J. T. Eaton Liquid-Cooled Drives LCX9000 - Manual (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
ᕃ No aggressive water allowed.
ᕄ 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
pH ᕃ pH 6 – 8
Electrical conductivity ᕃ µS/cm <100
Turbidity — ᕄ
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