GDS Combi User manual

Combi
OPERATING
HANDBOOK
TECHNOLOGIES LTD
C925
Manual No.194D1C
Issue P.v2
www.gds-technologies.co.uk
Tel. [phone] Fax. [phone]
Email. [email protected]

1
N.B: (#) is the System menu option number
This document is non contractual and the equipment specification and detail may be modified at any time without prior notice.
Contents
Page
Contents ..........................................................................................................................................................................................1
System Overview ................................................................................................................................................................2
General Specification ..........................................................................................................................................................4
LED and LCD Indicators......................................................................................................................................................5
Buttons and Lockout............................................................................................................................................................7
Entering a password to get to User or Engineer mode ......................................................................................................8
• Default Passwords ........................................................................................................................................................8
• COMBI System Menu Index (see appendix #1 for brief description) ..........................................................................8
Direct and Addressable Line text ........................................................................................................................................9
Holding the Display..............................................................................................................................................................9
Testing the LEDs (7) and Relays (8) ................................................................................................................................10
Inhibiting a sensor (14)......................................................................................................................................................10
Changing the direct gas type (18) ....................................................................................................................................10
Gas Type Library ..............................................................................................................................................................11
Event to remote relay (23) ................................................................................................................................................12
Dimming the LEDs (11) ....................................................................................................................................................12
Mute the buzzer ................................................................................................................................................................12
Local and Remote relays ..................................................................................................................................................13
Modbus set up and indicators ..........................................................................................................................................13
Set Up Network ................................................................................................................................................................14
RS232 data log output ......................................................................................................................................................15
Event log (9) ......................................................................................................................................................................15
Data to and from a PC using Hyper-terminal ....................................................................................................................16
Real Time Clock ................................................................................................................................................................17
Refresh Rate ....................................................................................................................................................................17
Changing ‘Engineers’ Password........................................................................................................................................18
Calibrating Gas Sensors
• 16 direct 4-20mA gas sensors ....................................................................................................................................18
• 64 Addressable gas sensors ......................................................................................................................................18
• Cell replacement on Combi sensors - sensor calibration............................................................................................19
Setting the Time to Alarm ..................................................................................................................................................19
Setting Alarm Levels..........................................................................................................................................................19
Setting number of Decimal Places ....................................................................................................................................19
Setting the 4~20mA Deadband ........................................................................................................................................19
Alarm Relay off timers ......................................................................................................................................................20
Voting Relays ....................................................................................................................................................................20
Time Weighted Alarms ......................................................................................................................................................20
Defaulting Sections of the Panel ......................................................................................................................................21
Default the Whole Panel from Power Up ..........................................................................................................................21
Repeater (on CAN2 only) ..................................................................................................................................................21
Installation ........................................................................................................................................................................22
• Siting the Sensors
• Sensor Cable Routing ................................................................................................................................................24
• Equipment Installation Guides ....................................................................................................................................25
• Service – Routine Attention ........................................................................................................................................28
• Daily ............................................................................................................................................................................28
• Twice-yearly Maintenance Schedule ..........................................................................................................................28
• Action to be taken if the alarm activates ....................................................................................................................28
Appendix 1 (System Menu by number) ..........................................................................................................................29
Appendix 2 (Image of typical PC-Panel-PC text file) ......................................................................................................35
Appendix 3 (Modbus Register Specification for COMBI 16 channel + CAN system) ....................................................37
Appendix 4 (Event numbers) ..........................................................................................................................................37
Appendix 5 (Fuse Detials) ..............................................................................................................................................38
Fig. 1 (PC adapter (converts sensor data output to RS232 for PC System Configuration) ..........................................38
Fig. 2 (System Configuration & Mainboard to sensor wiring Diagram) ..........................................................................39
Fig. 3 (Combi Controller Network Configuration)……………………. ..............................................................................40
Fig. 4 (Combi Circuit Boards)..........................................................................................................................................41
Fig. 5 (System Wiring) ....................................................................................................................................................42
Fig. 6 (Enclosure Detail)..................................................................................................................................................42
Set up procedure for Flammable sensors (C893) .......................................................................................................….43
Set up procedure for Toxic sensors (C894) .................................................................................................................….45
Auxillary Equipment
Relay Switch Set-up C1179 ..............................................................................................................................................47
Channel 4~20mA C1147 ..................................................................................................................................................48
4~20mA Input C1180 ........................................................................................................................................................49
Combi Sensor - location / Gas type - Log ...................................................................................................................….50

