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Nidec Industrial Solutions
XRB Isolator E nclosure Application Note:
While the XRB3 isolators are commonly located inside drive or PLC cabinets, Nidec
Industrial Solutions has received customer requests to advise them if the XRB3 can be
located elsewhere, in a smaller and/or field-mounted enclosure.
The XRB3 must always be located inside an equipment enclosure. The installation must
meet the following requirements:
1.
The enclosure must provide appropriate mechanical strength and ingress
protection:
a.
IP20 for indoor locations
b.
IP54 for outdoor locations or indoor wet locations.
2.
If located in a hazardous area or zone, the enclosure and interconnections must
meet all certification requirements for the hazardous area or zone including
wiring connections, glands, conduit, etc.
3.
The enclosure design must ensure the ambient temperature inside the enclosure
must not exceed 80°C even under isolator ‘fault conditions’:
a.
This includes enclosure internal temperature rise from 12W of potential
heating contribution / dissipation from the XRB isolator.
i.
This maximum heating contribution of 12 Watts from the isolator
‘fault condition’ occurs when 24 volts power is applied to the
isolator and a short circuit load is applied on the isolator power
output to the encoder.
ii.
The designer may not rely on external power supply limits or fusing to
the XRB to avoid this fault condition as actual current draw (but not
thermal heating) during normal operation can exceed the ‘fault
condition’.
b.
This includes internal temperature rise from any other equipment in the
enclosure.
c.
This includes the maximum expected ambient external air temperature for the
enclosure which includes any external sources of enclosure heating (motor,
sunshine, etc.)
4.
All instructions from both the XRB isolator and XR encoder manuals for the
specific hazardous location must be followed.
5.
All instructions from both the XRB isolator and XR encoder installation
drawing for the specific hazardous location must be followed.
REV 10-28-2020