRG 26-40 and NRR 2-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To select the CANopen actuator turn the naviga
tion wheel and confirm the input by pressing the
navigation wheel. The background of the selected item is flashing.
3. Turn the navigation wheel to select YES if the
control valve is fitted with a CANopen actuator or
NO if it is equipped with another type of actuator.
4. Press the navigation wheel. The flashing stops.
5. To calibrate the control valve turn the navigation wheel to the first value to be adjusted.
6. Press the navigation wheel. The background of the selected item is flashing.
7. Turn the navigation wheel to the left or to the right. The valve closes or opens.
8. Press the navigation wheel for approx. 1 sec. to stop the valve. The position of the valve is shown
in the display.
9. If necessary correct the valve position by turning the navigation wheel.
10. Once the desired position of the valve has been established press button
equipment. The value is accepted and the flashing stops.
11. For the second calibration repeat items 5 to 10 and finish the input by pressing button
12. After the calibration procedure the current position of the control valve will be indicated in the
display.
-
to calibrate the
.
30
Note
For more information on the CANopen actuator see chapter Glossary page 42.
Menu Control – continued –
Device name
Status report Control param. Temperature
µS/cm
0,5 – 6000 µS/cm
Unit:
Range:
6000,0 µS/cm
0000,0 µS/cm
0000,0 µS/cm
MAX:
W:
MIN:
000 %
000 %
Xp:
Hyst:
Device name
Status report Control param. Temperature
µS/cm
0,5 – 6000 µS/cm
Unit:
Range:
6000,0 µS/cm
0000,0 µS/cm
0000,0 µS/cm
MAX:
W:
MIN:
000 %
000 %
Xp:
Hyst:
Device name
Control param. Temperature Blowdown valve
OFF
0,0 %/°C
NaOH+H20 260µS
Stop
000,0 °C
0,000
Compensation
TK [LINEAR]:
TK [NORM]:
TK [AUTO]:
Temperature:
Cell constant:
Control param.
Concerning:
■ Conductivity control LRG 1x-4x and LRR 1-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. Turn the navigation wheel until the new value
is reached. Alternatively you can use the button
to increase the value proportionally or use
button to decrease the value.
Press the navigation wheel to confirm the selection. The flashing stops.
4. To obtain more available elements repeat items 2 and 3 and press button
Note
For more information on continuous boiler blowdown, measuring range (conductivity
control), proportional range Xp (conductivity control) and switching hysteresis Hyst
(conductivity control)
Temperature
.
see chapter Glossary page 42.
Concerning:
■ Conductivity control LRG 1x-4x and LRR 1-40
1. To set the individual parameters press button
The activated item is shown in the symbol bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel and
confirm the input by pressing the navigation wheel.
The flashing stops.
4. To obtain more available elements repeat items
2 and 3 and press button .
Note
For more information on temperature compensation (conductivity control), TK
(Linear), TK (Norm), TK (Auto)
Glossary page 42.
.
and cell constant (conductivity control) see chapter
31
Menu Control – continued –
Device name
Temperature Blowdown valveMIN/Blowdown
020%
0% 100 %
Operating position: 000 %
24h-rinsing: OFF
CANopen actuator: NO
Blowdown valve
Concerning:
■ Conductivity control LRG 1x-4x and LRR 1-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To select the CANopen actuator turn the
navigation wheel and confirm the input by
pressing the navigation wheel. The background
of the selected item is flashing.
3. Turn the navigation wheel to select YES if the
continuous blowdown valve is fitted with a
CANopen actuator or NO if it is equipped with
another type of actuator.
4. Press the navigation wheel. The flashing stops.
5. To calibrate the continuous blowdown valve turn the navigation wheel to the first value to be
adjusted.
6. Press the navigation wheel. The background of the selected item is flashing.
7. Turn the navigation wheel to the left or to the right. The valve closes or opens.
8. Press the navigation wheel to stop the valve. The position of the valve is shown in the display.
9. If necessary correct the valve position by turning the navigation wheel.
10. Once the desired position of the valve has been established press button
equipment. The value is accepted and the flashing stops.
11. For the second calibration repeat items 5 to 10 and finish the input by pressing button
12. After the calibration procedure the current position of the continuous blowdown valve will be
indicated in the display.
13. To set further parameters press button
. The activated item is highlighted in the symbol bar.
