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126 Cooling and heating
Pressure limits
￭
Base pressure: 100...150 kPa (recommended); 200 kPa (maximum). Base pressure
denotes the pressure of the system compared with the atmospheric pressure when the
cooling circuit is filled with coolant.
Maximum design pressure: 500 kPa
Recommended design maximum pressure: 380 kPa.
Note: Contact ABB if you need to rise the pressure over this limit. The pressure difference
must be within given limits to avoid malfunction due to excessive coolant flow.
Nominal pressure difference: 110 kPa / 120 kPa (hydrostatic)
Maximum pressure difference: 170 kPa / 180 kPa (hydrostatic)
Water quality
￭
Tap water
The use of drinking water without gas/bubbles is allowed as follows:
•The water must fulfill the requirements of the Council Directive 98/83/EC of 3/11/98 on the quality of water
intended for human consumption.
Note: The following requirements apply to the water to be used in the coolant, not the water-glycol-inhibitor
mixture.
pH value
Chloride
Fluoride
Sulphate
Total dissolved solids
Total hardness as CaCO
Conductivity
The water must be clean of solid matter.
Freeze protection and corrosion inhibition
￭
WARNING!
Pay special attention to the composition of the coolant. Use the water-coolant
mixture specified by ABB in the internal cooling circuit. Adding any other ingredient
to the coolant may cause corrosion or dissolution of gaskets or adhesives used in
couplings. It may also affect the viscosity of the coolant and degrade the cooling
capacity of the cooling circuit and thus the load capacity of the converter. THE
WARRANTY DOES NOT COVER DAMAGE OCCURRING FROM USE OF
IMPROPER COOLANT.
Coolant concentration
ABB recommends diluting coolant 50:50 with water. Note that the concentration of coolant
should not be less than 33% and not more than 60%. Following table shows how the diluting
portion effects to frost protection.
3
6.0...8.0
< 50 mg/l
< 50 mg/l
< 100 mg/l
< 200 mg/l, no deposits are allowed at the temperature
of +57 °C (153 °F)
< 250 mg/l
< 400 µS/cm (this equals the resistance of
> 2500 ohm/cm)
The use of purified water which is not intended for hu-
man consumption is forbidden.
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