Characteristic Data Of Water-Cooled Units, Type K - Siemens simovert masterdrives Betriebsanleitung

Technical Data
11.1.7

Characteristic data of water-cooled units, type K

Background
NOTE
11-20
♦ If an application with degree of protection IP54 is set up, it is
necessary to close the gaps between the chassis side walls and the
cubicle walls.
♦ In cubicle systems, partition walls up to the top cover plate are to be
fitted between the units.
♦ If the units are operated with degree of protection IP54, the air
temperature inside the units during rated operation is distinctly
higher than the water supply temperature.
♦ One-inch internal threads are provided for the water connection.
The connection nipples must be of stainless steel or heavy gauge
aluminium. Ideally, flat seals should be used.
♦ If the connectors supplied with the units are used, they should be
sealed with Loctite 542.
♦ The "Goldschlange" (gold snake) hose made by Paguag is
recommended.
♦ For the joint, use is made of an NW25 screw-type sleeve for
"Goldschlange" hose with inside piece of V2A and a double nipple of
V2A.
♦ Cooling water supply (blue) and return (red) are to be connected in
accordance with the colour coding, which is to be found next to the
1-inch water connection beneath the heat sink.
The tables listed below give the rated water flow volume in l/min and
the pressure difference (in Pa) across the heat sink at rated flow
volume.
The water-cooled units have a lower power loss (i.e. a higher efficiency)
than the air-cooled units. The power loss is given in Table 11-8.
MASTERDRIVES with water-cooling have the same power rating as
the air-cooled units. Since the thermal resistance of the heat sinks for
the IGBT is distinctly better than that attainable with air-cooling, the
modules are operated with a junction temperature that is 20 K lower.
The result of this is that the module losses are about 5 % lower.
This effect also gives the modules a good life expectancy.
Many units are also equipped with small built-in fans. The lower power
losses of these can also be taken into account.
In the tables below, the data for new units or more exact data are
printed in bold type.
6SE7087-6JK50
Operating Instructions SIMOVERT MASTERDRIVES
08.2008
Siemens AG