Rockwell Automation 1397 DC Drive Firmware 2.xx - Manual (Page 37)

2–19 Installation
Publication 1397-5.0 — June, 2001
line is lower impedance, a line reactor or isolation transformer
must be added upline from the Drive to increase line
impedance. If the line impedance is too low, transient voltage
spikes or interruptions can create excessive current spikes that
will cause nuisance input fuse blowing, and may cause damage
to the Drive power structure. Refer to Figures 2.13 through
2.16 for AC input wiring at the main fuses and the
following ATTENTION note when determining if a line reactor
or isolation transformer is required for your installation.
AC Line Connection – Connect incoming three-phase AC line
power to the AC Line Terminals as shown in Figures 2.13 through
2.16. Note that the incoming AC power is wired to separate
terminals on the 1.5-30HP/3-60HP, 7–110A Drives, but is wired
directly to AC line fuses on 40-75HP/75-150HP,
100-150/200-300HP, 265A and higher and 400 to 600 HP Drives.
The fuses supplied are designed to provide protection against short
circuits for the Drive semiconductors and associated output wiring.
They are not to be considered a substitute for the user supplied motor
branch circuit protective devices that are required by the National
Electrical Code. Refer to Table 2.E for proper sizing of the AC
power and branch fuses.
ATTENTION: If the AC input power system does not
have a neutral or one phase referenced to ground, an
isolation transformer with the neutral of the secondary
grounded is highly recommended. If the line-to-line
voltages on any phase can exceed 125% of the nominal
line-to-line voltage, an isolation transformer with the
neutral of the secondary grounded, is always required.
Failure to observe these precautions could result in
bodily injury or damage to equipment.
!