Oldham MX15 User manual

Installation and Operating
Manual
MX 15
SINGLE CHANNEL
CONTROLLER
Part Number: NPM15GB
Revision: C.0
The Fixed Gas Detection Experts

Table of Contents
ii
Copyright 2016 by Oldham
April 2016
All rights reserved. Reproduction in any form, in whole or in part, without the
express written consent of Oldham is strictly prohibited.
The information contained within this manual is true and correct to the best of
our knowledge.
Due to ongoing research and development, the specifications of this product
may be changed at any time without notice.

Table of Contents
iii
TableofContents
Chapter 1 │General Information ...................................................1
The User’s Guide......................................................................................... 1
Symbols used.............................................................................................. 1
Safety Warnings .......................................................................................... 2
Important Information .................................................................................. 2
Limitation of liability ..................................................................................... 2
Chapter 2 │Genaral Introduction..................................................3
Purpose of the controller ............................................................................. 3
View: Front .................................................................................................. 3
View: Internal............................................................................................... 4
View: Rear................................................................................................... 5
Chapter 3 │Installation and wiring ..............................................7
Mounting the controller ................................................................................ 7
Wiring.......................................................................................................... 7
Chapter 4 │Operating instructions .............................................13
Display indications for start-up................................................................... 13
Channel measurement display .................................................................. 13
Menus........................................................................................................ 13
Chapter 5 │Cleaning, servicing and maintenance.....................19
Cleaning .................................................................................................... 19
Maintenance and servicing........................................................................ 19
Fuse replacement...................................................................................... 20
Parts.......................................................................................................... 20
Chapter 6 │Declaration of Conformity........................................21
Chapter 7 │Technical Specifications..........................................23

iv
MX 15
Instruction Manual
Chapter 8 │ Particular Specifications.........................................25
Specifications for mechanical and
electrical installations in Explosive Zones.................................................. 25
Metrological specifications......................................................................... 25
Connecting detectors other than
Oldham detectors to the MX 15 controller ................................................. 26
Markings:................................................................................................... 26

1 –General Information
1
Chapter 1 │General Information
The User’s Guide
Please read the following notice carefully before installation and start-up,
paying particular attention to the end-user safety instructions. This user’s
guide should be distributed to every individual involved in the start-up, use,
maintenance or repair of the system. The information contained in this
manual, the data and technical drawings are correct as of the date of
publication. Should questions arise, please contact Oldham for additional
information.
This manual is designed to provide users with simple and precise information.
Oldham shall not be held responsible or liable for any misinterpretation that
may result from the reading of this manual. Although every effort is made to
ensure accuracy, this manual may contain unintentional technical
inaccuracies.
On behalf of its clients, Oldham reserves the right to modify the technical
characteristics of its equipment without notice to improve product
performance. This user manual and its contents are the inalienable property of
Oldham.
Symbols used
Icon
Meaning
This symbol indicates useful additional information.
This symbol indicates:
This equipment must be grounded.
This symbol indicates:
Safety grounding terminal. A cable of adequate diameter must
ground any terminal with this signal.
This symbol indicates:
Caution: In the current operating mode, failure to adhere to
the instructions preceding this symbol can result in a risk of
electric shock or death.
This symbol indicates:
Please refer to the instructions.
Double isolation.

