Rockwell Automation 1336Z SPIDER - FRN 2.xxx-5.xxx - Manual (Page 23)

General Installation for All Drives 2–13
Common Mode Cores
The 1336 SPIDER includes an integral output common mode core.
This will help reduce the common mode noise at the drive output and
guard against interference with other electrical equipment (program-
mable 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 for
additional information.
Table 2.F
1336 SPIDER Common Mode Chokes
Cable Termination Optional Cable Terminator
Voltage doubling at motor terminals, known as reflected wave phe-
nomenon, 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 excep-
tionally 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 untermi-
nated cables, since the voltage doubling phenomenon occurs at differ-
ent lengths for different drive ratings. If your installation requires
longer motor cable lengths, a reactor or cable terminator is recom-
mended.
Optional Input/Output Reactor Specifications
Bulletin 1321 Reactors listed in the 1336 PLUS-3.0 Price Sheet can
be used for drive input and output. These reactors are specifically
constructed to accommodate IGBT inverter applications with switch-
ing frequencies up to 20 kHz. They have a UL approved dielectric
strength of 4000 volts, opposed to a normal rating of 2500 volts. The
first two and last two turns of each coil are triple insulated to guard
against insulation breakdown resulting from high dv/dt. When using
motor line reactors, it is recommended that the drive PWM frequency
be set to its lowest value to minimize losses in the reactors.
Important: By using an output reactor the effective motor voltage will
be lower because of the voltage drop across the reactor -
this may also mean a reduction of motor torque.
Catalog Number Used with . . . Description
1321-M001 Communications Cables, Analog
Signal Cables, etc. Open Style - Signal Level