Rockwell Automation 20D PowerFlex 700S with Phase I Control Reference Manual - Manual (Page 76)

76 Rockwell Automation Publication PFLEX-RM002D-EN-E - August 2013
Chapter 1 Detail Drive Configuration and Operation
Output Devices Drive Output Disconnection
Rockwell Automation drives can be used with an output contactor between the
drive and motor. This contactor can be opened under load without damage to the
drive. It is recommended, however, that the drive have a programmed “Enable”
input and that this input be opened at the same time as the output contactor.
Cable Termination
See the Wiring and Grounding Guidelines for Pulse Width Modulated (PWM)
AC Drives, publication
DRIVES-IN001 , for detailed information.
Output Reactor
Bulletin 1321 Reactors can be used for drive input and output. These reactors are
specifically constructed to accommodate IGBT inverter applications with
switching frequencies up to 20 kHz. They have a UL approved dielectric strength
of 4000 volts, opposed to a normal rating of 2500V. 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.
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.
Output Display Output Current (Parameter 308)
Displays measured RMS drive output current. Parameter 297 [Output Curr
Disp] which is the integer equivalent of parameter 308 with * internal storage in
1/10 A (10 = 1.0 A).
Output Frequency (Parameter 310)
This parameter displays the actual output frequency of the drive. The output
frequency is created by a summation of commanded frequency and any active
speed regulator such as slip compensation, PI Loop, bus regulator. The actual
output may be different than the commanded frequency.
ATTENTION: Any disconnecting means wired to the drive output terminals U, V
and W must be capable of disabling the drive if opened during drive operation.
If opened during drive operation, the drive will continue to produce output
voltage between U, V, W. An auxiliary contact must be used to simultaneously
disable the drive.