Connection System; Commissioning, Service - Siemens SINAMICS S120 Equipment Manual

8.7

Connection system

The electrical connections on the SINAMICS S120 Liquid Cooled units must be made with
cables of the cross-section stipulated in the technical specifications for the relevant device.
The coolant connection is made using 3/4'' couplings.
The supply and return connections on the SINAMICS devices must be made with flexible,
non-conductive hose (see Section 8.3) so as to eliminate the risk of electrochemical
corrosion, to reduce transfer of vibration and to dampen pressure transients in the coolant.
The hose should be about 1.5 m in length (total of supply and return lines).
The coolant hoses should be connected before the units are mounted.
8.8

Commissioning, service

Commissioning
Once the modules have been installed in the plant, the coolant circuit must be commissioned
before the electrical systems.
• The heatsinks on Power Modules of frame sizes FL and GL and Motor Modules of frame
• The heatsinks on Basic Line Modules of frame sizes FBL, GBL and Motor Modules of
Service
The recommended servicing procedure for the cooling circuit is to check the fill level and the
coolant for discoloration or turbidity at least once a year.
If the coolant level has dropped, the loss should be corrected on closed or semi-open circuits
with a preprepared mixture of battery water (see Section 8.2) and inhibitor or Antifrogen N.
Chassis Power Units Liquid Cooled
SINAMICS S120 Equipment Manual, Edition 04/2007, 6SL3097-2AM00-0BP2
size GXL need not be vented before they are filled for the first time.
frame sizes HXL, JXL must be vented before they are filled for the first time.
– For this purpose, the units are fitted with a vent valve at the top and a vent hose at the
bottom. The air and/or coolant can be bled out of the unit via this hose and collected
underneath so that it cannot leak into the module.
– A stopper is inserted in the vent hose at the factory. This must be removed before the
heatsink is vented and inserted again afterwards.
Cooling circuit and coolant properties
8.7 Connection system
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