Mechanical properties
3.1 Cooling
S-1FT7 synchronous motors
42 Configuration Manual, 09/2018, A5E45099423B AA
Materials and components in the cooling circuit
Note
Minimizing electrochemical processes in the cooling circuit
The electrochemical processes that take place in a cooling system must be minimized by
choosing the right materials.
Avoid combinations of different materials, such as copper, brass, iron, or halogenated plastic
(PVC hoses and seals).
The following table lists a wide variety of materials and components that may or must not be
used in a cooling circuit.
Table 3- 6 Materials and components of a cooling circuit
Zinc Pipes, valves and
Use is not permitted.
Brass Pipes, valves and
Can be used in closed circuits with inhibitor.
Copper Pipes, valves and
fittings
Can be used only in closed circuits with inhibitors in which the
heat sink and copper component are separated (e.g. connection
Common steel (e.g. St37) Pipes Permissible in closed circuits and semi-open circuits with inhibi-
tors or Antifrogen N, check for oxide formation, inspection win-
Cast steel, cast iron Pipes, motors Closed circuit and use of strainers and flushback filters. Fe sepa-
rator for stainless heat sink.
High-alloy steel, Group 1 (V2A) Pipes, valves and
fittings
Can be used for drinking or tap water with a chloride content up
to < 250 ppm, suitable according to definition in Chapter "Cooling
water."
High-alloy steel, Group 2 (V4A) Pipes, valves and
fittings
Can be used for drinking or tap water with a chloride content up
to < 500 ppm, suitable according to definition in Chapter "Cooling
ABS (
crylnitrile
utadiene
tyrene) Pipes, valves and
fittings
Suitable according to definition in Chapter "Cooling water." Suit-
able for mixing with inhibitor and/or biocide as well as Antifrogen
Installation comprising different
materials (mixed installation)
Pipes, valves and
Use is not permitted.
PVC Pipes, valves,
Use is not permitted.
Hoses Reduce the use of hoses to a minimum (device connection).
Must not be used as the main pipe for the whole system. Rec-
ommendation: EPDM hoses with an electrical resistance > 10
9
Ω
(e.g. Semperflex FKD supplied by Semperit or DEMITTEL; from
PE/EPD, supplied by Telle).
Gaskets Pipes, valves and
Use of FPM (Viton), AFM34, EPDM is recommended.
Hose connections Transition
Hose - pipe
Secure with clips conforming to DIN EN 14420, available, e.g.
from Telle.
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