GDS GasVac LG-1 User manual
TECHNOLOGIES
GDS TECHNOLOGIES LTD |FUSION POINT |ASH LANE |GARFORTH |LEEDS |LS25 2GA |UK www.gds-technologies.co.uk
This document is not contractual and the equipment specification may be modified at any time without prior notice.
C1780
Manual No. 351DIC
Issue Av2
GasVac LG-1
LAND GAS MONITOR
OPERATING HANDBOOK
1
CONTENTS
This document is non contractual and the equipment specification and detail may be modified at any time without prior notice.
SYSTEM OVERVIEW....................................................................................................................................................................2
GENERAL SPECIFICATION .........................................................................................................................................................3
LED AND LCD INDICATORS.......................................................................................................................................................4
PUSH BUTTONS ........................................................................................................................................................................5
ENTERING A PASSWORD TO GET TO USER OR ENGINEER’S MENUS ..........................................................................................6
HOLDING THE DISPLAY.............................................................................................................................................................7
TESTING THE LEDS AND RELAYS ...............................................................................................................................................7
INHIBITING A SENSOR ..............................................................................................................................................................7
GAS TYPE LIBRARY.....................................................................................................................................................................8
DIMMING THE LED’S.................................................................................................................................................................9
MUTE THE BUZZER ....................................................................................................................................................................9
FLOW FAIL AND PUMP FAIL .......................................................................................................................................................9
LOCAL AND REMOTE RELAYS ....................................................................................................................................................9
MODBUS SET UP AND INDICATORS ........................................................................................................................................10
REPEATER ................................................................................................................................................................................11
RS232 DATA LOG OUTPUT......................................................................................................................................................11
EVENT LOG.............................................................................................................................................................................12
DATA TO AND FROM A PC USING GDS TERMINAL...................................................................................................................12
SETTING THE TIME TO ALARM .................................................................................................................................................14
SETTING ALARM LEVELS...........................................................................................................................................................14
ALARM RELAY OFF TIMERS.......................................................................................................................................................15
VOTING RELAYS ......................................................................................................................................................................15
TIME WEIGHTED ALARMS ........................................................................................................................................................16
DEFAULTING THE PANEL .........................................................................................................................................................16
DEFAULT THE WHOLE PANEL FROM POWER UP .......................................................................................................................16
INSTALLATION.........................................................................................................................................................................17
SERVICE – ROUTINE ATTENTION .............................................................................................................................................18
MENU FUNCTIONS BY NUMBER..............................................................................................................................................19
APPENDIX 1 ............................................................................................................................................................................24
APPENDIX 2 ............................................................................................................................................................................26
APPENDIX 3 ............................................................................................................................................................................27
APPENDIX 4 ............................................................................................................................................................................27
XDI-XDIWIN – 15/30J ..............................................................................................................................................................29
XDI-XDIWIN – 15/30J ..............................................................................................................................................................31
CV TRANSMITTER ...................................................................................................................................................................33
CAN RELAY UNIT.....................................................................................................................................................................34
SENSOR ASPIRATOR MODULE .................................................................................................................................................35
SYSTEM COMPONENTS ..........................................................................................................................................................36
PICKING LIST ..........................................................................................................................................................................37
SAMPLE FLOW PATH ................................................................................................................................................................38
2
SYSTEM OVERVIEW
The Land Gas Monitor is designed to be used in a safe area, external to the area being monitored
for potential hazardous conditions, measure up to 8 different gases whilst checking for alarm
conditions. A vacuum pump draws the gas to the sensors on a continual basis resulting in gas
readouts being displayed on the screen, the pump system also incorporates a pump fail and line
blockage monitor.
The main computer board controls most actions. With an LCD display it is capable of indicating the
state of sampling or fault conditions. Likewise, dimmable LED’s and relays give additional displays
of the system state. Many parameters are programmable and are retained when power is off, in a
none volatile memory chip. These parameters are reloaded at the next power up so that the system
will perform as previously set.
A real time clock keeps track of time and this time value is appended to any panel events such as
alarm or fault etc. The events are retained in a 99 event memory which can be viewed on the LCD
or sent to a PC via the RS232 channel.
The RS232 channel can also accept parameters from a PC and if needed, can send the panels
parameters to the PC. Using simple text files, these can be edited and sent back to the panel.
In addition to 8 gasses, an optional cabinet flammable only gas is monitored in the panel and will
cause power shutdown if it goes into alarm, preventing the possibility of local gas ignition.
Engineering and User mode menus are available via password entry and allow parameter changes
and system checks to take place. However, muting the buzzer which sounds if an event occurs can
still be silenced by pressing any key.
Sensors connected on the CAN bus can have their address changed using ENGINEER’S menu 27
(Described in appendix:1).
Please note:
Connected sensors are recorded as present by the panel. If a sensor is removed, and then the panel
is switched on, a fault will occur showing the missing sensor.
Use ENGINEER’S menu 16 to clear all addresses if required.
