Parker EY Series - Voltage Withstand Characteristics of EY Series

35 – Pvd3675_Gb_Ey_Septembre_2017
3.2.10. Voltage withstand characteristics of EY 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 EY 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 EY motors.
Note: The pulse rise times are defined in accordance with standards IEC/TS 60034-17
ed4.0 2006-05-09.
The EY motors can be used with a supply voltage up to 400 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
EY 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)
Peak Voltage (kV)
Curve EY motors
Curve IEC 60034-25: <690V AC
Curve IEC 60034-25: <500V AC
Curve IEC 60034-17: <500V AC