8
1
7
KEB COMBIVERT F5
Name: Basis
10.04.02
Special Operation
Section
Page
Date
©
KEB Antriebstechnik, 2002
All rights reserved
Chapter
8.1.5 Information about
Water Cooling
In continuous operation water-cooled inverters are operated with lower temperature
than air-cooled inverters.This has positive effects on the lifetime of the components
like fan and DC link capacitors. Also the temperature dependent switching losses
are positively effected.
The temperature shall be max. 40
∞
C. Select a long cycle time in An.46 or An.52 to
avoid moisture condensation (see chapter 8.1.1). During transport or storage below
freezing point, the water cycle should be drained completely using compressed air.
The max. operating pressure of the cooling system shall not exceed 6 bar (special
versions with higher pressures are available).
Temperature and Operating
Pressure
Cooling Water Quality
The machined aluminium heat sinks are sealed with sealing rings and by bonding,
dismountable (screwed) and they have a surface protection in the channels
(anodized). As standard the heat sinks are maintenance-free!
There are no special requirements for the coolant.The VGB-cooling water instructions
must be observed for a safety operation. The coolant must be free of acid, abrasive
materials and pressure surges and it shall not be aggressive to the material.
Measures against pollution and calcination must be done externally, if neccessary
with a filter.
Materials
Pollution of the water
Mechanical impurities
Excessive hardness
Moderate content of mechanical
impurities and hardness formers
Moderate content of chemical
impurities
Biological impurities myxobacteria
and algae
Process
Filtration of water via
- sieving filter
- sand filter
- cartridge filter
- precoated filter
Softening of the water by ion exchange
Injection of stabilisers or dispersants into the
water
Injection of passivators and/or inhibitors into
the water
Injection of biocides into the water
The main impurities and most usual procedures for eliminating them are:
