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Preparations for use
4.6 Coolant specification
To better explain the coolant recommendations in this document, some of the problems that
can be encountered if the recommendations are ignored are listed in the table below.
Table 4-4
Coolant property or limit value vi‐
olation
Seawater
Water compliant with limit values Use inhibitors/antifreeze with the appropriate concentration. Locate
Entry of oxygen
Chloride
Sulfate
Solids (e.g. sand)
Total hardness
Conductivity
Biological contamination
Oil residue
Mechanical contamination
Inadequate equipotential bond‐
ing
See also
Inhibitors, anti-freeze, biocides (Page 36)
NOTICE
Corrosion due to insufficient cooling water quality
The materials used in the cooler are selected to match the cooling water quality for which the
air-water cooler was ordered. The cooler cannot be simply used without taking any other
measures if other water conditions apply. If the cooling water quality is unsuitable, the air-to-
water heat exchanger may suffer corrosion and fail.
● The chemical composition of the cooling water must comply with the configuration
● If the cooling water quality fails to satisfy the quality stated on the order, please contact the
● Please observe the recommended water quality in the operating instructions for the air-
34
Substances that can destroy the cooling system
specifications.
Service Center.
water cooler.
Countermeasure
Do not use seawater.
a pressure relief valve in the cooling circuit.
Use a closed cooling circuit. Locate a pressure relief valve in the
cooling circuit.
Use inhibitors/antifreeze with the appropriate concentration.
Use inhibitors/antifreeze with the appropriate concentration.
Dilute the coolant using de-ionized water until the limit value is
reached.
Flush the cooling circuit, without converter and motor. Use dirt fil‐
tering equipment, e.g. sieves, fine filters.
Use inhibitors/antifreeze with the appropriate concentration.
Connect an equipotential bonding conductor to all cooling circuit
components.
Use biocides. Use dirt filtering equipment, e.g. sieves, fine filters.
Use inhibitors/antifreeze with the appropriate concentration.
Flush the cooling circuit, without converter and motor.
Flush the cooling circuit, without converter and motor. Use dirt fil‐
tering equipment, e.g. sieves, fine filters.
Connect an equipotential bonding conductor to all cooling circuit
components.
SIMOTICS FD 1LN1
Operating Instructions 01/2019
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