Siemens SIMOTICS FD 1LL1, Operating Instructions & Installation Instructions

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Table 4-2 Substances that can destroy the cooling system
Coolant property or limit value vi‐
olation
Countermeasure
Seawater Do not use seawater.
Water compliant with limit values Use inhibitors/antifreeze with the appropriate concentration. Locate
a pressure relief valve in the cooling circuit.
Entry of oxygen Use a closed cooling circuit. Locate a pressure relief valve in the
cooling circuit.
Use inhibitors/antifreeze with the appropriate concentration.
Chloride Use inhibitors/antifreeze with the appropriate concentration.
Sulfate Dilute the coolant using de-ionized water until the limit value is
reached.
Solids (e.g. sand) Flush the cooling circuit, without converter and motor. Use dirt fil‐
tering equipment, e.g. sieves, fine filters.
Total hardness Use inhibitors/antifreeze with the appropriate concentration.
Conductivity Connect an equipotential bonding conductor to all cooling circuit
components.
Biological contamination Use biocides. Use dirt filtering equipment, e.g. sieves, fine filters.
Oil residue Use inhibitors/antifreeze with the appropriate concentration.
Flush the cooling circuit, without converter and motor.
Mechanical contamination Flush the cooling circuit, without converter and motor. Use dirt fil‐
tering equipment, e.g. sieves, fine filters.
Inadequate equipotential bond‐
ing
Connect an equipotential bonding conductor to all cooling circuit
components.
See also
Inhibitors, anti-freeze, biocides (Page 39)
Cooling water intake temperature
The maximum cooling water intake temperature is 25 °C.
NOTICE
Condensation for an excessively low cooling water intake temperature
If the temperature difference between cooling water and ambient temperature is greater than
5 K, this may result in condensation forming in the machine. This results in material damage.
● Make sure that the condensation can drain away freely.
● Adopt appropriate measures to achieve the required intake temperature of the cooling
water.
● Alternatively, dry the ambient air.
Preparations for use
4.5 Coolant specification
SIMOTICS FD 1MH1
Operating Instructions 08/2017
37