Sel M3000 User manual

Analog Alarm Annunciator M3000
User’s Manual
SELCO
Betonvej 11 –DK-4000 Roskilde
Denmark
Phone: [phone] - Fax: [phone]
e-mail: [e-mail]
www.selco.com

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Table of contents
1. INSTALLATION...........................................................................................................................5
1.1 Dimensions............................................................................................................................6
2. CONNECTION............................................................................................................................7
2.1 Power Supply.........................................................................................................................8
2.2 Inputs.....................................................................................................................................8
2.2.1 Voltage and Current Sources...........................................................................................9
2.2.2 Potential Free Contacts...................................................................................................9
2.2.3 Mixed Sensor Types........................................................................................................9
2.2.4 PT100, Thermocouples and Pressure Sensors..............................................................10
2.3 Open Collector Outputs........................................................................................................11
2.3.1 ALARM OUT .................................................................................................................11
2.3.2 SIREN...........................................................................................................................11
2.3.3 OUT1 - OUT14..............................................................................................................11
3. CONFIGURATION ....................................................................................................................12
3.1 Physical Input ......................................................................................................................14
3.1.1 Input Type .....................................................................................................................14
3.1.2 LCD Unit........................................................................................................................14
3.1.3 Input Lower Reference ..................................................................................................14
3.1.4 LCD Lower Reference...................................................................................................14
3.1.5 Input Upper Reference ..................................................................................................14
3.1.6 LCD Upper Reference...................................................................................................15
3.1.7 Miscellaneous................................................................................................................15
3.2 Logical Input ........................................................................................................................15
3.2.1 Average Calculation ......................................................................................................15
3.3 Alarm...................................................................................................................................16
3.3.1 Input Reference.............................................................................................................16
3.3.2 Set Point........................................................................................................................16
3.3.3 LCD Description ............................................................................................................17
3.3.4 Delay.............................................................................................................................18
3.3.5 LED...............................................................................................................................18
3.3.6 Output ...........................................................................................................................18
3.3.7 Flags .............................................................................................................................18
3.3.7.1 Block.......................................................................................................................18
3.3.7.2 Control Mode ..........................................................................................................19
4. OPERATION.............................................................................................................................20
4.1 Keyboard Dialog ..................................................................................................................20
4.1.1 Siren Deactivation .........................................................................................................20

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4.1.2 LED Reset.....................................................................................................................20
4.1.3 Output Deactivation.......................................................................................................21
4.2 Alarm Indication...................................................................................................................21
5. PROGRAMMING ......................................................................................................................21
5.1 Physical Input ......................................................................................................................22
5.1.1 Input Type.....................................................................................................................22
5.1.2 LCD Unit........................................................................................................................22
5.1.3 Input Lower Reference ..................................................................................................22
5.1.4 LCD Lower Reference...................................................................................................23
5.1.5 Input Upper Reference ..................................................................................................23
5.1.6 LCD Upper Reference...................................................................................................23
5.1.7 Miscellaneous................................................................................................................24
5.2 Logical Input ........................................................................................................................24
5.2.1 Average.........................................................................................................................24
5.3 Alarm...................................................................................................................................25
5.3.1 Input Reference.............................................................................................................25
5.3.2 Set Point........................................................................................................................25
5.3.3 LCD Description............................................................................................................26
5.3.4 Delay.............................................................................................................................26
5.3.5 LED...............................................................................................................................26
5.3.6 Output ...........................................................................................................................26
5.3.7 Flags .............................................................................................................................27
6. LOW-LEVEL CONFIGURATION...............................................................................................27
6.1 General Constants...............................................................................................................27
6.1.1 A00 - E²PROM Initialization...........................................................................................27
6.1.2 A01 - Function Test.......................................................................................................27
6.1.3 A03 - Device Number....................................................................................................27
6.1.4 A05 - RS232 Baud Rate................................................................................................28
6.1.5 A06 - RS485 Baud Rate................................................................................................28
6.1.6 A07 - Remote Reset......................................................................................................28
6.1.7 A08 - Output Follows Input............................................................................................28
6.1.8 A09 - Remote LED Test ................................................................................................28
6.1.9 A10 - Block....................................................................................................................28
6.1.10 A11 - M1000 Reset Function.......................................................................................28
7. SPECIFICATIONS ....................................................................................................................30
8. APPENDIX 1 - APPLICATION EXAMPLES...............................................................................31
8.1 Current Transmitter 4 - 20 mA..............................................................................................31
8.1.1 Connection....................................................................................................................31
8.1.2 Configuration.................................................................................................................31

