US drives AC Regen, Instruction Manual, Page: 9 / 20

AC REGEN 7
AC REGEN
Emissions
Care must be used in the routing of power and ground
connections to the
AC REGEN to avoid interference
with sensitive equipment that may be nearby. The
cable from the drive to the
AC REGEN carries switched
voltages and should be routed well clear of sensitive
equipment. The ground conductor of the motor cable
should be connected to the drive ground stud directly.
Connecting this ground conductor to a cabinet ground
point or ground bus bar may cause high frequency
current to circulate in the ground system of
AC REGEN
enclosure.
GROUNDING
Refer to the “Recommended Power Wiring” diagram in
figure 3 for grounding instructions. The
AC REGEN
must be connected to AC system ground using the
power ground stud(s) provided. Ground
impedance must conform to requirements of national
and local industrial codes (NEC, VDE 0160, BSI, etc.)
and should be inspected and tested at regular
intervals.
These ground wires must have a
current rating in compliance with the above
mentioned national and local codes
.
Note that the
AC REGEN signal common
(COM)
should not be connected to the power ground stud
directly. If desired, one of these commons may be
connected to earth ground at a single point outside
the drive enclosure.
For multiple
AC REGEN systems, if the signal common
on each AC REGEN is to be grounded, they can be
“daisy-chained” connected, using a single COM point
on each
AC REGEN. Note that this AC REGEN
COM
“bus” should only tie to earth ground at only one
point.
Grounding Sensitive Circuits
It is critical to control the paths through which high
frequency ground currents flow. Sensitive circuits
should not share a path with such currents. Control
and signal conductors should not be run near or
parallel to power conductors.
Power Cabling
Input and Output power connections are made
through the power terminal block and power ground
stud. The actual
AC REGEN label markings are shown
in Table 4. Maximum torque values for terminal
connections are also indicated on labels next to the
connection points.
Table 4
Power Signal Description
Terminal Description
GND Power Earth Ground Stud
L1 L2 L3
AC LINE INPUT AC Line Input Terminals
DC- DC+ DC Bus Terminals
Control and Signal Wiring
Terminal blocks TB1 and TB2 on the AC REGEN main
control board are used for connecting control and
signal wiring. See Figure 4 for terminal block physical
location A brief summary of the terminal block
assignments are shown in Table 5.
Before proceeding with any signal wiring, the
following precautions for the signal conduit and wire
must be followed:
Signal Conduit Requirements

Use either rigid steel or flexible armored steel
cable.

The signal conduit must cross non-signal conduit
at an angle of between 45

and 90

.

Do not route the conduit through junction or
terminal boxes that have non-signal wiring.
Signal Wire Requirements

Size and install all wiring in conformance with the
requirements of national and local industrial safety
regulations (NEC, VDE 0160, BSI, etc.)

Use shielded wire for signal wire connections.

Route all signal wiring away from high current
lines such as AC lines.
Always run the signal wire in steel conduit. Never run
the signal wire with non-signal wire.