Description
3.3 Design
Synchronous/induction motors 1PH813
Operating Instructions, 04/2009, 610.48000.22
23
Water cooling
The motor can only be operated in a closed cooling-water circuit with a heat-exchanger unit.
The motor is connected to the cooling circuit by means of two female threads on the rear of
the motor. The operator can decide on the best method of connecting the inlet and outlet.
Cooling water connection G3/8"
Cooling water flow 12 l/min
Max. pressure at inlet 6 bar
Pressure loss between inlet and outlet 0.9 bar
Min. cooling water inlet temperature T
cooling
> T
ambient
- 5 K
Max. cooling water inlet temperature +30 °C
Only water enriched with appropriate quantities of additives to protect against corrosion and
minimize the growth of algae can be used as a coolant.
If there is a risk of frost, preventive measures must be taken during operation, storage, and
transportation (anti-freeze, emptying and blowing out with air, etc.).
A filter (100 µm) must be installed in the inlet pipe to protect the motor against
contamination. Additional protection for the motor must be provided by means of a pressure
relief valve installed downstream of the filter.
The values specified for the cooling water also apply to the requirements of closed cooling
circuits. Not all of the specified concentrations will occur in the cooling water at the same
time.
Cables and fittings can be made out of brass, stainless steel, or plastic. If different materials
are used in close proximity to each other, however, the electrochemical series must be taken
into account, which is why zinc must not be used in cooling water circuits.
If a throttle is needed to restrict the flow, it is best to install it downstream of the motor. It
must not be installed directly in front of the inlet because the effects of cavitation may
damage the motor.
Table 3- 5 Chemical requirements of the cooling water
Content and chemical composition Value
pH value 6 - 9
Chloride ions < 40 ppm
Sulfate ions < 50 ppm
Nitrate ions < 50 ppm
Dissolved solids < 340 ppm
Total hardness < 170 ppm
Electrical conductivity < 500 μS/cm
Size of any particles in the coolant < 100 µm
Tyfocor anti-freeze 20 - 30 %
NALCO 00GE056 inhibitor 0,2 - 0,25 %
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