GCU401

User manual

Table of Contents

1.

READ THIS FIRST ................................................................................................................................. 5

1.1.

P

RODUCT DOCUMENTATION

................................................................................................................... 5

1.2.

S

AFETY REGULATIONS FOR OWNER

/

OPERATOR

...................................................................................... 5

1.3.

G

UARANTEE

.......................................................................................................................................... 5

1.3.1.

Symbols used .............................................................................................................................. 5

1.4

A

BBREVIATIONS

..................................................................................................................................... 5

2.

INTRODUCTION .................................................................................................................................... 6

2.1.

LED D

ISPLAY

........................................................................................................................................ 7

3.

COMMUNICATIONS .............................................................................................................................. 8

3.1.

C

ENTRAL

S

YSTEM

................................................................................................................................. 8

3.2.

A

LARM DIAL

-

OUTS

................................................................................................................................. 8

3.3.

I

NTERROGATIONS

.................................................................................................................................. 8

3.4.

GCU P

ROGRAMMING

(OPTW

IN

)............................................................................................................ 8

3.5.

L

OCAL

OPTW

IN

(RS232)...................................................................................................................... 8

3.6.

R

EMOTE

OPTW

IN

................................................................................................................................. 8

3.7.

L

OCAL

I

NTERROGATION

(RS232) ........................................................................................................... 8

4.

POWER SUPPLY ................................................................................................................................... 9

4.3

DC P

OWER

S

UPPLY

.............................................................................................................................. 9

4.4.

CPU R

ESET

........................................................................................................................................ 10

4.5.

C

OUNT

(A

CCUMULATOR

) I

NPUTS

.......................................................................................................... 10

4.6

R

E

-

CALIBRATION OF ANALOGUE INPUTS

................................................................................................ 10

4.6.1

Re-calibration using OPTwin ..................................................................................................... 10

4.6.2

Parameterization using AquaView............................................................................................. 10

5.

COMMISSIONING ................................................................................................................................ 11

5.1

P

REREQUISITES

.................................................................................................................................. 11

5.2

A

DDING

GCU401

TO

A

QUA

V

IEW

.......................................................................................................... 11

5.3

S

ETTING UP

GCU401

IN

A

QUA

V

IEW

..................................................................................................... 11

5.4

S

ETTING UP THE OUTSTATION IN

A

QUA

V

IEW

......................................................................................... 12

5.4.1

Level sensor............................................................................................................................... 12

5.4.2

Overflow..................................................................................................................................... 12

5.4.3

Temperature sensor................................................................................................................... 13

5.4.4

Precipitation sensor (rain meter)................................................................................................ 13

5.4.5

Alarms ........................................................................................................................................ 13

5.4.6

Updating setpoints ..................................................................................................................... 13

5.5

INSTALLING

OPT

WIN

............................................................................................................................ 13

5.6

E

STABLISHING A CONNECTION

.............................................................................................................. 13

5.7

D

OWNLOADING CONFIGURATION FILES

.................................................................................................. 14

6.

INSTALLING APPLICATIONS ............................................................................................................ 15

7.

SETTING UP SMS MESSAGING ........................................................................................................ 15

7.1

S

ETTING UP A TELEPHONE NUMBER FOR

SMS

ALARMS

.......................................................................... 15

7.2

C

USTOM ALARM TEXTS

........................................................................................................................ 16

ANNEXE A : OVERFLOW MONITORING...................................................................................................... 17

R

ECTANGULAR SPILLWAY

................................................................................................................................ 17

V-

SHAPED SPILLWAY

...................................................................................................................................... 18

M

ANUAL INFEED OF THE OVERFLOWS

.............................................................................................................. 19

APPENDIX B: POWER CONFIGURATION OPTIONS FOR THE OVERFLOW APPLICATION.................. 21

S

TANDARD POWER CONFIGURATION

................................................................................................................ 21

L

OW POWER CONFIGURATION

......................................................................................................................... 21

MODEM AVAILABILITY SETTINGS .............................................................................................................. 22

AQUAVIEW SETTINGS; ADVANCED INFORMATION FOR INSTALLATION ENGINEERS ...................... 23

D

ISABLING

A

QUA

V

IEW

’

S

A

UTOMATIC

T

REND AND

R

EPORT

C

OLLECTION

........................................................... 23

O

VERRIDING

A

QUA

V

IEW

’

S

R

EQUIREMENT FOR

1

OR

5

MINUTE

T

REND

I

NTERVALS

.............................................. 23

1. Read this first

Before starting to install the GCU401, read this chapter carefully. It contains general information on documentation, safety and guarantee.

1.1. Product documentation

Documentation delivered with the GCU401. Check that this manual version is applicable to the delivered GCU401 version (see cover inlet).

