Mechanical Design
‑41‑
Note: The maximum air volume Qmax of the fan is the maximum value of the
intersection of the P‑Q curves of the fan at the abscissa, as shown in the following
figure.
The preceding tables apply to only a single unit. When multiple units are installed in
the cabinet, the total air volume of the cabinet is the sum of all the above‑mentioned
air volume.
For example, if a cabinet contains:
Power supply unit (15 kW) + Single‑axis drive unit (7.5 kW) + Dual‑axis drive unit (2.2
kW) + Dual‑axis drive unit (0.75 kW),
the required minimum air volume is 60 + 26 + 18 + 8 = 112 CFM.
Cabinet Fan Selection
Cabinet fan selection procedure:
1. Calculate the sum of cooling air flows required for all modules according to "
Table
2–5
"
on page 40
and "
Table 2–6
"
on page 40
.
2. Determine the maximum air volume (Qmax) of the cabinet fan.
3. Determine the fan specifications and quantity according to the maximum air
volume (Qmax).
Note that:
Maximum air volume of the cabinet = (1.3 to 1.5 times) the sum of cooling air
volume
Maximum air volume of the cabinet = (1.6 to 2.2 times) the sum of cooling air
volume (if the components such as dry nets and shutters are installed at the
cabinet air outlet)
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