Specification T1689 Technical Manual Rev 07
Reactors, Inductors & Transformers MV3000 Air Cooled DELTA
Page 66
2.13.7 Input Reactor For AEM Drives
The input reactor provides the impedance between the a.c. supply and the PWM generated voltage of the
network bridge. This impedance is required to allow the network bridge to provide the correct voltage vector
output that will generate a sinusoidal current with a very low harmonic content to the supply voltage.
2.13.8 Shunt PWM Filter For AEM Drives
The PWM filter provides the correct shunt path to attenuate the PWM harmonics generated by the transistor
bridge. These filters are tuned to the switching frequency of the network bridge, with a combination of
resistance, capacitance and inductance.
2.13.9 AEM & Machine Bridge Sharing Reactors
To allow equal load sharing between DELTA transistor modules which are connected in parallel, it is always
necessary to fit additional reactance in the three-phase connection of each parallel module. Two variants are
available, a low power type for use with the MVD300 products and a high power type for use with the
MVD500. Dimensioned drawings of these reactors are included in
Figure 2–25. – Low power sharing reactor 31V5500/10
for fitting under MVD300 DELTA in air cooling path
Figure 2–26. – High power sharing rector 50Z0126/01 for
stand alone placement
2.13.9.1 31V5500/10 Sharing Reactor Features
• Designed to fit directly below a DELTA module and is ventilated by the DELTA cooling system
• Allows airflow to be in one of two directions (underside or rear), a blanking plate is provided to
cover the unused aperture.
• Able to be used as a transistor bridge sharing or output reactor, or as an input reactor for the
rectifier bridge (application and power rating dependant).
• Attaches to the standard DELTA cross rails, directly below the module to which it is connected.
• Suitable for ‘dirty air’ applications through sealing the rear face to a suitable opening in the
cubicle rear sheet and blanking off the underside face.
• Units available to complement both voltage ratings of DELTA modules, 380-525V and 575-690V
a.c.
2.13.9.2 31V5500/10 Interface
• Bolts directly below the module to which it is connected, and is supported by the DELTA cross
rails from pre-drilled fixings.
• Electrical connections are by two sets of terminals, one through stud terminals located on the
front face of the module and the other by busbar connection on the underside of the reactor.
• The electrical connections are not polarity sensitive, meaning either set of terminals may be used
as input or output connections.
• Air entry is through either the back or underside of the module.
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