Siemens SINAMICS S120 Equipment Manual page 279

Service for the cooling circuit
The following service is recommended for the cooling circuit:
● The coolant should be checked 3 months after the cooling circuit is filled for the first time
and, subsequently, once a year.
When analyzing the coolant, the concentration and the general conditions of the
inhibitor/antifreeze should be checked.
● If the cooling water becomes cloudy, is colored, or becomes contaminated by mold
spores, the cooling circuit must be cleaned and refilled.
● It is recommended that you contact the coolant manufacturer to analyze the liquid
coolant.
● If the coolant level has dropped, the loss should be corrected for closed or semi-open
circuits with a prepared mixture of coolant basis and antifreeze, see Chapters "Coolant
properties (Page 260)" and "Antifreeze + biocide (Page 262)".
Maintaining coolant hoses
The coolant hoses must be inspected in regular intervals for cracks and leaks. If there are
any leakages at the hose joints, the flat seal may need to be replaced.
EPDM hoses with cracks or that the leak should be replaced.
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0
Maintenance and service
10.2 Maintenance
279