1.2. Safety regulations for owner/ operator

All government regulations, local health and safety codes shall be complied with.

All danger due to electricity must be avoided.

1.3. Guarantee

Modifications or changes to the unit/installation should only be carried out after consulting with ITT-

Flygt.

Original spare parts and accessories authorized by the manufacturer are essential for compliance. The use of other parts can invalidate any claims for warranty or compensation

1.3.1. Symbols used

Safety instruction

Personal safety

Safety instruction

Personal safety -dangerous voltage

Special attention value

Apparatus or component damage

1.4 Abbreviations

• CS = Central System

• GCU = Remote Terminal Unit

• SCADA = Supervision Control And

Data Acquisition.

• PSTN = Public Switched Telephone

Network

• GSM

Groupe Spécial Mobile

(most popular standard for mobile phones)

• AquaView = Flygt’s SCADA software suite

• OPTWin = On-line Programming

Terminal for windows.

GCU401 User Manual 5

2. Introduction

Figure 1 GCU401

Flygt's GCU401 is a robust, ultra-low power Alarm

Telemetry Unit/Data Logger configurable to fit a wide range of applications within the utility, environmental and industrial markets.

The unit is DC powered and DIN rail mounted.

It can be used as a stand alone unit with local data retrieval or be remotely operated (i.e. send data, alarms, etc.) over a range of communication media like PSTN or GSM, etc. to a SCADA system, like

AquaView. Alternatively they can send SMS text messages.

The unit may be fully configured using the configuration program OPTWin for Windows software, available from Flygt

Observe all precautions for handling electrostatic sensitive devices before opening the unit.

GCU401 has a high degree of protection against moisture and dirt, but should always be installed so that it will not be unnecessarily exposed to water or the risk of external physical damage.

GCU401 may be used only in the manner specified by the manufacturer.

The manufacturer does not allow any internal modifications to be made in the unit.

Always keep this manual with the installed unit.

6 GCU401 User Manual

The ATUunit is supplied with integral diagnostic

LED displays as shown below.

These are colour coded in general as follows:

Green – I/O Status

Red – Alarm or receiving data

Yellow – Communications Status

Note that the normal operation is when the remote site is unattended therefore ALL LEDs will normally be extinguished.

During commissioning or when the engineer attends site then he has only to press the LEDs switch for the LEDs to become active. They will remain in the active state for 15minues and then return to their off-state to conserve battery power.

The following table describes the diagnostic LEDs.

Power LED.

On

when power is healthy i.e. full battery power or DC power between 11 and

35Volts DC.

Flashing

for 15 minutes to indicate low supply problem at rate of 1 flash per second.

DI1, DI2, DI3, DI4

On

when respective digital input is closed.

Off

when respective digital input is open

Off

after 15minutes to conserve battery power.

DO1, DO2

On

when respective digital output is closed.

Off

when respective digital output is open

Off

after 15 minutes to conserve battery power.

AI1, AI2

On

when respective analogue input is in alarm and within the 4 to 20mA value.

Flashing

when respective analogue input is less than 4mA or greater than 20mA.

Off

when respective analogue input is not in alarm and within the 4 to 20mA value.

Off

after 15minutes to conserve battery power.

TX1, RX1, TX2, RX2

On

when transmitting or receiving data on respective serial channel.

Off

when not receiving data

Off

after 15 minutes to conserve battery power.

Ring Detect

On

when the GCU401 detects communication is being attempted from remote site.

Off

when ring is not detected.

GSM Network Status

On

when the local GSM module is connected to the GSM network.

Off

when the GSM module is not connected to the

GCU401 User Manual 7

3. Communications

The GCU communications with a Central system can either be outgoing (alarm) or incoming

(interrogation). The following sections describe the general sequence of events in both alarm and interrogation modes.

dial-outs

Up to five different telephone numbers may be programmed into the GCU unit, each up to eighteen digits long (including pauses). The status of each telephone number may be designated as

Master or Back-up.

Each Sensor configured in the GCU401 for alarm dial-outs may be linked to any back-up number via the special phone index (See OPTWin user

manual

). When an alarm condition arises on that sensor, then the corresponding back-up is promoted to Master status for that alarm condition only.

If a valid alarm is detected, the unit will: -

1 Wake from low-power “sleep” mode.

all

enabled Master telephone numbers in order from 1 to 5. (providing all Masters are configured to must acknowledge – see

OPTWin user manual).

If ANY Master telephone number has failed to respond correctly: -

3

4

Back-up telephone numbers will be dialled.

They will be dialled, in order, until a successful attempt to ONE of them has been made.

Each telephone number will be tried in turn up to four times, with a delay of two minutes between any unsuccessful attempt and the next.