Front panel LED’s indicate the general state of the panel. The red alarm LED will flash for new
alarms until accepted/muted when it stays on constantly until reset. The amber fault LED comes on if
a fault is present. If any sensor channel is inhibited the amber inhibit LED will be on.
Additional reset and mute terminals are available to allow remote action in the event of an alarm or
fault condition. Test facilities are included in the engineer’s menu, which allow relays to be manually
activated during commissioning.
3
GENERAL SPECIFICATION
Addressable Sensors 1 - 8 Sensor inputs (CAN network – 4 wire)
end of line termination required. 1.7W per sensor
Measurements Combustible gas - LEL % vol.
Toxic gas - ppm % vol.
Oxygen - % vol.
Sensor Types Electrochemical - Infra Red - Pellister
Sensor Cable Addressable CAN bus, 4 Core 1.5mm screened
Power Supply 230/115Vac 50/60Hz +/-15% 24-28Vdc
Power Board = 6 Watts, Main processor board = 5 Watts
(See 1 and 2 for sensor loading)
Indication 4 line, 40 character LCD
3x Externally visible LEDs for ‘Fault’, ‘Alarm’ and ‘Sensor Inhibit’
User Interface 7 Buttons on main board and or repeater
(Up, Down, -, +, Select, Dim, Reset)
Alarm Settings 3 Alarm levels which are user selectable High, Low, and Over range
Panel RS232 data log, (up to 10 meter) CAN bus (up to 1Km)
Modbus slave to an external Modbus Master (up to1Km @ 9600 baud)
Optional Relay card (up to an additional 64 relays)
Common Low alarm relay DPCO or ‘Group 1’
Common High alarm relay DPCO or ‘Group 2’
Common Over Range alarm relay SPCO or ‘Group 3’
Fault relay SPCO or ‘Group 4’
OPT G5 LTEL/STEL relay SPCO or ‘Group 5’
OPT G6 LTEL/STEL relay SPCO or ‘Group 6’
OPT G7 LTEL/STEL relay SPCO or ‘Group 7’ / Fault
OPT G8 LTEL/STEL relay SPCO or ‘Group 8’
(Relays Lo, Hi and OR can be latched or unlatched)
(Groups and LTEL/STEL relays can only be unlatched)
Relay rating 5A@250Vac none inductive / capacitive
Audible Mutable Buzzer
Remote sounder – common – sounder out
Dimensions (H) 640mm x (W) 450mm x (D) 280mm
IP rating IP65
Fixing Details Wall mount 4 x M8
Sample Lines Material – nylon, PTFE, stainless steel, copper
Size – standard 6mm OD, 4mm ID
Maximum length 100 m, 100 m + specials
Couplings – standard – push fit, compression option
Vent Lines 6mm push fit
Enclosure Mild steel powder coat BS00A01
Cable Entry Bottom
Weight –
Terminals Field terminals 2.5mm
Operating Temperature 5 to 40°C
Features Remote reset
Remote repeater panel (option)
4/8/32 way CAN relay panel (option)
4
LED AND LCD INDICATORS
A four line 40 character LCD displays a range of information typically shown below.
Gas Value
A6 10 PPM CP xxxxxxxx xxxxxxxxxxx
Alarms = 0 Faults = 0 Sensors D = 4 A = 6
12.24 Tue 31 Jul 2012 GDS Technologies Ltd 0113 2860166
Gas Type Customer Programmable text
Addressable
sensor
Company Text
Alternating user text display
(programmable)
Continuously
updating
display lines
Line 1 Addressable sensor, values and gas type and location
Line 2 General information, Number of Alarms, Faults and Connected sensors
E.g. A=6 means 6 addressable sensors connected
Line 3 Date and Time alternating with user text.
The first line displays addressable inputs indicated by A. This will cycle through all
active addressable (CAN) sensors automatically but will hold on a specific sensor if it is in
alarm. Pressing + button (4) will stop the cycle on the current sensor for 999 seconds.
If a new alarm occurs, the display will show this sensor.
The type of gas and the text associated with this sensor is displayed.
The second line displays the number of alarms and faults present in the system.
Normally these are zero. Additionally, addressable sensors in the system are displayed.
The third line displays shows the internal clock reading together with the day and date.
All internal events use this clock to record the time of event.
If an alarm or fault event occurs, the clock display is substituted with the text for this event
and will alternate every second or so if the text is lengthy but will remain readable.
This text which describes the event (e.g. Modbus fail) is also the same text which is stored in
the event log which can be viewed separately. (See Event Log).
This line also alternates with user text, e.g. company name and telephone number.
5
PUSH BUTTONS
7 user buttons are provided on the front to allow control and setting up of the system plus there is
an internal PCB button. These buttons are also numbered and shown in brackets e.g. button 3 is
(3).
Button 1 is the Accept/Mute and UP button. When in engineer’s mode, it is used to increment
parameters which are being modified. Also, it allows the displayed sensor to be moved onto the
next active sensor.
