Siemens SINAMICS S120 Manual page 116

Commissioning the cooling circuit
5.1 Coolant for the raw water circuit on the plant side
Note
Analyzing the liquid coolant
It is recommended that you contact the coolant manufacturer for analyzing the liquid coolant.
The coolant should be checked 3 months after the cooling circuit is filled for the first time
and, subsequently, once a year.
If the cooling water becomes cloudy, is colored, or becomes contaminated by mould spores,
the cooling circuit must be cleaned and refilled.
To better explain the coolant recommendations in this document, a number of problems
which can be encountered if the recommendations are ignored are listed in the table below.
Table 5- 2
Coolant property or limit-
Sea water
Water compliant with limit
values
Oxygen transfer
Chloride
Sulfate
Dissolved solids (e.g. sand)
Total hardness
Conductivity
Biological contamination
Oil residue
Mechanical contamination
Inadequate equipotential
bonding
116
Substances which can cause irreparable heat sink damage
value violation
Do not use sea water!
Use an appropriate concentration of antifreeze, cooling circuit must
include a pressure-relief valve.
Closed circuit, with pressure-relief valve, use the appropriate concen-
tration of antifreeze.
Use the appropriate concentration of antifreeze.
Dilute with de-ionized water until the sulfate content is within toler-
ance.
Purge the cooling circuit. Install dirt trap (e.g. strainers, fine filters).
Use the appropriate concentration of antifreeze.
Equipotential bonding of all circuit components.
Use of biocides, dirt traps (e.g. strainers, fine filters).
Use the appropriate concentration of antifreeze, flush cooling circuit
without SINAMICS.
Purge the cooling circuit. Install dirt trap (e.g. strainers, fine filters).
Connect all components to equipotential bonding system.
Countermeasure
Cabinet Modules liquid cooled
Manual, 10/2015, A5E37067587A