Following a successful call to a Master number there will be a delay of at least five seconds before the next Master number is tried.

3.3. Interrogations

Approximately six seconds after detecting an incoming ringing signal the unit will answer the call and commence communications with the interrogating equipment. Once communications have finished, the GCU and the interrogating equipment will release the telephone line. The unit will then return to “sleep” mode.

(OPTWin)

OPTWin is a proprietary application program available from Xylem Water Solutions. It may be used to both configure and interrogate an GCU401 unit. The host PC must be IBM-compatible, running

Microsoft Windows 95 or better.

The host PC may be connected locally to the GCU unit using RS232 cable. Alternatively, the PC may remotely access the GCU via the PSTN or GSM links. The details are given in the following sections.

3.5. Local OPTWin (RS232)

Local communication requires a custom cable

(details are provided in the Installation manual) to connect from a spare RS232 serial port of a host

PC to the local RS232 port connector on the GCU

PCB. The connection will automatically activate the

LEDs.

The communication settings in the host PC must be configured in OPTWin to match the settings on the GCU unit.

The usual data format:

• 8-bit

• no bit

The transmission speed will auto baud from 4800 to 115200 baud.

Remote communications require no additional wiring or setting up at the GCU but make use of a compatible PSTN or GSM modem connected to the host PC. A list of approved modems is available from Xylem Water Solutions.

On detection of an incoming ringing signal, the

GCU will “wake-up”. Approximately six seconds later it will answer the call and commence communications with the host PC.

Once communications are finished, the GCU and the host PC will release the telephone line. The

GCU will then return to “sleep” mode.

Full details for using OPTWin and GCU programming are covered in the OPTWin User

manual

.

3.7. Local Interrogation (RS232)

The GCU unit can be interrogated using data gathering equipment via the local RS232 port in the manner described in the previous sections.

8 GCU401 User Manual

N.B.

GCU401 should only be opened by suitably qualified personnel, as dangerous voltages may exist if the unit is disassembled.

4.3 DC Power Supply

The dc-powered GCU401 can be connected to an

11Vdc to 36Vdc supply. Typically a 24V DC supply is used.

The unit should only be opened by suitably qualified personnel.

The unit should only be opened by suitably qualified personnel.

Short-circuiting when the unit is disassembled may damage live electronics. Disconnect from the dc supply before removing the lid.

There are two battery back-up systems in the

GCU401. re-chargeable NiMH AAA size cell mounted directly onto the PCB.

Note

the insulating strip located at the +ve terminal of the NiMH battery should not be removed until after commissioning is completed. Failure to do this may result in the back-up battery discharging while external DC power is not yet present.

Pseudo Analogue 6 is the external DC Input monitor. This can be configured to indicate when the DC power is disconnected. Alarm dial-outs may be generated on this input, thus providing the facility to inform the Masterstation of DC supply failure on site.

Similarly Pseudo Analogue 5 is the back-up battery monitor that can also be configured to dial out when the back-up battery voltage is getting low.

Main back-up battery to allow 1 day operation

The main battery back-up which allows the unit to continue operation for up to 1 day without external

DC power, depending on user configuration etc, is provided by a 9V PP3 cell located on the unit side.

Battery back-up to prevent data loss is provided in the event of both DC and main battery failure by a

Back-up battery to prevent data loss

GCU401 User Manual 9

The GCU is monitored by sophisticated watchdog circuitry. In the unlikely event of the GCU not responding then a push button, mounted on the

PCB is provided for manual reset.

GCU401

Reset push button

Note that logged data and unit configuration are unaffected by pressing this Reset button.

4.5. Count (Accumulator) Inputs

Count inputs provide a totalised count for digital inputs. Using OPTWin, any digital input can be configured as a count input. Volt-free contacts, open collector and open-drain inputs are supported. The following states can be counted: -

• Opening contacts

• Opening and closing contacts

Each count input can be configured with up to two independent trip points. These trip points (Rate

Alarm Detectors – RADs) may be used to trigger an alarm dial-out or an ‘event’ log breaching a set value in any direction.

4.6 Re-calibration of analogue inputs

In some rare situations, e.g. after configuring the unit by downloading a configuration file, you may need to re-calibrate the two analogue inputs of the GCU401 by using the calibrate low and high commands on the OPTwin analogue input configuration screen.

Note

If you heed the guidelines in "Downloading

Configuration Files", you will record the original

10 calibration values, so re-calibration may not be necessary after all.

Calibration is normally done by means of a loop calibrator (current measurement range 0 – 24 mA).

1. Apply the minimum current/voltage (i.e. 4 mA) to analogue input 1 and click on Calibrate

Low. Apply the maximum current/voltage (i.e.