Button 2 is the “-” button. Used when decrementing items in engineer’s menu, also to escape from
the engineers menu system when not in any specific menu.
Button 3 is the SELECT button. It is used to enter and exit many of the engineer’s menus. Also
when first pressed, it prompts the entry of an engineer’s password. When correct, the engineer’s
menu is displayed in which sub-menus can be selected by pressing the SELECT (3) button again.
Button 4 is the “+” button. Pressing this allows the display to hold the automatic sequence of
sensors being displayed for 999 seconds.
When in engineer’s mode, it is used to increment parameters which are being modified.
Button 5 is the DOWN button. Used when decrementing items in the engineer’s menu.
Button 6 is the DIM button. It is used for dimming the LED’s and LCD backlight and will toggle
between full brightness and the dim level previously set in the engineer’s menu. DIM can be used at
any time except when doing an LED test whereby automatic dimming occurs to reduce current.
Button 7 is the panel RESET and is used to clear faults or alarms. It is generally active and will act
regardless of entry of passwords.
Processor reset button and a flash programming jumper are situated directly on the PCB and
are not accessible from the front panel.
This button when pressed will restart the processor as if just powered up and should only be used in
the event of a system crash. The jumper removed for normal operation.
6
ENTERING A PASSWORD TO GET TO USER OR ENGINEER’S MENUS
To protect system parameters from being altered by unauthorised people. Two passwords have to be
entered to gain access to available menus which allow changes to be made.
The first 4 button password is the USER menu and gives access to a limited set of menus, e.g. clock
set, LED test etc. The second 4 button password is for the ENGINEER’S menu which gives access to
all menus including the users. A sequence of 4 buttons is accepted as the entry for a password.
TO START THE ENTRY OF THE PASSWORD, PRESS SELECT (3).
The password display is shown on the LCD and each of the 4 buttons in sequence can now be
pressed.
Default Passwords
The USER password is defaulted to DOWN (5) pressed 4 times.
The ENGINEER’S password is defaulted to + (4) pressed 4 times (or as per customer requirement).
Changing the engineers password is described later.
The user password cannot be changed.
System Menu Index See Appendix 1 for further details.
Note: The items that appear in the user menu can be selected from the Engineer’s menu by
toggling the +(4) button. A ‘+’ symbol will appear in the menu next to the item to indicate it is
available in the user menu. Engineer’s menu contains all items.
1 View Modbus Reg
2 Set Clock*
3 Inhibit all Sensors
4 View Modbus txrx
5 Refresh Rate
6 Edit Company Text
7 Lamp Test*
8 Relay Test
9 Event Log to LCD*
10 Add zero/span
11 LCD Led Bright*
12 Exit*
13 Top of Engineers
14 Inhibit Sensor*
15 Add Alarm Levels
16 Clear All Addresses
17 Alter Chan Text
18 Alter Gas Type and Range
19 View Add sensor status
20 4-20mA Zero Span
21 4-20mA Alarm Levels
22 Unlatched Alarms
23 Event to Relay64
24 Relay off Timers
25 Channel Voting
26 Seconds to Alarm
27 Setup Network
28 Event log to PC
29 Data PC to Panel
30 Data Panel to PC*
31 Ltel Stel Alarm
32 Default Sections
33 Engineer Password
34 Set Modbus Baud
35 Set Power Alarms
35 Set Power Alarm
36 Energised Relays
Items highlighted with a (*) below appear in the user menu by default
7
HOLDING THE DISPLAY
As the display cycles through the active sensors sequentially, it may be required to stop on a
particular channel for maintenance.
This can be achieved using the + (4) button on the front panel which when pressed will hold the
current sample for 999 seconds. A countdown is displayed on the LCD showing that hold is in
progress. At the end of this time normal display sequencing will resume.
The gas values displayed on the LCD during hold are still the current live readings from the sensors.
Hold can be removed at any time by pressing the + (4) button for a second time.
As the sequence of display continues it is sometimes required for maintenance to choose another
sensor for display and this can be achieved using UP (1).
This button when pressed terminates the current display it moves to the next displayed channel and
if pressed continuously, this button will step through all available sensors When the desired channel
is reached and the button released, press + (4) to hold this display for 999 seconds. Pressing + (4)
will release the system back to normal.
TESTING THE LEDS (7) AND RELAYS (8)
To test all LED’s and beep the buzzer, use menu number 7 and press SELECT (3) to make all LED’s
illuminate in dimmed mode to see if they are functioning. At the end of the test, the buzzer beeps
twice to confirm its operation.
When a remote relay board is present in the system, each of the 64 relays can be energised or de-
energised using USER menu number 8.
When selected, use the UP (1) and DOWN (5) buttons to choose a relay and then the + (4) and
– (2) buttons to energise or de-energise respectively.
When finished, use the SELECT (3) button to return to the USER menu.
INHIBITING A SENSOR (14/3)
During maintenance, it is sometimes required to inhibit the alarms on a particular sensor. A front
panel LED will illuminate and inhibit relay will operate if any sensor or the system is inhibited (see
appendix 1 numbers 3 and 14.
