Inhibitors, Anti-Freeze, Biocides - Siemens SINAMICS S120 Equipment Manual
Chassis liquid cooled power units
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Also See for SINAMICS S120:
- Function manual (1094 pages) ,
- Diagnostic manual (947 pages) ,
- Manual (848 pages)
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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 8- 4
Substances which can cause irreparable heat sink damage
Coolant property or limit-value violation
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
8.2.2
Inhibitors, anti-freeze, biocides
Table 8- 5
Overview and application of coolant additives
Inhibitor without anti-
freeze effect
Anti-freeze protection
Biocide
Anti-freeze + biocide
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1
Do not use sea water!
Use of inhibitors, Antifrogen N proportion X of 20 % < X ≤ 45 %, circuit must
include a pressure-relief valve.
Closed circuit with pressure-relief valve, use of inhibitors, Antifrogen N proportion
X of 20 % < X ≤ 45 %.
Use of inhibitors, Antifrogen N proportion X of 20 % < X ≤ 45 %.
Dilute with de-ionized water until the sulphate content is within tolerance.
Rinse cooling circuit without SINAMICS units. Install dirt trap (e.g. strainers, fine
filters).
Use of inhibitors, Antifrogen N proportion X of 20 % < X ≤ 45 %.
Equipotential bonding of all circuit components.
Use of biocides, dirt traps (e.g. strainers, fine filters).
Use of inhibitors or Antifrogen N proportion X of 20 % < X ≤ 45 %, rinse cooling
circuit without SINAMICS units.
Rinse cooling circuit without SINAMICS units. Install dirt trap (e.g. strainers, fine
filters).
Connect all components to equipotential bonding system.
Application with SINAMICS
S120 Liquid Cooled with
aluminum heat sink
Required
Antifrogen N 20 % < X < 45 %,
no additional inhibitor required
Yes
An Antifrogen N anti-freeze
content of >20 % provides an
adequate biocidal effect.
Cooling circuit and coolant properties
Countermeasure
Application with SINAMICS
S120 Liquid Cooled with
stainless steel heat sink
Not necessary
Antifrogen N 20 % < X ≤ 45 %
Yes
An Antifrogen N anti-freeze
content of >20 % provides an
adequate biocidal effect.
8.2 Coolant definition
Important note
Inhibitor 0.2 % to 0.25 % of
total volume!
Cooling circuit with open
pressurizer
241
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