20 mA) and click on Calibrate High. (These values assume a 4 – 20 mA sensor is being used.)

2. Repeat for analogue 2.

Note

If you suspect that a sensor is incorrectly calibrated, you may instead calibrate the GCU401 with the sensor attached. For an analog level sensor, the calibrate low value is achieved with the sensor "in the air". (A true calibrate high value may or may not be possible to obtain, depending on the circumstances of the installation.)

See "Downloading Configuration Files" for more information.

AquaView

It is also possible to make adjustments to the analogue high and low settings using application set points from within AquaView. However, the resulting values are estimates and we recommend that either you keep the factory calibration or that you use a loop calibrator as described above.

An example is given below:

In an un-calibrated unit, an analogue input of 0 to

20mA defaults to an ADC L (low) of 800 and an

ADC H (high) of 53000 - so effectively each mA corresponds to 2600 "ADC units".

Therefore, calibration of a 4 to 20mA sensor would give an ADC range of 11200 to 52800, because:

ADC L = 800 + (4 x 2600) = 11200 and

ADC H = 800 +(20 x 2600)= 52800.

It follows that if you should re-calibrate a sensor as

4 to 15mA, then adjust the high value to:

ADC H = 800 + (15 x 2600) = 39800. i.e.

ADC L = 11200

ADC H = 39800

GCU401 User Manual

5. Commissioning

GCU401 is preconfigured with I/O setup and the following standard AquaView applications at delivery:

• Overflow application - e.g. "OVRFL109"

(These applications are also included on the

OPTwin CD. More applications may become available in the future.)

Advanced users may even re-configure GCU401 or build their own custom applications for it. This is done from a host PC running the proprietary

OPTwin software, available from Xylem Water

Solutions. Custom configuration and programming is not discussed further in this manual. (Please refer to the OPTwin user manual for details.)

The setup of analogue sensors may require recalibration, which is also done through the OPTwin interface.

You may restore GCU401 to its default settings by downloading the GCU401 bulk configuration file included on the OPTwin CD.

5.1 Prerequisites

In addition to the GCU401 unit, you will need the following:

• A Windows PC (Windows 2000 SP4 or better)

• AquaView 1.60.01 (or later), in order to employ GCU401 in the AquaView SCADA system.

• OPTwin 3.0 (or later), required both for sending SMS messages and for reprogramming GCU401.

• A Local OPTwin serial port connector cable or

An approved GSM-modem.

5.2 Adding GCU401 to

AquaView

The following instructions assume that you have already installed the AquaView software on the host PC. (Please refer to the AquaView installation manual, available from Xylem.)

Note:

All previous applications etc were created for the ATU401 but are 100% compatible with the

GCU401.

Where this document states GCU401 in certain places AquaView may show ATU401 both are interchangeable and acceptable.

Start AquaView. This also starts the AquaView

Central:

GCU401 User Manual

1. In the AquaView Central, select the drop-down list at the bottom of the first column and select

Port 1.

2. Click the button labelled Configuration program.

The AquaView configuration program dialog opens in a new window.

3. Log in from Security - Log in.

4. Click the server name (here: "920 MyAqvSrv") and select Add RTU in the float menu.

AquaView configuration program - Add RTU

The Add RTU dialog opens in a new window. In this dialog we will make a number of entries:

• a group name, e.g. "Main", "Group 4" etc.

• a name, e.g. "GCU401", "Oak street 24" etc.

• a number. Important! You must enter "900"

(=default from factory) or AquaView will not be able to identify the unit! (This number will soon be replaced by the proper number, as described in the next chapter.)

• communication type. A connected modem should already be selectable in the drop-down list, e.g. "Port1; Id=COM1; Name=GDW11;

Type=Modem"

• phone number (i.e. to the GCU’s SIM card)

5. Under Type, select "Install ATU from template file" and then browse to the desired template on the OPTwin CD, e.g. GCU401_100En.atf. and click

Open.

6. Complete installation of the GCU401 by clicking the Install button. It will

5.3 Setting up GCU401 in

AquaView

The next step is setting up specific parameters for the GCU401 unit:

1. Log in to AquaView

2. Browse to the GCU401 symbol in the Station bar.

3. Right-click the GCU401 symbol and select

Setpoints in the float menu. The Ask for setpoints from ATU dialog message box opens. There are no setpoints to fetch yet, so you should click the No button the first time.

11

14. Renumbering of the RTU is complete. You can now select File - Exit to close the

AquaView configuration program dialog.

AquaView - Setpoints

4. The Setpoints and Alarm priorities folders appear in the main list box. Double-click

Setpoints to open its sub-folders.

