AGy-EV Instruction manual Chapter 2 - General • 11
Chapter 2 - General
SieiDrive - AGy-EV is an AC Digital Inverters for the variation of the speed of three-phase motors. The AGy can be supplied
with a power range from 0.75kW up to 200kW (230V...480V) and from 2Hp up to 200Hp (575V).
An intermediate voltage is generated from the rectified AC voltage. The Inverter bridge then produces, from this intermediate
voltage, power supply with variable voltage and frequency, by means of sinusoidal evaluated pulse-width modulation. This
power supply provides motors with excellent running characteristics, even in a lower range.
The power supply voltage of the various cards is obtained through a switching from the intermediate circuit voltage.
The inverter power part is based on IGBT component (Insulated Gate Bipolar Transistor). The output is protected against
short-circuits and earth faults. It is possible to switch motors on and off during the Inverter operation (see chapter 5.2.3)
If AC motors that are not specially manufactured to operate with an inverter are used, a reduction of 5...10% in supplied
current must be taken into account. In case that the rated torque is requested even in the low frequency range, further
reductions of the heat will be obtained by an external fan. If no assisted ventilation is available, oversizing of the power of
the motor will be necessary. In both cases we suggest to consult the motor manufacturer.
For mechanical reasons (bearings, unbalanced mass, etc.) the motor manufacturer should be consulted when the motor
is operated above the rated frequency.
AGy Inverters can be controlled in different ways:
- via terminal strip on the drive
- via an operator keypad
- via a standard PC program through RS 485 interface
SieiDrive - AGy-EV allows a smooth open-loop control and by using EXP-ENC-AGY option closed-loop control. With
closed-loop control, an encoder (a pulse generator) provides speed feedback information.
The power section and the control electronics are galvanically isolated.
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