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10 Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
2.3 SPMD inverter
The SPMD is an inverter stage only (DC in to AC out). If a rectifier is required, then an SPMC or SPMU and AC input line reactor must also be
installed. It can provide a maximum continuous output current of 350A (400V drive). DC connections can be used for regen and bus-parallel
applications. The SPMD is available with or without a braking IGBT fitted.
Figure 2-6 SPMA inverter schematic
2.4 Input line reactor
The INL line reactor must be used in conjunction with the Unidrive
SPMC/U rectifiers. See section 6.2.2 Input line reactor specifications on
page 67 for further information.
Figure 2-7 Single input line reactor (INLX0X)/force cooled (INLX0XW)
Figure 2-8 Dual input line reactor (INLX1X)
This is not an interbridge reactor.
2.5 Output sharing choke
The OTL output sharing choke must be used on the output of Unidrive
SPMA/D when more than one module is paralleled together.
Figure 2-9 Single output sharing choke (OTLX0X)
Figure 2-10 Dual output sharing choke (OTLX1X)
For a physical representation of the input line reactors and output
sharing chokes, see Figure 3-4 on page 21.
L1
L2
L3
L1A
L2A
L3A
L1B
L2B
L3B
Supply
Drive 1
Drive 2
UVW
U1 U2
V1 V2
W1 W2
Drive 1
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