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8.2 Potential Free Contacts........................................................................................................32
8.2.1 Connection....................................................................................................................32
8.2.2 Configuration.................................................................................................................32
8.3 Average Temperature Alarms (Engine Application)..............................................................32
8.3.1 Connection....................................................................................................................33
8.3.2 Configuration.................................................................................................................33
Important note:
This document contains information on a new product. Specifications and information herein are
subject to change without notice. Please advise SELCO for further details on latest developments.

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1 INSTALLATION
The M3000 is designed for flush mounting. Outside dimensions are H x W x D = 144 x 144 x
70mm. A cut out with dimensions H x W = 138 x 138mm must be made in order to install the unit in
the switchboard cabinet.
Make sure that there is enough space in the switch board cabinet behind the unit to install the plug-
in connectors and the cables. An installation depth of between 75 and 90mm is recommended.
The M3000 is secured to the switch board plate through the use of the 4 mounting/fixing brackets
included in the package.
Install the M3000 as described below.
Find a location in the switch board cabinet with enough installation depth to house the M3000
unit. Make sure that the selected location is also satisfactory from the operator’s point of view.
Keep in mind that it may be convenient to make room for the RS232 connection if you plan to
do external programming from a PC in the future.
Make a cut out with the dimensions H x W = 138 x 138mm in the cabinet plate.
Remove all the plug-in connectors located at the rear side of the unit.
Make sure the rubber gasket is in place behind the unit front plate. This gasket is necessary to
ensure compliance with the IP54 requirements.
Insert the unit into the cut out.
Place the 4 mounting/fixing brackets in the small rectangular cut outs located at the top and
bottom plates of the unit.
Tighten the 4 mounting/fixing brackets with a screwdriver until the unit is firmly seated.
Be careful not to make the connection cables too short. Extending the length of all cables with
around 100mm will ease any later service task.

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1.1 Dimensions
Cutout138x138mm
144mm
1
4
4
m
m
4.5mm
70mm

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2. CONNECTION
The M3000 includes a number of plug-in connectors. Each of these connectors houses a number
of screw terminals to which the cables are connected. The plug-in terminals can easily be attached
and removed without the use of any tools. The plug-in connectors include the connection terminals
for the power supply, the 24 sensor inputs and the 16 open collector outputs.
The figure below shows the rear side of the M3000 unit.
The M3000 includes 8 groups of input terminals. Each group is physically represented by a plug-in
connector that holds 3 input terminals, “IN1”, “IN2” and “IN3”, and one common reference terminal
“GND”. Be sure not to confuse the physical inputs with the logical inputs “INA”, “INB” and “INC”.
The logical inputs has no related input terminals, they are imaginary inputs intended for average
calculation based upon other inputs. The logical inputs are described later in this manual.
Alarm annunciation is done through 48 programmable alarms. Each alarm can be programmed to
monitor a physical or logical input. Alarm annunciation takes place when the input signal exceeds
the set point of the alarm. An alarm is able to control one LED and one open collector output.
Control of external equipment is possible through the use of 16 open collector outputs. 14 of these
outputs, “OUT1” to “OUT14”, are user programmable for alarm dependent control. The “SIREN”
output is mainly intended for the control of an acoustic warning device. An active “AL.OUT” signal
indicates that an alarm condition exists on the unit.
The M3000 includes two interface standards for serial data communication. The RS232 interface is
intended for point to point data communication between the M3000 and another device, e.g. a PC.
RS485 is intended for long distance bus communication between multiple M3000 units.
RS232
Used for remote
configuration with
the SELCO M3092
Programmer
ALARM / PROG
Switch to select
alarm or
programming mode
RS485
Used for
communication with
the SELCO H0300
Event Logger or
another bus system
ALARM / PROG
Switch to select
alarm or
programming mode
LCD contrast
8 input groups
Includes 3 input
terminals for
analog or digital
signals and 1
GND terminal for
common reference
16 open
collector
outputs
Power supply
and dimming