5. Open the Communication setup folder. The first entry is Tel1 Pager or Paging Central, i.e. the phone number to the modem connected to the

PC. Click this entry and the input box is activated for it.

Note:

The input box is used for editing any of the values and also displays help text for each entry.

6. Type the telephone number (without spaces) in the input box and press the <Enter\> key.

7. Press <Enter\> repeatedly to reach entry number 5: Tel1 Select Protocol. You should specify "12" for AquaCom.

8. The next entry is Tel1 Function where you should specify "1" for Master. This concludes the communications setup for now. (You may specify phone numbers for alarm dial-outs later.)

9. Open the AquaView Admin folder. Click

AquaView Plant Number and enter the intended identification number, e.g. "201".

(Avoid using numbers in the 900-series or any number already reserved in the SCADA system).

10. Right-click in the main list box and select

Update in the float menu. This will send the values you just edited (only) to the GCU.

11. In order to complete the renumbering, you must now return to the AquaView Central.

From here, open the AquaView configuration program and browse to the GCU401 unit

(which is still identified as number 900).

12. Right-click the unit name (you may be prompted for login again) and select Change

RTU number in the float menu. The Modify

RTU dialog opens in a new window.

13. The Enter number for RTU drop-down list displays the current number. Open the list, scroll through the available numbers to select the correct one, then click the Close button.

The newly installed unit is still identified as number "900". It will now receive a proper identification number:

12

AquaView configuration program - Change RTU number

Note:

Every CGU401 unit is assigned station number

"900" from the factory. Should you download a bulk configuration file, the station number will also default back to "900".

The next section describes the basic setup necessary for commissioning the unit, by entering more setpoint values.

5.4 Setting up the outstation in

AquaView

In order to define the layout and setup of the outstation and its measuring equipment in

AquaView, the list of setpoints will be edited.

Note

The setpoints list may look different depending on the loaded application(s).

sensor

Start by defining setpoints for an analogous level sensor:

1. While still viewing the list of setpoints, open the

Level sensor Ana-1 folder.

2. Click and edit the entries for maximum and minimum values as well as alarm level values as appropriate.

Note

:

If you wish to disable the alarm minimum level, you can specify a negative value (e.g. -100).

5.4.2 Overflow

The Overflow definition folder contains the setpoints necessary for making overflow calculations - See Appendix A for details.

The Manual weir profile folder is only used if you specified "2" under Weir select above.

GCU401 User Manual

You may connect a second analogue sensor. The default intended use is a temperature sensor.

1. Open the Level sensor Ana-2 folder.

2. Click and edit the entries for maximum and minimum values as well as the alarm level values.

5.4.4 Precipitation sensor (rain meter)

The default intended use for the digital channel is a rain meter. The setpoints are found in the Counter folder.

1. Open the Counter folder.

2. Click and edit the entries for maximum downpour in mm per 5 minutes and 24 hours

(e.g. "5" and "25", respectively).

3. Enter a value for Counter scale. The chosen value depends on the rain meter model. At a scale of 20% (appears in the telegram as

"20"), five physical relay closes/contacts translates to one count, or 1 mm.

Consequentially, at 100% 1 relay close= 1 mm.

5.4.5 Alarms

You may want to edit the alarm settings too:

In the Test alarm folder you can specify an interval and a time when a test alarm will be generated. failure to generate the test alarm, indicates that the unit needs service.

You will probably want to activate the Low Battery

Alarm and DC fail Alarm.

In the Alarm priorities folder, you can change the priority class for any alarm type. You may for instance want to define Low internal battery and

Mains error to "A"-alarms.

When you are satisfied with all setpoint values, you should right-click in the list box and select Update all in the float menu. This will transfer all setpoint values and alarm priorities from AquaView to the

GCU401 unit.

You may now check that the setpoints have been uploaded by selecting the unit in AquaView, selecting Setpoints in the float menu and this time answering Yes in the Ask for setpoints from RTU dialog.

OPTwin

You will need OPTwin in order to set up GCU401 for sending SMS-messages or for installing or reinstalling software in the unit. Described below is the OPTwin installation process from the CD:

1. Insert the OPTwin CD into the CD-ROM drive of the host PC. Wait for auto run to open the main folder.

2. Explore the contents of the main folder and open the sub-folder named OPTwin Install.

3. Double-click the icon named setup.exe.

GCU401 User Manual

4. Follow the on-screen instructions to complete the installation. (Default options should suffice.)

5.6 Establishing a connection

The GCU401 Installation manual, describes how to make a local OPTwin connection.

A local connection is recommended due to better speed and reliability, albeit remote communication is possible.

You should now be ready to establish the connection:

1. Start OPTwin on the host PC. The OPTwin terminal is displayed.

2. Click the Program Options tab, enter "COM1" in the Direct Port drop-down and click the

Apply Changes button.

