Parker Hannifin
Chapter 3 Electrical Installation 45
External DC Link Inductor (Optional) The Aries AR-20xE and AR-30xE drives have two extra terminals that allow
an external DC link inductor to be added if required. To add the DC link
inductor, remove the factory installed shorting link, and connect the inductor
as shown in Figure 18.
Figure 18 External DC Link Inductor Connection
If a drive is supplied from a low-impedance source (for example, a
transformer that has a kVA rating more than 10 times the drive), the input line
currents to the drive can be non-sinusoidal. They may have a peak that is
two to three times the rms value, compared to 1.4 times for a sinusoidal
waveform. This results in higher currents being drawn from the line at rated
power and harmonics that might interfere with other equipment. The addition
of a DC link inductor reduces the severity of these problems.
Table 19 provides compatible DC link inductors for the Aries AR-20xE and
AR-30xE.
Drive Type Recommended
Inductance DC Current Rating
AR-20xE 1.0 to 3.0 mH 10A
AR-30xE 0.75 to 2.0 mH 15A
Note: Where within the recommended range, the larger inductance gives a better
shape to the input current waveform, but at the expense of larger physical size.
Table 19 AR-20xE & AR-30xE DC Link Inductors
Warning — The drive’s connector strip terminals have hazardous voltages
when power is applied to the drive, and up to several minutes after power is
removed. Lower voltages may still be present for several minutes after power
is removed. During normal operation, these high voltage terminals must not
be accessible to the user.