8 - 4 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
Rack safety requirements
INSTALLATION
8.3 Rack safety requirements
8.3.1 Adequate ventilation
VM600 19" racks do not contain any ventilation units (fans). They therefore rely on either
forced ventilation by fans in the cabinet or on natural ventilation (convection) for their cooling.
All require the free flow of air in an upward direction, with air entering the rack through the
vents in the base of the rack and leaving it through the vents on the top of the rack.
When racks are installed in a cabinet or enclosure, in which natural ventilation is used, a
space of at least 50 mm should be present below and above each rack for an ABE04x rack
(see Figure 8-1, Case A) and 20 mm for an ABE056 rack (see Figure 8-2, Case A).
It is possible to prevent warm air flowing from one rack to another, by placing inclined plates
between them in order to deflect the airflow (see Figure 8-1, Case B for an ABE04x rack and
Figure 8-2, Case B for an ABE056 rack). When inclined plates are used with VM600 racks,
an inclined plate can also function as a non-flammable separation barrier, if required
(see 8.3.4 Instructions for locating and mounting). In addition, the space of 50 mm or 20 mm
should be present below and above ABE04x or ABE056 racks respectively.
If an ABE04x rack is assembled without empty slots between the MPS and/or CMS
processing cards, it is recommended to use forced ventilation if the temperature of the air
flowing through the rack exceeds 40°C. If a 19” x 6U rack has at least one empty slot between
each processing card, it is recommended to use forced ventilation if the temperature of the
air flowing through the rack exceeds 55°C.
In a case where forced ventilation by fan units is used, the spacing above, below and between
racks can be reduced to zero, providing that the airflow to/from neighbouring racks is
ensured.
Always ensure adequate spacing (minimum 50 mm or 20 mm for ABE04x or
ABE056 racks respectively) is provided below and above the rack to allow
proper natural ventilation.
Failure to adhere to this requirement will cause overheating of the rack and
as a consequence will affect the correct operation of the system.
HAZARDOUS TEMPERATURES CAN EXIST WITHIN AND ON VM600 SYSTEM
RACKS
(ABE04X).
D
EPENDING ON THE AMBIENT OPERATING TEMPERATURE, NUMBER OF CARDS AND
POWER
SUPPLIES INSTALLED (AND THEIR CONFIGURATION AND OPERATION), THE
INSTALLATION
AND COOLING (FORCED OR NATURAL VENTILATION), THE TOP OF A
VM600 RACK CAN BECOME HOT AND THERE IS THE RISK OF BURNING WHEN HANDLING
THE
RACK.
S
EE ALSO HOT SURFACES AND THE RISK OF BURNING ON PAGE XV.
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