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Safety
Information
Introduction
Product
Information
System
configuration
Mechanical
Installation
Electrical
Installation
Getting
Started
Basic
parameters
Running
the motor
Optimization
SMARTCARD
operation
Onboard
PLC
Advanced
parameters
Technical
Data
Diagnostics
UL Listing
Information
30
Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
Figure 4-6 Layout for two Unidrive SPMD modules with a dual SPMC rectifier operating on a 3-phase AC supply
Master
Slave
OTLXXX
Sharing
chokes
OTLXXX
Sharing
chokes
U
V W
U
V W
+DC -DC
Master/
slave
interface
lead
Rectifier
to inverter
control
wiring
Fuses***
Fuses***
L3
L2
L1
Fuses*
INLX1X
Line reactor**
24Vdc****
24Vdc****
*Refer to Table 6-16, Table 6-17 on
page 74 and Table 6-18 on page 75 for
technical data and part numbers.
**Refer to Table 6-2, Table 6-3, Table 6-4
and Table 6-5 on page 68 for technical
data and part numbers.
***Fuses are needed only if the power
supply has a current rating of more than
10A.
****Refer to section 14.1.3
Supply
requirements
on page 267 for supply
requirements.
Current sharing between drives
whose motor outputs are
connected in parallel
When used from a 3 phase supply, it is
preferable not to link the DC bus because
the impedance between DC and each
inverter output is just the impedance of
the output chokes. Also, on the input
side, input current sharing is determined
only by making the temperature of the
two rectifiers similar and by ensuring that
both rectifiers see the same impedance
to the line power supply.