2
MX 15
Instruction Manual
European Union (and EEA) only. This icon indicates that in
accordance with Directive DEEE (2002/96/EC) and with the
regulations of your country, this product may not be disposed with
household waste.
Dispose of this product at a collection site intended for electrical
waste, for example an official EEE (Electrical and Electronic
Equipment) collection site with a recycling or take-back program
for authorized products available to consumers whose purchases
replace old EEE products with new equivalents.
Failure to comply with regulations for the disposal of this type of
waste can be harmful to the environment and to public health, as
EEE products typically contain potentially hazardous substances.
Your complete cooperation in the disposal of this product will help
to ensure a more efficient use of natural resources.
Safety Warnings
Icons have been placed on the central controller to call attention to general
use safety precautions. These labels are an integral component of the central
controller. Replace any label that has peeled off or become illegible. The
meanings of these labels are explained below.
Installation and electric connections should be performed by a
qualified professional, according to Oldham's specifications and to
the standards of authorities in the field.
Failure to observe these rules may result in serious injury.
Exactness, particularly regarding electricity and assembly
(couplings, network connections) is imperative.
Important Information
The modification of any component or the use of any third party components
will automatically void any and all guarantees.
The central controller is intended to be used for precise applications of a
technical nature. Exceeding the indicated values is strictly prohibited.
Limitation of liability
Neither Oldham nor any other affiliated organization shall be held liable under
any circumstances for any damage whatsoever including, without limitations,
damages for loss of production, interruption of production, loss of information,
controller failure, personal injury, loss of time, money, or materials, or for any
indirect or consecutive consequence of loss occurring during the use of the
product or the inability to use the product, even in the event that Oldham had
been informed of such damages.

2 –General Introduction
3
Chapter 2 │Genaral Introduction
Purpose of the controller
The MX 15 measurement and alarm controller is intended for simple
installations that do not require an electrical cabinet.
The MX 15 controller can be connected to combustible or toxic gas detectors,
or oxygen detectors.
The measurement from the detector is displayed on the MX 15 and compared
to the alarm thresholds. In the event that the measurement exceeds the
threshold, the controller activates the relays which can control external
components.
View: Front
The MX 15 controller is composed of the following components:
■An enclosure with access cover (Figure 1, ref. E) for the settings (zero,
sensitivity);
■A motherboard (Figure 2) for all of the system components (power, display,
relays and connectors) ;
■A front plate (Figure 1, ref. D) with sector status and alarm indicators (A),
LCD screen (B) and touch keys (ref. C).
Figure 1: Full view of the MX 15 controller.

4
MX 15
Instruction Manual
View: Internal
Figure 2: Internal view.
Ref.
Function
See page
A.
Programming circuit (Explo 340 mA or 4-20 mA).
9
B.
F8 Fuse (5x20, 250 V AC - 630 mA T) with 24V DC power supply.
9
C.
F7 Fuse (5x20, 250 V AC - 100 mA T) with 230 VAC power supply.
8
D.
Secondary ground connection.
E.
Sector power supply terminal (230 V AC or 110 V AC upon request) with
the following identifications: L (phase), N (neutral) and (ground).
8
F.
Power terminal block 24 V DC (0, + 24V).
8
G.
Terminal block connection with remote acknowledgment (dry contact
NO).
8
H.
Terminal block detector connection.
9
J.
Sensitivity settings.
16, 17
K.
Zero adjustment.
16, 17
L.
Configuration jumper (J17) for Fault relay.
- NC: Fault relay contact closed in alarm mode.
- NO: Fault relay contact open when not in alarm mode.
9
M.
Configuration jumper (J19) for RL1 relay.
- NC: RL1 relay contact closed in alarm mode.
- NO: RL1 relay contact open when not in alarm mode.
9
N.
Fault relay terminal block. Contacts CT, 250 V AC –2A. Contact status
not in alarm mode as defined by J17 (ref. L).
9
P.
RL1 alarm relay terminal block. Contacts CT, 250 V AC –2A. Contact
status not in alarm mode as defined by J19 (ref. M).
9
Q.
RL2 alarm relay terminal block. Contacts CT, 250 V AC –2A . Contact
status not in alarm mode as defined by J18 (ref. R).
9
R.
Configuration jumper (J18) for RL2 relay.
- NC: RL2 relay contact closed in alarm mode.
- NO: RL2 relay contact open when not in alarm mode.
9

2 –General Introduction
5
View: Rear
Figure 3: Rear view
Ref.
Function
See page
A.
Mounting rail (DIN format)
B.
Fixing the enclosure to the rail
C.
Stop for removal of the enclosure; pull downward to release.

