Siemens SINAMICS S120 Equipment Manual page 231
Chassis liquid cooled power units
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Table 8- 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 pipes
6. Inspection window
7. Dirt traps (strainers)
8. Pressure measuring point
9. Connection hose
10. Heat exchangers
11. Bypass valve
12. Coolant
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1
Explanation
Required in cooling circuits with aluminum owing to the hydroxide reaction with H
the reaction product.
Closed pressure compensator if possible, normal type used for heating systems suitable
only for closed cooling circuits, with inhibitors or Antifrogen N.
Required for systems with very powerful pumps and to dissipate H
Delivery area made of stainless steel, avoid use of grey cast iron wherever possible.
Stainless steel, also common steel in closed circuits with inhibitors in the coolant.
Recommended for diagnosing turbidity and discoloration of the coolant which can
indicate 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, but a copper heat exchanger can be used as an alternative in
closed circuits.
May be necessary to protect against condensation.
See the section entitled "Coolant definition".
Cooling circuit and coolant properties
8.1 Cooling circuits
.
2
as
2
229
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