Emerson Control Techniques Focus 3N, Руководство пользователя

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Introduction
This is the User’s Guide for Focus 3N (Non-regenerative) series of DC Drives. The Focus
3 is a 3rd generation product of the long-standing Focus series. The Focus 1 was introduced
back in 1980 and the Focus 2 later in 1982. The Focus 2 was retired when the Focus 3 was
introduced as it took advantage of many technological advances in power electronics. The
Focus 3 Non-regen is a single-phase, uni-directional analog drive for DC motors with power
ranges from ¼ to 5HP.
Your Focus 3N is a general purpose non-regenerative DC motor speed controller that is
powered from either 115Vac or 230Vac single phase power. A non-regenerative (single
quadrant) drive is one that can provide motoring torque for acceleration and to overcome rated
loads. There are a great many applications where non-regenerative drives provide the most
economical solution. A non-regenerative drive however cannot slow down a motor faster than
the motors normal coasting rate (unless a Dynamic Braking stop is commanded) nor can it stop
overhauling load situations. For more demanding applications, a sister drive- the Focus 3
Regen (regenerative model), offers full four quadrant operation for bi-directional motor control
and controlled deceleration as well as opposition to overhauling loads.
Both drives incorporate many features that are standard on high performance system
drives, such as dynamic stability and built-in signal follower adjustments. Focus 3 drives come
in two basic model variations- with and without enclosure
.
Chassis Model
The model without an enclosure is denoted as a chassis model.
The chassis model is intended for mounting within a User
supplied cabinet and where the User intends to provide remote
Start/Stop and Speed control signals.
Enclosed Model
The Enclosed version comes to you already in a NEMA 4/12
enclosure that would allow the User to mount the Focus on a wall
or machine surface. The Enclosed version has Start/Stop and the
Speed Control adjustment on the front cover for convenient
operation.
For a complete overview of the Focus 3 product
line and available options, visit our website at:
www.emersonct.com or click the link below:
Focus 3 Catalog Section
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