Flexible Automation
Subracks
2-12
1070 072 143-101
2.6 Fan unit
To avoid heat accumulation and therefore the failure or destruction of mod
ules, fan units are installed in the subracks. Three fan units are available:
D Fan unit with 3 fans for the basic unit with 14 slots.
D Fan unit with 2 fans for basic or expansion units with 14 slots.
D Fan unit K with 1 fan for basic or expansion units with 8 slots.
. A clearance of at least 90 mm beneath the subrack is necessary for the
assembly and replacement of a fan unit.
. For each module, the special information in the respective module de
scription regarding operating conditions and installation of a fan unit
must be observed.
Basic unit
Basic units may be operated without a fan unit under the following condi
tions:
D Ambient temperature in switch cabinet V45 ºC,
D Power supply module NT1 or NT24,
D No system modules and
D No peripheral modules requiring a fan unit.
The basic unit must be equipped with a fan unit if one of these conditions is
not fulfilled.
Basic units may be operated with fan units with two fans under the following
conditions:
D Ambient temperature in switch cabinet V55 ºC,
D Power supply module NT1, NT2 or NT24,
D No system module at slots 7, 8, 9, 13 and 14.
The fan unit with three fans must be used at the maximum capacity of the
basic unit.
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