J. T. Eaton LCX9000 User Manual download pdf (Page 31)

LCX9000 Liquid-Cooled Drives User Manual

MN04005001E

For more information visit: www.EatonElectrical.com 2-9

January 2007

Table 2-5: Drinking Water Quality Recommendations — Desired Values

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No aggressive water allowed.

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To be approved by user and no unusual changes.

The cleanness of the heat exchanger, and therefore the heat exchanging capacity, depend on

the purity of the process water. The more impure the water, the more frequently the heat

exchanger needs cleaning. The values in Table 2-6 are reference values required of cooling

circuit process water.

Table 2-6: Process Water Speciﬁcation

The design temperature of the cooling agent entering the drive module(s) is 95°F (35°C).

While circulating inside the cooling element, the liquid transfers the heat produced by the

power semiconductors (and the capacitors). The design temperature rise of the cooling agent

during the circulation is less than 9°F (5°C). Typically, 95% of the power losses is dissipated in

the liquid. Eaton recommends equipping the cooling agent circulation with temperature

supervision.

The heat exchanging equipment can be located outside the electrical room in which the

drives are located. The connections are made on site. In order to minimize the pressure

drops, the pipings should be made as straight as possible. We further recommend mounting

a regulating valve equipped with a measurement point. This makes the measurement and

regulation of liquid circulation possible in the start-up phase.

In order to prevent dirt particles from accumulating in the connections and gradually

weakening the cooling effect, installation of ﬁlters is also recommended.

The highest point of the piping must be equipped with either an automatic or a manual

venting device. The material of the piping must comply with at least AISI 304 (AISI 316 is

recommended).

Prior to the actual connection of the pipes, the bores must be cleaned thoroughly. If cleaning

with water is not possible, pressured air must be used to remove all loose particles and dust.

Quality Unit Desired Value

Clostridium perfringens (including spores) pmy/100 ml 0

Coliform bacteria pmy/100 ml 0

Bacterial count [22°C] — No unusual changes

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pH 6 – 8

Electrical conductivity

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µS/cm <100

Turbidity —

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Color — No unusual changes

Smell and taste — No unusual changes

Total organic carbon (TOC) — No unusual changes

Tritium beg/L 100

Indicative total dose mSv/year 0.10

Water hardness °dH 3 – 10

Max. particle size in coolant µm 300

Quality Unit Value

pH pH 6 – 9

Water Hardness °dH <20

Electrical Conductivity µS/cm <100

Chlorides (Cl) mg/L <100

Iron (Fe) mg/L <.5

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J. T. Eaton LCX9000 User Manual Page 31

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