Siemens EK 726 Series Manual de servicio descargar pdf (Pagina 32)

ENGINEERING INFORMATION AND INSTRUCTIONS

MICROMASTER

MICROMASTER Vector

MIDIMASTER Vector

SIEMENS DA 64 – 2002/2003

Version D 3/8

3.5 Line supply

The drive inverters are designed for limit values defined in the following standards. These standards describe the noise voltages

permissible at the line supply input.

IEC/EN 61000-4-4: Brief voltage spikes/noise pulses: 4 kV

(VDE 0847 Part 4-4)

IEC/EN 61000-4-5: Surge voltages: 4 kV common mode

(VDE 0847 Part 4-5) 2 kV differential mode

IEC/EN 61000-4-11: Voltage dips: 30 % for 60 ms

(VDE 0847 Part 4-11) 10 % for 100 ms

Voltage interruptions: >95 % for 5 s

Voltage fluctuations: V

rated

+/-10 %

IEC/EN 61000-2-4: Level of compatibility for low-frequency, cable-borne noise in industrial systems and plants,

(VDE 0839 Part 2-4) Class 3, 10 % distortion factor (THD)

EN 61000-3-2 Limit values for harmonic currents (drive unit incoming current <= 16 A per phase)

Since the 1

of January 2001, all electrical equipment, where the EMC Directive applies, must be in full

compliance with EN 61000-3-2. (refer to Section 1.3.3)

Line harmonics and line impedance

Line harmonics

When operational, drive inverters cause non-sinusoidal line currents with harmonics. The harmonic currents can be

reduced by additionally using line reactors.

Line impedance

The ratio between the rated drive power / line supply fault level should not fall below 1 %. This means, that when the

drive inverter is operating at full load, the voltage drop across the line impedance should be greater than or equal to

1% of the rated voltage. If the line impedance is below this value (rated drive inverter power / line supply fault level

less than 1%), a line-commutating reactor must be used, as otherwise this could result in a shorter lifetime of the DC

link capacitors.

The power supply company (power utility company) should be contacted regarding the line supply fault level. This may

also be able to be taken from the rating plate of the upstream transformer.

Voltage and current spikes

Furthermore, line-commutating reactors reduce or smooth voltage and current spikes.

(further details are provided in Section 3.14, Line reactors)

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Siemens EK 726 Series Manual de servicio Pagina 32