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The small switch on the left side of the rear panel is used to change between program mode and
alarm mode. In program mode the functions of the unit can be programmed. Alarm mode is the
normal alarm mode. The potentiometer at the bottom behind the front plate provides contrast
adjustment for the liquid crystal display (LCD).
2.1 Power Supply
The M3000 requires a supply of +24V DC. The supply wires must be connected between terminal
120 (+24V DC) and terminal 121 (GND). The supply voltage is required to be within the range of
+18V DC to +30V DC, this voltage range corresponds to ±30% of the nominal supply voltage. The
current consumption from the +24V DC supply is less than 400mA.
The power supply plug-in connector of the M3000 includes 3 terminals, one for +24V DC, one
GND reference and one terminal DIM for dimming of the LED’s on the front panel of the unit. For
dimming purpose a potentiometer of 100kΩ is connected between the terminal 122 (DIM) and
terminal 121 (GND).
The connection of the +24V DC supply and the potentiometer for dimming is shown below.
Important note: The power supply used for the M3000 and its interface components should be
operative and stable under all conditions. The M3000 is in most cases required to be operative at
all times - even under a possible “black out” condition.
2.2 Inputs
The M3000 includes a total of 24 inputs. Each of these inputs will accept the connection of one
sensor. The sensor can be a PT100 or a thermocouple supplying a current or voltage signal
through the use of a standard transmitter. It is also possible to connect a potential free contact to
an input. The sensors need not be for temperature, it is in fact possible to connect any sensor that
is, in some way, able to provide a DC voltage or current signal.
The input types are 10V DC, 24V DC and 0-20mA. Please note that the voltage on an input
terminal is measured according to the common reference of the unit (GND). The supply GND
terminal and the group plug-in GND terminals are connected together.
100K
DIM

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2.2.1 Voltage and Current Sources
Below are two examples. These examples show the two most common input configurations. The
figure to the left shows the connection of 3 voltage sources supplying a voltage within the range of
10V DC. The figure to the right shows how to connect 3 current sources.
2.2.2 Potential Free Contacts
The M3000 is capable of annunciating digital alarms. In this case the sensor will be some kind of
potential free contact. The potential free contact will actually control the connection of a voltage
source
The figure below shows 3 potential free contacts on the same input plug-in connector. The
reference of the contacts is +24V DC.
2.2.3 Mixed Sensor Types
The previous examples of how to connect different sensors involved a whole input plug-in
connector (3 inputs) at one time. However it is also possible to mix the sensor types within an input
plug-in connector. Please refer to the example below.
The example above shows 3 different sensors connected to the same input plug-in connector.
Input terminal “IN1” is connected to a potential free contact to +24V DC.
Input terminal “IN2” is connected to a current source.

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Input terminal “IN3” is connected directly to a voltage source providing a voltage difference
between “IN3” and “GND”.
2.2.4 PT100, Thermocouples and Pressure Sensors
Note that there is a wide range of transmitters on the market that provide an output signal of 4 to
20 mA. A transmitter of this type is actually a current source and should be connected as such. An
example describing the connection of a Kamstrup-Metro Flex Temp transmitter is shown below.
The connection of other 4-20 mA transmitters is similar to this example.
The transmitter shown above works like a current gate. It releases only 4mA at 0°C and 20mA at
100°C.
Two Danish companies that supplies 4-20mA transmitters:
Kamstrup A/S
Jacob Knudsens vej 12,
DK-8230 Åbyhøj
Phone: [phone]
Fax: [phone]
PR Electronics
Lerbakken 10,
DK-8410 Rønde
Phone: [phone]
Fax: [phone]
The SELCO PT100 6 Way Transmitter M1500 provides a cost-effective solution and includes 6
current transmitters in one box to be connected to PT 100 resistors. The following diagram shows
the connections of the M1500.
2.
24
4-20mA
PT100
OUT1
PT100 1.
4-20mA
GND
M1500
18
1
17
+
-
PT100
3 2
19
4
20
OUT4 4-20mA
GND
22
6 5
21
7
23
OUT5
4.
GND
OUT3 OUT2
PT100
3.
4-20mA 4-20mA
GND GND
14
30 27
5.
11
25
9 810
26
PT100
12
28
13
29
OUT6 GND
4-20mA
-+
15
31
16
32
PT100
6.

