J. T. Eaton LCX9000 user manual 5 Drinking Water Quality Recommendations - Desired Values

LCX9000 Liquid-Cooled Drives User Manual

January 2007

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

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	pH	6 – 8
Electrical conductivity	µS/cm	<100
Turbidity	—
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

No aggressive water allowed.

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 2-6are reference values required of cooling circuit process water.

Table 2-6: Process Water Specification

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

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.

MN04005001E For more information visit: www.EatonElectrical.com 2-9