Micro Series compact inverters
offer "big drive" features for adapting standard
or premium efficiency three phase motors to adjustable speed
operation. Utilizing the latest micro-processor and advanced
IGBT power conversion devices, these high performance controls
program and read-out in plain English, eliminating the frustration
and time involved in looking up confusing coded symbols.
rugged steel enclosures for NEMA 1 (IP31), or NEMA 4/12
(IP65) service do not require additional enclosure protection
as with many plastic housed compact drives. Built-in thermal
overload protection reduces additional costs. Heavy duty
wiring terminals accessible via three conduit openings on
the bottom of the housing for power in/out and input/output
signals speeds installation and reduces installation costs.
SPEEDMASTER® Adjustable Speed AC & DC
Series AC Inverters
thru 60 HP
Plus Sub-Micro AC Inverters
thru 10 HP
thru 3 HP
thru 2 HP
Pulse Width Modulated Controls
thru 1/4 HP
more information, see the following literature:
three-phase AC reactors are intended for use as input
(or output) filters for variable frequency drives. Drive performance
is improved by protecting the input rectifier from failure
or damage and acting as a buffer between the line and the
solid state power circuit.
voltages on the AC power line can cause inrush currents to
an AC drive. These transient voltage conditions are often
caused by utility capacitor switching. The addition of a line
reactor will limit the magnitude of inrush current preventing
tips and component failures.
Two Rating Levels, Two Choices, One "Optimized"
Answer: the new KDR
These units are
used between the line and drive. The KDR Optimized Drive
Reactors come in two ratings; Low "2" (low impedance)
and High "2" (high impedance). Input impedance can
significantly improve drive performance; however, it should
be noted that as impedance increases, the DC voltage one
VFD's capacitors actually decreases. This decrease can become
significant enough to cause either an undervoltage trip or
excessive motor current in the VFD. The KDR Optimized Drive
Reactors have been designed to provide the best protection
for both your drive and your application.
thru 350 HP
High (Z) Impedance
thru 350 HP
DRIVE REACTORS KDR Optimized Drive Reactors are used
between the output of AC-PWM variable frequency drives and
the motor, where the motor lead lengths are less than 100
addition of a KDR unit to the output of a drive will dampen
overshoot peak voltage, reduce motor heating and audible noise,
helping to extend the life of the motor. The units also help
prevent inverter instantaneous overcurrent trips because they
provide needed inductance when the load on an inverter has
an abnormally high capacitance.
100 foot guideline has been
recommended because as motor leads become longer, the resonant
frequency is lowered, and the magnitude and duration of the
voltage spikes increases. Even though the addition of a KDR
can be beneficial, the addition of a reactor may be ineffective
and potentially detrimental to system performance where motor
lead lengths exceed 100 feet.