Installation; Mechanical Installation - Grundfos CUE Series Product Manual

Installation

Mechanical installation

The CUE cabinet sizes are characterised by their
enclosure. The CUE is available in three enclosure
classes: IP21, IP54 and IP55. To see the relationship of
enclosure class and enclosure type, see tables starting
on page 41.
The general installation requirements necessitate spe-
cial considerations as to these aspects:
• Enclosure class IP54/55 must be installed freely ac-
cessible, but must not be installed outdoors without
additional protection against water and the sun.
• The CUE contains a large number of mechanical
and electronic components and must therefore not
be installed in an environment where the air con-
tains liquids, particles or gasses which may affect
and damage the electronic components.
• In applications requiring Ex approval, the CUE
should be installed outside the hazardous area.
Space requirements and air circulation
CUE units can be mounted side by side, but as a suffi-
cient air circulation is required for cooling, these
requirements must be met:
• Sufficient free space above and below the CUE.
See table below.
• Hang the CUE directly on the wall, or fit it with a
back plate to secure sufficient air flow for cooling.
See fig. 36.
Fig. 36 CUE hung directly on the wall or fitted with a back
plate
Required free space above and below the CUE
Enclosure
A2, A3, A5
B1, B2, B3, B4, C1, C3
C2, C4, D1, D2
Outlet
temperature
Inlet
temperature
Space - in [mm]
4 (100)
8 (200)
9 (225)
Required free space in front of the CUE
Furthermore, there must be sufficient space in front of
the CUE for opening the door of the CUE. See fig. 37.
21.0 in.
Fig. 37 Free space in front of CUE enclosures D1 and D2
Ventilation of built-in CUE
The CUE can be mounted in a control cabinet if suffi-
cient air circulation is ensured. The quantity of air flow
required for cooling the CUE can be calculated as fol-
lows:
×
P 3.285
q = ------------------------------- -
v ΔT
Insert P in Watt and ΔT in F (Fahrenheit.
P is the power loss of all equipment integrated in the
same cabinet. Calculate the power loss P of the CUE by
means of the typical shaft power P2 multiplied by the
efficiency.
ΔT is the difference between the outlet temperature and
the inlet temperature (ambient) of the cooling air. See
fig. 36.
Note: The inlet and outlet temperatures must not be
higher than the values in the table below.
Output current
Up to 177 amps 122 °F (50 °C)
113°F (45 °C)
Over 177 amps
The average inlet temperature over 24 hours must be
9 °F lower.
Grundfos CUE
3
[ ]
ft / min
Max. inlet Max. outlet
temperature temperature
131 °F (55 °C)
122 °F (50 °C)
31