Anti-Freeze Additive; Biocide Additives (Only If Required) - Siemens Sinamics S120 Manual

13.2.3

Anti-Freeze Additive

Antifrogen N (the Clariant company) is recommended as antifreeze. The percentage of
antifreeze must be between 20% and 30%. This ensures frost protection down to a
temperature of at least -10 °C.
NOTICE
Damage caused by overheating when using antifreeze
The cooling system no longer functions if an excessively high percentage of antifreeze is
used.
• The maximum percentage of antifreeze must not exceed 30 %.
Danger to life through electric shock caused by a cooling system leak
Cooling water mixtures with Antifrogen N are highly conductive. If the insulation does not
function, this will result in death or severe injury if you come into contact with it.
• After a coolant leak, clean the insulation system.
NOTICE
Damage to EPDM hoses as a result of additives containing oil
EPDM is destroyed by anticorrosion agents.
• When using EPDM hoses, do not use oily anticorrosion agents.
Note
Adapting the pump power
The kinematic viscosity of the cooling water is changed when adding antifreeze.
• Correspondingly adapt the pump power.
13.2.4

Biocide additives (only if required)

Closed cooling circuits with soft water (°DH > 4) are susceptible to microbes. The risk of
corrosion caused by microbes is virtually non-existent in chlorinated drinking water systems.
If Antifrogen N antifreeze is used with a concentration of 20% or higher, it can be assumed
that there is an adequate biocide effect.
The following types of bacteria are encountered in practice:
● Bacteria that cause the formation of slime
● Corrosive bacteria
● Bacteria that cause deposits of iron
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
WARNING
Cooling circuit and coolant properties
13.2 Coolant requirements
805