Seitron RXA01M User manual

RXA01M0001SE 031134 141118
1
RXA01M
8-ZONE INDUSTRIAL CONTROL UNIT
• Power supply 230V~ or 12Vdc
• Possibility of connecting a Backup system
• Possibility of connecting up to 8 4..20mA gas transmitters
• Nor (Normal) or Rev (Reverse) relay logic set-up
• Pre-alarm and Alarm thresholds set-up on two ranges
• Enabling/Disabling of each individual input
• Visual and acoustic signals in case of abnormal events
• Conforms with EMC 2014/30/EU, LVD 2014/35/EU and
RoHS2 2011/65/EU
1
eser t
742 3 5 6 8
1
1 1
1 1
1 A
Fig. 1: External aspect.
Fig. 3: Cable entry instructions.
8
Cable entry through
bottom openings.
7
Cable entry through upper
slots.
Fig. 2: Internal view and parts.
283 mm
B
5 2
2
96 mm
6
314 mm
125 mm
23 mm
21 mm
C 6
F1
F2
Via del Commercio, 9/11. 36065 Mussolente (VI) - IT LY
Tel.: [phone] - Fax.: [phone]
http://www.seitron.it - e-mail: [e-mail]

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RXA01M0001SE 031134 141118
WARNING
• This control unit IS NOT suitable for installation in ATEX classified zones.
• We strongly recommend using shielded cables if installed in environments with strong EMC disturbances.
• This device must be installed and the electric connections made by qualified technicians and in compliance
with the technical and safety standards in force.
• Connect the device to the power mains using a two-pole switch that conforms with the standards in force and
with an opening distance of the contacts of at least 3 mm in each pole.
• Make sure to disconnect power to the plant before making the electric connections on the control unit.
• The installer is responsible for setting up a detection system conform with existing National and European
standards and for choosing adequate load types to connect to the control unit, as well as correctly configure
the system parameters. Contact the distributor if in doubt.
Fig. 5: Diagram of connection with control unit powered through an external 12Vdc power supply unit with buffer battery.
4..20mA 4..20mA
INPUT
PREALARM ALARM
12V=
POWER
161514 3735 36
CH1 CH8
S SN
SUPPLY
1
S1
3
S
2
S8
S
3 2 1
(FLT)
4
N
230V~
L
1 2 1312
BATT
N.O.
E.V.
3
SIREN
5
COM L N.C. N.O. N.O. N.C. COM
6 87
(PRE)
COM N.C. N.O.
9 10 11
(ALR)
230V~
FAN
230V~
FAULT
12Vdc
POWER SUPPLY
BACKUP
INPUT
BATTERY
SIREN 230V~
FAN 230V~
E.V. N.O. 230V~
FAULT PRE-ALARM ALARM
Fig. 4: Diagram of connection with control unit powered at 230V~.
N
L
230V~
1
L
BATT
COM N.C. N.O. N.C. COM N.O. N.C. COM N.O.
8
2
N
4
3 65 7
E.V.
N.O.
3
911 10 13
12 14
(FLT)
FAULT
(PRE)
PREALARM
(ALR)
ALARM
CH8CH1
S1
S
2 1
S8
S
23 1
1615
S
36
S
35 37
4..20mA 4..20mA
SUPPLY
POWER
INPUT
12V=
230V~
FAN
230V~
SIREN
BATTERY
SIREN 230V~
FAN 230V~
E.V. N.O. 230V~
FAULT PRE-ALARM ALARM
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RXA01M0001SE 031134 141118
TECHNICAL FEATURES
Power supply: 230V~ -15% +10% 50/60 Hz
or
12Vdc ±15% (through external
power supply unit with buffer
battery)
Absorption: 24VA - with 230V~ power supply
and 8 transmitters connected
or
20W - with 12Vdc power supply
and 8 transmitters connected)
Fuses (F1 and F2): 1AF (quick - 5x20 format)
Type of transmitters: 4..20mA Transmitters (SX series)
for fuel gas, such as Methane,
Petrol vapour and LPG (50% or
100% L.E.L.) or toxic, such as CO
(500ppm).
