Siemens simovert masterdrives Operating Instructions Manual page 200

Installation
Water cooling
Built-in components
in the roof section
Implementation of
the DC 24 V auxiliary
supply
5-8
The units with water cooling (MLFB Annex: -1AA0 / -1AA1) are suitable
for installing in an enclosed cabinet (IP54). The components not
mounted on the heat sink, such as the electronics and the DC link
capacitors are cooled by heat transfer at the heat sink fins. To enable
this heat transfer to take place, air circulation inside the unit is
necessary.
Therefore, when installing the chassis unit in a cabinet, you must make
sure that the air being discharged from the fan can flow into the inside
of the chassis. The partitions to be provided in units with air cooling
are a disturbing factor in this case! They should not be mounted.
For an application in the types of protection > IP40, a distance of at
least 90 mm must be observed between the top of the units and the top
of the cabinet.
The units do not require external cooling air.
Additional losses cannot be dissipated!
1-inch internal threads are envisaged for the water connection. The
connecting nipples should be made of stainless steel or thick-walled
aluminium. Ideally, the connection should have flat seals. If the
connecting pieces enclosed with the units are used, these should be
sealed with Loctite 542 or with teflon tape.
Cooling water infeed (blue) and return (red) must be connected
according to the color scheme! The color markings can be found next to
the 1-inch water connection below the heat sink.
If components are built into a cabinet roof section (DC bus, DC 24 V
supply), these should be placed in the center if possible so that the air
leaving the fans can reach the openings in the roof cover unobstructed.
In order to ensure that the units can function satisfactorily (in view of
electromagnetic influences), it may be necessary to provide each
chassis unit with its own DC 24 V auxiliary supply with an isolating
transformer.
6SE7087-6KN50
Operating Instructions SIMOVERT MASTERDRIVES
06.2006
Siemens AG