14. To set the desired parameter turn the navigation wheel and confirm the input by pressing the
navigation wheel. The background of the selected item is flashing.
15. To enter a new value turn the navigation wheel and confirm the selection by pressing the
navigation wheel. The flashing stops.
16. To obtain more available elements repeat items 13 to 15 and press button
to calibrate the
.
.
Note
For more information on the operating position of the continuous blowdown valve,
24hours purging pulse (conductivity control)
Glossary page 42.
32
and CANopen actuator see chapter
Menu Control – continued –
Device name
Temperature Blowdown valve
MIN/Blowdown
Relay 4:
MIN alarm
Blowdown interval: 001 h
Blowdown time: 03 s
Blowdown
MIN/Blowdown
Concerning:
■ Conductivity control LRG 1x-4x and LRR 1-40
1. To set the individual parameters press button
. The activated item is shown in the symbol
bar.
2. To set the desired parameter turn the navigation
wheel and confirm the input by pressing the
navigation wheel. The background of the selected
item is flashing.
3. To enter a new value turn the navigation wheel
and confirm the input by pressing the navigation
wheel. The flashing stops.
4. To obtain more available elements repeat items 2 and 3 and press button
Note
For more information on continuous boiler blowdown see chapter Glossary page 42.
.
33
Menu Limiter
Home Control Limiter
Configuration
ON B1 B2
ON B1
ON B1 B2 B3 B4
Device
NRS 1-40
NRS 1-41
NRS 1-40.1
Home Control Limiter
Choice
Device name
Limiter
The monitored equipment together with their configuration status are indicated in the display.
1. To select the equipment press the navigation
wheel. The selection of the menus will be
indicated.
2. To select the desired limiter turn the navigation
wheel and then press it to confirm the selection.
Note
The control units NRS 1-40 and NRS 1-40.1 must not be used in parallel in a CAN Bus
system.
34
Menu Limiter – continued –
Device name
Control unit Limiter L1 Limiter L2
Control unit OFF
Device name:
SW–version:
Alarm:
Status message:
No errors
Device name
Control unit Limiter L1 Limiter L2
Control unit OFF
Device name:
SW–version:
Alarm:
Status message:
No errors
Device name
Control unit Limiter L1 Limiter L2
Limiter L1 OFF
Device name:
SW–version:
Alarm:
Status messages:
Control unit
1. To switch the display on or off press button .
The button
The background of ON or OFF is flashing.
2. Turn the navigation wheel to ON or OFF. Press the
navigation wheel, the flashing will stop. The display
is switched on or off.
in the symbol bar is highlighted.
Note
For a list of all status messages for the equipment refer to chapter Status messages
Limiter (see page 39).
Limiter Lx
1. To switch the display on or off press button .
The button
in the symbol bar is highlighted.
The background of ON or OFF is flashing.
2. Turn the navigation wheel to ON or OFF. Press the
navigation wheel, the flashing will stop. The display is switched on or off.
3. Limiters that are switched on are shown in the list
“Limiters”.
Note
To ensure a quick search for malfunctions we recommend that all available limiters are
switched ON.
Should a malfunction occur check the plausibility of the system configuration.
35
Malfunctions
Causes
Malfunctions occur if CAN bus components have been mounted or configured incorrectly or if
electronic component parts are defective, or in the event of excessive heat in the equipment or
electrical interference in the supply system.
Further malfunctions are:
■ Faulty communication within the CAN-Bus system
■ Overloading of the 24 V power supply unit in the controller
Note
Before carrying out the systematic fault finding procedure please check:
Wiring:
Is the wiring in accordance with the wiring diagram?
Is the polarity of the bus line always correct?
Is the bus line of each of the end nodes provided with a 120 Ω resistor?
Node ID:
Are the node IDs set correctly?
Note that a node ID must only be used for one item of equipment!
Baud rate:
Is the length of the cable in accordance with the adjusted baud rate?
(The URB 2 gives an acoustic signal if the baud rate setting is incorrect.)
Is the baud rate the same for all devices?
36
Attention
For more information on system malfunctions refer to the installation manuals of the
connected equipment.
Malfunctions – continued –
Systematic fault finding procedure for system malfunctions
The sources of malfunctions occurring in CAN bus systems operating with several bus-based stations
must be analysed systematically since faulty components or incorrect settings can give rise to
negative interactions with intact bus devices in the CAN bus system. These unwanted interactions
can cause error messages in fully functional bus devices, which will make fault detection even more
difficult.
