Service - Siemens SINAMICS S120 Equipment Manual

Cooling circuit and coolant properties

8.8 Service

Liquid-cooled devices must be completely dry before being switched on and put into
operation.
Ensure that no liquid coolant is sprayed onto the devices or additionally mounted electrical
components.
The equipment must be shut down immediately if there any leaks causing liquid to escape
(drips or pools)!
Failure to observe this gives rise to a risk of short-circuits, causing damage and
malfunctions.
CAUTION
For the cooling circuit to function correctly, vent the circuit to ensure that it does not contain
any air bubbles.
8.8 Service
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 prepared mixture of battery water and inhibitor or Antifrogen N.
248
WARNING
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1