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Description
3.3 Re-cooling unit
See also
Double submodule (Page 33)
3.3
Re-cooling unit
3.3.1
Operating principle of the re-cooling unit
The re-cooling unit dissipates the heat loss from the drive. The deionized water in the internal
water circuit absorbs the heat of the drive power unit which is to be dissipated, and is pumped
to the heat exchanger by a maintenance-free circulating pump. The warm deionized water is
cooled by the external raw water circuit and pumped back to the drive.
Two pipes are installed in the drive. The cold water of the re-cooling unit flows in one of the
pipes, and is heated by the losses and flows back to the re-cooling unit through the other pipe.
For additional information, refer to the operating instructions of the re-cooling unit.
3.3.2
The internal deionized water circuit
The internal water circuit is filled with deionized water (deionized, fully-desalinated water). The
conductivity of the cooling water must be ≤ 1 µS/cm in operation.
NOTICE
Inadmissible additives in the deionized water
Inadmissible additives in the deionized water can cause the cooling system to fail. This could
damage the drive.
Use only deionized water that corresponds to the specifications. The specification of the
deionized water can be found in the documentation for the re-cooling unit.
● The re-cooling unit monitors the level of the deionized water expansion tank and the motor
● The pressure of the deionized water is displayed on a manometer.
● The flow, temperature, and conductivity are monitored.
● If one of the monitoring devices responds, a signal is output or the re-cooling unit and drive
30
circuit-breaker for the pump motors and checks for any water leakage.
are switched off.
SINAMICS SM120 6SL38855?B
Operating Instructions 12/2015
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