We recommend the following systematic fault finding procedure:
Step 1 (Start)
Detach terminal strips
in all Bus sensors.
Level electrode
Conductivity electrode
Pressure sensor
Temperature sensor
etc.
Check
Use fault-finding
list to identify
the fault(s)!
Final test
Have all faults
been eliminated?
System Fault
Use fault-finding
list to identify
the fault(s)!
Cut off power supply
to the equipment!
Step 2
Plug in terminal strip
of the sensor
of the system
e. g. NRS ...
and
NRG ... (electrodes)
Step 3
Apply mains voltage
to bus devices
of the system
e. g. NRS ...
and
NRG ...
Check next system
System O.K.
Detach terminal strips
between bus devices
of the system
e. g. NRS ...
and
NRG ...
37
Malfunctions – continued –
Device: URB2
Version: 311.131.xx
Date: August 2005
Operational
START
Restart
1. Press the navigation wheel to restart the system.
2. After the restart the start window will be dis
played.
Note
All values indicated by the URB 2 will be updated within 2 minutes.
Attention
If it is not possible to restart the system automatically interrupt the voltage supply
(unplug the connecting socket). After approx. 5 minutes re-commission the URB 2 in
accordance with the installation instructions.
-
38
Malfunctions – continued –
Status messages
TRV
TRS
NRS
NRG
NRS
NRR
NRG
Control unit
No communication X X X X X X X X X
Collective bit channel 1
T MAX exceeded X X X X X X X X X
Plausibility error X X
Electrode lost X X X X
Electrode defective X
PT 1000 defective
Sensor defective X
A/D converter X
Limiter
Faulty communication X
No communication X X X
Collective bit,
self-checking routine
T MAX exceeded X X
and 2 X
540
540
TRV
NRS
540
14x
X X X
142
NRG
1x4x
1642
240
240
2640
LRR
140
LRG
1x4x
X
Note
The system message “T MAX exceeded” is given when the ambient temperature is
excessively high. Note that the temperature of the boiler is not monitored.
If faults occur that are not listed above or cannot be corrected, please contact our service centre or
authorized agency in your country.
39
Annex
CAN bus
All devices (level, conductivity, temperature) are interconnected via CAN bus. The CANopen protocol
is used for the data exchange between the equipment groups. All devices have an electronic address
– the node ID. The four-core bus cable serves as power supply and data highway for high-speed data
exchange.
The CAN address (nodeID) can be set between 1 and 123.
The operating and display unit URB 2 has already been configured at our works for operation with
other GESTRA components and can be used straight away without having to set the node ID.
Factory set node IDs
Control Units Sensors
URB 2 ID:060
NRS 140 ID:001
NRS 141 ID:006
NRS 141.1 ID:001
NRS 142 ID:020
NRS 240 ID:039
NRR 240 ID:040
LRR 140 ID:050
Individual node IDs must be set manually in the respective equipment.
Please observe the pertinent installation instructions.
NRG 1x40 ID:002
NRG 1x41.1 ID:004
TRV 540 ID:005
NRG 1642 ID:021
NRG 2640 ID:041
LRG 1x40 ID:051
Decommissioning
First cut off power supply to the operating and visual display unit URB 2 and then remove the
connecting socket. De-install the operating and display unit.
Disposal
Dismantle the operating and display unit and separate the waste materials, using the specifications
in the table “Materials” as a reference. Electronic component parts such as the circuit board must
be disposed of separately! For the disposal of the control unit observe the pertinent legal regulations
concerning waste disposal.
40
Annex – continued –
Declaration of Conformity
We hereby declare that the operating and display unit URB 2 conforms to the following European
guidelines:
■ LV guideline 73/23/eec version 93/68/eec
■ EMC guideline 89/336/eec version 93/68/eec
This declaration is no longer valid if modifications are made to the equipment without consultation
with us.
Bremen, 1st July 2005
GESTRA AG
Dipl.-Ing. Uwe Bledschun
Head of Design Dept.
Dipl.-Ing. Lars Bohl
Quality Assurance Representative
41
Glossary
Continuous boiler blowdown (“top blowdown”):
As the boiler water evaporates, the concentration of non-volatile dissolved solids (TDS) left behind in
the boiler increases over time as a function of steam consumption. If the TDS (= total dissolved solids)
concentration exceeds the limit defined by the boiler manufacturer, foaming and priming occurs as the
density of the boiler water increases, resulting in a carry-over of solids with vapor into steam lines and
superheaters. As a consequence, the operational safety is impaired and severe damage to boiler and
tubes may occur.
