Siemens Sinamics S120 Manual page 314

Cooling circuit, coolant properties and protection against condensation
9.1 Cooling circuits
Table 9- 2 Components of the closed cooling circuit
Component
1. Pressure relief valve
2. Pressure compensator
(pressurizer)
3. Pressure relief dP valve
4. Pump
5. Connecting cables
6 Sight glass
7. Dirt trap (strainer),
mesh width ≤100 µm
8. Pressure measuring location
9. Connecting hose
10. Heat exchangers
11. Bypass valve
12. Coolant
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Explanation
Required in cooling circuits with aluminum owing to the hydroxide reaction with H
the reaction product.
Closed pressure compensator if possible on the suction side of the pump, normal type
used for heating systems suitable only for closed cooling circuits, with antifreeze, see
Chapter Antifreeze, biocides, inhibitors (Page 335).
Required for systems with very powerful pumps and to dissipate H
Delivery area made of stainless steel, avoid use of cast iron wherever possible.
Stainless steel, also common steel in closed circuits with antifreeze in the coolant.
Recommended for diagnosing turbidity and discoloration of the coolant which can indi-
cate ageing or corrosion problems.
Dissolved substances (reaction products) must be trapped before they cause blockages
in the heat sink!
Required for servicing.
EPDM hose
Ideally of stainless steel, also copper-brazed in closed circuits.
The customer must take measures to protect the devices against condensation, e.g.
with a bypass valve.
It must be ensured that unfiltered cooling water does not get into the cooling circuit of
the converter.
See Chapter Coolant properties (Page 332).
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Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7
as
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