System Overview
The COMBI is a 16 direct (4-20mA) plus 64 addressable channel gas monitoring system
which displays gas concentration and constantly checks for alarm conditions.
Each channel consists of a remote gas sensor located at the point where gas is to be
measured. The direct sensor types are individually wired back to the COMBI where as the
addressable sensors can be connected to a shared CAN bus network minimizing cable
requirements.
Each channel when connected becomes active and is recognized by the system and a
fault occurs if it becomes disconnected. This allows a system to be activated on an
individual sensor basis as commissioning takes place.
The gas types and alarm levels for Direct channels are set at the Combi panel but
addressable types transmit this information to the panel. However, alarm levels for
addressable sensors can be altered at the Combi panel or at the sensor itself.
Alarms can be individually set to be latched (requires reset button to clear) or unlatched
(self clearing).
The panel can be powered from mains or 24V dc input with battery backup terminals.
An output 24V 250mA terminal is available to power user devices.The battery input and
mains voltage is monitored and will create a fault if the voltage is too low but the user has
the option to disable these faults.
The Combi panel controls most actions and its dimmable backlit LCD display is capable
of indicating the state of gas measurements or fault conditions. Likewise, dimmable LED’s
internal and external give additional status information.
Many parameters including a text description of the location of a sensor are
programmable via user and engineer’s menus and retained when power is off. These
parameters are reloaded at the next power up so that the system will perform as it did
previously. The Combi panel also has two RS485 Modbus channels and can send data
when requested to do so to a Modbus master controller thus allowing independent system
management facilities.
Engineering menus allow for diagnostic monitoring of the Modbus transmit and receive
buffers. A remote repeater can also be connected which allows the LCD, LED’s and
buttons to be located elsewhere on a CAN bus as well as remaining functional on the
main panel. A network controller can also be connected which appears as a repeater but
to multiple panels connected to the CAN bus. A real time clock keeps track of time and
this time value is displayed on the LCD and appended to any panel events such as
alarms or faults etc. These events are retained in a 99 event memory which can be
viewed on the LCD or sent to a PC via the RS232 channel. Likewise this RS232 channel
can accept setup parameters from a PC and if needed can send the Combi parameters to
the PC as a simple text file which can be edited. Text is sent out via the RS232 channel
as an additional data logging facility. Events and gas level changes are the main types of
data presented which the user can capture using HyperTerminal (or similar) on a PC.
The current time is transmitted via the CAN bus and any addressable sensor will receive
it. Those addressable sensors with a local LCD display will show this time in addition to
the gas concentration data etc.
- If multiple panels are connected on CAN bus, then the panel with the lowest address
will send the time to the other panels.
2

3
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.
Button action on the Combi panel can be protected by a Key lockout connection to
prevent misuse. However, muting the buzzer which sounds if an event occurs can still be
silenced by pressing the ACCEPT button (1).
On board relays with voltage free contacts indicate alarm and fault states and additionally
these relays are used for voting whereby sensors can be grouped and the relay is
activated when a number of sensors have gone into alarm. The last four relays labeled
OPT5, 6, 7 and 8 can also be used for time weighted average alarms covering the
requirements of 15 minute and 8 hour measurements. Additionally, all 8 onboard relays
and the first 16 of the external relays have a programmable delay to de-energise
parameter which for example allows for fan evacuation of a space containing detected
gas. These relays and the first 16 relays on the remote relay board can be set to be
normally energised or de-energised.
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
these relays to be manually activated during commissioning.

4
General Specification
Direct 4-20mA sensors 16 Sensor Inputs (maximum) - source
2 Wire sensor Power = 0.6W
3 Wire sensor Power = 1.7W
Addressable sensors 64 Sensor inputs (maximum) (CAN network – 4 wire)
end of line termination required. 1.7W per sensor
Internal Sensor Supply 24V.DC – 3A / 70W
(Loading) Systems exceeding 70W sensor load should be powered from an external
24V power source. (See auxiliary power pack [260W]
Price code: 200-003)
Sensor types Electrochemical - Infra Red - Pellister
Sensor cable Addressable CAN bus, 4 Core 1.5mm screened
Direct 2/3 core 0.5mm screened
Power supply 230/115Vac 50/60Hz +/-15%
24-28Vdc or Battery (external charger)
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’
PCB LED’s include: ‘DC Fail’, ‘AC Fail’, ‘Sensor Fail’, ‘CAN Fail’, ‘Modbus Fail’,
‘Watchdog’, ‘System Inhibit’, ‘O/R’, ‘Hi Alarm’, CAN1/2, RS232, and
‘24V’/’12V’/’5V’ rails
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
Combi Panel Outputs 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’
OPT G8 LTEL/STEL relay SPCO or ‘Group 8’
Sounder relay SPCO
(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 on both Motherboard and Front panel
Remote sounder (optional)
Dimensions (H) 265mm x (W) 315mm x (D) 100mm
IP rating IP52 optional IP65
Enclosure Mild steel powder coat BS00A01
IP52 (optional IP65)
Cable entry Bottom / Rear 20mm push-outs
Weight 5Kg
Terminals Field terminals 2.5mm
Operating temperature 5 to 40˚C
Features Remote reset Keylock
Remote repeater panel (option)
operating distance 1km
16way 4-20mA catalytic converter panel (option)
Multiple panels using the network controller (option)
32 way CAN relay panel (option)

