Operation Of Liquid-Cooled Devices; General Information; Pressure In The Liquid Cooler; Material Of The Heat Sink - KEB COMBIVERT F5 Instructions For Use Manual

OPerATION OF LIqUID-cOOLeD DeVIceS

5 Operation of liquid-cooled devices

5.1 General information

In continuous operation liquid-cooled drive converters are operated with lower temper-
ature than air-cooled devices. This has positive effects on lifetime-relevant components
such as fan and DC link circuit capacitors and power modules (IGBT). Also the tem-
perature dependent switching losses are positively effected. The use of liquid-cooled
KEB COMBIVERT drive converters is offered in the drive technology, because there are
process-caused coolants available with some applications.

5.1.1 Pressure in the liquid cooler

concept of pressure
System test pressure
Operating pressure
Max. permissible operating
pressure
Table 13: Pressure in the liquid cooler

5.1.2 Material of the heat sink

Design system
Extrusion casting heat sink
Aluminium heat sink with
pressed pipes
Table 14: Heat sink and operating pressure
The aluminium liquid coolers are sealed with sealing rings and posses a surface protec-
tion (anodized) even in the ducts.
ATTENTION
54
Value Description
Hydrostatic pressure used to test the integrity and tight-
20 bar
ness of the heat sink.
=> Diagrams
Internal pressure that occurs at a certain point in time
of the cooling
as a function of the volume flow in the heat sink.
design
Highest temporary pressure, including pressure surge,
10 bar
which the heat sink will resist.
Material (voltage)
Aluminium (-1.67 V)
Stainless steel (-1.04V)
In order to avoid a deformation of the heat sink and the damages there-
by, the indicated max. operating pressure may not be exceeded briefly
also by pressure peaks.
connection
2 x hose connection G1/2 with mounting nut
Outer pipe diameter Ø 12 mm for 2 x function
nuts (optional)