Mtl4500 Range Description; Standard Backplanes; Customised Backplanes; Accessories - Eaton Crouse-Hinds Series Instruction Manual

INM 4500/4600 Rev 12
DRAFT - 22 March 2018
2

MTL4500 RANGE DESCRIPTION

Each module has a multi-pin connector in its base that plugs into a matching connector on
the backplane. This connector carries all appropriate safe-area circuits and power supplies.
Additional multiway connectors, located at the front of the module, accept the wiring from
the hazardous-area circuits. All connectors are keyed so that connections cannot be made
the 'wrong way round'.
Status LEDs and configuration ports (where appropriate) are located on the front of the
modules for easy access, and full dc isolation is provided between the input and output so
that the modules are intrinsically safe without needing an earth.
2 .1

Standard backplanes

MTL4500 range of standard backplanes, with quick-release clip connectors, accommodate
4, 8, 16 or 24 modules. The backplane carries the safe-area signals and distributes dual-
redundant 24V dc power supplies with three-point status monitoring. In applications
where a number of 8- and 16-way backplanes are installed, the power supplies can be
interconnected. Optional earth-rail kits are available for 8- and 16-way backplanes and
tagging-strip kits are available for all backplanes.
2 .2

Customised backplanes

If the backplane is to be mounted in a safe area (which is the most common type of
application) then it does not need to be certified, because the hazardous area wiring
connects to the I/O modules, not the backplane. This means that non-hazardous area
backplanes can be produced easily by Eaton, or the user, and can be designed to match
exactly the size, shape, method of mounting, type of connector, pin assignments, etc, of a
particular process system. Please contact Eaton's MTL product line for further information.
When mounting the backplane in Zone 2/Div 2 hazardous areas refer to our website for
documents detailing any approvals.
2 .3

Accessories

Accessories are available that enable the user to mount standard MTL backplanes. These
include surface-mounting kits, T-section and G-section DIN-rail mounting kits and end stops
and a horizontal plate for mounting 24-way backplanes in 19-inch racks.
3 INSTALLATION – PRECAUTIONS
3 .1

General

Read this section before beginning to install backplanes, enclosures, modules etc.
3 .2

Precautions

a) Make sure that all installation work is carried out in accordance with all relevant local
standards, codes of practice and site regulations.
b) When planning the installation of MTL4500 range it is essential to make sure that I .S .
and non-I .S . wiring is segregated, as required by a nationally accepted authority or as
described in EN 60079-14 or ISA RP 12.6.
c) Check that the hazardous-area equipment complies with the descriptive system
document.
d) If in doubt, refer to the certificate/catalogue for clarification of any aspects of intrinsic
safety, or contact Eaton's MTL product line or your local representative for assistance.
e) Check that the interface unit(s) function(s) are correct for the application(s).
f) When plugging modules into backplanes and hazardous-area connectors into
modules, check the identification labels to make sure the items match correctly.
g) External power supply shall contain double isolation from hazardous voltages or that
unit shall be supplied by Limited Power Circuit per UL/IEC 60950 or Limited Energy
Circuit per UL/IEC 61010 or Class ll Power Supply per NEC.
h) Environmental conditions: indoor use, altitude (up to 2000m) and humidity less than
95% non condensing.
3