Rockwell Automation 1336 8A-48A Fiber Industry - Manual (Page 37)

2–29 Installation/Wiring
Drive Output Disconnection
!
ATTENTION: Any disconnecting means wired to
drive output terminals U, V & W must be capable of
disabling the drive if opened during drive operation. If
opened during operation, the drive will continue to pro-
duce output voltage between U, V, W. An auxiliary con-
tact must be used to simultaneously disable the drive.
Common Mode Cores
Common Mode Cores will help reduce the common mode noise at
the drive output and guard against interference with other electrical
equipment (programmable controllers, sensors, analog circuits, etc.).
In addition, reducing the PWM carrier frequency will reduce the
effects and lower the risk of common mode noise interference. Refer
to the table below.
Table 2.G
1336 PLUS Common Mode Chokes
Catalog Number Used with . . . Description
1321-M001 Communications Cables, Analog
Signal Cables, etc. Open Style - Signal
Level
1321-M009 All 1336 PLUS Drives Rated:
480V, 0.37-3.7 kW (0.5-5 HP) Open Style with
Terminal Block, 9A
1321-M048 All 1336 PLUS Drives Rated:
480V, 5.5-22 kW (7.5-30 HP) Open Style, 48A
Optional Cable Terminator
Voltage doubling at motor terminals, known as reflected wave
phenomenon, standing wave or transmission line effect, can occur
when using drives with long motor cables.
Inverter duty motors with phase-to-phase insulation ratings of 1200
volts or higher should be used to minimize effects of reflected wave
on motor insulation life.
Applications with non-inverter duty motors or any motor with
exceptionally long leads may require an output filter or cable
terminator. A filter or terminator will help limit reflection to the
motor, to levels which are less than the motor insulation rating.
Table 2.D lists the maximum recommended cable length for
unterminated cables, since the voltage doubling phenomenon occurs
at different lengths for different drive ratings. If your installation
requires longer motor cable lengths, a reactor or cable terminator is
recommended. Refer to Table 2.D for frequency, cable length and
voltage restrictions of 1204-TFA1 or 1204-TFB2 terminators.
Output Devices
Cable Termination