Pressing SELECT (3) moves the selection to the CAN networked sensors and the buttons are used in
the same way.
Pressing SELECT (3) moves the selection to inhibit system for 30 mins. Any alarm or fault will be
inhibited. All relays will go back to their normal state. Press (1) to activate 30 mins maximum or
press (5) to deactivate. 30 min timer can be viewed when active on main screen.
8
GAS TYPE LIBRARY
O2 1 Oxygen 0-25% two falling alarms
CO2 2 Carbon Dioxide 1000ppm
CO2b 3 Carbon Dioxide 0-30%V
CO2a 4 Carbon Dioxide 0-2%V
H2S 5 Hydrogen Sulphide 0-50ppm
CO 6 Carbon Monoxide 0-250ppm
SO2 7 Sulphur Dioxide 0-10ppm
NO 8 Nitrous Oxide 0-100ppm
NO2 9 Nitrogen Dioxide 0-10ppm
Cl2 10 Chlorine 0-10ppm
H2 11 Hydrogen 0-1000ppm
HCN 12 Hydrogen Cyanide 0-25ppm
HCL 13 Hydrogen Chloride 0-10ppm
NH3 14 Ammonia 0-100ppm
O3 15 Ozone 0-2ppm
C2H4O 16 Ethylene Oxide 0-25ppm
CH4 17 Methane 0-1000 ppm
PH3 18 Phosphine 0-2ppm
LPG%Vol 19 Propane %volume
BUT%Vol 20 Butane %volume
FLAM%Vol 21 Flammable %volume
LPG%LEL 22 Propane %lel
BUT%LEL 23 Butane %lel
FLAM%LEL 24 Flammable %lel
WATER 25 0-100%
COb 26 Carbon Monoxide 0-1000ppm
NH3ppm 27 Ammonia 1000ppm
NH3%vol 28 Range 5.0% volume
HF 29 Hydrogen Flouride 0-10ppm
Temp 30 Temperature -5 to +50°C
UgM3 31 Microgram per metre cubed oil mist
B2H6 32 Diborane 0-1ppm
SiH4 33 Silane 0-5ppm
Ph3b 34 Phosphine 0-1ppm
F2 35 Flourine 0-5ppm
NF3 36 Nitrogen Triflouride 0-50ppm
LEL%/M 37 LEL per metre, 0-5%
SW Input 38 Switch input 0-100%
(Displays as SW input when not in Alarm, and SW Active when in Alarm.
Note: use channel text to describe this switches function).
refrig 39 0-1000ppm refrigerant (e.g. R22)
benzine 40 Benzine 0-100%LEL
flame 41 flame detector 0-100%
fire 42 fire detector 0-100%
humid 43 humidity detector 0-100%
smoke 44 smoke detector 0-100%
callpoint 45 callpoint detector 0-100%
H2 46 Hydrogen 0-2000ppm
CS2 47 Carbon Disulphide 0-100ppm
H2s 48 Hydrogen Sulphide 0-100ppm
NH35000 49 NH3 5000ppm
AcrylNitrile 50 Acryl Nitrile 0-25ppm
HCL 51 Hydrogen Chloride 0-30ppm
Sih4 52 Silane 0-50ppm
NH3200 53 Ammonia 0-200ppm
VOC20 54 0-20ppm
VOC100 55 0-100ppm
VOC1000 56 0-1000ppm
H2%LEL 57 H2 Flam 0-100%LEL
CO2_2000 58 CO2 0-2000ppm
HEXNEPPM 59 0-1000ppm
Usergas1 61 -
Usergas2 62 -
Usergas3 63 -
Usergas4 64 -
Usergas5 65 -
Usergas6 66 -
Usergas7 67 -
Usergas8 68 -
Temp 69 Temperature -20°C to +80°C
CO2_5%vol 70 Carbon Dioxide 0-5%VOL
9
DIMMING THE LED’S (11)
The LED’s on the main processor board and the LCD display are normally bright but can be
dimmed to give a more acceptable level of illumination in subdued control room conditions.
The DIM (6) button on the main panel when pressed will toggle the brightness between maximum
and dimmed for both. The level to which dimming occurs can be set via the User Menu number 11.
This shows the current brightness setting and then using the UP (1) and DOWN (5) buttons a new
dim level can be set and this is shown on the LCD and on the LEDs themselves. This dim value is
stored in none volatile memory for future use and subsequent power ups. In addition to dimming
the LED’s, the LCD backlight is also dimmed and to enable a balance between LCD brightness and
LED brightness. If a repeater is connected to the main panel then the dim levels are also activated
using the same buttons on the repeater.
MUTE THE BUZZER
When an alarm or fault condition occurs the buzzer on the main processor board will sound.
By pressing the ACCEPT button (1) on the front panel, the buzzer will become silent.
FLOW FAIL AND PUMP FAIL
The pressure of the pump(s) in the sample system are monitored and a loss of pressure is detected
and gives rise to a pump fault which is logged into the 99 event memory and will indicate flow fail.
