The following safety requirements must be considered
when the enclosure is mounted in a rack:
The rack construction
must support the total weight of the installed enclosures.
The design should incorporate stabilizing features to prevent
the rack from tipping or being pushed over during installation or
in normal use.
When loading a rack with
enclosures, fill the rack from the bottom up; and empty the rack from
the top down.
Always remove all power
supply modules to minimize weight, before loading the enclosure into
the rack.
Do not try to lift the
enclosure by yourself.
CAUTION To prevent of the rack falling over, never move more than one enclosure out of the cabinet
at any one time.
The system must be operated
with low-pressure rear exhaust installation. The back pressure that is created
by rack doors and obstacles must not exceed 5 pascals (0.5 mm water
gauge).
The rack design should
take into consideration the maximum operating ambient temperature
for the enclosure. The maximum operating temperature is 35ºC (95ºF) for controllers and 40ºC (104ºF)
for expansion enclosures.
The rack should have
a safe electrical distribution system. It must provide overcurrent
protection for the enclosure. Make sure that the rack is not overloaded by the total
number of enclosures that are installed in the rack. Consideration should be given to the electrical power consumption
rating shown on the nameplate.
The electrical distribution
system must provide a reliable connection for each enclosure in the
rack.
Each PSU or PCM in each
enclosure has a grounding leakage current of 1.0 mA. The design of
the electrical distribution system must take into consideration the
total grounding leakage current from all the PSUs/PCMs in all the
enclosures. The rack requires labeling with “High Leakage Current.
Grounding connection essential before connecting supply.”
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