Baumuller DSC Series - Coolant consistency; Min. coolant temperature against ambient temperature and humidity

TAM 00682 28
DSC 045-100 07 / 2012
Three-phase synchronous motor English
9.6 Coolant consistency
The coolant must satisfy the following specifications:
Conditions Unit Value
Maximum permissible systempressure bar 6
Temperature of coolant- for motor °C 10 to 25
pH value (at 20 °C) --- 6.5 to 9
Overall hardness mmol / l 1.43 to 2.5
Chloride - Cl- mg / l < 200
Sulfate - SO
4
²- mg / l < 200
Oil mg / l < 1
Permissible particle size of solid foreign objects,
particles (e.g., sand)
mm < 0.1
Table 8: Coolant consistency
Clean water that is free of dirt and suspended matter must be used as a coolant.
9.7 Min. coolant temperature against ambient temperature and humidity
2
5
% r
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3
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10
15
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25
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0 5 10 15 20 25 30 35 40
ambient temperature (°C)
min. coolant temperature (°C)
Figure 12: Determination of the coolant temperature
The allowed coolant temperature depends on relative humidity and ambient temperature. For
example with an ambient temperature of 25 °C and a relative humidity of 65 % the minimum
coolant temperature is 18 °C. Because these are limiting values on practical side a coolant
temperature greater than 18 °C should be used.
If this minimum coolant temperature will be under run the two- point controller of Baumüller drive
must be used to avoid condensation (see figure 13 on next page).