Pump failure can occur from loss of power or from a worn out diaphragm. Preventative
maintenance should ensure that this event is rare.
LOCAL AND REMOTE RELAYS
The local relays are as follows (all contacts are rated at 5A 250Vac)
Common Over range alarm will energise if any gas is over range. S.P.C.O
Common High alarm will energise if any gas is in high alarm. D.P.C.O
Common Low alarm will energise if any gas is in low alarm. D.P.C.O
Fault will de-energise if any fault exists in the system. S.P.C.O
Option 5 will energise if voting 5 conditions are met. S.P.C.O
Option 6 will energise if voting 6 conditions are met. S.P.C.O
Option 7 will energise if voting 7 conditions are met. fault/S.P.C.O
Option 8 will energise if voting 8 conditions are met. S.P.C.O
A small relay on the front panel energises if a sensor is inhibited.
This includes “power up inhibit” periods.
10
MODBUS SET UP AND INDICATORS
Modbus is a means of obtaining data from the gas detection system via a MODBUS master
controller. The system is a SLAVE to the commands received from the master via two RS485 twisted
pair communication cables. When a command is received on one of these cables, the reply is sent
on the same cable thus giving rise to half duplex communication. For maintenance purposes, two
LED’s situated on the main processor PCB close to the connectors show when a reply is being sent
on that particular cable.
In a MODBUS system that makes use of both these cable, both these LED’s flash periodically
to indicate successful communication. Once the communication has started, the system will
monitor how long since the last command was received and if this is greater than 50 seconds a
communications failure (COMMS FAIL) alarm will occur.
Each system has an internal address, which is used both for Modbus address and CAN bus address
(see repeaters). This address and other parameters can be set and will be remembered at power up
using ENGINEER’S menu 27 Setup Network. The speed of communication (baud rate expressed in
bits per second) is set using menu 34.
All communicating devices in a Modbus system should be set to the same baud rate and the system
is capable of supporting 19200, 9600 and 4800 baud. 9600 is set by default.
MODBUS BAUD RATE
Using ENGINEER’S menu 34, the baud rate used by Modbus can be changed. Pressing UP (1)
and DOWN (5) will alter the baud rate. Pressing SELECT (3) returns you to the ENGINEER’S menu.
The Modbus protocol for the data packets received from a master is usually a request for specific
data to be sent back to the master. This protocol is covered in a separate document known as
MODBUS RTU protocol. In its simple form, the master will ask for the data kept in any of the 250
registers located in the system and will reply with the requested register data.
These registers are 16 bit numbers representing 0 to 65535 in decimal. A view of these registers
can be seen by using ENGINEER’S menu 1. UP (1) and DOWN (5) will display different register
numbers with the data. It is useful when first setting up the system.
Additionally, ENGINEER’S menu 4 allows you to view the Modbus data packets received and
transmitted. Again, this is used when first setting up the system and can diagnose requests and
responses.
See Modbus register definitions in the appendix. See C1148 for configuration.
11
REPEATER
It may be required to have a duplicate console sited elsewhere, such as a control room or
instrument room.
Using the CAN network, 4 core (2 data + 2 supply) cable, a repeater can be connected which gives
a user interface identical to the main panel. In fact the data displayed on the repeater board is
transmitted from the main panel.
Likewise, button pushes on the repeater are transmitted to the main panel and are used by the main
panel as if they had been pressed locally.
To ensure the correct operation of the repeater, it has to be set up in order to accept CAN from a
main panel and also to know where to send its own CAN data. It is a requirement that the CAN2
bus is used for repeaters leaving CAN1 for sensors and other devices.
Sensors are able to use CAN2 at the same time as a repeater providing that the addresses are
different.
From power up or by pressing the processor reset button on the repeater and pressing the SELECT
(3) button at the same time the following sequence will occur on the LCD after releasing the select
button.
Set THIS ADDRESS using the UP (1) and DOWN (5) buttons to choose a free address that the
repeater will use as its own address. Note this has to be different from that of the main panel (which
defaults to address 201)
Press SELECT (3)
Set FROM ADDRESS, this is the address of the main panel which will send LCD and LED data out to
this repeater to be displayed.
Press SELECT (3), the two addresses will be stored.
The repeater is now awaiting data from the FROM ADDRESS and it will display an error if the panel
does not receive data for 30 seconds.
To initialise communication between the main panel and the Repeater panel return to the main
panel unit and follow the instructions in the Set up network controller section of this manual.
RS232 DATA LOG OUTPUT
In addition to Modbus, an additional data stream showing actions within the system is available via
the RS232 output.
This consists of a 3 wire interface which can connect directly into the serial port (RS232) connection
on a PC which is a 9 way D-type female connector (not supplied). This should be wired to the
system as follows.
D-type Pin RS232 connector (Bottom left of PCB)
2 Tx
3 Rx
5 0V
Using Hyper-terminal on the PC set up at 2400 baud 8 bit no parity and no handshake,
the data output should appear on the screen and consists of any text which is being recorded in the
event log.