To keep the TDS concentration within admissible limits, a certain portion of boiler water must be
removed continuously or periodically (by means of a blowdown valve) and fresh make-up water must
be added to the boiler feed to compensate for the water lost through blowdown.
Intermittent boiler blowdown (“bottom blowdown”):
During the evaporation process fine sludge deposits settle on heating surfaces and in the lowest part
of the steam boiler. The accumulated sludge sediments form a thermally insulating layer and can
damage the boiler walls due to excessive heat.
To perform a bottom blowdown the intermittent blowdown valve must be opened abruptly.
The resulting suction effect occurs only at the moment when the valve is being opened, the opening
time should therefore not exceed 2 seconds. Longer blowdown periods will merely waste boiler water.
The timed pulse/interval control of the intermittent blowdown valve optimises sludge removal while
minimising loss of boiler water.
Sensitivity (conductivity level control):
The level electrode NRG 16-42 works only when used in water with a minimum electrical conductivity.
If the electrical conductivity of the boiler water is < 10 μS/cm at 75 °C set the sensitivity to 0.5 μS/cm.
Operating position of the continuous blowdown valve:
It is common pratice to use the continuous blowdown valve to remove water from the boiler in order
to keep the TDS level within certain predefined limits. This means that the valve must be permanently
open so that a steady flow of water is ensured (the valve is in the operating position).
The operating position is adjustable between 0 and 25 %. For the corresponding amount of boiler
blowdown refer to the capacity charts of the continuous blowdown valve.
CANopen actuator:
The control valve is equipped with a CANopen actuator. For more information see installation manual
URZ 40.
Measuring range (conductivity control):
The measuring range setting establishes the actual value output 4-20 mA of the control equipment
LRR 1-40.
Proportional band Xp (conductivity control):
If the controller is to work as a proportional controller, the proportional band can be set between 1 and
150 %. It refers to the adjusted setpoint w. If X
controller.
Proportional band Xp (capacitance level control):
Switchpoint 2 marks the upper limit and switchpoint 3 the lower limit of the proportional band. The
difference between switchpoint 2 and switchpoint 3 gives the magnitude of the proportional range Xp.
Switching hysteresis Hyst (conductivity control):
If Xp = 0 is set, the controller is configured as 2-position controller, which means that the valve will
open if there is a positive deviation (X > w). The conductivity must then decrease until a new value
that is lower than the setpoint minus the adjusted hysteresis is reached. Once this value is reached the
valve will be motored into the operating position.
= 0 is set, the controller is configured as two-position
p
42
Glossary – continued –
Energizing times (conductivity and capacitance level control):
For each of the four output relays individual time delays for energizing and de-energizing can be set.
Standby mode (conductivity control):
To avoid loss of water, the continuous blowdown control and the programme-controlled intermittent
boiler blowdown (if activated) can be de-activated during stand-by operation or when the burner is
switched off. An external control command will be triggered and as a result the continuous blowdown
valve will be closed. During stand-by operation the MIN/MAX limits and the monitoring function remain
active.
Once returned to normal operation the continuous blowdown valve is motored into the OPERATING
position or the control position. In addition an intermittent blowdown pulse is triggered off (provided
that automatic intermittent boiler blowdown has been activated and an interval period and pulse
duration has been set).
Temperature compensation (conductivity control):
The electrical conductivity changes as the temperature falls or rises. To obtain meaningful readings it
is therefore necessary that the measurements are based on the reference temperature of 25 °C and
that the measured conductivity values are corrected by the temperature coefficient factor α (Tk).
For automatic temperature compensation the following three settings are available: TK Linear, TK Norm
or TK Auto.
TK (Linear):
To ensure that the readings are based on 25°C set the TK value between 0 and 5.0 %/°C (default
setting 2.1 %/ °C). This setting permits the linear temperature compensation of the measured value
over the whole measuring range. This method is usually applied for steam boilers operating at
constant service pressure. After the TK is set and the service pressure is reached use a calibrated
conductivity meter to measure the conductivity of the boiler water and compare the reading with
the indicated conductivity value. If the reading differs from the indicated conductivity change the TK
setting until they tally.
