Bosch MSK030B-0900-NN, Project Planning Manual

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Impairment or failure of motor, machine or
cooling system!
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.
Quality of the cooling water 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 ...
Copper/brass
Aluminum pressure casting /
steel
Stainless steel
pH-value (at 20 °C) 6 ... 9
Total hardness 1.2 ... 1.8 mmol/l 1.2 ... 2.5 mmol/l
Concentration of chloride < 40 ppm < 150 ppm
Concentration of sulfate < 50 ppm < 200 ppm
Concentration of nitrate < 50 ppm
Part of dissolved materials < 350 ppm
Particle size of contaminations ≤ 100 µm
Conductivity < 50 µS/cm < 500 µS/cm < 2000 µS/cm
Tab. 9-11: Quality of the cooling water
Cleaning the coolant circuit 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.
Risk of damage to the motor cooling system
by unsuitable cleaning agents! Loss of war‐
ranty!
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.
Coolant additives
Manufacturers of coolant additives The following table shows several manufacturers of cooling aggregates ( Fig.
9-12, Manufacturers of chemical additives ) Of course, other products of other
manufacturers can be used.
DOK-MOTOR*-MSK********-PR12-EN-P Bosch Rexroth AG 231/279
Synchronous Servomotors MSK
Operating conditions and application notes