5
LED and LCD indicators
A four line 40 character LCD displays a range of information typically shown below.
Line 1 Standard 4~20mA sensor, values and gas type and location
Line 2 Addressable sensor, values and gas type and location
Line 3 General information, Number of Alarms, Faults and Connected sensors
E.g. D=4 means 4 direct sensors connected
E.g. A=6 means 6 addressable sensors connected
Line 4 Date and Time alternating with user text.
The top line displays the direct 4~20 inputs indicated by D. This will cycle through all
active 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.
To restart the cycle press the –button (2) or RESET (7)
The second 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 third line displays the number of alarms and faults present in the Combi system.
Normally these are zero. Additionally, the number of 4-20 and Addressable sensors in the
system are displayed.
The fourth 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, eg company name and telephone number.
Direct
sensor
Gas Value
D4 20 %LEL xxxxxxxx xxxxxxxxxxx
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
}
Continuously
updating
display lines
alternating user text
display (programmable)

6
The LEDs local to the panel are as follows:
Alarm Internal/ Colour Description
External
Or Alarm I Red on if any sensor currently has an over range alarm
Lo Alarm I Red on if any sensor currently has a low alarm
Hi Alarm I Red on if any sensor currently has a high alarm
DC fail I Amber on if battery is low
AC fail I Amber on if mains has failed
Sensor fail I Amber on if any sensor has failed
CAN fail I Amber on if any addressable sensor has stopped communicating
Modbus fail I Amber on if the Modbus master has stopped communicating
System Inhibit I Amber on if the system is not checking alarms
Sensor Inhibit X Amber on if any sensor has been inhibited
Watchdog I Amber on if the processor has had a watchdog reset
Power I Green on if power applied
Fault X on if a fault exists
Alarm X on if alarm exists
(I = view internal X = view external)
If the fault or alarm LED is flashing, this indicates a new event and when accepted by
pressing the UP (1) button it remains on (not flashing).

7
Buttons and Lockout
7 user buttons are provided on the front to allow control and setting up of the Combi
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.
To prevent unauthorised use of the buttons, Key lock input is provided on the main
processor PCB, and the buttons are locked out of use when this terminal is connected to 0V
(adjacent terminal) Even when locked, the buzzer can still be muted by pressing the
ACCEPT button (1).
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 should be removed for normal operation.

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 ENGINEERʼS 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.
Combi System Menu Index See Appendix 1 for further details.
Note: User menu only contains items shown in red. 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 8

9
Direct and Addressable Line text
The Combi system measures data on all active sensors.
Direct sensors are done sequentially but addressable sensors send their data periodically
when available (every few seconds).
Each sensor has a text description (stored on the main pcb, not in the sensor) which
describes physically where it is in the system and this text appears on the LCD as the
most recent measurement is displayed. Using the engineer’s menu, this text can be
altered from the default text to something more meaningful.
Editing this text is either manual using buttons and the LCD or by sending a text file from
the PC. The latter is much faster and is preferred. The manual mode is activated from
ENGINEER’S menu 17 which presents the direct 4-20 channels text first followed by the
Addressable text.
Pressing + (4) or – (2) changes which channel is to be altered and pressing UP (1) enters
the text editing mode for this channel. The + (4) and – (2) buttons now move a cursor
under the text and UP (1) and DOWN (5) alter the character at this cursor position. When
editing is finished for this channel, press SELECT (3) to exit the editing which returns to
allow changes on another channel by pressing the UP (1) button again. Alternately
pressing SELECT (3) will exit the direct 4-20 channel text and enter the Addressable
channel text selection. Again the buttons are used in exactly the same way to change the
text description for networked Addressable sensors.
SELECT (3) when pressed will exit the manual mode and save the text changes in non
volatile memory on the main PCB and return to the ENGINEER’S menu.
See also DATA to and from a PC using Hyper-terminal which allows a much quicker
method of editing using a PC.
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.