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Chapter 3 Mechanical and Electrical Installation
environment inside the AC drive room. The cooling water is completely separated from the
circulating air and the water pipeline is clearly separated from the high voltage equipment outside
the AC drive room, ensuring that the high voltage equipment room is not subject to safety threats
and accidents such as waterproofing and insulation damage. At the same time, because the room is
airtight, the AC drive uses the circulating air in the room for equipment cooling, which has the
characteristics of low dust level and low maintenance, reducing the adverse impact of the
environment on the operational stability of the AC drive power unit cabinet and control cabinet.
b) Air - water cooled conditions
In order to facilitate site selection and application, the following conditions usually need to be
met on site:
● The industrial cooling water temperature that can be provided on site is ≤ 33°C and the inlet water
pressure that can be provided is between 0.25 MPa and 0.55 MPa, with a return water pressure drop
of ≤ 0.1 MPa.
● Able to provide the necessary cooling water, the AC drive air-water cooling system requires a
circulating cooling water volume of: heating power (kW): cooling water flow (m³ /h) = 4:1 (single
set of air-water cooling system).
● The AC drive needs to be equipped with a separate, airtight house with more than 10 cm of
insulation or thermal insulation.
● The house has a clear height of not less than 3.5m and a construction and installation site of not
less than 2.0m in width in front or behind the length of the house.
● The site is able to provide two 380VAC/3PH power supplies with a 6kW power requirement
capacity for the AC drive room.
● The cooling water quality requires no suspended matter deposits and a pH value of ≥7.2 on the
alkaline side. The cooling water quality requires no suspended matter deposits and a pH value of
≥7.2 on the alkaline side.
c) Selection and configuration principles
For a 4000kW load, for example:
The maximum cooling power of the AC drive is 4,000 x 4% = 160 kW, calculated on the basis
of a rated power of 4,000 kW and an operating efficiency of 96%. The air circulation efficiency is
close to 99%. Considering the heat generation under the extreme operation condition, as well as the
high-water temperature and the system exchange efficiency, the design margin of the air-water
cooling device is usually chosen to be 1.15 times to 1.2 times. That is: the heat exchange power of
the AC drive air-water cooling device is not less than 184kW/set, and the actual cooling power
chosen is 190kW~200kW air-water cooling device.
ACH200 Series High Voltage Variable Frequency Speed Control System Operating Manual
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