ABB ACS800-17LC, Руководство по оборудованию, Страница: 149 / 182

Internal cooling circuit
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WARNING! Operation at temperatures below 0 °C (32 °F) is not permitted even with
antifreeze.
Note: If more than 25% or DOW Propylene Glycol is added, the pressure loss in the
system increases. An operating pressure of more than 150 kPa is required for
sufficient flow.
Materials
Materials used in the internal cooling circuit are listed below. Note: These are also
the only materials that can be used in the external cooling circuit.
• stainless steel AISI 316L (UNS 31603)
• heavy gauge aluminium
• plastic materials such as PA, PEX and PTFE
Note: PVC hoses are not suitable for use with antifreeze.
• rubber gasketing NBR (nitrile rubber).
WARNING! If connecting external piping to the internal cooling circuit, use only
materials that are specified above. Copper and brass must not be used under any
circumstances. Even minor dissolution of copper can cause copper precipitation on
aluminium and subsequent galvanic corrosion. The liquid cooling system may not
contain any zinc eg, galvanized pipes, at all since zinc would react with the inhibitor.
If the plant incorporates normal iron pipes or cast iron accessories eg, motor
housings, a liquid cooling unit with a heat exchanger (such as the ACS800-1007LC)
must be used to separate the systems.