Line Impedance; Line Reactors; Load Reactors - Baldor ID15J1F50-ER Installation And Operating Manual

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Line Impedance

The Baldor Series 15J control requires a minimum line impedance of 1%. The
input impedance of the power lines can be determined as follows:
%Impedance +

Line Reactors

3 phase line reactors are available from Baldor. The size of the line reactor to
use is based on the maximum continuous load. 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.
L +
Where: L
V
L-L
0.01
I
377
230VAC, 60Hz, 3% Impendance
Catalog No. HP

Load Reactors

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.
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Load reactors should be installed as close to the control as possible.
3-4 Receiving and Installation
If the feeder or branch circuit that provides power to the control has
power factor correction capacitors that are switched on line and off line,
the capacitors must not be switched while the control is connected to the
AC power line. If the capacitors are switched on line while the control is
still connected to the AC power line, additional protection is required.
TVSS (Transient Voltage Surge Suppressor) of the proper rating should
be installed between the AC line reactor or an isolation transformer and
the AC input to the control.
Measure the line to line voltage at no load and at full rated load. Use
these measured values to calculate impedance as follows:
(Volts
(V 0.01)
L*L
(I 3 377)
Minimum inductance in henrys.
Input volts measured line to line.
Desired percentage of input impedance (1% shown).
Input current rating of control.
Constant used with 60Hz power.
Use 314 with 50Hz power.
Table 3-2 Recommended Line Reactors
Amps Inductance
Protect the control from a short circuit at the motor.
Limit the rate of rise of motor surge currents.
Slow the rate of change of power the control delivers to the motor.
* Volts
NoLoad FullLoad
(Volts )
NoLoad
460VAC, 60Hz, 3% Impendance
Catalog No.
(mH)
)
100
HP Amps Inductacne
(mH)
MN715J