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Sonix Hmi-Tu Technical Manual
SONIX HMI-TU TECHNICAL MANUAL
TM377 / A June 2022 www.eaton.com
8 Appendix A – Hmi-Br - Safety
Interface Board
A.1. Introduction
The Hmi-Br is a safety interface intended to be installed
in the non-hazardous area to provide an intrinsically safe,
Zener clamped, resistively limited output to the Eaton
MEDC Hmi-5 access panel which is installed within the
hazardous area.
A.2. Installation
The Hmi-Br safety interface comprises a single PCB
mounted to a DIN rail non-metallic holder. The PCB is
fully encapsulated within the holder to form a tamper
proof unit. Two user terminals are provided at either end
of the unit to allow for connection of intrinsically safe
(marked Hazardous) and non-intrinsically safe (marked
Non-Hazardous) wiring. In addition to these terminals
the unit is also provided with a threaded metallic earth
stud to allow for the connection of the I.S. safety
earthing.
The Hmi-Br safety interface board should be mounted
in the non-hazardous area, within an enclosure which
provides suitable ingress protection and a minimum
protection of IP20.
The product must not be installed in an environment
where it may be attacked by aggressive substances.
Cable termination should be performed by suitably
trained personnel in accordance with IEC EN 60079-14.
The non-intrinsically safe terminals are rated for a Um of
250V
The HMI-BR is a four-channel device that provides the
following entity parameters per connection point. All
connection points are with respect to the local I.S. Earth.
Aud1
Aud2
Dat1
Dat2
Uo
26.1 V
26.1 V
7.9 V
7.9 V
Io
137.4 mA
137.4 mA
36.3 mA
36.3 mA
Po
897 mW
897 mW
72 mW
72 mW
Ci
0µF
0µF
0µF
0µF
Li
0µH
0µH
0µH
0µH
ote:
N
Aud1 / Aud2 have a minimum series resistance of 190Ω and
Dat1 / Dat2 have a minimum series resistance of 217Ω.
A.3. Maintenance
This equipment should require little or no maintenance
during its working life. However, if abnormal or unusual
environmental conditions occur due to mechanical
damage or accidents then visual inspection is
recommended
The Hmi-Br contains no user replaceable parts and shall
not be repaired by the user. Contact Eaton MEDC Ltd for
replacement if required.
A.4. Certification
ATEX
ATEX certificate number: ITS 13ATEX27896X
Certified to EN 60079-0, EN60079-11, EN60079-26
II (1) G [Ex ia Ga] IIC
T
amb
: -40ºC to +60ºC
IECEx
IECEx certificate Number: IECEx ITS 13.0047X
Certified to IEC 60079-0, IEC 60079-11, IEC 60079-26
[Ex ia Ga] IIC
-40°C ≤ Ta ≤ 60°C
Special Conditions For Safe Use
•
The apparatus is only permitted to be used with
products manufactured by Eaton MEDC Ltd, or its
derivative companies. In addition to this, the suitability
of apparatus to interact with any external equipment
shall be evaluated and stated explicitly on the
equipment certification.
•
The apparatus must be installed within an enclosure
providing a suitable degree of protection as to prevent
ingress of conductive materials with a minimum rating
of IP20.
•
The ambient local to the apparatus in its final
installation shall not exceed the specified ambient
temperature range -40ºC ≤ Ta ≤ +60ºC.
•
Isolation between the intrinsically safe interface
and the external enclosure is to be verified upon
installation by the application of a dielectric strength
test. The test shall be conducted as follows:
•
A 500 V dielectric strength test is to be
conducted upon assembly between all
intrinsically safe circuits and the external
enclosure. Test duration is to be a minimum of
1 minute with an applied voltage of 500 V AC
rms at a frequency of 48 – 60 Hz or alternatively
a voltage of 700 V DC may be applied. Leakage
current is not to exceed 5 mA.
