Kollmorgen Digital MMC Control, Hardware Manual

Page: 46 / 322

44 Kollmorgen - December 2011
MMC Smart Drive Hardware Manual
-
SYSTEM POWER DEVICES
4.3 Line Reactors
AC Line Reactors are required when using some models of the MMC Smart Drive.
They protect the drive from impermissible rates of current change and reduce
harmonic current distortions. When required, they are mounted between the drive and
the mains input power source.
Figure 4-1: Line Reactor Connection (Simplified)
Line reactors are not necessary for the 230V MMC Smart Drives or the 460V size 1
and 2 MMC Smart Drives. Line reactors are required for the 460V size 3 and size 4
MMC Smart Drives.
NOTE
Multiple drives or inverters on a common power line require one reactor per
drive. Individual reactors provide filtering between each drive (and thereby
reduce crosstalk) and also provide optimum surge protection for each unit. A
single reactor serving several drives does not provide adequate protection,
filtering or harmonic reduction when the system is partially loaded. Refer to
Figure 4-1 for an example of one line reactor connected to one drive.
WARNING
The frame of line/load reactors must be grounded at one of the reactor
mounting holes typically by using a star washer under the heads of the
mounting bolts. INJURY OR DEATH MAY RESULT IF THESE SAFETY
PRECAUTIONS ARE NOT OBSERVED.
Danger Electric
Shock Risk
MOTOR
C1 C2
B1
B2
A1
A2
MMC SMART DRIVE
LINE REACTOR SCPD
L1 L2 L3