Ch.341
——— Inspection procedure, component identification and standard specification ———
3.2. COMPONENT IDENTIFICATION
An AVy Drive converts the constant voltage and frequency of a three-phase power supply into a direct
voltage and then converts this direct voltage into a new three-phase power supply with a variable voltage
and frequency. This variable three-phase power supply can be used for the infinitely variable adjustment of
the speed of three-phase asynchronous motors.
Figure 3.2.1: Basic Setup of Frequency Inverter
1 AC Input supply voltage
2 AC Mains choke (see section 5.7.1)
3 Three-phase rectifier bridge Converts the alternating current into direct current using a
three phase full wave bridge.
4 DC intermediate circuit With charging resistor and smoothing capacitor.
Direct voltage (U
DC
) = √2 x Mains voltage (U
LN
)
5 IGBT inverter Converts direct voltage to a variable three-phase alternating
voltage with variable frequency.
6 Configurable control section Modules for open-loop and closed-loop control of the
power section. This is used for processing control
commands, reference values and actual values.
7 Output voltage: Three-phase, variable alternating voltage.
8 Encoder For speed feedback (see section 4.4.2).
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