Parker NX Series, Technical Manual

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12 - PVD 3663_GB_NX_March 2017.Docx
3.
TECHNICAL DATA
3.1. Motor selection
3.1.1. Altitude derating
From 0 to 1000 m : no derating
1000 to 4000 m: torque derating of 5% for each step of 1000 m for water cooled
1000 to 4000 m: torque derating of 10% for each step of 1000 m for air cooled
3.1.2. Temperature derating
3.1.2.1. Natural cooled motor
The maximal temperature for natural cooling is 40°C. But, it is possible to increase a
little bit the ambient temperature above 40°C, with a torque reduction. The following
formula gives an indicative about 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 ambient
temperature > 40°C.
C
C e temperatur Ambient C
derating Torque

  

105
) _ 145 (
* 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 ambient temperature at high speed for a specific motor.
Illustration:
Only for example given for the NX620EAR :
Torque Derating vs. ambient temperature
75
80
85
90
95
100
105
25 30 35 40 45 50 55 60
Ambient temperature [°C]
T
o
rq
u
e
d
e
ra
ti
n
g
[
%
]
Torque derating at low speed [%]
Torque derating at high speed [%]