Quantum SNC 4500 Manual de usuario descargar pdf (Pagina 20)

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Line and Load Reactors

LR = Line Reactor

L = Low Impedance

M= Medium Impedance

H = High Impedance

Order Code

Current Rating

C = Open Chassis

E = Enclosed NEMA 1

xx - x - xxxxA - x

Line and Load Reactors

Line reactors (sometimes called “line chokes”) are a

common power accessory for electronic variable speed

drives. These components add an extra margin of protection

for AC and DC drives from supply transients.

Line reactors are strongly recommended for installation with

AC drives that do not have built-in inductors. Refer to the

built-in inductor columns in the following tables.

Load reactors are used on the output of AC drives to reduce

the effects of high motor wiring capacitance and to “soften”

the dV/dt (rate of change of voltage) applied to the motor

windings.

Reactors in AC drive applications:

• Help reduce harmonic distortion of the input line current

• Improve input line current balance

• Reduce nuisance drive over-voltage trips caused by

transient voltage spikes and power line notches

• Protect input rectiers from in-rush current caused by

sudden power line surges and sags

• Extend the life of the DC bus capacitor bank by reducing

the internal heating caused by ripple current

• Protect motor windings from long lead effects when used

on the drive output

Line Reactors in DC drive applications:

• Minimize crosstalk between multiple SCR drives by

reducing line notching and subsequent dV/dt misring

and/or bridge failures

• Eliminate SCR failures caused by high dV/dt levels

associated with stiff or power factor corrected power lines

• Protect other line-powered sensitive electronic

equipment by ltering electrical noise and/or interference

caused by drives on the power line

Speciﬁcations

Voltage 690Vac maximum

Ambient Temperature 104 °F (40 °C)

Overload 200% for 10 seconds

150% for 1 minute

Approvals CE

UL508

CSA C22.2

A = Line Reactor

Blank = Load Reactor

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 35 36

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