12
EVENT LOG (9)
The events listed in appendix 1 are logged internally in the system.
A total of 99 events can be stored and viewed later either on the LCD or on a PC using
Hyper-terminal.
When this 99 event memory is full, the oldest event is replaced by the new event so this history
of events always represents the last 99 incidents.
Using ENGINEER’S menu number 9, this event memory can be viewed one event at a time
using the UP (1) and DOWN (5) buttons to scroll through the sequence. Date and time of the
event is also displayed.
With the RS232 cable connected to the PC and Hyper-terminal in use at 2400 baud the whole
event log can be sent using ENGINEERING menu 28.
Using capture text in GDS Terminal, this event log can be saved to a file for future examination or
printing etc.
DATA TO AND FROM A PC USING GDS TERMINAL
Within the system there are parameters which have to be set such as the text which describes the
location of a particular sensor. Whilst these parameters can be set manually using the buttons,
it is quicker and easier to send a text data file from a PC using the RS232 interface via GDS
Terminal which can be downloaded from the GDS website.
The file which is sent is simple alphanumeric characters which can be edited using a simple
text editor like Notepad which is also standard on a Windows PC. This file can be created from
scratch but it is simpler to create it by sending the data already stored on the panel to the PC
again using GDS Terminal. This method is now described followed by how to reload the file back
into the main panel.
Using ENGINEER’S menu 30 (Data Panel to PC) and RS232 lead plugged into the PC COM
port.
On the PC, open GDS Terminal
Device
Panel (2400)
Comport 1 eg
Transfer and click RECEIVE
A filename is suggested to save data to. You can change this filename as required and do take
note of which directory it is going to be stored in. (Note: it is easier to save this file to the desktop
initially).
Using ENGINEER’S menu 30 (Data Panel to PC) press SELECT which should send data to the
PC. This data can be seen on the PC screen as it is transferred. When it is completed on the PC
use:
TRANSFER
STOP
This saves the data onto the hard disk in the folder specified previously. Each line of text (shown
in table below) in this file forms particular data as follows:
13
A line which does not start with a colon :or asterisk *is ignored which allows you to add
comments at any point in the text. Colon :indicates data for direct sensors, an asterisk *is used
to indicate addressable sensors.
Line Description
:T6, Port Hold 1 This line is the text for direct sensor 6 which will display on the LCD.
*T4, AccomBlock This line is the text for addressable sensor 4 which will display on the
LCD. For each of the 64 addressable sensors up to 20 characters can be
assigned.
:G1,%LeL^, This line selects a gas type for gas sensor 1 appropriate gas sensor must
be fitted in the system. All 16 direct types can be selected (Note: this does
not apply to CAN addressable sensors as they transmit their gas type to
the control panel.)
:HiAlarm 2,400 The high alarm point for direct sensor 2 is 400 divided by 10 (40.0).
High alarms can be set according to the type of gas and the value
represents 10 times the actual value (this is to avoid decimal points in
the data).
:LoAlarm 1,200 Ditto for sensor 1 low alarm point.
:OrAlarm 3,998 Ditto for sensor 3 over range alarm
:X This terminates the text transmission to the panel and should always be
at the end of the text. (Note: with the exception of :X, using *T, *H etc.
sets the parameters for addressable sensors) Text lines after :X is ignored.
If an :X is not included in the file then the panel will eventually time out but
this may take a few minutes.
Having edited the text to suit the installation, it can now be sent back to the panel using
ENGINEER’S menu 29 PC to panel.
Again, the GDS Terminal is used but this time the Transfer/Send text file option is used.
When prompted, choose your modified text file as the one to send and then the text should start
to flow. The output seen on the GDS Terminal screen consists of the command letters received so
strings of T or H, etc are seen which lets you know that all is well. The final letter seen will be an X
and at this point the new data sent is stored in non volatile memory on the processor board.
14
Addressable gas sensors
Use ENGINEER’S menu 10 (addressable zero span) to calibrate the addressable sensors. The
inhibit LED on all connected sensors will flash. Use the UP (1) and DOWN (5) buttons to look
at all sensor addresses which are being zeroed and use the + (4) or – (2) buttons to zero the
reading on each sensor.
Press the SELECT (3) button to enter the span mode which gives plenty of time to
visit each sensor. Gas each sensor with appropriate calibration span gas and return to the
panel.
Use the UP (1) and DOWN (5) buttons to view each sensor address and using the + (4) or –
(2) buttons, adjust the peak sensor reading to be that of the calibration gas. Press SELECT (3)
to exit this menu when all sensors have been adjusted.
Note: peak readings are lost when exiting from this menu. Re-enter the menu and use again to
calibrate any missed sensors.
