19 - PVD 3663_GB_NX_March 2017.Docx
3.1.5.
Current limitation at stall conditions (i.e. speed < 3 rpm)
Recommended reduced current at speed < 3 rpm:
0
0
*
0.7
*
2
1
I
I
I
reduced
Warning: The current must be limited to the prescribed values. If the
nominal torque has to be maintained at stop or low speed (< 3 rpm),
imperatively limit the current to 70% of I
0
(permanent current at low
speed), in order to avoid an excessive overheating of the motor.
Please refer to the drive technical documentation for any further
information and to choose functions to program the drive.
3.1.6.
Peak current limitations
It is possible to use the NX motor with a current higher than the permanent current.
But, to avoid any overheating, the following rules must be respected.
1) The peak currents and peak torques given in the data sheet must never be
exceeded
2) The thermal equivalent torque must be respected (§3.1.3)
3) If 1) and 2) are respected (it can limit the peak current value or duration), the
peak current duration (tp) must be limited, in addition, accordingly to the
following table (Io is the permanent current at low speed):
Ipeak/In
Ip/Io =2
Ip/Io = 3
Ip/Io =4
Ip/Io >5
NX110
tp<0.8 s
tp<0.3s
tp<0.15s
tp<0.1s
NX210
NX310
NX420
NX430
NX620
tp<1.5s
tp<0.6s
tp<0.3s
tp<0.2s
NX630
NX820
NX840
NX860
NX860V
tp<3s
tp<1.5s
not allowed
NX860W
The peak current duration is calculated for a temperature rise of 3°C
Consult us for more demanding applications.
0
1
2
3
4
0
5
10
15
20
25
Peak
c
u
rr
e
n
t/
Low
sp
e
e
d
cu
rr
e
n
t
Time
I/Io
tp
tc
Summary of Contents for NX Series
Page 1: ...1 PVD 3663_GB_NX_March 2017 Docx Servomotors NX Series Technical Manual PVD 3663...
Page 3: ...3 PVD 3663_GB_NX_March 2017 Docx Compliance with UL standards...
Page 4: ...4 PVD 3663_GB_NX_March 2017 Docx Compliance with UL standards...
Page 39: ...39 PVD 3663_GB_NX_March 2017 Docx 3 3 Dimension drawings 3 3 1 NX1...
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Page 72: ...72 PVD 3663_GB_NX_March 2017 Docx 3 5 2 2 NX205 3 5 2 3 NX210...
Page 73: ...73 PVD 3663_GB_NX_March 2017 Docx 3 5 2 4 NX310 3 5 2 5 NX420...
Page 74: ...74 PVD 3663_GB_NX_March 2017 Docx 3 5 2 6 NX430 3 5 2 7 NX620...
Page 75: ...75 PVD 3663_GB_NX_March 2017 Docx 3 5 2 8 NX630 3 5 2 9 NX820...
Page 76: ...76 PVD 3663_GB_NX_March 2017 Docx 3 5 2 10 NX840 3 5 2 11 NX860...
Page 91: ...91 PVD 3663_GB_NX_March 2017 Docx 3 8 4 Mains supply connection diagrams...
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