Baldor MicroFlex, Installation Manual

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Basic Installation 3-5 MN1919
3.2.2 Mounting and cooling the MicroFlex
Ensure you have read and understood the
Mechanical installation and location requirements
in
section 3.2. Mount the MicroFlex vertically on its rear side, the side opposite the front panel.
M5 bolts or screws should be used to mount the MicroFlex. Detailed dimensions are shown in
section 3.2.1.
For effective cooling, the MicroFlex must be mounted upright on a smooth vertical metal
surface. The MicroFlex is designed to operate in an ambient temperature of 0°C to 45°C (32°F
to 113°F). Output current must be derated between 45°C (113°F) and the absolute maximum
ambient temperature of 55°C (131°F). Within the ambient temperature range:
The 1A and 3A models are designed to operate without any additional cooling methods.
The 6A and 9A models require a forced air flow, passing vertically from the bottom to the top of
the MicroFlex case, to allow full rated current at 45°C (113°F).
Temperature derating characteristics are shown in sections 3.2.4 to 3.2.6.
Note: Failure to meet cooling air flow requirements will result in reduced product lifetime
and/or drive overtemperature trips. It is recommended to check periodically the
operation of the cooling equipment. Optional fan tray FAN001-024, mounted
exactly as shown in section A.1.1., ensures that correct cooling is provided and
allows the MicroFlex to be UL listed.
3.2.2.1 Effects of mounting surface and proximity
The proximity of the MicroFlex to other
components could affect cooling efficiency. If
the MicroFlex is mounted beside another
MicroFlex (or other obstruction), there should
be a minimum space of 15mm to maintain
effective cooling.
If the MicroFlex is mounted above or below
another MicroFlex (or other obstruction), there
should be a minimum space of 90mm to
maintain effective cooling. Remember that
when a MicroFlex is mounted above another
MicroFlex or heat source, it will be receiving air
that has been already heated by the device(s)
below it. Multiple MicroFlex units mounted
above each other should be aligned, not offset,
to promote air flow across the heatsinks.
The derating characteristics assume the
MicroFlex is mounted on 3mm thick (or less)
metal plate. If the MicroFlex is mounted on
10mm plate then the current characteristics
shown in sections 3.2.4 to 3.2.6 may be
increased by up to 7% if there is no forced air
cooling, or 15% if forced air cooling is present.
It is recommended to allow approximately
60mm at the front to accommodate wiring and
connectors.
F
or
ced
ai
r
flow
Fan Fan
15mm
15mm
90mm
Figure 2 - Cooling and proximity
Metal backplane
C
ool
W
ar
m
H
ot