Siemens SINAMICS S120 Manual page 125

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- 5 Substances which can cause irreparable heat sink damage
Problem
Increased corrosion,
deposits
Erosion/particles
Whitish deposits
Electrical corrosion
Deposits, residues,
algae
Note
Flushing the cooling circuit
"Flushing the cooling circuit" involves the following process:
1. Drain the old coolant from the cooling circuit
2. Fill the cooling circuit with fresh coolant
3. Operate the cooling circuit for some time (up to approximately 1/2 hour)
4. Drain the coolant again and clean the filter
5. Fill the cooling circuit with fresh coolant
Cabinet Modules liquid cooled
Equipment Manual, 04/2020, A5E37067587A
Possible causes/consequences
Properties of the coolant or limit value
exceeded
Sea water
Water compliant with limit values
Chloride
Sulfate
Suspended solids (e.g. sand)
Excessively high total hardness
Voltage potential can be identified
Inadequate equipotential bonding
Biological contamination
Oil residue
Mechanical contamination
Commissioning the cooling circuit
5.3 Coolant for the internal deionized water circuit
Countermeasure
Do not use sea water!
Use an appropriate concentration of antifreeze, cool-
ing circuit must include a pressure-relief valve.
Use the specified coolant basis and the appropriate
concentration of antifreeze.
Dilute with deionized water until the limit value is
reached.
Flush cooling circuit without SINAMICS devices. In-
stall dirt trap (e.g. strainers, fine filters).
Use the specified coolant basis and the appropriate
concentration of antifreeze.
Provide all components with an equipotential bonding
system.
Use of biocides, dirt traps (e.g. strainers, fine filters).
Use the appropriate concentration of antifreeze, flush
cooling circuit without SINAMICS.
Flush cooling circuit without SINAMICS devices. In-
stall dirt trap (e.g. strainers, fine filters).
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