Cell replacement on sensors
Should a sensor cell require to be replaced, the sensor should have its power removed before
changing the cell itself. Flammable (Catalytic) and Toxic cells have colour coded wiring which
is Pink, Yellow and White which should be connected correctly according to the markings on
the PCB. Data sheets C893, C894 & C323 at the end of this document detail the procedure for
setting up a new sensor independent of the panel and then when connected, follow the above
zero and span procedure.
SETTING ALARM LEVELS
The high and low alarm points for the sensors can be set manually using ENGINEER’S menu
15 for addressable alarm levels.
Menu 15 for addressable sensors
Use UP (1) and DOWN (5), to choose a sensor which requires an alarm change.
Use + (4) and – (2) to adjust the low alarm point.
Pressing SELECT (3) will then request you to set the High alarm point.
Pressing SELECT (3) again allows the Over Range alarm to be set.
Use the RESET button (7) to select RISING and FALLING alarm.
Pressing SELECT (3) again will exit the menu and save the parameters to memory.
15
ALARM RELAY OFF TIMERS
The 8 relays on the PCB are allowed to take time to de-energise. For example, this delay could
be used to keep fans running for a longer period after the gas alarm to allow a larger area to be
vented.
ENGINEER’S menu 24 allows each of the 8 relays to be selected by using the UP (1) and
DOWN (5) buttons and then for each relay use the + (4) and – (2) buttons to change the time
for delay in increments of 1 second. The minimum time is 1 second and max 255 seconds.
Additionally, the first 16 external relays can also have a time delay to de-energise which has
been output by an event or pattern.
Pressing SELECT (3) will save the delay times in non volatile memory and return to the
ENGINEER’S menu.
VOTING RELAYS
(NOTE: 4 OF THESE RELAYS ARE ALSO USED WITH TIME WEIGHTED ALARMS)
ENGINEERING menu 25 allows channels to be assigned to a group voting system.
8 relays on the main PCB will be activated according to the voting set up, and de-activated when
the condition has subsided and after the relay off timer has expired.
Using UP (1) and DOWN (5) to select the group, then use the + (4) and – (2) to select how
many alarms have to be active in this group to cause a relay to activate. e.g. group 2 may have
5 sensors in its group and 3 alarms are required to activate relay called High (G2).
On entering menu 25, the direct 4-20 channels are displayed. UP (1) and DOWN (5) buttons
will display which groups this channel is in whilst the + (4) and – (2) buttons change the channel
being viewed. If a channel was in groups 1 and 3 then the display would be 1-3-----. If it was in
groups 2, 3 and 7 then the display would be -23---7-. Pressing UP (1) or DOWN (5) changes
this selection so keep pressing until the correct grouping for your application appears. Any
channel can be in all groups and this would be displayed as 12345678.
Pressing SELECT (3) presents the Addressable channels for a repeat of the above. Groups can
contain a mix of sensors from 4-20 direct or Addressable channels.
16
TIME WEIGHTED ALARMS
(NOTE: THIS APPLIES TO OPT5,6,7,8 RELAYS)
Two types of time weighted alarms can be set using menu 31. STEL is a short time exposure level
which is a weighted average of gas level for the last 15 minutes. It is associated with one of the
four groups (5,6,7,8) of sensors. Each group may have any number of sensors within it and
whichever is the highest reading in the group, this reading is used to formulate the value of STEL.
LTEL is a long time exposure level taken over 8 hours and calculated in the same way as STEL.
Both STEL and LTEL have individual alarm settings but both act upon the same relay.
These alarms are rising only. Each gas must clearly be of the same type. If STEL or LTEL alarm
level is set to a value greater than zero, then this voting group becomes a TWA (Time Weighted
Average) group and the normal voting function is suppressed.
DEFAULTING THE PANEL
Individual sections of the panel can be defaulted rather than restoring all the defaults within
the panel. This is useful when one particular section of retained data needs to be reset. See
ENGINEER’S menu 32 for details.
DEFAULT THE WHOLE PANEL FROM POWER UP
At manufacture of a new processor board and possibly in service if a new set up is to be
installed, it is necessary to clear all system parameters and load default settings.
This can be done by pressing and releasing the processor reset button on the PCB at the same
time that the SELECT (3) button is pressed and held down. Release the SELECT (3) button when
the LCD displays the message “Initialising NVRAM”.
Clearly, this is only to be done if you are sure that a complete default is required. Always ensure
that a copy of the old set up is available in a text file which could be reloaded if needed.
17
INSTALLATION
The enclosure should be securely mounted to a substantial wall at chest height using the brackets
provided, its position should be such as to provide a clear field of vision of any alarm indications.
To position the enclosure a supporting tressel of the required height should be positioned to enable
two men to lift the enclosure on to the tressel following which the enclosure mounting brackets
should be located and attached to the enclosure and wall by either large screws or expansion bolts.
Equipment weight – 30kg – standard system.
Switch on the power. If the system is fitted with cabinet internal leak detector (auto shutdown device)
the system has to be manually started by pressing the push switch located on the internal power
supply unit). To prevent possible back pressure affecting the sensor readings vent tubes 2 x 4mm ID
should be kept as short as possible and have no reduction in total size.
