Parker NX Series, Technical Manual

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80 - PVD 3663_GB_NX_March 2017.Docx
3.6.4. Additives for water as cooling media
Please refer to motor technical data for coolant flow rates.
The water inlet temperature must not exceed
25°C without torque derating.
The water inlet temperature must not be below 5°C.
The inner pressure of the cooling liquid must not exceed
5 bars .
The servomotors are water cooled. Corrosion inhibitors must be added to the water to
avoid the corrosion. The complete cooling system must be taken into account to
choose the right additive, this includes: the different materials in the cooling circuit, the
chiller manufacturer recommendations, the quality of the water…
The right additive solution is under the responsibility of the user. Some additives like
TYFOCOR or GLYSANTIN G48 correctly used have demonstrated their ability to
prevent corrosion in a closed cooling circuit.
For example: Glysantin G48 recommendations are :
- Water hardness: 0 to 20°dH (0
– 3.6 mmol/l)
- Chloride content: max. 100ppm
- Sulphate content: max. 100ppm
Caution: The water quality is very important and must comply with
supplier recommendations. The additive quantity and periodic
replacement must respect the same supplier recommendations.
Select carefully the materials of all the cooling system parts (chiller,
exchanger, hoses, adapters and fittings) because the difference
between material galvanic potential can make corrosion.
Caution: To avoid the appearance of corrosion of the motor cooling
system, the water must have anti-corrosion additive.
Caution: The additive choice must take into account the global
cooling system (chiller or water exchanger recommendations…).