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38 - PVD 3663_GB_NX_March 2017.Docx
3.2.10. Voltage withstand characteristics of NX series
The motors fed by converters are subject to higher stresses than in case of sinusoidal
power supply. The combination of fast switching inverters with cables will cause
overvoltage due to the transmission line effects. The peak voltage is determined by the
voltage supply, the length of the cables and the voltage rise time. As an example, with
a rise time of 200 ns and a 30 m (100 ft) cable, the voltage at the motor terminals is
twice the inverter voltage.
The insulation system of the servomotors NX is designed to withstand high repetitive
pulse voltages and largely exceeds the recommendations of the IEC/TS 60034-25 ed
2.0 2007-03-12 for motors without filters up to 500V AC (See figure 1).
Figure 1: Minimum Voltage withstands characteristics for motors insulations according
to IEC standards. At the top are the typical capabilities for the NX motors.
Note: The pulse rise times are defined in accordance with the IEC/TS 60034-17 ed4.0
2006-05-09.
The NX motors can be used with a supply voltage up to 500 V under the following
conditions:

The pulse rise times must be longer than 50 ns.

The repetitive pulse voltages must not exceed the values given in figure 1,
“
Curve NX motors
” in dark blue.
MOTOR PULSE WITHSTAND
CHARACTERISTIC CURVES
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
0 0.2 0.4 0.6 0.8 1 1.2
Voltage Pulse Rise Time (µs)
Pe
a
k
Vo
lt
a
ge
(
k
V)
Curve NX motors
Curve IEC 60034-25: <690V AC
Curve IEC 60034-25: <500V AC
Curve IEC 60034-17: <500V AC