Operating instructions

Technical Data Vector Control Chassis Type Frequency Converter
476 869 4070 76 J AB-74 Siemens AG
4-14 Operating Instructions SIMOVERT MASTERDRIVES
Only Antifrogen N (make: Hoechst) is permitted as an anti-freeze
agent. The mixing ratio must be in the range of 20 % < Antifrogen N <
30 %. This ensures protection against frost from -10 °C to -17 °C.
If other agents are used, this could result in a reduction of the service
life.
If less than 20 % Antifrogen N is added, there is a higher risk of
corrosion which may cause a reduction in the service life.
If more than 30 % Antifrogen N is added, the heat transfer and thus the
function of the unit is affected. It must be observed that the necessary
pump delivery must be adjusted if Antifrogen N is added.
The following table can be used as a guide (coolant temperature 20 °C)
Antifrogen N
proportion of the
coolant
Kinematic viscosity
[mm²/s]
Relative pressure
loss
0 1.05 0.95
20 1.07 1.14
30 2.5 1.24
The required coolant current must be achieved.
If the coolant circuit is emptied, you either have to fill it up again after 14
days, or you have to flush it with water several times, and then blow out
the heat sinks.
If an anti-freeze agent (Antifrogen N) is used, no potential differences
are allowed to occur in the entire coolant circuit. If necessary, the
components have to be connected with a potential equalization bar.
PVC hoses are not suitable when anti-freeze agents are used!
Moisture condensation of the unit is not permissible (see standard
units).
Anti-freeze agent
WARNING