Siemens simovert masterdrives Betriebsanleitung Seite 303

05.2006
Hotwater-proof asbestos-based seals are suitable. For seals with
packing glands, graphite cord can be used. For pipe joints where hemp
is used, coating the hemp with fermit or fermitol has proved effective.
Antifrogen N can give rise to leakage at polytetrafluorethylene seals.
WARNING
Table 11-6
More than 45 % impedes heat dissipation and hence proper functioning
of the unit.
It must always be kept in mind that the pumping capacity required
for using Antifrogen N additive must be adjusted, and the
backpressure arising in the unit must also be taken into account.
The necessary coolant flow volume must be attained under all
circumstances.
The electrical conductivity of the coolant is increased when antifreeze is
added to the cooling water. Antifrogen N contains inhibitors to
counteract the attendant increased propensity for electrochemical
corrosion.
To prevent weakening of the inhibitors and the corrosion that would
then result, the following measures are necessary:
1. When the cooling system is drained, it must either be refilled with
2. The water and Antifrogen N mixture must be renewed every 3 to 5
If other antifreeze agents are used, they must be ethylene glycol
based. They must also have been approved by reputable companies in
the automotive industry (GM, Ford, Chrysler).
Example: DOWTHERM SR-1.
Concerning the electrical conductivity of the antifreeze and water
mixture, the antifreeze manufacturer's guidelines apply.
The water that is mixed with the antifreeze must strictly comply with the
defnition given in the Section "Definition of cooling water".
Siemens AG 6SE7087-6JK50
SIMOVERT MASTERDRIVES
Proportion of Kinematic
Antifrogen N viscosity
added [%] [mm²/s]
0 1.8
20 3.5
34 4.72
45 7.73
Antifrogen N material data at T = 0 °C coolant temperature
the same mixture within 14 days, or it must be flushed out with water
several times and the heat sinks must then be blow through with
compressed air.
years.
Operating Instructions
Technical Data
Relative Antifreeze
pressure loss protection to
[°C]
1.09
1.311 -10
1.537 -20
1.743 -30
11-15