Pre-alarm threshold field: See table 1 on page 5
Alarm threshold field: See table 1 on page 5
Contacts capacity: 3 x 5A 250V~ SPDT
Contact free from voltage
Protection rating: IP 20
Operating temp.: 0°C .. 40°C
Storage temp.: -10℃.. +50°C
Humidity limits: 20% .. 80% RH (non-condensing)
Enclosure: Material: ABS UL-V0 self-extinguishing
Colour: Signal White (RAL 9003)
Weight: ~ 1350 gr.
powered by the same source at 12Vdc, this must be able to
provide adequate current, therefore have adequate power,
equal or greater than the total power absorbed by the
system. The power source with 8 devices connected must,
therefore, be able to continuously supply at least 1A.
The electronic circuit is protected by two 1A quick fuses.
F1 ( of Fig. 2) protects the control unit power supply at
230V~ F2 ( of Fig. 2) protects the power supply of
transmitters only.
The PRE, ALR and FLT outputs have exchange contacts
and can be used to drive generic loads such as a siren or a
flashing device or, based on the configured system, a gas
shut-off solenoid valve.
Please note that all control units are free from voltage;
they do not supply power to the loads giving the user
greater freedom to use loads with different operation
voltages.
Inputs CH1, CH2, …, CH8 are used to connect the
transmitters to the control unit.
The maximum number of transmitters that can be
connected to the control unit is 8 and they must be of
4..20mA output type.
WARRANTY
In the view of a constant development of their products, the manufacturer reserves the right for changing technical data
and features without prior notice. The consumer is guaranteed against any lack of conformity according to the European
Directive 1999/44/EC as well as to the manufacturer’s document about the warranty policy. The full text of warranty is
available on request from the seller.
B
C
SIGN PROBABLE CAUSE SOLUTION
LED '~' does not switch on although
the control unit is powered at 230V~.
Fuse F1 is blown ( of Fig. 2); one
or more loads connected at 230V
have caused a short-circuit.
Replace fuse F1 with an equivalent
one, same type and capacity (see
technical features) and verify the
The red LEDs from 1 to 8 and the
yellow LED ' ' are on.
Fuse F2 is blown ( of Fig. 2); one
or more faulty transmitters have
caused a short-circuit.
Replace fuse F2 with an equivalent
one, same type and capacity (see
technical features) and verify the
TROUBLESHOOTING
B
C

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Pre-alarm relay (FLT).
This status is signalled by switching on the yellow LED ' ',
by switching on the red LED corresponding to the input to
which the transmitter that detected the abnormal event is
connected and by the activation of the buzzer with
continuous sound.
The control unit continues to supervise the system.
BACK-UP SYSTEM
To guarantee the highest safety level, the control unit can
be powered through an external 12Vdc power supply unit
with buffer battery that assures operation even in case of a
black-out.
In this case, the power supply LED '~' is always off.
For the electrical wirings please read the paragraph
'Electrical connections'.
PERIODIC CHECK
We recommend periodically checking the proper operation
of the entire detection system, control unit + transmitters, by
applying gas to each transmitter and checking the displayed
value.
Refer to the regulation in force in the country of installation.
INSTALLATION
Carry out the operations below to install the device:
- Remove the 6 screws indicated in Fig. 1 and remove
the front panel.
- Fix the device base to the wall using the two holes for
screws indicated in Fig. 2
Carefully check that the circuit is disconnected from
the 230V~ power mains while working with tools near
the electric parts, and make sure not to damage the
circuit or the surrounding components.
- Make the electric connections as indicated in the
paragraph 'Electric connections' in accordance with the
diagrams in Fig. 4 and Fig. 5.
- The cables can be introduced in three ways:
Cables enter from rear :
Using a screwdriver, remove the base wedges as
indicated in Fig. 2. Now introduce the cables through
the openings in the base, up to the clamps.
Cables enter from the lower edge (slots between lid and
base) :
Using suitable pliers, remove the plastic tooth indicated
by the arrow in Fig. 3 and, after having connected the
cable to the proper clamp, bend it as indicated in Fig. 3,
lock the cables using the specific cable clamps.
Cables enter from the lower edge (cracks on base) :
Pass the cables through the lower slots of Fig. 3.
Connect the cables to the right clamps and lock the
cables with the specific cable clamps.
- Close the device by placing the front back on the
container and fixing the six fastening screws.
ELECTRICAL CONNECTIONS
Carefully read below and compare with the wiring diagram
of Fig. 4 showing the disposition of the terminals, the
internal circuit and the connections with the external
components.
The control unit can be powered with 230V~ through
terminals L and N (making sure terminal N is connected to
Neutral) or with 12Vdc connecting an external power supply
unit with buffer battery to the 'BATTERY' terminals (respect
polarity).