OPTwin - Program Options tab

3. Click the Outstations Online tab and then click the Connect button. The Site identity and security code dialog opens in a new window

4. In the Site Identification group, make sure that

Site ID is set to "9999". Also enter Security

Code "2905".(There is no reason to change these default values. Note! If there is a problem with the connection, you may have to increase the Baud Rate setting.

5. Click the Connect button to establish the connection. This also closes the second dialog.

13

Site identity and security code dialog

files

A configuration file may be downloaded to the unit.

Considering that your GCU401 unit is already configured at delivery, this may be required in three situations:

• You need to update the configuration.

• You need to restore the unit to original setup.

• You wish to install customized software.

1. Start OPTwin, connect to the GCU401 and make sure that you are viewing the Outstation

Online tab.

2. Click the I/O Configuration button in the O/S

Configuration group. The Edit Outstation I/O

Configuration dialog opens in a new window. values are overwritten. Always make a record of existing values before you re-configure the unit!

3. Check that Data type = "Analogue" and Number

= "1".

• Look at the ADC group; Write down the two values for H and L.

• You may also want to write down the Scale numbers defining the range of measurements.

4. Change to "Analogue", "2" and write down these calibration values too, then Exit the dialog You are now ready to load the configuration file.

5. Select the Advanced tab and click the button labelled Send Bulk Configuration File. The

Save outstation configuration dialog opens in a new window.

6. Browse to the bulk configuration (*.blk) file you wish to install. The file to be used for restoring the original configuration, can be found on the OPTwin CD (e.g. D:/ GCU401

Configuration/FullCFG ipr115200 v3_5 Telit

Modem.blk).

Edit Outstation I/O Configuration dialog

Notice

: When a configuration file is installed, factory calibration as well as modified calibration

14

OPTwin - Advanced tab

7. Select the configuration file and click Open.

Installation of the file will take a few minutes.

(If you use remote access, this will take even longer). After some time you will get a message stating "New configuration accepted, you must reconnect". Do not do so just yet!

First the GCU401 will need to shut down and re-initialise three times, so be patient.

8. After a few more minutes the GCU401 will be ready and you should connect in the usual manner. (Remember to enter the Security

Code again to log in.)

9. The unit is now configured. However, you may also revisit the Edit Outstation I/O

Configuration dialog in order to enter the original calibration values again.

10. Simply type in the old ADC values H and L

(and possibly also the Scale values H and L).

You can now Exit the Edit Outstation I/O

Configuration dialog.

GCU401 User Manual

Configuration of the GCU401 is now complete, but the unit isn’t fully operational until some application files are installed. This is described in the next section.

There are currently two application files available for installation in GCU401. This instruction describes the installation process. (It is of course similar for custom applications.) You should install both applications, one after the other. Proceed as follows:

4. From the OPTwin terminal, make sure that you are viewing the Outstation Online tab.

Click the Access Sequence button in the O/S

Data group. The Sequence Monitor dialog opens in a new window

5. Click the Get Status button. After a few seconds the (empty) sequence data is loaded into the screen.

6. Click the Load button to open the Download sequence dialog.

7. Browse to the configuration (*.obf; *.obj) files you wish to install. The files to be used for restoring the original configuration, can be found on the OPTwin CD (e.g. D:/ GCU401

Applications/ovrfl108.OBJ and D:/GCU401

Applications/precip.OBJ).

8. Select one of the files and click Open, then click Commit in the Sequence Monitor dialog and follow on-screen instructions. The loaded application will appear in slot 01 in the screen.

9. Repeat for the other file, which will appear in slot 02.

10. Both applications are now installed, but not yet running. To start an application, select it in the Select Sequence drop-down list and click

Start.

11. Repeat for the other application, then click

Exit to leave the Sequence Monitor dialog.

Note:

If you download a bulk configuration file, any installed applications will be deleted, so you will have to re-install them afterwards.

12. You should now Disconnect, then Exit OPTwin and detach the OPTwin cable, to conserve batteries! Or you may first continue to the next section which describes how to set up SMS messaging.

7. Setting up SMS messaging

Here is described how to set up GCU401 for sendingSMS-alarms. This is done in the OPTwin terminal

7.1 Setting up a telephone number for SMS alarms

The procedure described below is identical for setting up consecutive Master and Back-up numbers.

1. Start OPTwin, connect to the GCU401 (unless you are already connected) and make sure that you are viewing the Outstation Online tab.

2. Click the Quickstart menu option. The Quick

Start dialog opens in a new window.

