AC Line / Load Reactors
User Manual
Data subject to change without notice 12 of 32 INSTR-011 REL. 150109 REV.006
See www.mtecorp.com for current data and CAD drawings
PRODUCT SPECIFICATIONS (cont’d)
AUDIBLE NOISE: Guard-AC Line/Load Reactors offer low noise operation. Core and coil
construction, flux density control, harmonic compensation as well as our epoxy impregnation process
assure minimal audible noise radiation. Although our reactors are typically “quiet”, waveforms vary by
drive type and application and therefore reactor audible noise may vary by application. Noise levels may
be affected by type of motor and motor conductor as well as motor conductor length.
Typical audible noise levels for units selected from our catalog by HP rating are:
2 thru 12 amps 55 dBA
18 thru 100 amps 65 dBA
130 thru 400 amps 70 dBA
500 thru 1200 amps 75 dBA
Service Factor: Guard-AC reactors are compensated for the additional currents and high
frequencies caused by the presence of harmonics. The reactor fundamental current rating indicates the
typical full load motor current and is also the basis of impedance rating. Standard reactors rated 1 amps
thru 750 amps offer a full 1.5 service factor rating which allows them to carry overload current up to 150%
of their fundamental rating when applied as an input line reactor. Since the nameplate ratings of motor
drives (ASD) varies widely by manufacturer, this helps to assure that the reactor maximum current rating
is compatible with the nameplate current rating on the ASD. The service factor rating compensates for
ASD manufacturer variances in motor drive current ratings and for harmonic currents. Nominal
inductance is assured all the way up to the service factor current rating.
PWM / IGBT PROTECTION: Guard-AC reactors are protected against the high peak voltage and fast
rise time voltage pulses associated with PWM waveforms. The dielectric strength is 4000 volts rms and
Guard-AC reactors meet the ratings of an inverter duty motor (NEMA MG-1, part 31). For convenience,
they can be located either at the motor or at the drive.
HARMONIC ATTENUATION: Our unique harmonic compensation assures maximum circuit inductance
in the presence of complex waveforms and can be relied upon to minimize input total harmonic current
distortion (THID). Additionally, it offers superior absorption of transient voltage spikes. Our standard
reactors will typically reduce 6-pulse rectifier input current harmonics to the following levels at full load
operating conditions:
3% reactor alone 45% or less THID
5% reactor alone 35% or less THID
3% AC reactor + 3% DC link choke 33% or less THID
5% AC reactor + 3% DC link choke 28% or less THID
(DC link choke inductance is equivalent ac impedance).
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