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How to Choose a Mode of
Operation
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Line Regeneration Package Overview
The Regenerative Brake Mode
In the Regenerative Brake Mode, the 1336 REGEN Line
Regeneration Package removes energy from the DC bus of a
standard 1336 AC drive back to the utility.
1. When the connected AC drive is motoring, it receives energy
directly from the three-phase AC line through its input terminals
and diode bridge.
2. When the connected AC drive is regenerating, energy flows
from the DC bus back to the three-phase utility through the
1336 REGEN Line Regeneration Package.
Precharge of the DC bus is accomplished simultaneously through
the 1336 REGEN Precharge Unit and the precharge circuit of the
1336 AC drive. In the Regenerative Brake Mode, the 1336
REGEN Line Regeneration Package is not required to supply
motoring current to the AC drive. Because of this, the 1336
REGEN Line Regeneration Package can be sized to provide
whatever braking capability is needed by the application,
independent of the total HP needed for motoring.
In the Regenerative Brake Mode, the 1336 REGEN Line
Regeneration Package switches synchronously with the AC line
voltage, but does not attempt to create sinusoidal input AC line
currents with a PWM scheme. The resulting power factor is near
unity. The AC line current harmonic spectrum resulting from the
combination of an AC drive and a 1336 REGEN Line
Regeneration Package operating in the Regenerative Brake Mode
is nearly equal to that of a standard 1336 AC drive that is
motoring.
Important: Refer to Chapter 3 for 1336 REGEN Regeneration
Brake applications including Installation, Setup and
Programming information.
Which 1336 REGEN Operating Mode is For Your Application?
Application Requirements
Low Current Harmonics
Multiple Drive Applications
High Power Factor
Equal Braking and Motoring HP
Less Braking Than Motoring HP
Single Drive Application
Intermittent Braking or Low Braking Duty Cycle
The Regenerative Bus Supply Mode can also be used for these applications, but will result in a
more complex hardware configuration and a higher total system cost. Regenerative Bus Supply
operation requires a custom Bulletin 1321 10% line reactor, while Regenerative Brake operation
requires a standard Bulletin 1321 3% line reactor. The mode of operation is selected by a parameter
setting parameter 1 in the 1336 REGEN Converter. Refer to the Programming sections in Chapters
2 and 3 for additional details
Regen
Regen
DC Bus Supply Mode
Brake Mode
X
X
X
X
X
X
X
1–3
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