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158 Internal cooling circuit
Pressure limits
￭
Base pressure: 250 kPa (recommended); 300 kPa (maximum). "Base pressure" denotes
the pressure of the system compared with the atmospheric pressure when the cooling
circuit is filled with coolant.
Air counterpressure in expansion vessel (with ACS880-1007LC cooling unit): 80 kPa
Design pressure (PS): 600 kPa
Nominal pressure difference: 120 kPa with Antifrogen® L 25% coolant solution, 140
kPa with Antifrogen® L 50% coolant solution. This has to be taken into account when
dimensioning the liquid cooling circuit.
Maximum pressure difference: 160 kPa
Coolant flow rate limits
￭
The maximum coolant flow rate for all drive equipment is 1.3 × nominal. See the
technical data chapter for nominal values.
Cooling circuit materials
￭
Materials used in the internal cooling circuit are listed below.
•
stainless steel AISI 316L (UNS 31603)
•
heavy gauge aluminum
•
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 you connect external piping to the internal cooling circuit, use only
materials that are specified above. Other materials can cause galvanic
corrosion. If the external piping contains other materials, use a cooling
unit with a heat exchanger (for example, ACS880-1007LC) to keep the
external piping separate from the internal cooling circuit.
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