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6.6 High-Speed Serial Communication-Capable Terminal
Block OPC-VG1-TBSI
6.6.1 Product overview
6.6.1.1 Multiplex system
Connecting two or more FRENIC-VG inverters equipped with a high-speed serial
communication-capable terminal block via optical fiber cables configures a multiple inverter system
(multiplex connection) that makes it possible to drive large-capacity motors.
The maximum capacity of the FRENIC-VG unit is 630 kW. To drive a 1200 kW motor, connect three
400 kW inverters or two 630 kW ones.
Multiwinding motor drive (o33 = 1)
(1) Overview
This optional terminal block enables the FRENIC-VG to drive an induction motor (hereafter referred to as
"motor") with 2 to 6 windings (hereafter referred to as "multiwinding").
The command to specify how much current each winding of the motor should bear is given in a moment
from the master inverter to each slave inverter, via the high-speed serial communications link (optical
link) using the optical fiber cable. Each inverter controls the current of each winding, enabling a
multiwinding motor.
(2) Wiring saving
Like the standard models, the master inverter issues run and speed commands to the motor and connects
the motor encoder for feedback (not required for sensorless control). The slave inverter does not require
signal connection for run and speed commands.
(3) Switching between multiwinding motor drive and single-winding motor* drive
*Single-winding motor: Standard motor, etc.
After driving a multiwinding motor, the individual inverters can switch to a single-winding motor drive
with a digital input signal. At the same time, the motor parameters to be used can be switched with the
digital input signal.
Note that, if the PG or NTC signal is used, switch these signals externally (Separate option:
MCA-VG1-CPG). For switching the secondary power lines, use an electromagnetic contactor (MC).
Direct parallel connection control system (o33 = 2)
(1) Overview
This optional terminal block enables this control system in which two or more inverters are connected in
parallel to drive a single motor. The voltage command and current detection information are transferred in
a moment from the slave inverters connected in parallel, via the high-speed serial communications link
(optical link) using the optical fiber cable.
The master inverter carries out the current control (feedback control) for slave inverters, enabling motor
drive in parallel connection.
(2) Features
c
Multiplexing two or more inverters of small capacity makes it easier to recover from failures or
replace inverters than the system configured with a single inverter of large capacity.
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