Antifreeze Additive - Siemens DC-AC Betriebsanleitung

Technical Data
11.1.3.2

Antifreeze additive

WARNING
NOTE
11-16
By the use of antifreeze, the lower operating temperature limit can be
reduced from + 5 °C to 0 °C, and when not operating the system is
protected against freezing at temperatures down to − 30 °C.
Because of its physical properties (heat absorption, thermal
conductivity, viscosity), antifreeze reduces cooling system efficiency. It
should only be used when absolutely necessary.
Reduction curves for antifreeze are given in the Section "Application"
(Figs. 11-4 and 11-5). Without derating, premature aging of unit
components cannot be ruled out. Converter tripping by the
overtemperature protection must also be expected.
Operation at temperatures of < 0 °C is not permitted, not even with
antifreeze!
Use of other media can shorten the service life.
If less that 20 % Antifrogen N is added to the cooling water, the risk of
corrosion is increased, which can shorten the service life.
If more than 30 % Antifrogen N is added to the cooling water, this will
have an adverse effect on heat dissipation and hence on the proper
functioning of the unit. It must always be kept in mind that a higher
pumping capacity is required when Antifrogen N is added to the cooling
water.
When antifreeze is used, no potential differences must occur in the
whole cooling system. If necessary, the components must be
connected with an equipotential bonding strip.
Where antifreeze is concerned, pay attention to the information given in
the safety data sheet!
Antifrogen N (made by Clariant, www.clariant.com) is preferred for use
as antifreeze.
The safety data sheet is appended.
Background:
Antifrogen N was thoroughly analysed for this application. Special
attention was given to compatibility with other materials and to
environmental and health aspects. Furthermore, many years of
experience have been gained with Antifrogen N, and the definition of
cooling water is based on this antifreeze agent.
In order to obtain the benefit of the good anti-corrosive properties of
Antifrogen N and water mixtures, the concentration of the mixture must
be at least 20 %.
The use of antifreeze places higher demands on cooling system
tightness because the surface tension of the Antifrogen and water
mixture is about 100 times smaller than that of pure water.
6SE7087-6KN50
Operating Instructions SIMOVERT MASTERDRIVES
08.2008
Siemens AG