Notes On Materials - Siemens 6SE7087-8KN50 Instructions De Service

Technical Data
11.1.5

Notes on materials

NOTICE
11-20
Various measures can be taken to afford protection against
condensation:
1. Temperature control is recommended for this purpose (see Fig.
11-3). The water temperature is controlled as a function of room
temperature. This method is certainly to be preferred where there
are high room temperatures, low water temperatures and high
humidities.
2. Physical dehumidifying. This is only effective in closed rooms. It
comprises operating an air/water heat exchanger with cold water to
constantly condense the moisture out of the room air.
3. A humidity alarm can be installed to give a warning when
condensation is imminent. Such an alarm is available from
ENDRICH (www.endrich.com); when the temperature falls to within
2 K of dew point, a signal contact closes.
Cooling water installations with copper pipes and/or copper joints are to
be avoided and are possible only if special measures are taken, e.g.
closed cooling circuit, full filtering (i.e. copper ions are filtered out),
water additives (such as the products of Nalco Deutschland GmbH;
www.nalco.com; D-60486 Frankfurt, Tel. +49-697934-410).
The hose connection nozzles on the heat sink side must be of stainless
steel or heavy gauge aluminium. Under no circumstances may the
connection nozzles be of brass or copper.
PVC hoses are not suitable for use with antifreeze!
Hard PVC pipes are suitable for use with the antifreeze agents listed in
Section "Antifreeze additive".
The water cooling system must not contain any zinc at all.
Where antifreeze is used, please note:
zinc reacts with all glycol-based inhibitors.
Never use galvanized pipes for this reason!
If the plant incorporates normal iron pipes or cast iron
accessories (e.g. motor housings), a separate cooling system with
water/water heat exchangers is to be installed for the converters.
If a heat exchanger made of CuNi 90/10 is used, be sure to pay
attention to the water conductivity (hose) (see Section "Note regarding
installation and components").
6SE7087-7KN50
Operating Instructions SIMOVERT MASTERDRIVES
08.2008
Siemens AG