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Preparations for use
4.5 Configuration of the cooling circuit and coolant supply
4.5.2
Pressures and differential pressures in the cooling circuit
The maximum permissible overpressure in the heat sink and thus in the cooling circuit can be
found on the air-to-water-cooler and in the associated operating instructions.
● If you are using a pump, which reaches more than this maximum pressure, then on the plant
● The lowest possible differential pressure between the coolant in the supply and return lines
● The pressure drop is dependent on the machine type. The machine type is stamped on the
● If there is a risk of frost, use cooling water with antifreeze suitable for this temperature.
4.5.3
Components and materials of the cooling circuit
The following table lists a wide variety of materials and components which can occur in a
cooling circuit or which are prohibited.
Table 4-3
Materials and components of a cooling circuit
Material
Zinc
Brass
Copper
Steel (e.g. S235JR)
Cast steel, cast iron
High-alloy steel, Group 1
(V2A)
32
or system side ensure that the maximum pressure is not exceeded.
should be selected to allow use of pumps with a flat characteristic.
Machine type
1LN....-3A...-....
1MN....-3A...-....
1LN....-3B...-....
1LN....-4A...-....
1MN....-3B...-....
1MN....-4A...-....
1LN....-4B...-....
1MN....-4B...-....
rating plate.
The pressure drop increases when antifreeze is added.
Component
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Pipes, valves and fit‐
tings
Cable
Pipes, motors
Pipes, valves and fit‐
tings
Flow rate ± 10 %
[l/min]
115
150
200
Remark
Do not use any components manufactured out of zinc.
Can be used in closed cooling circuits with inhibitor.
Can only be used in closed cooling circuits with inhibitor. Locate an
isolating element, e.g. connecting pipe of the devices, between the
heat sink and copper component.
Can be used in closed cooling circuits with inhibitors or anti-freeze.
Check for the formation of oxide; to do this, use a sight glass, for
example.
Can be used in closed cooling circuits. Use sieves and return flush
filter; for stainless steel cooling systems, use a Fe separator.
Can be used for drinking or municipal water with a chloride content
< 250 ppm.
Pressure drop for fresh water
[bar]
0.3
0.3
0.3
SIMOTICS FD 1LN1
Operating Instructions 01/2019
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