Bosch Rexroth MSK030B-0900-NN Project Planning Manual page 233

DOK-MOTOR*-MSK********-PR12-EN-P
Synchronous Servomotors MSK
Quality of the cooling water
pH-value (at 20 °C)
Total hardness
Concentration of chloride
Concentration of sulfate
Concentration of nitrate
Part of dissolved materials
Particle size of contaminations
Conductivity
Cleaning the coolant circuit
Coolant additives
Manufacturers of coolant additives
NOTICE
● For this reason, liquid cooled motors may only be operated as long as
coolant supply is ensured.
● Observe the manufacturer's instructions when designing and operating
cooling aggregates.
● Do not use coolants or cutting materials from machining processes for
cooling.
● If the coolants, additives or cooling lubricants used are too aggressive,
the motors may be damaged to an irreparable degree.
Requirements on the cooling water, especially with regard to the material
compatibility must be adjusted with the manufacturer of coolant aggregates
and the manufacturer of the coolant additives. Basically, the minimum re‐
quirements on the cooling water are shown in the following.
Cooling water quality for motors with internal cooling circuit made of ...
Aluminum pressure casting /
Copper/brass
1.2 ... 1.8 mmol/l
< 40 ppm
< 50 ppm
< 50 µS/cm
Tab. 9-11: Quality of the cooling water
Inspect and clean (purge) the cooling system at regular intervals as specified
in the machine and cooling system manufacturer's maintenance schedule.
Note that the utilization of unsuitable cleaning agents may cause irreversible
damage to the motor cooling system. This type of damages does not lie with‐
in the responsibility of Bosch Rexroth.
NOTICE
● The only liquids or materials allowed to be used for cleaning and motor
cooling are those which do not corrode the motor cooling system or do
not react aggressively to the materials used in our motors.
● Observe the instructions of the manufacturers of the cleaning agent and
the cooling system.
The following table shows several manufacturers of cooling aggregates
9-12, Manufacturers of chemical
manufacturers can be used.
Bosch Rexroth AG
Operating conditions and application notes
Impairment or failure of motor, machine or
cooling system!
steel
6 ... 9
< 50 ppm
< 350 ppm
≤ 100 µm
< 500 µS/cm
Risk of damage to the motor cooling system
by unsuitable cleaning agents! Loss of war‐
ranty!
additives) Of course, other products of other
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Stainless steel
1.2 ... 2.5 mmol/l
< 150 ppm
< 200 ppm
< 2000 µS/cm
(Fig.