The temperature difference between the actual ambient air tem‐
perature and the coolant inlet temperature must not be greater
than between maximum ambient air temperature and moisture
condensation temperature to be expected!
Coolant
Water-based coolant
Risk of damage to components.
NOTICE
●
Observe the required properties and the appropriate composition of the
coolant.
●
For transport and storage of the components, make sure sufficient anti‐
freeze is provided (see chapter "Transport and storage").
Required properties
Most cooling systems use water as coolant. The values given in the technical
data of the components thus refer to the coolant water with a maximum volu‐
metric content of 3% coolant additives.
The water-based coolant must have the following properties:
●
pH value: 7-8.5
●
Hardness: max. 10 °dH (England: 12.5 °e; France: 17.8 °f; USA: 178
ppm CaCO
3
)
●
Chloride: max. 20 mg/l
●
Nitrate: max. 10 mg/l
●
Sulfate: max. 100 mg/l
●
Insoluble substances: max. 250 mg/l
Drinking water in Germany complies with these requirements.
Antifreeze
Coolant with antifreeze may only be used for transport and storage of the
components (see chapter "Transport and storage").
Protection against corrosion
●
For protection against corrosion and chemical stabilization, an appropri‐
ate additive must be mixed with the cooling water.
●
The required mixing ratio (according to manufacturer's data sheet) must
be complied with and checked. Deviations can cause:
–
Reduction of cooling capacity
–
Changes in emulsion stability
–
Unexpected behavior with gasket materials
–
Reduction of protection against corrosion
●
The coolant should be chemically neutral (pH-value approx. 7).
●
Use closed circuit. An open circuit should not be used for cooling, be‐
cause deposits and corrosion (e.g., from hard water) worsen the heat
transfer or completely clog up cooling channels.
If the required mixing ratio exceeds the maximum permitted addi‐
tion, the cooling system must be calculated with the resulting
coolant.
Anti-corrosion additive
Aqueous solutions ensure reliable protection against corrosion without nota‐
ble changes in the physical properties of the water.
DOK-INDRV*-HXX05******-PR02-EN-P
Bosch Rexroth AG
77/407
Rexroth IndraDrive ML Drive Systems with HMU05
Combining the individual components
