Eaton MTL 9492-PS-PLUS User manual

MTL 9492-PS-PLUS
Intrinsically safe power supply
January 2022
INM MTL 9492-PS-PLUS Rev 3
Instruction manual
MTL intrinsic safety solutions

ii INM MTL 9492-PS-PLUS Rev 2
DECLARATION OF CONFORMITY
A printed version of the Declaration of Conformity has been provided separately within the
original shipment of goods. However, you can find a copy of the latest version at
http://www.mtl-inst.com/certificates

iii INM MTL 9492-PS-PLUS Rev 2
CONTENTS
DECLARATION OF CONFORMITY ................................................II
GENERAL SAFETY INFORMATION .............................................. IV
1 FEATURES ...................................................................1
2 DESCRIPTION ..............................................................1/2
3 DIN-RAIL INSTALLATION METHOD ...............................................3
3.1 Protection of equipment ......................................................................3
3.2 DIN rail mounting............................................................................3
3.2.1 Mounting power supplies on DIN rail .......................................................4
3.2.2 Wiring up power supplies.................................................................4
3.2.3 Ambient temperature considerations .......................................................5
3.3 Power bus - Installation and use................................................................5
3.4 Earth rail and tagging accessories ..............................................................6
3.4.1 Parts list ...............................................................................6
3.5 Assembly ...................................................................................8
3.5.1 Fitting earth rails ........................................................................8
3.5.2 Fitting tagging strips .....................................................................8
3.5.3 Completed assemblies ...................................................................9
4 BACKPLANE MOUNTING VARIANT..............................................10
4.1 Accessories ................................................................................10
4.2 Protection of equipment .....................................................................10
4.3 Backplane mounting ........................................................................10
4.3.1 Surface mounting – with kit SMS01 .......................................................12
4.3.2 T- or G-section DIN-rail mounting –with kit DMK01 ...........................................12
4.4 Backplanes – identification and tagging ........................................................12
4.4.1 Backplane identification labels............................................................12
4.4.2 Tagging strip mounting kit (TSK08) ........................................................12
4.5 Backplanes - earth rails ......................................................................14
4.5.1 Earth rail kit (ERK08) ....................................................................14
4.6 Backplanes – power supply connections ........................................................14
4.6.1 Single backplane .......................................................................14
4.6.2 Interconnection of power supplies for multiple backplanes ....................................14
4.7 Fitting MTL 9492-PS-PLUS modules to backplane ................................................14
4.7.1 Installation- Figure 4.15..................................................................14
4.7.2 Module removal- Figure 4.16 .............................................................14
5 ENVIRONMENTAL ............................................................16
6 WASTE REMOVAL INFORMATION ...............................................16
7 APPROVALS .................................................................16
8 ATEX, UKEX & IECEX CERTIFICATION INFORMATION ...........................17/18

iv INM MTL 9492-PS-PLUS Rev 2
GENERAL SAFETY INFORMATION
Safety instructions for installation and operating personnel
The operating instructions provided here contain essential safety instructions for installation personnel
and those engaged in the operation, maintenance and servicing of the equipment.
WARNING !
A ‘WARNING’ marked in this way is provided for operator and plant safety and MUST be followed.
CAUTION !
A Caution is provided to prevent damage to the instrument.
NOTE
These are used to guide the user in the operation of the instrument.
Before commencing installation or commissioning:
• Read and understand the contents of this manual
• Ensure installation and operating personnel have received adequate training for this task
• Ensure that any operating instructions are fully understood by the personnel responsible.
• Observe national and local installation and mounting regulations (e.g. IEC 60079-14).
WARNING !
These assemblies may not be used in explosion-hazard area applications if they have been used
previously in general electrical installations.
WARNING !
The responsibility for planning, installation, commissioning, operation and maintenance, particularly
with respect to applications in explosion-hazard areas, lies with the plant operator.
During operation:
• Make the relevant instructions available at all times to the operating personnel.
• Observe safety instructions.
• Observe national safety and accident prevention regulations.
• Operate the equipment within its published specification.
• Servicing, maintenance work or repairs not described in this manual must not be performed without
prior agreement with the manufacturer.
• Any damage to this equipment may render its explosion protection null and void.
• No changes to any of the components that might impair their explosion protection are permitted.
If any information provided here is not clear:
Contact Eaton’s MTL product line or an authorised distributor or sales office.
NOTE
Improper installation and operation of the enclosure can result in the invalidation of the guarantee.