6
MX 15
Instruction Manual

3 –Installation and wiring
7
Chapter 3 │ Installation and wiring
Mounting the controller
The MX 15 should be mounted on a DIN rail (see Figure 3), with 5 cm of free
space on every side of the controller.
The MX 15 controller may be installed in any area except for explosive
atmospheres, ideally in a monitored area (security office, control room,
equipment room, etc.), in a dry (no condensation) and temperate area (see
page 23).
The unit’s access panel should be forward facing, so that settings, monitoring
and wiring can be easily accessed.
Figure 4: Dimensions of the controller
Wiring
Also refer to the Particular Specifications chapter on page 25.
The controller meets Class II surge protection and Degree 2 pollution
requirements.
The electrical connection must:
■Be carried out by a specialist and (with the controller) with the power
supply disconnected (electric power cut) ;
■Respect the current regulations (NF C 15-100) ;
■Use a power cable connected to the grid (230 VAC) with a minimum
diameter of 1.5 mm² and a maximum diameter of 2.5 mm2.

8
MX 15
Instruction Manual
Verify the current and the grid power supply: the grid power supply must
correspond to the supply indicated on the controller front plate.
The MX 15 does not have an on/off switch.
Certain power supplies can cause serious or fatal injury. All
installation and wiring should be performed before turning on the
power supply.
Incorrect installation can lead to measurement errors or system
failure, all instructions in this manual must be followed carefully to
guarantee proper system operation.
Functional ground connection
The controller must be connected to a functional ground connection.
The ground terminal (yellow) (Figure 2, ref. D) is indicated with the following
symbol: .
Refer to the wiring examples on pages 10 to 12.
Power
The controller must be protected upstream by a differential bipolar circuit
breaker with a nominal current of 0.5 A. The response curve must be type D.
Power supply 230 V AC
Protection is provided by fuse F7 (Figure 2, ref. C). The sector power supply
must be wired to the two terminals marked L (orange) and N (blue) (Figure 2,
ref. E) as indicated by the wiring examples on pages 10 to 12.
Power supply 115 V AC
Protection is provided by fuse F7 (Figure 2, ref. C). The sector power supply
must be wired to the two terminals marked L (orange) and N (blue) (Figure 2,
ref. E) as indicated by the wiring examples on pages 10 to 12.
Power supply 24 V DC
The 24 V DC power supply is connected to the terminals marked 0 and +24V
(Figure 2, ref. F) as indicated by the wiring examples on page 9. This input is
protected by fuse F8 (Figure 2, ref. B).
Measurement Channels
Sensors
The different types of sensors should be connected to terminals C1, C2 and
C3 (Figure 2, ref. E) as indicated by the wiring examples on page 9.
Wheatstone bridge 3 active wire explosive gas detectors
■C1: mid-point (signal).
■C2 : detector filament (-).
■C3 : compensator filament (+).

3 –Installation and wiring
9
4/20 mA 2 active wire sensors/transmitters
■C1 : signal (return to ground).
■C2 : not connected
■C3 : power supply (+24 Volts).
4/20 mA 3 active wire sensors/transmitters
■C1 : signal (return to ground).
■C2 : power supply (0 Volts).
■C3 : power supply +24 Volts.
Note
■Each type of sensor has a different programming circuit (Explo 340 mA or
4-20 mA) installed during manufacturing (Figure 2, ref. A).
■Each line may be connected to a maximum of 5 OLCT 10 toxic gas
sensors. In this case, circuit programming must be (Figure 2, ref. A)
completed by trained staff.
Alarm relays
The MX 15 controller uses two alarm relays which correspond to two instant
pre-programmed alarm thresholds.
The relays are energized, or with a powered coil with no gas alarm activated
(negative security available on request) and voltage-free. REL1 terminals
correspond to the REL1 relay contacts (alarm 1). REL2 terminals correspond
to the REL2 relay contacts (alarm 2).
The relay contacts can be used "normally open" (NO) or "normally closed"
(NC) by flipping the corresponding switch (Figure 2, ref. M or R).
Refer to the wiring examples on pages 10 to 12.
Relay fault
The fault relay is energized and voltage-free. Terminals marked DEF
correspond to fault relay contacts (trouble).
The relay contact can be used "normally open" (NO) or "normally closed" (NC)
by flipping the corresponding switch (Figure 2, ref. L).
Refer to the wiring examples on pages 10 to 12.
Remote acknowledgment
A remote acknowledgment button can be connected to the MX 15 controller at
the terminals marked Acknowledgment (Figure 2, ref. G) (dry, voltage-free
contacts) at a maximum distance of 2 meters.
Refer to the wiring examples on pages 10 to 12.
Wiring examples
The following pages contain examples of wiring.

