Rockwell Automation GV3000/SE AC Gen. Purpose and Vector Drive Software Start-Up and Ref. Manual - Manual (Page 125)

Programming Reference 4-39
This diagnostic detects phase loss between the drive and the motor. When the
diagnostic is enabled and output phase loss is detected, a drive fault is logged (OPL is
displayed).
The output phase loss diagnostic can be disabled to avoid nuisance faults which may
occur, for example, when a small motor is used with a large Power Module.
This parameter can compensate for acoustic noise by allowing adjustment of the
switching frequency of the transistors in the inverter bridge.
Keeping the carrier frequency at 8 kHz will ordinarily provide the quietest motor
operation.
Setting the carrier frequency above 2 kHz on M/N 50R41xx, 50T41xx, 75R41xx,
75T41xx, and 125R41xx Power Modules results in the derating of the maximum
output current. With a 4 kHz carrier frequency, derate the Power Module maximum
output current by 20%. With an 8 kHz carrier frequency, derate by 40%.
See the GV3000/SE hardware reference manual for the Power Module ratings at a
2 kHz carrier frequency. See P.095 in this chapter which displays the maximum output
current rating of the drive. Note that the range is limited from 2 to 4 kHz on
M/N 200V41xx, 250V41xx, 300V41xx, 350V41xx, and 400V41xx Power Modules.
P.045 Output Phase Loss Enable
This parameter is
used to enable the
output phase loss
detection diagnostic.
Parameter Range: OFF = Disable output phase loss diagnostic
ON = Enable output phase loss diagnostic
Default Setting: ON
Parameter Type: Tunable
Refer also to parameters: N/A
P.047 Carrier Frequency (kHz)
This parameter
selects the drive’s
carrier frequency.
Parameter Range: 2 = 2 kHz carrier frequency
4 = 4 kHz carrier frequency
8 = 8 kHz carrier frequency
Default Setting: Power Module-dependent, see Appendix C
Parameter Type: Configurable
Refer also to parameters: N/A