The control unit is designed for installation in a safe area only. Positioning of the instruments
should be chosen with regard to the following points:
• Away from sources of local heat with room for adequate ventilation
• Within easy reach and audible distance of operating personnel
• Convenient to a separately fused power supply
• Incoming cables and outgoing alarm annunciation
MAINS OPERATED UNITS
• The equipment should be supplied from a 2A fused/switched spur.
• The spur unit should be identified and positioned locally to the equipment.
• To prevent lateral cable movement the mains cable within the enclosure should be restrained
using a clamp.
• Earth leads within the enclosure should be a minimum of 300mm longer than the mains Live
and Neutral cores
Field cables which are terminated within the control unit enclosure should be kept as short as
possible and not allowed to cross over electronic components or the ribbon cable.
The instrumentation should be subjected to a minimum of vibration and shock.
Ascertain the voltage rating of the power supply to which the instrument will be connected.
For further information relating to the installation and maintenance of gas alarm systems refer to
the IEC60079 series guidance documents.
18
SERVICE – ROUTINE ATTENTION
The owner or occupier of the site should place the supervision of the system in the charge of a
responsible executive, whose duty it should be to ensure the day to day operation of the system and
to lay down the procedure for dealing with a gas alarm or fault warning.
The operating instructions should be kept available preferably with the control unit, all faults, service
test and routine attention given should be recorded.
DAILY: A check should be made that any fault condition is being attended to and that all other
indicators are normal.
WEEKLY: Check the catch pot for high levels of particulate or excessive water contamination. On
sites involving a high risk process of having gases which may cause loss of sensitivity a check on
calibration should be carried out.
SIX MONTHLY MAINTENANCE
1. Zero check to gas sensor
2. Sensor to be gas tested and readings logged (sensitivity checked).
3. Field indicators to be tested.
4. Alarm trip points checked and re-aligned.
5. All faulty parts replaced where required.
6. All filter elements checked and replaced as necessary.
7. Power supply – voltage check.
8. Inspection made to confirm that all sample line fittings and equipment are secure, tight,
undamaged and adequately protected.
12 MONTHLY MAINTENANCE SCHEDULE
1. Six monthly check.
2. Pump overhaul (diaphragm replacement).
3. Auto Drain Unit (where fitted)
19
MENU FUNCTIONS BY NUMBER
1] View Modbus Reg
This allows inspection of the 250 internal Modbus registers. Use UP (1) and DOWN (5) buttons to alter the
register which is displayed in Decimal and Hexadecimal. SELECT (3) button will exit.
2] Set Clock
Using UP (1) / DOWN (5) and SELECT (3) allows the date and time to be changed. Note, if the CAN
communication connection is made to other panels, the time from the lowest address panel will impose itself
onto higher panels. So this means that the time should only be adjusted on the lowest address panel and
then this new time will appear on other higher address panels.
3] Inhibit all Sensors
Using UP (1) and DOWN (5) buttons, the direct or addressable sensors can be inhibited.
4] View Modbus TXRX
As a diagnostic tool for Modbus communications, this display shows the data packets received from a
Modbus master (RX) and the reply sent back from the panel (TX) This display is in Hexadecimal and to
understand the meaning, the Modbus data packet protocol has to be analysed. This menu is generally used
when first getting the Modbus system running.
Use SELECT (3) to exit this menu.
5] Set Refresh Rate
Use + (4) and – (2) to change the display refresh rate for sensor data on lines 1 and 2 of the
LCD. 1 is fastest and 10 is slowest. Pressing SELECT (3) will exit this menu.
6] Edit Company Text / Edit Fault Input Text
The fourth line of the LED display alternates between time and company text. This text can be
edited to show the site or installer details.
7] Lamp Test
This menu will illuminate all front panel LED’s.
When complete, the PCB buzzer will sound and the menu exits.
Note that the LED test is done with DIM active to save excessive current from the PSU.
8] Relay Test
The local group of 8 relays can be energised or de-energised using + (4) and – (2). Pressing
SELECT (3) allows the 64 (2x32) relay card to be tested. Press UP (1) and DOWN (5) to choose
which of the 64 relays to test and the + (4) button will energise it. The – (2) button will de-energise
the relay. The state or the relay can be seen via individual LEDs on this board. SELECT
(3) will exit the menu.
9] Event Log to LCD
The internal 99 event log can be viewed on the LCD display one event at a time.
Each line of the display indicates the following
Line 1 shows the type of event with the time of occurrence.
Types are FLT is a fault such as sensor 1 fail
Hi Alrm is high alarm
Lo Alrm is low alarm
SYS is a system event such as a panel reset
Line 2 and 3 show text relating to the event.
Line 4 shows which event is being displayed and how many events are logged.
e.g. 3 of 76 events means that the display is showing event 3 and 76 events are logged.
76 is the oldest event and 1 is the latest event.
Use UP (1) and DOWN (5) to choose which event to view.
SELECT (3) will exit the menu.
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