Description
3.4 Design
SIMOTICS A-1FV5/1PV5 synchronous/induction motors
Operating Instructions, 03/2014, 610.45002.40
21
Materials used in the cooling circuit
The materials used in the cooling circuit must the coordinated with the materials in the motor
(aluminum alloy) and hose connection (nickel plated brass).
Materials and components in the cooling circuit
The following table lists a wide variety of materials and components which may or may not
be used in a cooling circuit.
Table 3- 6
Materials and components of a cooling circuit
Material
Used as
Description
Zinc
Pipes, valves and
fittings
Use is not permitted. Non-ferrous metals chips can lead to pitting
corrosion in galvanized pipes.
Zinc breaks down the glycol-based inhibitors.
Brass
Pipes, valves and
fittings
Can be used in closed circuits.
Copper
Pipes, valves and
fittings
Can be used only in closed circuits in which the heat sink and
copper component are separated (e.g. connection hose of the
units).
Common steel (e.g. St37)
Pipes
Permissible in closed circuits and semi-open circuits with
inhibitors or Antifrogen N, check for oxide formation, inspection
window recommended.
Cast steel, cast iron
Pipes, motors
Closed circuit and use of strainers and flushback filters. Fe
separator for stainless heat sink.
High-alloy steel, Group 1 (V2A)
Pipes, valves and
fittings
Can be used for drinking or municipal water with a chloride
content up to <250 ppm, suitable according to definition in
Chapter "Coolant definition".
High-alloy steel, Group 2 (V4A)
Pipes, valves and
fittings
Can be used for drinking or municipal water with a chloride
content up to <500 ppm, suitable according to definition in
Chapter "Coolant definition".
ABS (AcrylnitrileButadieneStyrene) Pipes, valves and
fittings
Suitable according to the definition in Chapter "Coolant
definition". Suitable for mixing with inhibitor and/or biocide as
well as Antifrogen N.
Installation comprising different
materials (mixed installation)
Pipes, valves and
fittings
Use is not permitted.
PVC
Pipes, valves,
fittings and hoses
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.
Recommendation: EPDM hoses with an electrical resistance
> 10
9
Ω (e.g. Semperflex FKD supplied from Semperit or
DEMITTEL; from PE/EPD, supplied from Telle).
Gaskets
Pipes, valves and
fittings
Use of Viton, AFM34, EPDM is recommended.
Hose connections
Transition
Pipe - hose
Secure with clips conforming to EN14420, available, e.g. from
the Telle company.