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The example below shows connections to one input group of M3000. For more details see
separate data sheet M1595.
2.3 Open Collector Outputs
The M3000 includes a total of 16 open collector outputs. Each output is capable of driving an
external LED or a relay. One output will indicate that an alarm is present on the M3000 and
another output is mainly intended for siren control. The remaining 14 open collector outputs can be
used for group alarms or alarm dependent control of external equipment. Open collector outputs
are digital outputs that are either on or off.
2.3.1 AL.OUT
The “AL.OUT” (115) output is an open collector output. Like all other open collector outputs, this
output is at GND level when active and at +24V DC level when inactive. The “AL.OUT” output is
active as long as one or more alarms are present on the M3000. If alarms are already present on
the unit when a new alarm is annunciated, the output is briefly deactivated for about 500 ms to
indicate the annunciation of a new alarm.
2.3.2 SIREN
The terminal marked “SIREN” (116) is an open collector output intended for controlling an acoustic
warning device. This output is activated to annunciate a new alarm. The output is deactivated by
the first press of the “C” key, located on the M3000 front plate. Output is at GND level when active,
and at +24V DC level when inactive.
The figure below shows how to connect a relay for control of the siren. The relay is shown in its de-
energized state.
2.3.3 OUT1 - OUT14
The M3000 includes 14 open collector outputs intended for general use. These outputs can be
programmed to activate upon annunciation of any one of the 48 alarms that the M3000 includes.
GND
20
PT100
1.
M1500
2
18
1
17
34
19
PT100
OUT1
2.
56
2122
78
24 23
GND
13
29
OUT2
PT100
3.
27
10 9
26 25
1112
28
OUT3
+
-
15
31
14
30
16
32

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An output is activated together with the annunciation of the controlling alarm. The output will stay
active until the operator acknowledges the alarm from the M3000 keyboard. Second press of the
“C” key will deactivate the output.
An output will operate according to an “OR” function if controlled by more than one alarm. This
means that an output will be active if either one of the controlling alarms is active.
The figure below gives an example of how to indicate the state of output 3 and 5 on two remote
LED’s. Normally the outputs are intended for driving relays.
The open collector output “AL.OUT” can be used to signal the appearance of multiple alarms
controlling the same output.
An open collector output will not drive anything. It works only as an electronic contact to GND.
3. CONFIGURATION
The configuration of the M3000 unit consists of a number of parameters that describe the set-up of
the 24 physical inputs, the 24 logical inputs and the 48 alarms.
The configuration of a physical or logical input includes parameters that describe the expected
signal type and range, the unit of measurement and the relationship between the input signal, in
volt or ampere, and the measurement in °C, kW or whatever unit that is to be measured. On top of
this the logical inputs have one additional parameter with 12 cells that holds references to the
inputs that takes part in the average calculation performed by the logical input.
The configuration of an alarm includes parameters that describe the reference of the input, to
which the alarm has been assigned, a set point (fixed or dynamic) that defines the level of alarm
annunciation, a delay and references to the LED and open collector output that are to be activated
in order to annunciate the alarm. A 10 character user defined text string holds the description of the
alarm.
The parameters of the configuration must be adjusted before the unit can be put into operation.
Note that it is only necessary to adjust the parameters of the active inputs and alarms. Inputs
having no connection to a sensor should be disabled by setting the input type parameter to “Off”.
Alarms that are not in use should have their input reference parameter set to “Off” as well.

