Line Reactors; Load Reactors - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

Line Reactors

Load Reactors

MN718
Three phase line reactors are available from Baldor. The line reactor to order is based on
the *Quad Rated HP of the control. If providing your own line reactor, use the following
formula to calculate the minimum inductance required. Table 3-3 lists the input current
required for this calculation, for each control size.
(V
L +
(I
Where:
L Minimum inductance in Henries.
V Input volts measured line to line.
L–L
0.03 Desired percentage of input impedance.
I Input current rating of control.
377 Constant used with 60Hz power.
Use 314 if input power is 50Hz.
Line reactors may be used at the control output to the motor. When used this way, they
are called Load Reactors. Load reactors serve several functions that include:
Protect the control from a short circuit at the motor.
Limit the rate of rise of motor surge currents.
Slowing the rate of change of power the control delivers to the motor.
Load reactors should be installed as close to the control as possible. Selection should be
based on the motor nameplate FLA value.
*Quad Rated HP of the control refers to the four (4) different HP ratings of the control that
are based on operating in Standard (2.5KHz PWM) or Quiet (8.0KHz PWM) in either
Constant Torque or Variable Torque. The ratings are provided in Section 7 of this
manual.
0.03)
L*L
3 377)
Receiving & Installation 3-7