Warning: the control unit does not supply current to the
'BATTERY' terminals (it does not charge the battery wired
to it).
Should the control unit and the connected transmitters be
GENERAL INFORMATION
This device is a gas control unit equipped with 3 Outputs
with exchange contacts (pre-alarm, alarm and fault relay)
able to configure and control up to 8 gas concentration
transmitters, carbon monoxide (CO), Methane, Petrol
vapour and L.P.G., with 4..20mA output.
The control unit and transmitters' status (normal operation,
pre-alarm, alarm or fault) will be shown through the LEDs
on the front.
START-UP
OUTPUTS SWITCH-ON AND ACTIVATION
LED '~' o ' ' flashes for 50 seconds indicating the pre-
heating phase of the transmitters, upon application of power
supply, based on the applied power supply.
The Pre-alarm, Alarm and Fault outputs are deactivated
during this phase.
LED '~' o ' ' remains on with permanent light after the
pre-heating time.
Activating the outputs is characterised by switching on the
'RDY' LED, in accordance with the set-up made on
connector JP4 (see page 3).
RESET KEY ( of Fig. 1)
The use of this key located on the front (Fig. 1) depends on
the 'LATCH' dip-switches made set-up and of connector
'JP4' (see paragraph 'JUMPER AND DIP-SWITCH
SET-UP').
If enabled, keeping it pressed for at least 5 seconds in
either case restores the control unit to normal operation
after an abnormal event or black-out.
ACOUSTIC SIGNALS
The control unit is fitted with an internal buzzer allowing it to
emit acoustic signals should an abnormal event be
detected. The user cannot exclude the acoustic signals.
TRANSMITTERS STATUS DISPLAY
By switching on LEDs from 1 to 8, together with LEDs
' ' on the front cover, the control unit signals the
status of the connected transmitters.
The LED number corresponds to the relative CH- output
number (e.g. LED 1 corresponds to output CH1).
Pre-alarm Status (' ' red LED on)
This status is activated if a transmitter sends a greater gas
concentration level than the set Pre-alarm threshold.
Activating the Pre-alarm status activates the Pre-alarm
relay (PRE).
This status is signalled by switching on the red LED ' ', by
switching on the red LED corresponding to the input to
which the transmitter that detected the abnormal event is
connected and by the activation of the buzzer with
intermittent sound.
The control unit continues to supervise the system.
Alarm Status (' ' red LED on)
This status is activated if a transmitter sends a greater gas
concentration level than the set Alarm threshold. Activating
the Alarm status activates the Pre-alarm relay (ALR).
This status is signalled by switching on the red LED ' ', by
switching on the red LED corresponding to the input to
which the transmitter that detected the abnormal event is
connected and by the activation of the buzzer with
continuous sound.
The control unit continues to supervise the system.
Fault Status (yellow LED ' ' on)
This status is activated if a transmitter sends a Fault signal
to the control unit. Activating the Fault status activates the
RXA01M0001SE 031134 141118
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2
7
7
8
6
6
1
A
RXA01M0001SE 031134 141118
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JUMPER AND DIP-SWITCH SET-UP
JP1 Connector - Fault relay logic set-up
D
JP1
FLT
NOR
REV
NORmal relay logic (default).
COM - N.O.: normally open.
COM - N.C.: normally closed.
JP1
FLT
NOR
REV
REVersed relay logic.
COM - N.O.: normally closed.
COM - N.C.: normally open.
JP2 Connector - Pre-alarm relay logic set-up
E
JP2
PRE
NOR
REV
NORmal relay logic (default).
COM - N.O.: normally open.
COM - N.C.: normally closed.
JP2
PRE
NOR
REV
REVersed relay logic.
COM - N.O.: normally closed.
COM - N.C.: normally open.
H
Connectors for enabling the CH1 .. CH8 inputs
Each input is fitted with a connector that, if adequately
set, enables or disables the relative input. Should an
input be unused (is not connected to a transmitter) it
must be disabled, otherwise the control unit will signal
an alarm status for that input.
These connectors are placed above the terminals of
the relative input (see figure).
JP--
INH
ACT
Channel disabled - INH - (default).
INH
ACT
Channel enabled - ACT -.
JP--
G
JP4 Connector: Power Up set-up
Sets the method of activation of the outputs (pre-alarm,
alarm and fault) upon application of power supply or
after a black-out.
The outputs are automatically enabled after
the pre-heating time.
