MD600 Series Compact AC Drive Hardware Guide-EN-B06.PDF - 第44页
Electrical Design ‑43‑ The preceding tables apply to only an individual product. When multiple products are installed in the cabinet, calculate the total air volume by adding the air volume of each product. For example, …
Electrical Design
‑42‑
The preceding tables apply to only an individual product. When multiple drives are
installed in the cabinet, the total ventilation area is the sum of all the above-mentioned
ventilation areas. If the air outlet is installed with a filter screen, the air outlet resistance
increases substantially. In this case, the minimum effective area of the air outlet is
1.2...1.5 x values listed in the preceding table. The ventilation area in the preceding
tables refers to the actual through-hole area of the opening. The ventilation area is
calculated by the following: opening area x opening rate.
For example, a cabinet contains the following products:
T1 model (single-phase 0.37 kW) + T1 model (single-phase 1.5 kW) + T2 model (single-
phase 2.2 kW) + T1 model (three-phase 0.75 kW) + T1 model (three-phase 2.2 kW) + T2
model (three-phase 4 kW). Therefore, the minimum ventilation area of the cabinet air
outlet should be 32.8 + 26 + 35.5 + 32.8 + 26 + +35.5 = 188.6 cm
2
. In active air ventilation
mode, a fan is installed at the top of the cabinet to draw hot air out of the cabinet. This is
a commonly used ventilation mode. To ensure that the hot air can be exhausted to the
outside, the total air volume of the fan cannot be smaller than that of all drives in the
cabinet.
The following table lists the cooling air volume required by the AC drive.
Table 4–12 Cooling air volume (single-phase 200 V to 240 V)
Structure
Power (kW) Quantity
Max. Air Volume Qmax (CFM)
of the Fan at the Top of the
Cabinet
T1
0.37 1 0
0.75 1 22
1.5 1 22
T2 2.2 1 38
Table 4–13 Cooling air volume (three-phase 380 V to 480 V)
Structure
Power (kW) Quantity
Max. Air Volume Qmax (CFM)
of the Fan at the Top of the
Cabinet
T1
0.37 1 0
0.75 1 0
1.5 1 22
2.2 1 22
T2
4 1 38
5.5 1 38
The maximum air volume Qmax is the maximum value of the point where the fan P-Q
curve meets the abscissa, as shown in the following figure.
Electrical Design
‑43‑
The preceding tables apply to only an individual product. When multiple products are
installed in the cabinet, calculate the total air volume by adding the air volume of each
product.
For example, a cabinet contains the following units: T1 model (single-phase 0.37 kW) +
T1 model (single-phase 1.5 kW) + T2 model (single-phase 2.2 kW) + T1 model (three-
phase 0.75 kW) + T1 model (three-phase 2.2 kW) + T2 model (three-phase 4 kW).
Therefore, the minimum ventilation value of the cabinet fan should be 0 + 22 + 38 + 0 + 22
+ 38 = 120 CFM.
4.5.2.2 Fan Design
The MD600 fan is designed with a separate fan duct and supports forward and reverse
rotation of the fan.
To select the fan, do the following:
1. Calculate the sum of cooling air volume required by all the devices based on "
Table 4–
13
"
on page 42
and "
Table 4–12
"
on page 42
.
2. Determine the maximum air volume value (Qmax).
3. Determine the specification and quantity of the fan based on the maximum air volume
(Qmax).
Where:
Qmax = (1.3 to 1.5) × Sum of cooling air volume
Qmax = (1.6 to 2.2) × Sum of cooling air volume (if a mesh filter or other components
are installed at the cabinet air outlet)
Electrical Design
‑44‑
Note
● The air volume of the selected fan cannot be smaller than the maximum air
volume Qmax. If a single fan cannot meet this requirement, multiple fans can be
used.
● Install the fan in the correct air exhaust direction to ensure that air flows from
inside to outside of the cabinet. Otherwise, hot air cannot be exhausted and the
drive may be overheated or damaged.
4.5.3 EMC-Compliant Cabinet Design
To prevent electromagnetic interference in the cabinet, isolate interference sources from
devices that may be interfered during installation. Divide a cabinet into multiple EMC
compartments or use multiple cabinets based on the intensity of interference sources,
and install each device in accordance with the following wiring principles.
Table 4–14 Wiring Principle
No.
Wiring Principle
1
Install the control devices and the drive devices in two different
cabinets.
2
If multiple cabinets are used, use grounding cables with a cross-
sectional area of at least 16 mm2 to connect different cabinets,
therefore realizing equipotential bonding between the cabinets.
3
Place the devices in different areas in the cabinet according to the
device signal strength.
4
Carry out equipotential bonding for the devices in different areas of
the cabinet.
5
Shield all communication (such as RS-485) signal cables leading from
the cabinet.
6
Install the power supply input filter close to the cabinet input
interface.
7
Spray each grounding point in the cabinet.