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The configuration parameters are stored inside a non-volatile memory circuit (an E²PROM) located
inside the unit. The non-volatile memory is kept intact - even if power supply is disconnected for a
long period.
It is possible to program the configuration of the M3000 in two different ways. The first way is to
enter the configuration parameters directly from the front plate keyboard of the M3000. This
method is also referred to as “LCD programming”. During LCD programming, the configuration
parameters are displayed in the liquid crystal display while the operator is allowed to alter the state
of each parameter. The other way is to program the M3000 through the unit RS232 interface.
Important note: The switch located on the rear left side of the M3000 must be in program mode
(“PROG”) to allow programming from either the keyboard and/or the RS232 interface.
The procedure of LCD programming is much like the programming procedures that you might
already know from VCRs, televisions and other microprocessor based products. The operator is
able to move around between the configuration parameters through the use of a selection key.
Each parameter of the configuration can be modified by toggling, or by simply entering the new
value from the numeric keys of the unit keyboard.
RS232 programming involves the use of a standard PC with Windows 95, Windows 98, Windows
2000 or Windows XP operation system. SELCO has developed a user-friendly application called
the M3092 Programmer. This application enables the operator to program the M3000 through use
of the built-in RS232 interface. The parameters are entered in very much the same way as in a
Microsoft Excel Spreadsheet. This method of programming is ideal for setting up a M3000 from
scratch. The SELCO M3092 Programmer is validating all data that is entered, and all the
configuration parameters can be modified in the program. The configuration can be stored on disk
and it can be printed out for documentation. The data can also be exported to Excel.
Sensors are connected to the M3000 unit through the input terminals included in the 8 plug-in
connectors located at the rear side of the unit. Each of the 8 input plug-in connectors is referred to
as a “group”. Each group includes 3 input terminals named “IN1”, “IN2” and “IN3”, and one
common reference terminal named “GND”.
As mentioned earlier, a group refers directly to the 3 inputs located in an input plug-in connector.
Note however that each of the 3 physical inputs located in a group can be used with different types
of sensors.
Seen from a configuration point of view, each group also includes 3 logical inputs and 6 alarms.
The logical inputs are configured like the physical inputs but they have no related input terminal.
The logical inputs are used to do average calculations from up to 12 physical or logical inputs.
Each of the 6 alarms refers directly to a physical or logical input. The input does not have to be
within the same group as the alarm. It is possible to assign all 48 alarms to the same input.
Normally one would assign between one and 4 alarms to one input, two alarms would give every
one of the 24 physical inputs one low and one high level alarm.

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3.1 Physical Input
The parameters included in the configuration of a physical input are described below. The table
shows the parameters of the 3 physical inputs encapsulated in one group.
Inp:
InpTp:
LCDU:
InpLo:
LCDLo:
InpUp:
LCDUp:
Misc:
Inp:1
20 mA
˚C
4
0
20
600
0
Inp:2
10 V
kW
0
0
10
25
0
Inp:3
24 V
V DC
0
0
24
24
0
3.1.1 Input Type
The “InpTp” parameter defines both the type of input signal and the expected maximum range of
that signal. The range defined by the “InpTp” parameter must cover the expected range of the
signal provided by the sensor connected to the input. Example: “InpTp” should be set to 20 mA in
order to accept the connection of a 4-20 mA transmitter. Setting this parameter to “Off” will
completely disable the physical input.
3.1.2 LCD Unit
This parameter defines the unit of measurement. The parameter holds a combination of 4
characters. The selection of these 4 characters will not affect the operation of the M3000 in any
way, the contents of the “LCDU” parameter is only used for indication in the display.
Example, likely LCD units: “˚C”, “˚F”, “Volt” and “kW”.
3.1.3 Input Lower Reference
Defines the lower reference value of the input signal. The “InpLo” parameter is used together with
the “LCDLo” parameter to form the relation between the actual input signal, in voltage or current,
and the measured value expressed in the unit defined by the LCD unit parameter.
Example, consider the following parameter set-up:
InpTp: 20 mA LCDU: ˚C InpLo: 4 LCDLo: 0
This will tell the M3000 that a current signal between 0 and 20 mA is expected at the input terminal
and that the desired unit of measurement is degrees Celsius, indicated by the “˚C” in the LCD unit
parameter. The parameters “InpLo” and “LCDLo” indicate that 4 mA on the input should be
translated to 0 C in the LCD.
3.1.4 LCD Lower Reference
This parameter holds the low reference point of the measured value and defines a low reference
relation together with the “InpLo” parameter. Please refer to the prior explanation of the “InpLo”
parameter for further details.
3.1.5 Input Upper Reference
The “InpUp” parameter defines the upper reference point of the input signal. As with the lower
reference, the upper reference is used to form a relation between the actual input signal, in voltage
or current, and the measured value expressed in the unit defined by the LCD unit parameter.
Example, consider the following parameter set-up:

