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Extremely compact multidrive series from ABB, the ACS800, offers an array of benefits to integrators, OEMs,
panel builders and end users who are optimizing energy usage through precise control of Motors. Since drives are available both in
multidrive and single drive configurations, it is useful to define the difference, and profile the benefits that the next
generation of multidrives now provides to users.
A Single ABB Industrial Drive
Adjustable Speed Drives are used in any application in
which there is mechanical equipment powered by motors; the drives provide extremely precise electrical motor control, so that
motor speeds can be ramped up and down, and maintained, at speeds required; doing so utilizes only the energy required, rather
than having a motor run at constant (fixed) speed and utilizing an excess of energy. Since motors consume a majority of the
energy produced, the control of motors, based on demands of loads, increases in importance, as energy supplies become ever more
strained. Additionally, end users of motors can realize 25% to 70% energy savings via use of Motor Controllers. (Despite these
benefits, the majority of motors continue to be operated without drives.)
Single ABB industrial drives are highly flexible AC drives that can be customized to meet the precise needs of
a single-motor application. These units convert AC power to DC, and then invert the DC back to an AC output to a motor. These
ABB ACS800 Drives cover a wide, full range of powers and voltages. Single industrial
drives also feature a wide range of built-in options as standard equipment. They can be installed for most applications right out
of the box; and they also can be ordered and manufactured as a customized unit for a particular application.
Figure 1. Key units of the new ABB ACS800 Multidrive System
If you are looking for ABB ACS800 Drives, please call us on
(800) 894 - 0412 or email us at
info@clrwtr.com we
will do our best to help you find the ABB ACS800 High Performance Industrial Inverters that you are looking for at the lowest
prices possible. If you are searching for ABB ACS800 VFD Drive technical information (data-sheets) please use the
ABB Drives Data Sheets OR
Product Selection Guide page links.
What Is An ABB Multidrive?
A multidrive is built from industrial drive modules that are connected to a common DC bus bar. The common bus bar is used to
supply the drive modules with DC power, and each module then inverts the DC to AC and powers an individual motor. The DC power is
derived from a single supply unit (rectifier) that is built into the front end of the same multidrive configuration. This
construction simplifies the total installation and results in many benefits: savings in cabling; reduced line currents and
simpler braking arrangements; energy distribution over the common DC bus bar, which can be used for motor-to-motor braking without
the need for a braking chopper or a regenerative supply unit; reduced component counts; increased reliability; and space savings;
and there is no need for a separate Motor Control Center (MCC).
Where Can Multidrives Be Used?
In general terms, the ABB multidrives can be used whenever several drives/motors form part of a single or integrated mechanical
process. The common supply of the multidrive enables the implementation of overall safety and control functions, and permits the
close coordination of individual drive motors. For example, a paper machine has many motors that must be individually controlled
as a complete system. The ABB Multidrives offer fast communication of torque and speed signals between the drives, to control the
tension in the paper web. Multidrives also can be used where the shafts of the individual drive motors are not tightly coupled;
for example, in processes where each drive module can be programmed with a speed profile so that the overall use of the energy is
minimized. These two examples merely demonstrate the range of applications where ABB Multidrives offer substantial benefits over
other types of drive contructions.
ABB Multidrive Promises
Modular configuration of multidrives provides control of multiple motors across a 1HP to 700HP power range, from 380VAC to 600 (690)
VAC. A single rectifier unit can be combined with a host of inverter units that are connected in parallel, to provide output
current required by any given application. Additional major benefits include:
Encoderless Motor Operation: Superior dynamic-response performance of ABB's patented Direct Torque Control (DTC) motor
control algorithm. Many applications can be run without Encoder feedback. Flexibility: Only four types of diode rectifiers are used to invert AC three-phase input power to the
common DC bus bar across the entire ACS800 power range (200HP to 4600HP). Inverter modules (drives) are available in seven sizes
(R2i to R8i frame sizes) and cover the 1HP to 700HP range; single R8i units, or R8i units in parallel, supply the motors. Compact Design: Improvements in technology and power components have reduced the total footprint of
these multidrives by upto 50%, compared to the generation of multidrives preceding the ACS800 line. This frees up significant
wall, panel, and floor space. Wide Range Of Options: I/O Extensions, field buses and a pulse encoder module all fit inside the
inverters. Adaptive Programming: This program extends the freely programmable I/O and extensive parameter
selections built into the multidrive and access via the Start-up assistant. The Adaptive Programming accesses extensive parameter
selections for complete flexibility in precise control of all individual motors; like a mini
ABB PLC built in. Reduced Installation Costs: Since the modular configuration utilizes a common DC bus, the cabling
input power required is a single three-phase AC connection. Further, the cabling is wired to the rectifier module through a
unique plug-in connector, which then powers the entire common DC lineup. And the plug-in connectors for the inverters (132kW and up)
are wired to the motor terminals. Both the rectifiers and the inverters are rolled in on their wheels and seated into the
Connectors. Redundancy: Common spare parts and ability to keep running at reduced load, if module is disabled.
Overview Of The Construction
An ABB multidrive is built from several different sections (See Figure 1). The key units within these multidrive systems include:
Drive Units: Inverters have built-in Capacitors for smoothing the voltage of DC bus bars. Diode Supply Units (DSU): These units automatically adapt to 6 or 12 pulse operation, and during
start-up, they deploy a built-in control system that automatically charge the inverters' capacitor banks. IGBT Supply Units (ISU): Used in regenerative drive systems and applications requiring low Harmonics,
to convert three-phase AC voltage to DC voltage. Thyristor Supply Units (TSU): In a regenerative drive, can regenerate power back to the mains. Dynamic Braking Units: In resistor braking, whenever the DC bus voltage of a frequency converter
exceeds a certain limit, a braking chopper connects the circuit to a braking resistor. Control Units (Optional): Are equipped with communication interfaces, Power Supplies, etc. for
automation equipment.
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