Ventilation; Preliminaries - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_01-2010
005704-M-5001 A03249
CHAPTER 4 - INSTAllATION INSTRUCTIONS
analysis should be performed to confirm the exact requirement.
The 8-Way AC to DC Power Supply Units can provide a 50W dc supply
or a 100W dc supply depending upon whether one or two switch mode
modules are incorporated in the power supply unit.
Similarly, the 16-Way AC to DC Power Supply Units can provide a
50W, 100W, 150W and 200W dc supplies depending upon whether
one, two, three or four switch mode modules are incorporated in the
power supply unit.
6.

VENTIlATION

The 5704 Control System provides the facility for a large number of
channels in a very small space. In heavily populated racks, especially
those with many catalytic input control cards or relays configured for
normally energised operation, it is possible for the heat dissipation to
cause a significant rise in temperature both within the rack and in an
area close to the rack.
As such, careful consideration must be given to thermal planning. To
achieve most from the convection cooling, always ensure that the air
can flow freely through the rack and power supply. Do not obstruct the
air vent holes in the top and bottom of the rack and if possible space
the control cards evenly within the rack.
It is recommended that during commissioning the operating temperature
of the rack is checked to ensure that the maximum operating temperature
of 55 C is not exceeded. In some cases the addition of forced air
o
ventilation may be required.
Maximum power supply configuration allowed without provision for
additional ventilation is 100w for 8 way cabinet and 200w for 16 way
cabinet.
7.

PRElIMINARIES

Ensure that each control card is compatible with the proposed sensor/
transmitter to be connected to that control card.
Ensure that where an AC to DC Power Supply Unit is to be used, this
is compatible with the local mains ac supply voltage and that the PSU
power rating is adequate for its individual system load.
Note: The model 05701-A-0405 and 05701-A-0406 AC to DC Power
Supply Units operate, without the requirement of input voltage
adjustments, from an 85V to 264V, 47Hz to 440Hz ac supply
inputs.
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5704 Control System