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MOTORCABLE
LENGTH
In many VFD-motor applications,
installation requirements dictate
the physical separation of the VFD
and motor. depending on the distance
of separation, fast changing PWM
voltage pulses from the VFD can
interact with the distributed inductance
and capacitance of the motor leads,
producing peak motor terminal voltages
in excess of 1600 volts. This is
generally referred to as "long-lead
effects" and typically impacts
VFD-motor installations with lead
lengths of 50 feet or greater. This
high voltage condition can stress
and degrade the motor insulation
resulting in premature cable or
motor failures.NELCO's special IGBT
firing algorithm helps to safely
minimize long-lead effect for most
applications with cable runs up
to 300 feet for 400 volt and above
systems and up to 50 feet for 575
volt and above systems.
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SPEEDREGULATION
The GT3000 provides standard frequency
regulation setpoint accuracy of 0.1%.Adding
a closed-loop encoder will result in a
speed regulation of 0.1%. The GT3000 offers
Torque Follower Control for Master-slave
applications.
PROTOPS™RELIABILITY
(Process
Tolerant Protection Strategy) allows the
user to configure alarms to ensure the
process will remain up and running. Alarms
such as Overspeed, Overcurrent, Network
Failure and Underload are just a few of
the ProToPS™ alarms that make the
unexpected expected.
OVERLOAD
PROTECTION
Using a simulated I2T curve in the drive
software, the GT3000 offers outstanding
motor protection.
FLYING
RESTART
By continuously monitoring the motor's
speed and direction, the GT3000 can instantaneously
start or restart into a spinning motor.
In the event of power interruption, the
GT3000's standard sensorless vector control
tracks the motor. When power is restored,
the GT3000 immediately powers the motor
without delay.
ENERGY
SAVER
The GT3000 Energy Saver feature dramatically
improves the system efficiency at light
loads (5Hz to 25Hz) by operating the motor
at optimal flux, thus minimizing motor
losses by regulating and optimizing the
motor's power factor.
AUTO-TUNING
When using sensorless vector control,
the GT3000 provides an auto-tuning feature.This
promotes simpler, quicker start-ups to
get your plant process up and running.
MULTIPLE
ss CAPABILITY
One VFD can control multiple motors for
special applications by using an optional
volts/hertz control.
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