Quick Start dialog

3. Under Alarm Notification, fill in Site name (e.g.

"Main street 12"), then enter the first telephone number (e.g. "0734200232"), select

"GSM SMS" in the first dropdown and

"Master" in the second.

4. Click the Download button.

5. Auto acknowledge is default. If you prefer manual acknowledge, click the button marked with an "arrow" at the end of the entry line to open the Advanced Settings Phone Number 1 dialog.

GCU401 User Manual 15

Advance Settings Phone Number 1 dialog

6. Under SMS Notification, change Dialback acknowledge required to "Yes" and fill in appropriate time in Dialback acknowledge timeout (in seconds).

7. Finally, click the Download button.

Acknowledgement procedure. The user must call

(not SMS) the outstation back within the specified time before the outstation considers the alarm accepted. Simply:

Dial number; Wait for modem negotiation tones;

Hang up

The following is an example of an SMS alarm text:

• • ALARM REPORT: Main Street

12;26/10/2009 14:45:40; DIG IP 4 FAIL

For better clarity, you may edit the standard alarm texts for digital input 3 and 4 as described below:

1. From the Outstation Online tab, click the I/O

Configuration button in the O/S Configuration group.The Edit Outstation I/O Configuration dialog opens in a new window:

Edit Outstation I/O Configuration dialog

2. At top left: Select Data Type "Digital" and either Number "3" or "4".

3. At bottom left: Edit the Normal text: to Custom normal text

4. Edit the Fail text: to Custom fail text

5. Click Update to save changes, then Exit.

6. Disconnect, then Exit OPTwin and remember to detach the OPTwin cable, to conserve batteries!

16 GCU401 User Manual

Annexe A : Overflow Monitoring

GCU401 calculates the overflow rate and stores the overflow time, number of overflows and the overflowed quantity.

If GCU401 is to initiate an alarm when overflow occurs, this must be specified.

Calculation of the flow is based on formulas in the overflow application, which obtains data from level measurement and from input particulars of the dimensions and type of the spillway for the relevant measurement place.

An analogue level sensor is used for measuring the level. It is important to select a level sensor that is insensitive to changes in atmospheric pressure, deposits, floating sludge and foaming. In addition, it must be fully submersible.

Three different calculation cases can be preset:

1. Rectangular spillway

Rectangular spillway

W

W = width of spillway

1

The program calculates the flow over a rectangular spillway from the expression

Q = h

1,5 x W x K x √( 2g) x 2 / 3 where:

• Q = flow (m

3

/s)

• h = retained water height (m), variable value from level measurement. h =measured level - preset overflow level.

• W = width of spillway (m)

• K = coefficient of discharge

• g = gravitation acceleration = 9.81 m/s

2

The coefficient of discharge is a value between 0.00 and 1.00, which describes certain properties of the spillway, such as the edge design, channel design, etc. A typical value for a rectangular spillway is Dc =

0.62. The spillway manufacturer should submit this information.

V-shaped spillway

W

S

W = width of spillway

S= Overflow Range

The program calculates the flow over a V-shaped spillway from the expression

Q = h

2, 5 x (W / S /2 ) x (8 x 15) x √( 2g) x K where:

• Q = flow (m

3

/s)

• h = retained water height (m), variable value from level measurement. h =measured level - preset overflow level.

• W = width of spillway (m)

• S = spillway range (m)

• K = coefficient of discharge

• g = gravitation acceleration = 9.81 m/s

2

The coefficient of discharge is a value between 0.00 and1.00 that describes certain properties of the spillway, such as the edge design, channel design, etc. A typical value for a V-shaped spillway is Dc =

0.58. The spillway manufacturer should submit this information.

Manual infeed of the overflows

If the overflows at a minimum of two levels are known, GCU401 can calculate the intermediate flows.

The overflow at a maximum of ten (10) levels can be specified. The levels selected should be uniformly distributed within the overflow range.

An overflow curve is determined by the program, based on the input values. Flows from the intermediate levels can be obtained from the curve. The larger the number of values plotted, the more accurate they will be. If the flow is specified only at two overflow levels, one of these should be at half of the overflow range height and the other at the maximum overflow level.

2

1

S = Overflow Range or Span

1. Overflow 1: 72.6 l/s

2. Overflow 2: 138.6 l/s

3. S=Overflow range

The flow curve is defined by levels

5

4

3

2

1

S = Overflow Range

1. Overflow 1: 13.8 l/s

2. Overflow 2: 38.6 l/s

3. Overflow 3: 94 l/s

4. Overflow 4: 128.2 l/s

5. Overflow 5: 138.6 l/s

The flow curve is defined by five levels

GCU401 User Manual 19

Example of overflow curve calculated from ten input values.