10
MX 15
Instruction Manual
Figure 5: MX 15 controller and two OLCT 10 sensors for detection of the same toxic gas
(maximum 5 sensors).
Sector
230 VAC
0V DC
+24 V DC
Acknowledg
ment button
■Relay contact output (voltage-
free).
■NO or NC depending on the
position of switches J17, J18
and J19.

3 –Installation and wiring
11
Figure 6: MX 15 controller and two type OLC 10 TWIN sensors.
Sector
230 VAC
0V DC
+24 V DC
Acknowledgment
button
■Relay contact output (voltage-
free).
■NO or NC depending on the
position of switches J17, J18
and J19.

12
MX 15
Instruction Manual
Figure 7: MX 15 controller and a 3-active wire EXPLO or TOXIC sensor.
Sector
230 VAC
0V DC
+24 V DC
Acknowledgment
button
■Relay contact output (voltage-
free).
■NO or NC depending on the
position of switches J17, J18
and J19.

4 –Operating instructions
13
Chapter 4 │Operating instructions
Display indications for start-up
When starting up the controller, the following indications will be displayed:
■Software version
■Maintenance access code
■Programmed alarm thresholds
■Stabilization time
■The measurement from the sensor
Channel measurement display
The MX 15 controller displays the measurement continuously. It is possible to
hide the measurement by pressing the and buttons on the keyboard
together. The MX 15 will then display ‘--- OK’.
To return to the measurement display, press or .
Menus
Reminder: for security reasons, only trained personnel should be
authorized to use the following menus.
Viewing the menus
To quit normal operating mode and view the list of menus:
■Press the MENU button ( ).
■Using the , and buttons, enter the standard access code 1000.
■Using the " + " or " - " ( or ) buttons, view the available menus to see:

14
MX 15
Instruction Manual
Menu
See page
PROGRAMMING (PRG)
14
FAC (factory settings)*
-
START UP (STA)
15
CODE (COD)
15
BUZZER (BUZ)
16
TEST (TST)
16
*The FAC menu is not described here as it is reserved exclusively for Oldham's use.
Do not use this menu without prior training.
Menu Confirmation
■Bring up the desired menu as directed in the Viewing the menus
paragraph.
■Confirm the menu by pressing ENTER().
Exiting a menu (ESCAPE)
Press the "+" and "-" ( and ) buttons together and validate or reject the
changes:
■Press ENTER ( ) to quit without saving the changes.
■Press "+" ( ) and then ENTER ( ) to quit and save the changes made.
Programming Menu
A maintenance key is displayed while the programming menu is being
used. This menu allows the user to program measurement channel
configurations such as:
■Start/Stop: blinking yellow LED.
■Chemical symbol for the gas detected (CH4, CO, etc.).
■Unit of measure (%LIE, ppm, etc.).
■Measurement scale and decimal point (0.1, 1.0, 10, 100, 1000, etc.).
■Programming the two gas alarm thresholds. The corresponding red LED
alarm will light up during this stage.
■Options for clearing gas alarms:
1. Manual (MAN). If the gas level comes back down to below the preset
alarm threshold, the alarm will need to be manually acknowledged by
pressing the Acknowledge button .
2. Automatic (AUT). If the gas level comes back down to below the preset
alarm threshold, the alarm will be acknowledged automatically.
■Time delay (in minutes and seconds) for alarm relay triggering. Blinking
yellow LED light.
Figure 8: depiction of alarm triggering.
Alarm threshold
exceeded
LED alarm
and buzzer
Delay
Alarm relay
switching