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InpTp: 20 mA LCDU: ˚C InpUp: 20 LCDUp: 600
The above configuration will inform the M3000 that a current signal is expected on the input. The
combination of the “InpUp” and “LCDUp” parameters forms the relation, 20 mA measured on the
input should bring the M3000 to show 600˚C in the LCD. Please refer to the description of the
“InpLo” parameters as well.
3.1.6 LCD Upper Reference
Defines the upper reference point of the measured value. This parameter works together with the
“InpUp” parameter to define a relation. Please refer to the above description on the other reference
points.
3.1.7 Miscellaneous
This parameter is intended for future use. At present the value has no affect on the operation of the
unit.
3.2 Logical Input
The parameters included in the configuration of a logical input are described below. The table
shows the parameters of the 3 logical inputs encapsulated in one group. Logical inputs are used
and referred to like physical inputs, but a logical input has no related input terminal. Logical inputs
are used to represent the average of the measurements collected from up to 12 other physical or
logical inputs.
Inp:
InpTp:
LCDU:
InpLo:
LCDLo:
InpUp:
LCDUp:
Misc:
Avrg:
Inp:A
20 mA
C
4
0
20
600
0
01 11
Inp:B
10 V
kW
0
0
10
25
0
02 21
Inp:C
24 V
V DC
0
0
24
24
0
07 Off
Please turn to the pervious description of the physical input parameters for an explanation of the
following parameters also included in the configuration of each logical input:
InpTp, LCDU, InpLo, LCDLo, InpUp, LCDUp and Misc
These parameters should always have the exact same value as the inputs included in the average
calculation performed by the logical input.
3.2.1 Average Calculation
The very reason for the existence of the logical inputs is the need for average calculation. One
logical input will perform an imaginary measurement that will correspond to the average of the
measurements from up to 12 physical or logical inputs.
Each of 12 input references can point to any physical or logical input. Input references that are not
required must be set to “Off” using the “C” key. In the example above “01 11” means that reference
# 01 points to group 1 input 1 (11). “02 21” means that reference # 02 points to group 2 input 1
(21). “07 Off” means that reference # 07 are not used and therefore set to “Off”.

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Important note: It is very important that all inputs referred to by the average parameter have
compliant parameter values assigned. The logical input itself must also comply with this rule.
Failing to do so may impose a significant error on result returned by the average calculation.
The average calculation of a logical input can be described by the formula below:
Average
IN
N
n
n
N


1
The variable “Average” represents the measurement on the logical input. “N” is the number of
physical and logical inputs that takes part in the average calculation (max. 12). “INn“is the
measurement of each physical or logical input. Note that the measurement of the logical input
equals the sum of all input measurement divided by the number of measurements.
Example, consider one diesel engine with 12 cylinders. The temperature measurement on each
cylinder could be picked up through 12 physical inputs. A logical input might then be used to
“measure” the average temperature on all 12 cylinders. It is also possible to use the average
temperature as a dynamic set point for one or more alarms.
3.3 Alarm
The parameters included in the configuration of an alarm are described below. The table shows the
parameters of the 6 alarms encapsulated in a group.
Alr:
InpRf:
Set:
Text:
Delay:
LE
D:
Outp:
Flags:
Alr:1
11
< 0
Freezing
100 x 10 ms
L01
O01
00000000
Alr:2
11
> 100
Boiling
100 x 10 ms
L01
O01
00000000
Alr:3
21
< 10
Low press
30 x 10 ms
L02
O02
00000000
Alr:4
22
> 10
High press
30 x 10 ms
L03
O02
00000000
Alr:5
31
> 1000
Overload
10 x 1 min
L14
Off
00000000
Alr:6
32
< 1A 30
Average
15 x 1 s
L15
Off
00000000
3.3.1 Input Reference
The “InpRf” parameter holds the reference to the input to which the alarm has been assigned. The
“InpRf” parameter includes two decimals, the first decimal holds the number of the group, and the
last decimal holds the number of the input.
Example: An input reference of “31” indicates a reference to input 1 (IN1) of group 3. Set this
parameter to “Off” to disable the alarm.
3.3.2 Set Point
The “Set” parameter defines the set point of the alarm. The set point describes the level and area
of alarm condition relative to the measured value. The set point is always expressed in the unit
indicated by the LCD unit parameter of the surveyed input.

