Emerson Control Techniques Focus 3N, Руководство пользователя

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Page 9
PERFORMANCE FEATURES
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Solid State Full Wave Power Bridge -Uses generously rated power semiconductors for
Maximum reliability and long life.
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Inner Current Loop Regulator - Inherent high bandwidth capability for fast response.
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Semiconductor Fusing - Both AC lines fused for maximum protection in case of short
circuit.
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AC Line Filter and Transient Voltage Suppressor Network - Eliminates interaction
between other drives or AC equipment.
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Current Limit Ranges - Selectable current limit ranges to match the drive to the motor
being used. Provides smooth acceleration of high inertia loads.
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Speed Regulator - 1 % accuracy armature voltage feedback with IR compensation or 0.5 %
accuracy with DC tachometer feedback. Regulation accuracy may be affected by the
tachometer selected.
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Current (Torque) Regulator -
2% accuracy armature current regulator allows the user to control motor torque instead of
speed.
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Circuit Board Indicators - Light emitting diodes (LEDs) on the control board indicate when
the drive is in Run Mode or the Current Limit is enabled.
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Remote Current Limit - Available by the simple addition of a potentiometer.
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Current Signal Follower lnput* - Allows the motor speed to be controlled by a current
signal from a commercially available transducer. The signal may be one of the following:
1 -5mA or 4-20mA
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Voltage Signal Follower lnput* - Allows the motor speed to be controlled by a voltage
signal from a DC tachometer generator or a process voltage signal. It accepts an input with
a range of 0-200 Vdc.
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Auto/Manual Operation - Standard circuitry allows the drive to be controlled by the
operator speed potentiometer or by the current/voltage signal inputs.
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UL/cUL - All Focus 3 Drives are UL/cUL listed.
*Use voltage or current input
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The current/voltage signal must be ungrounded and isolated from the AC power
source and other controls which use the signal. If the signal is not isolated, an
isolator (such as #F3NSBD ) must be used or drive damage will occur.
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One cannot make a connection to ground or a grounded device to any terminal or
connection point to the Focus 3 Non-Regenerative Drive without causing drive
damage. Such failures unfortunately cannot be warranted.
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See Ways of Achieving Isolation on page 69 of this manual