TK (Norm):
Since conductivity is not a linear function of temperature over a larger temperature range, various
conditioning agents and different basic conductivities were used in order to ascertain empirical
conductivity/temperature curves. These curves are stored as standard curves and can be used for
temperature compensation. TK (NORM) is suitable for boilers operating with variable pressure, which
means that the boiler does not have a fixed working pressure (e. g. low load 10 bar, full load 15 bar).
TK (Auto):
For this method a characteristic conductivity-/ temperature curve of the plant (Auto curve) is used
for temperature compensation. However, first a characteristic Auto curve must be recorded. For this
purpose turn the navigation wheel at TK (AUTO) to start and then press the navigation wheel in order to
start recording the curve. Apply the max. service pressure to the steam boiler. During heating up every
10°C above 100°C temperature and conductivity values are recorded and the current temperature is
indicated. After having recorded 25 values or if STOP is selected the equipment stops recording and
saves the Auto curve.
TK (AUTO) is suitable for steam boilers operating with variable pressures.
When the compensation is switched OFF the absolute conductivity will be indicated.
43
Glossary – continued –
Cell constant (conductivity control):
The cell constant is a geometric quantity characteristic of the level electrode and is taken into account
when calculating the conductivity. However, in the course of time this constant may chance, e. g. due
to dirt deposits accumulated on the measuring electrode.
If a reference measurement yields a result that differs from the indicated conductivity value check the
temperature compensation first. Only if the temperature coefficient setting is no longer sufficient for a
correct compensation should you modify the cell constant. In this case change the cell constant until
the reading and the indicated conductivity agree.
24hour purging pulse (conductivity control):
To prevent blocking of the continuous blowdown valve a purging pulse is triggered when the mains
voltage is switched on. The continuous blowdown valve is actuated and opens for 2 minutes. After this
period the valve is motored into the CLOSED position where it remains for 2 minutes. Then the valve is
motored into the OPERATING position or into the required control position.
This process is repeated every 24 hours. During stand-by operation the time interval continues without
triggering off the purging pulse. Note that during the purging process the MIN limit is not active.
The 24 hour purging pulse can be switched ON or OFF.
44
For your notes
45
For your notes
46
For your notes
47
Agencies all over the world:
www.gestra.de
GESTRA
España
GESTRA ESPAÑOLA S.A.
Luis Cabrera, 86-88
E-28002 Madrid
Tel. 00 34 91 / 5 15 20 32
Fax 00 34 91 / 4 13 67 47; 5 15 20 36
E-mail: aromero@flowserve.com
Great Britain
Flowserve Flow Control (UK) Ltd.
Burrel Road, Haywards Heath
West Sussex RH 16 1TL
Tel. 00 44 14 44 / 31 44 00
Fax 00 44 14 44 / 31 45 57
E-mail: gestraukinfo@flowserve.com
Italia
Flowserve S.p.A.
Flow Control Division
Via Prealpi, 30
l-20032 Cormano (MI)
Tel. 00 39 02 / 66 32 51
Fax 00 39 02 / 66 32 55 60
E-mail: infoitaly@flowserve.com
Polska
GESTRA POLONIA Spolka z.o.o.
Ul. Schuberta 104
PL - 80-172 Gdansk
Tel. 00 48 58 / 3 06 10 -02 od 10
Fax 00 48 58 / 3 06 33 00
E-mail: gestra@gestra.pl
Portugal
Flowserve Portuguesa, Lda.
Av. Dr. Antunes Guimarães, 1159
Porto 4100-082
Tel. 0 03 51 22 / 6 19 87 70
Fax 0 03 51 22 / 6 10 75 75
E-mail: jtavares@flowserve.com
USA
Flowserve GESTRA U.S.
2341 Ampere Drive
Louisville, KY 40299
Tel.: 00 15 02 / 502 267 2205
Fax: 00 15 02 / 502 266 5397
E-mail: dgoodwin@flowserve.com
GESTRA AG
P. O. Box 10 54 60, D-28054 Bremen
Münchener Str. 77, D-28215 Bremen
Telephone +49 (0) 421 35 03- 0
Fax +49 (0) 421 35 03 - 393
E-Mail gestra.ag@flowserve.com
Internet www.gestra.de
818601-00/806cm · 2005 GESTRA AG · Bremen · Printed in Germany
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