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The set point parameter consists of an operator, a sign and a value. In some cases the sign is
replaced by a logical input reference.
The set point value can be a fixed value (e.g. a fixed temperature) or a dynamic reference with a
plus/minus offset. The average calculated by a logical input can be used as a dynamic set point.
The fixed valued used together with a dynamic reference indicates a plus/minus offset from the
measurement of the dynamic reference. In the example above for alarm 6 “1A” is the dynamic
reference and “30” is the plus/minus offset. The operator “<” will be disregarded in this case.
The function of a fixed set point is quite simple. The alarm is annunciated when the measurement
of the related input passes above or below the set point.
Input > fixed set point => Alarm or Input < fixed set point => Alarm
The matter gets a little bit more complicated with the dynamic set point. The figure below shows
the relation between the dynamic set point (the logical input) and the plus/minus offset.
The middle line in the above figure describes the dynamic set point. Note that the level of the set
point changes over time. It simply follows the measurement of the related logical input. The two
lines above and beneath the dynamic set point are the offsets. The offsets define the actual alarm
levels in relation to the dynamic set point. Alarm condition exists if the measurement of
the related input passes above the upper offset or below the lower offset. The measurement of the
related input is indicated by the dotted line.
Note that the related input is not included in the average, as this would influence the average value
in an unwanted manner for such applications.
3.3.3 LCD Description
This parameter holds a 10 character text that is shown on the LCD together with the actual
measurement and the alarm set point. The alarm text is only used for indication and the choice of
characters will not affect the operation of the M3000 in any way.
Upper offset
Alarm
Input ref.
Set point
Lower offset
Time
Level
Dynamic Set Point

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3.3.4 Delay
The alarm delay parameter can be used to prevent small spikes in the related input signal from
activating the alarm. Long alarm delays are useful for preventing frequent annunciation of less
essential alarms. An alarm condition will exist when the input signal has exceeded the alarm set
point for a time period longer than the time specified by the delay parameters. The alarm delay
consists of a time value and a multiplication factor.
Important note: It is very important that the smallest possible factor is selected to form the delay.
The factor will represent the resolution of the timer that operates the delay. A 10 seconds delay
should be made from a time value of 100 and a multiplication factor of 100 ms. Selecting a time
value of 1 and a multiplication factor of 10 seconds would result in a less accurate delay function.
The time value should normally be between 10 and 100. When using the M3092 M-Programmer it
is not necessary to worry about time value and multiplication factor. The delay should just be
entered in seconds and the program will take care of the rest. The minimum delay is 300 ms.
An alarm will be annunciated once the level defined by the alarm set point has been continuously
ex- or subceeded for the time defined by the alarm delay.
3.3.5 LED
The “LED” parameter holds a reference to the LED that is to be activated upon alarm condition.
Any of the 24 LED’s located on the unit front plate can be activated to visual annunciation of an
alarm, and one or more alarms can use the same LED for indication. Setting this parameter to “Off”
will disable LED indication for the alarm.
3.3.6 Output
Setting the “Outp” parameter will enable to unit to activate one of the 14 open collector outputs
upon alarm condition. The output can be used to control external lamps or relays. The “Outp”
parameter should be set to “Off” when no external control is required.
3.3.7 Flags
The 8 bits of the “Flags” parameter control specific alarm related functions. The 8 bits work like 8
programming contacts. A “contact” is on when the bit is set to one and the “contact” if off when a bit
is set to zero. The bits of the “Flags” parameter are numbered from 0 to 7; number 0 is the bit
furthest to the right.
3.3.7.1Block
Bit number 7, the first bit from the left, represents the status of the alarm block function. The
related alarm will be blocked by the block control input when this bit is set to “1”. Input terminal one
of group 8 can be configured to operate as the block control input. Please refer to the description of
the low level configuration.
Example: Most pressure alarms from an engine must be blocked until the engine has reached
normal revolutions. Without blocking the M3000 will report pressure alarm while the engine is off
duty (not running).