1INM MTL 9492-PS-PLUS Rev 2
1 FEATURES
• Isolated power supply
• Zone 2 mountable
• DIN-rail or backplane mounting
• ATEX / UKEX / IECEx approvals
• 480mA @10.0V DC- Ex ia IIB output
• 550mA @11.9V DC- Ex ib IIB output
• Power over Ethernet option (PoEx)*
• Multiple outputs achieved by ganging MTL 9492-PS-PLUS modules using 24V DC
power distribution backplane
*Note – PoEx is a simple adaptation of the IEEE 802.3af Power over Ethernet (PoE)
standard to bring the benefits to the 9400 Range of Hazardous Area devices.This
allows two spare pairs in the existing Cat5e cable to distribute the power supplied
to a 9466 Ethernet Switch (Power Sourcing Equipment – PSE) to each of the devices
connected to its five ports (PD – Powered Device). This adaptation is necessary due to
restrictions for Hazardous Area use. It is not implied that the device conforms to the
802.3af (PoE) standard.
2 DESCRIPTION
The MTL 9492-PS-PLUS Power Supply is the recommended method for supplying the MTL 9460-
ET series of intrinsically safe Ethernet modules and is based on an isolating power supply. It takes
a 24V DC safe area / Zone 2 supply and produces an intrinsically safe, 12V DC nominal output
capable of powering any one of the MTL 94xx Series Ethernet modules mounted in a Zone 1
hazardous area. The MTL 9492-PS-PLUS may be mounted in a safe area, Zone 2 hazardous area.
The output can be from either the Ex ia IIB or Ex ib IIB output connectors depending upon
application. The ‘ib’ IIB output providing a higher useable output power where the Gas Group
and Zone allows. See Figures 2.1 and 2.2 for connection details.
MTL 9492-PS-PLUS IS Power Supply

2INM MTL 9492-PS-PLUS Rev 2
Each MTL 9492-PS-PLUS can power a single MTL 946x-ET Ethernet module.
It is not permitted to connect to both ia and ib outputs on the same MTL 9492-PS-PLUS module.
If multiple outputs are required for several Ethernet modules, there is a power distribution
backplane available to simplify the 24VDC input connection to the modules, or alternatively a
number of them can be DIN-rail mounted with a convenient “Powerbus” input.
The MTL 9492-PS-PLUS module has LED power indication for both input and output (see Figure
2.3) along with internal current limiting and electronic auto-reset circuit breaker action to protect
the module in the event of its output being short circuited or overloaded. This also minimises
the power dissipation during the fault to a negligible level, thus improving reliability.
Hazardous area Safe are a
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Figure 2.1
Zone 0
Ex ia IIB
application
Hazardous area Safe are a
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Figure 2.2
Zone 1
Ex ib IIB
application
9492-PS-PLUS 12VDC
POWER SUPPLY
Figure 2.3
MTL 9492-PS-PLUS
top label and
LED indicators
Zone 0
Zone 1
Table 2.1
DIN-rail
mounting
connections
Table 2.2
Backplane
mounting
connnections
Terminal Function
1
2
3
4
5
6
13
14
Ex ia IIB output +ve
n.c.
Ex ia IIB output –ve
n.c.
Ex ib IIB Output +ve
Ex ib IIB Output –ve
Supply –ve (Vs–)
Supply +ve (Vs+)
Terminal Function
1
2
3
4
5
6
7, 8 & 9
10, 11 & 12
Ex ia IIB output +ve
n.c.
Ex ia IIB output –ve
n.c.
Ex ib IIB Output +ve
Ex ib IIB Output –ve
Supply –ve (Vs–)
Supply +ve (Vs+)

3INM MTL 9492-PS-PLUS Rev 2
3 DIN-RAIL INSTALLATION METHOD
This section deals with mounting the individual MTL 9492-PS-PLUS power supplies on DIN rail,
for backplane mounting see Section 4.
WARNING !
If this module is to be connected to intrinsically safe apparatus, it must be installed, operated
and maintained only be trained competent personnel and in accordance with all appropriate
international, national and local standard codes of practice and site regulation and in accordance
with the instructions contained here.
See also Sections 7, 8 and 9 for approvals and important conditions of safe use.
3.1 Protection of equipment
When the power supply is mounted in a safe area ensure that the local environment is clean
and free of dirt and dust and note the ambient temperature considerations given in Section 5.
WARNING !
When mounted in a Zone 2 hazardous area the module must be protected by a suitably
certified enclosure.
3.2 DIN rail mounting
Mount the MTL 9492-PS-PLUS power supplies on low-profile (7mm) or high-profile (15mm)
type T35 (top-hat) DIN-rail to EN50022, BS5584, DIN46277; this is available from MTL, in 1 metre
lengths (THR2 DIN rail). It is recommended that, in normal practice, the DIN rail is earthed to ensure
personnel safety in the event of mains being put accidentally on the rail.
See Figure 3.1 for power supply dimensions.
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Figure 3.1
MTL 9492-PS-PLUS
package
dimensions
& connections

4INM MTL 9492-PS-PLUS Rev 2
3.2.1 Mounting power supplies on DIN rail
Clip power supplies onto type T35 DIN rail as shown in Figure 3.2, with the blue signal plugs facing
towards the hazardous-area wiring. To remove an power supply from the rail, insert a screwdriver
blade into the clip as shown and lever the clip gently outwards; pivot the power suppy off the rail.
Allow a maximum mounting pitch of 16.2mm for each unit.
3.2.2 Wiring up power supplies
Depending on the installation, it may be easier to wire up power supplies with power plugs either
in place or removed. Either way, allow sufficient free cable to permit plugs to be removed easily for
future maintenance and/or replacement purposes.
Power conductors
The removable power plugs are fitted with screw clamp terminals. Note that the conductors should
be between 14 and 24 AWG (1.6 and 0.5mm dia) in size. Plugs, located on top of the modules, are
mechanically keyed to fit in only one position. The input power plug slots into the socket at terminals
13 and 14 on the safe-area side of each module.
Making connections
a) Trim back the insulation of conductors by 12mm.
b) Check the terminal assignments shown in section 6 or on the side label of the unit.
c) Insert conductors according to the terminal assignments and tighten screws.
If the wires are to be fitted with crimp ferrules, 10–12mm is the recommended length of the metal tube.
If longer ones are used, they must be trimmed to 12mm before fitting.
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
 