PWR
UP
OFF
ON
PWR
UP
OFF
ON
The outputs are enabled after the pre-
heating time, only if the operator presses
the 'reset' key for about 5 seconds.
Set this mode if human intervention is
requested to reset operation after a black-
out.
Switching on of the green LED 'RDY' located on the
front, indicates that the outputs are active and the
control unit ready to control the entire system.
JP3 Connector - Alarm relay logic set-up
F
JP3
ALR
NOR
REV
NORmal relay logic (default).
COM - N.O.: normally open.
COM - N.C.: normally closed.
JP3
REVersed relay logic.
COM - N.O.: normally closed.
COM - N.C.: normally open.
ALR
NOR
REV
D
E
F M
Fig. 6.
LG
H
I
F1
F2

RXA01M0001SE 031134 141118
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JP5 Connectors: pre-alarm and alarm thresholds
range set-up
L
RANGE
X1
X2
Pre-Alarm and Alarm X1 Range (mA).
See table 1.
RANGE
X1
X2
Pre-Alarm and Alarm X2 Range (mA).
See table 1.
DIP-SWITCH LATCH - alarm status memory set-up
The alarm status memory can be set for each input
through the 'LATCH' dip-switches.
This function controls the alarm output (ALR) and the
visual and acoustic indications.
Each dip-switch corresponds to relative input: e.g.
dip-switch no. 1 corresponds to input CH1, dip-switch
no. 2 corresponds to input CH2, and so on.
Note
▲: dip-switch positioned at ON (upwards)
▼: dip-switch positioned at OFF (downwards)
DIP-SWITCH 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8
▲ Should the gas concentration drop below the set
alarm threshold, with the dip-switch set at ON
mode the alarm relay, the relative LEDs and the
buzzer will go back to normal operation status only
if the Reset key is pressed for 5 seconds.
Set this mode if human intervention is requested to
reset operation after an alarm status has been
detected.
▼ Should the gas concentration drop below the set
alarm threshold, with the dip-switch set at OFF
mode (default setting) the alarm relay, the relative
LEDs and the buzzer will automatically go back to
normal operation status.
I
1 2 3 4 ALR 5 6 7 8
LATCH
The table on page 5 shows the Pre-alarm and Alarm
thresholds values that can be set (X1 o X2).
WARNING
Since different transmitters with 4..20mA output can be
wired to the Control Unit, with different full range and
detected gas, all thresholds are meant in mA.
Setting example
The wired transmitter has different full range and detected
gas.
The installer needs to set the prealarm threshold at:
4% L.E.L., for 0..50%L.E.L. full scale transmitters
10% L.E.L., for 0..100%L.E.L. full scale transmitters
50ppm, for 0..500ppm full scale transmitters
Proceed as follows:
1. Set the Prealarm threshold.
The prealarm threshold to set must be a trade-off
between the desired value and those who can be
actually set, as shown in table 1.
In this example, assuming as a priority the 4% level, the
actual values which can be set and which are closest to
the desired value are:
4% L.I.E., for 0..50%L.E.L. full scale transmitters
8% L.I.E., for 0..100%L.E.L. full scale transmitters
40ppm, for 0..500ppm full scale transmitters
2. Set the Alarm threshold.
In this case the alarm threshold to be set, read in table 1
in the two ranges X1 and X2, is placed between the
following values:
Or
When the outlined choice is selected:
16% L.I.E., for 0..50%L.E.L. full scale transmitters
32% L.I.E., for 0..100%L.E.L. full scale transmitters
160ppm, for 0..500ppm full scale transmitters
set the jumper JP5 on X2 and set the pins of the dip-switch
as shown in the table.
1 2 3 4 5 6
DIP-SWITCH - Pre-alarm and Alarm thresholds
set-up.
The Pre-alarm and Alarm thresholds that will be applied to
all connected transmitters can be set using these
dip-switches.
The thresholds are expressed in mA regardless of the type
of gas detected by the connected transmitters (LPG,
METHANE, Petrol vapour and CO).
The Pre-alarm threshold is set through the number 1, 2 and
3 dip-switches combination, while the Alarm threshold is set
through the number 4, 5 and 6 dip-switches combination.
The Alarm threshold value is always greater than the
Pre-alarm threshold one.
M
1 2 3 4 5 6
TABLE 1: Pre-alarm and Alarm thresholds set-up.
Note: ▲= dip-switch positioned at ON (upwards)
▼= dip-switch positioned at OFF (downwards)
RXA01M0001SE 031134 141118
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