Inhibitors, Anti-Freeze, Biocides - Siemens SINAMICS S120 Equipment Manual

Cooling circuit and coolant properties
8.2 Coolant definition
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 Table 8-5.
Table 8-5 Substances which can cause irreparable heatsink damage
Coolant property or limit-value
violation
Sea water
Water compliant with limit values
Oxygen transfer
Chloride
Sulphate
Dissolved solids (e.g. sand)
Total hardness
Conductivity
Biological contamination
Oil residue
Mechanical contamination
Inadequate equipotential bonding
8.2.1

Inhibitors, anti-freeze, biocides

Table 8-6 Overview and application of coolant additives
Inhibitor use without Necessary
antifreeze effect
Anti-freeze Antifrogen N 20 % < X ≤ 45 %,
no additional inhibitor required
Biocide Yes
Anti-freeze + An Antifrogen N anti-freeze
biocide content of >20 % provides an
adequate biocidal effect.
Inhibitor use without antifreeze effect
The NALCO 00GE056 inhibitor (Manufacturer: Nalco) must always be used in a mixing
proportion of 0.2 % to 0.25 %.
Inhibitors can be used only in water with the properties defined in Section 8.2 which must not
contain any magnesium carbonate.
Control kits can be ordered from Nalco to check the inhibitor concentration.
8-14
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. strainer, fine
filter).
Use of inhibitors, Antifrogen N proportion X of 20 % < X ≤ 45 %.
Equipotential bonding of all circuit components.
Use of biocides, dirt traps (e.g. strainer, fine filter).
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. strainer, fine
filter).
Connect all components to equipotential bonding system (Subsection 8.1.5).
Application with SINAMICS
S120 Liquid Cooled with
aluminum-heatsink
Countermeasure
Application with SINAMICS
S120 Liquid Cooled with
stainless steel-heatsink
Not necessary
Antifrogen N 20 % < X ≤ 45 %
Yes
An Antifrogen N anti-freeze
content of >20 % provides an
adequate biocidal effect.
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
Important note
Inhibitor 0.2 % to 0.25 % of
total volume!
Cooling circuit with open
pressurizer
Chassis Power Units Liquid Cooled