• • Q=Overflow l/s

• • span

• • Overflow curve

If the overflow is clogged or if the drop from the spillway to the recipient is not free, the calculated overflow curve will be wrong.

Appendix B: Power configuration options for the

Overflow Application

GCU401 comes with two alternative power configurations:

• Standard power configuration - "FullCFG ipr115200 v3_8 Standard".

• Low power configuration - "FullCFG ipr115200 v3_8 LowPower".

Note

: The same overflow application, "OVRFL108", is used with either configuration.

Standard power configuration

The "FullCFG ipr115200 v3_8 Standard", standard power configuration, will work with any version of

AquaView. In this configuration, scanning of the analogue level sensor as well as data logging is performed once every minute.

Standard power configuration is very taxing on the internal battery supply and is only recommended when GCU401 is fitted with DC power supply.

Low power configuration

The "FullCFG ipr115200 v3_8 LowPower", low power configuration, is recommended when GCU401 is powered from internal batteries.

In low power configuration, the following applies:

• The level sensor, AI1 is scanned and data is logged only once every four hours, as long as there is no overflow or pre-overflow condition. This reduces power consumption significantly but also reduces the amount of data being stored in the GCU401 and transferred to the central system.

• A digital float switch, DI1 is needed for switching state if the overflow level is reached. This triggers a change in scanning and logging rates to once every minute, allowing for accurate calculations of flow rates and volumes during overflow.

• A second digital float switch, DI3 may also be connected. This is installed at a level below the

Note

: overflow level and is used for triggering fast scanning and logging already before overflow occurs, thus providing useful information on fluid behaviour before during and after the overflow event.

AquaView 1.60.02 or later is required in order to employ low power configuration.

GCU401 User Manual 21

Modem availability settings

By default GCU401 is contactable 24 hours a day. While convenient, this increases the drain on internal batteries considerably.

GCU401 also has built in functionality for significantly increasing battery life by powering down the modem completely, except during two pre-configured time slots. This is known as "modem windowed" mode.

When in low power configuration, GCU401 is contactable between 9:00 and 11:00 and 15:00 to 17:00.

This means that it cannot be contacted at all by remote outside these time slots. (Re-programming of the time windows is not recommended, as such changes must be duly recorded and communicated to all concerned.)

However, should an alarm condition occur, for instance an overflow, the ATU will always power up the modem and dial up the central system to report the alarm event.

Where only battery power is available, it is highly recommended that the unit is set to modem windowed mode. A set point channel is provided for this.

AquaView settings; Advanced Information for

Installation Engineers

There are certain settings in AquaView which need to be configured for the low power option:

1. Set AquaView to collect trend and report data automatically before disconnecting.

2. Use the ATU set point channel Test Alarm to set up a daily or weekly 'Dial In'.

3. Disable AquaView automatic report gathering for the station.

4. Enable AquaView advanced trend handling (trend data with variably spaced timestamps).

Points 1 and 2 above are standard AquaView configuration items; please refer to your AquaView documentation.

Points 3 and 4 require an AquaView database modification to be performed for each low power station, as described next.

Remember to restart the AquaView Central!

Disabling AquaView’s Automatic Trend and Report Collection

Please note that this setting will only prevent time initialized data collections. Manual data collections and optional data collections created when the GCU dials in an alarm will not be affected.

Settings in the DataContainer table: GCUno = <920-929>, Number of AquaView Central

Section = StnXXX, where XXX is the three digit plant number

Id = BlockAutoDC

Contents = 1, default value is 0, (Off), for this setting”.

Overriding AquaView’s Requirement for 1 or 5 minute Trend Intervals

As the trend display still requires 1 or 5 minute data values in the database, this setting prompts

AquaView to fill in missing trend blocks.

Settings in the DataContainer table:

GCUno = <920-929>, Number of AquaView Central

Section = StnXXX, where XXX is the three digit plant number

Id = TrendCollectMode

Contents = 1, default value is 0, (Off), for this setting.

GCU401 User Manual 23

1) The tissue in plants that brings water from the roots

2) A leading global water technology company.

We’re 12,000 people unified in a common purpose: creating innovative solutions to meet our world’s water needs. Developing new technologies that will improve the way water is used, conserved and re-used in the future is central to our work. We move, treat, analyse and return water to the environment and we help people use water efficiently, in their homes, buildings, factories and farms. In more than 150 countries, we have strong, long-standing relationships with our customers who know us for our powerful combination of leading product brands and applications expertise, backed by a legacy of innovation.

For more information on how Xylem can help you, go to xyleminc.com

Xylem Water Solutions (UK) Ltd

Colwick

Nottingham

NG4 2AN

United Kingdom

Tel +44 (0)115 940 0111

Fax +44(0) 115 940 0444

GCU401 Owner manual V1.0