Parker NX Series, Technical Manual

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13 - PVD 3663_GB_NX_March 2017.Docx
3.1.2.2. Water cooled motor
Typical values are given with a water inlet temperature of 25°C and a temperature
gradient Inlet-Outlet of 10°C. These references lead to a winding overheating of 95°C
corresponding to a winding temperature of 120°C. Recommendations regarding
condensation issues are given at § 3.5
It is possible to increase a little bit the Inlet temperature up to 40°C, but the torque must
be reduced. The following formula gives an indicative of the torque derating at low
speed. But in any case refer to PARKER technical department to know the exact values
At low speed the torque derating is given by the following formula for an water Inlet
temperature > 25°C.
C
C e temperatur Inlet C
derating Torque

  

95
) _ 120 (
* 100 [%] _
At high speed, the calculation is more complex, and the derating is
much more important.
Please refer to PARKER to know the precise data of Torque derating
according to water inlet temperature at high speed for a specific motor.
Illustration:
Only for example given for the NX860WAF
Torque Derating vs. ambiente temperature
90
92
94
96
98
100
102
25 30 35 40
Ambient temperature [°C]
T
o
rq
u
e
d
e
ra
ti
n
g
[
%
]
Torque derating at low speed [%]
Torque derating at high speed [%]
Torque Derating vs cooling temperature
Cooling temperature