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3.3.7.2Control Mode
Bit number 6, the second bit from the left, represents the status of the alarm control mode. The
alarm will be in control mode when bit number 6 is set to “1”. Control mode is intended for level
dependent control of external equipment. External equipment can be connected to the 14 open
collector outputs of the M3000.
In normal alarm mode the open collector output (if any) of the alarm will be activated on alarm
condition, the LED (if any) of the alarm will be flashing and the two common collector outputs
“AL.OUT” and “SIREN” will be activated. The alarms will stay active until the operator
acknowledges the alarms from the M3000 keyboard or until the remote reset function is used.
In control mode the open collector outputs are used for level dependent control of external
equipment. The outputs are not considered as alarm outputs, only as control outputs. In control
mode no reset is needed to disable the LED and the open collector control output, when the
condition for the control signal no longer exists. The two common open collector outputs “AL.OUT”
and “SIREN” are not activated in control mode.
The LEDs controlled by “alarms” in control mode will not flash, they will have steady light for
“alarm” condition (exceeded set point), and no light for normal condition.
Control mode can be used for switching on and off heating, via one of the open collector outputs,
depending on the actual temperature. The heating will be switched on, once the temperature drops
below a pre-set level, and it will be switched off again when the temperature is back at the pre-set
level.
A delay on the “alarm” can be used as a kind of hysteresis in order to prevent frequent toggling
between heating on and off.
3.3.7.3Hysteresis Mode
This section describes the hysteresis function of the M3000. This function is available in the
M3000, if it has an EPROM date of 040101 (4 January 2001) or younger.
The hysteresis function is typically used for “alarms” in control mode (see previous section) to
switch on and off external equipment at a pre-set level with an adjustable hysteresis.
The hysteresis for an “alarm” is enabled by setting bit number 5 (third bit from the left) of the
“Flags” parameter for the “alarm” to 1. Setting it to 0 will switch off the hysteresis mode
Example: We want to switch on heating when temperature drops below 57C and switch it off
again when the temperature is above 63C. That means we want to switch on and off at 60C with
a hysteresis of 3C.
The actual hysteresis should be entered in percent as a General Parameter using the SELCO
M3092 M-Programmer or from the keyboard as described in the description of the low level
configuration.
In our case where we use a 4-20mA, 0-100C transmitter at the input, 3C is equal 0.6mA. The
0.6mA is equal 2.4% of the full-scale level 20mA.

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Hysteresis mode is enabled for all “alarms” where this hysteresis is wanted by setting bit number 5
of the “Flags” parameter to 1. “Alarms” set into hysteresis mode will now have a hysteresis of the
entered value (2.4% of full-scale level in the above example).
4. OPERATION
The M3000 unit is operated from the front plate keyboard. Some of the keys included in the
keyboard layout have different meaning depending on the operational state of the unit. Generally
the unit can be in one of two different operational states; alarm surveillance mode or programming
mode. Please make sure that the correct mode is selected on the switch at the rear side of the unit.
4.1 Keyboard Dialog
The figure below shows the various functions available through use of the unit keyboard.
4.1.1 Siren Deactivation
The siren is activated together with every new alarm annunciated on the M3000. Alarms not
controlling a LED or an open collector output are only indicated on the LCD, these alarms will also
cause the siren output to energize. The siren is stopped by the first press on the “C” key of the
M3000 keyboard.
4.1.2 LED Reset
Each of the 48 alarms of the M3000 can be programmed to control one of the 24 LEDs located on
the front plate. A LED will start flashing once the controlling alarm is annunciated. A flashing LED
indicates a new alarm that needs acknowledgment.
First press on the “C” key will stop the siren, second press will acknowledge the LED and change
the flashing to steady light, and the third press will turn off the LED providing the alarm set point is
no longer exceeded. Note that the second press will also disable any open collector output
controlled by the alarm.
Mode Selector
Used to switch between modes. During
alarm indication mode this key toggles
the indication between normal alarm
description and physical voltage or
current measurements.
Master reset, LCD test &
parameter selector
Stops the siren and performs master
reset during normal alarm mode. Used
for lamp test after pressing the “M”key
in normal alarm indication mode. Used
for parameter selection during
programming mode.
Numeric keys
While in normal alarm indication mode
the keys are used to toggle between
the alarms represented by the nearby
LEDs for indication in the LCD. Used
for entering numeric data into value
parameters during programming
mode.
Description covers the keys to the
right as well.
Alarm selector &
parameter toggle
While in alarm indication mode
these two keys are used to
select an alarm for indication in
the LCD. The arrow keys will
toggle the value of any multiple
choice parameter during
programming mode.
Backspace
Acts as a backspace key while
programming mode is active.
Operator selector
While in programming mode the
key will toggle between
sign/operator and value while
editing numeric data.