WEG MVW3000 A0040 V023, Руководство пользователя

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MVW3000 | 5-1
5
MVW3000 | 5-1
Synchronous Motor Line
5 SYNCHRONOUS MOTOR LINE
In order to allow driving synchronous motors, the MVW3000 introduces a number of software functions and new
hardware elements for commanding and controlling these motors.
Figure 5.1 on page 5-1 presents the general diagram for driving the synchronous motor using the MVW3000.
For more details on the excitation control system and the direct connection of the motor to the line, refer to the
electrical project of the inverter.
Supply line
Auxiliary line
E
Y Y
- +
MS
Interlocked
AC/DC converter
Excitation
control
system
Crowbar
MVW3000
MVC3
MVC4
RSSI
Figure 5.1: General diagram of the inverter for synchronous motor
5.1 ABSOLUTE ENCODER WITH RSSI BOARD
In synchronous machine drive applications, it is necessary to use an absolute encoder so as to obtain the exact
rotor position in relation to the stator, since the incremental encoder is not able to provide such information.
5.1.1 Absolute Encoder
The synchronous motor control requires the use of an absolute encoder, which must follow the following
specifications:
Synchronous Serial Interface (SSI) communication protocol with RS-485 communication channel, with clock and
16 bit word size in the following format:
14 data bits
1 ZERO bit
1 even parity bit