6.
ENTITY PARAMETERS (RATINGS)
The following ratings apply for the ARL-BR-IS Safety Barrier.
ARL-BR-IS-PWR Entity/NIFW Output Parameters: Uo = 4.935V, Io = 1.7A, Po = 760mW, Co = 100uF, Lo = 12.3uH
ARL-BR-IS-LC Entity/NIFW Output Parameters: Uo = 5.715V, Io = 72mA, Po = 80mW, Co = 46uF, Lo = 6.8mH
ARL-BR-IS-RS Entity/NIFW Output Parameters: Uo = 5.715V, Io = 36mA, Po = 40mW, Co = 46uF, Lo = 27.4mH
ARL-BR-IS-PWR-RS Entity/NIFW Output Parameters: Uo = 6.135V, Io = 1.736A, Po = 850mW, Co = 34uF, Lo = 11.7uH
ARL-BR-IS-PWR-LC Entity/NIFW Output Parameters: Ut = 6.135V, It = 1.772A, Po = 850mW, Co = 34uF, Lo = 11.3uH
7.
MAINTENANCE
7.1.
General Considerations
Provided they are correctly installed and connected (as described in Sections 5 and 6 in this manual), and that the system they are
protecting are not themselves defective, barrier faults are highly unlikely to occur. Therefore, servicing of barrier installations
consists mainly of routine inspection and earth testing as described in this section.
More information about the maintenance of barrier installations is given in the Standards Document BS EN 60079-17.
7.2.
Routine Inspection
At intervals not exceeding two years (more frequently for harsh environments), make a visual check of the barrier installation.
Personnel undertaking these checks should comply with all regulations relating to the safety of plant and personnel. Care must be
taken to prevent any inadvertent direct connection between hazardous- and safe area circuits and, at all times, the safety
precautions discussed in section 5 MUST be observed.
Check that:
a)
Barriers are of the types and polarities specified in the safety documentation.
b)
The barriers are attached securely and correctly Earth Ground to make sure that the earth connection is safe. If the barrier
came with the optional DIN rail mount, make sure that the barriers are mounted correctly according to that specification.
c)
There are no apparent signs of damage or corrosion to the barriers, the plant earth connections, and if fitted, any earth rail
assemblies.
d)
All hazardous area and safe area cable connections are made correctly and the terminals properly tightened.
e)
Interconnecting cables are of the type and rating specified by the safety documentation and that they are not frayed or
otherwise damaged.
f)
All earth returns and cable screens from the hazardous area are connected to earth through the barrier, a dummy barrier or
earth rail.
g)
Visually examine the earth conductors and make sure they are not damaged in any way that their terminations are secure
and free from corrosion.
h)
Using a low-voltage low-current test meter (i.e. a meter with an output not exceeding 3V and 50mA), measure the
resistance of the earth ground and the neutral star-
point of the supply to make sure it doesn’t exceed 1Ω
. Record the