4 –Operating instructions
15
■Time delay (in minutes and seconds) for alarm relay triggering: the yellow
LED is on continuously.
■Time delay for connecting the unit to the power supply (blocking the
relays): the yellow LED blinks and the icon is displayed.
■Indication of the type of sensor used, such as:
- Bridge: in Bridge (filaments), types OLC 10, OLC 100, etc.
- EXP: EXPLO (explo. 4/20mA), type OLCT 10, etc.
- Fire: fire (ionic, optic, etc.).
- O2: oxygen.
- Oth: others (toxic, etc.).
■Indication of maintenance mode, MAN or AUT:
- AUT: detection of detector calibration mode using this function (yellow
blinking LED light on the MX 15).
- MAN: no detection of detector calibration mode.
■Time delay (in minutes and seconds) upon exiting the Calibration menu
(blocking the relays).
■Validation of the settings changed in this menu:
- NO: changes have not been implemented.
- YES: new programming will be saved.
Initialization Menu (INI) - Start-up
This menu is used to start up the microprocessor.
It is used in the following situations:
■By Oldham when shipping new material.
■At the initial installation.
■When changing a sensor or a detector.
Code Menu (access)
This menu allows the user to modify the access code (set as 1000 when
shipped) for the different menus:
■Display the CODE menu (press the "+" and "–" [ and ] buttons at the
same time).
■Confirm the code by pressing ENTER ( ). The current code will be
displayed.
■Enter the new code with the "+" and "–" ( and ) buttons.
■Confirm the new code by pressing ENTER ( ).
■Confirm the code (Yes, No, ENTER ).

16
MX 15
Instruction Manual
Buzzer Menu
Allows the user to use or not use the buzzer integrated into the MX 15 unit.
■Display the BUZZER menu by pressing on the "+" and "-" ( and )
buttons at the same time.
■Confirm by pressing ENTER ( ).
■Select ON (buzzer activated) or OFF (buzzer deactivated).
■Confirm (Yes, No, ENTER ).
TEST Menu (TST)
Allows the user to block the relays integrated into the MX 15 when performing
gas tests or calibrating the detector.
■Display the TST menu by pressing on the "+" and "-" ( and ) buttons
at the same time.
■Confirm by pressing ENTER ( ): the yellow LED will blink.
■The yellow LED blinks, the message TST and the key will appear,
confirming that the alarm relays are blocked during test operations or
calibration.
Caution: this menu should only be used for calibration after the first
start-up.
Reminder: for safety reasons, only trained personnel are authorized
to perform the procedures listed below.
Procedure for an explosive gas detector (OLC 10, OLC 100, etc.)
■Ensure the TEST menu is confirmed (see above).
■Remove the access panel to the settings on the MX 15 faceplate to access
the setting potentiometers.
■Adjust the zero setting if necessary using the zero "0" potentiometer
(Figure 2, ref. K). Read the instructions indicated on the display.
Reminder: ensure that the air in the environment is clean. If not, using the
calibration kit, inject reconstituted air (do not use nitrogen) into the detector
at a rate of 60 litres per hour, then wait for the stabilization measurement.
■Inject the calibration gas (60 l/h) at sensor level and wait for stabilization
measurement.
■Confirm the value on the display and adjust the sensitivity using the "S"
potentiometer (Figure 2, ref. J).
■Remove the tank of calibration gas.
■Wait for the display measurement to return to zero.
■Press the TEST button ( ) to exit this menu.
■The yellow LED will turn off and the display will show a dotted line.
■If necessary, press one of the "+" or "-" ( or ) buttons, to bring up the
measurement.