Figure 3.2
DIN rail mounting
and removal
of module
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Figure 3.2
Removable
power plugs

5INM MTL 9492-PS-PLUS Rev 2
Finishing
Wire up individual power supplies in accordance with wiring schedules. Daisy-chain power supply
connections between individual power plugs or use the power bus (see section 4.1).
Segregate hazardous- and safe-area wiring into separate trunking or looms wherever possible to
avoid errors and maintain a tidy installation.
3.2.3 Ambient temperature considerations
Ambient temperature limits for unenclosed power supplies are from-40°C to +70°C with units close-
packed.
3.3 Power bus - Installation and use
A PB-8T power bus kit enables power supply terminals (13 and 14) of up to 8 installed MTL 9492-PS-
PLUS power supplies to be linked to a standard 24V power supply. The bus consists of a chain of
power plugs and different lengths are available to suit various numbers of modules as follows.
1. Check to make sure the bus length is correct for the number of modules involved.
2. If the number of modules is less than the maximum number the chain will support,
cut off the surplus power plugs at the tail end of the chain - leaving sufficient cable to
attach further power plugs if it becomes necessary later.
3. Insert power plugs into the power terminals on the safe- area side of each module in
sequence.
4. Connect the power supply source to the tail end of the chain (using the insulation
displacement connectors [Scotchloks] provided if required).
Notes:
1. To avoid excessive voltage drop or over-current, DO NOT connect power buses in series.
2. Surplus sections can be used (and, if required) connected together provided the cut
ends are safely terminated and/or connected together. Use single ferrules with a crimp tool
or insulation displacement connectors (Scotchloks). Suitable ferrules and connectors are
provided with the kits.
– +
Optional insulation
displacement
connectors
x2
Figure 3.3
Power bus
wiring, joining
and terminating

6INM MTL 9492-PS-PLUS Rev 2
3.4 Earth rail and tagging accessories
This section explains how to specify and assemble earth rail and tagging strip accessories for the
MTL 9492-PS-PLUS power supplies. The accessories consist of mounting brackets, earth rails,
tagging strips and associated parts. They provide facilities for earthing, terminating cable screens and
tagging (identifying) the positions of individual units.
3.4.1 Parts list
IMB57 Insulating mounting block (Figures 3.4, 3.5 & 3.6)
One required at each end of a tagging strip/earth rail. Suitable for low-profile (7.5mm) and high-
profile (15mm) symmetrical DIN rail.
ERB57S Earth-rail bracket, straight (figure 3.10)
Nickel-plated bus bar; supplied with two push fasteners, one earth-rail clamp (14mm, 35mm
2
) and
one earth cable clamp (10mm, 16mm
2
).
Note: ERB57S is the preferred choice of earth-rail bracket. It is usually fitted in the upper slot
on insulating mounting block IMB57.
Where the earth rail is required to be positioned at a lower height and to allow access to the
IMB57 mounting screws, the straight earth-rail bracket ERB57S can be inserted in the lower
slot, but only after insulating mounting blocks IMB57 are clamped to the DIN rail.This may not
be possible if, for example, trunking is fitted. In this case, fit offset earth-rail bracket ERB570
(see figure 3.4 & 3.10) in the upper slot: the mounting blocks can then be fitted in a restricted
space with this bracket already fitted.
ERB570 Earth-rail bracket, offset (figure 3.10)
Nickel-plated bus bar ; supplied with two push fasteners, one earth-rail clamp (14mm, 35mm2)
and one earth cable clamp (10mm, 16mm2).
ERL7 Earth rail, 1m length (figure 3.10)
Nickel-plated bus bar; may be cut to length.
TAG57 Tagging strip, 1m length (figure 3.10)
Cut to size. Supplied with tagging strip label.
TGL57 Tagging strip labels, set of 10 x 0.5m
Spares replacement, for use with TAG57 tagging strip.
MS010 DIN rail module spacer, 10mm, pack of 5 (figure 3.8)
Grey spacer; one required between each MTL 9492-PS-PLUS and any adjacent module on a DIN rail,
to provide 10mm air-circulation space between modules.
ETM7 Earth terminal, bag of 50 (figure 3.9)
For terminating cable screens and 0V returns on the ERL7 earth rail. For cables ≤ 4mm2.
TH5000 Tag holder
Spares replacement.
Connectors
Spares replacement: HAZ1-3, HAZ4-6, HAZ-CJC, PWR5000, SAF7-9, SAF10-12 (SAF1-3 and SAF4-6
grey connectors, also available for use in safe-area applications).