Rockwell Automation 1336F PLUS II User Manual - Firmware 1.xxx-6.xxx - Manual (Page 142)

6–60 Programming
Motor Control
[Sync Loss Comp]
Sets the extra voltage to add when trying to get the motor
to re-sync after a loss of sync is detected.
Parameter Number 313
Parameter Type Read and Write
Display Units / Drive Units 1 Volt / 4096 = Drive Rtd. Volts
Factory Default 0 Volts
Minimum Value 0 Volts
Maximum Value 25% of Drive Rtd. Volts
[Sync Loss Time]
For [Sync Loss Sel] = “Fault,” the sync loss detection and
recovery function is enabled. If the sync loss continues
for longer than the time set by [Sync Loss Time], the drive
faults with an F67 “Motor Sync Loss” fault indication.
Parameter Number 312
Parameter Type Read and Write
Display Units / Drive Units 1 Second / Seconds x 100
Factory Default 5 Sec
Minimum Value 1 Sec
Maximum Value 30 Sec
[PWM Comp Time] –Firmware 4.001 & later
This parameter adjusts the PWM waveform dead time
compensation. This adjustment can improve the stability
of lightly loaded motors at low speed. Only D Frame and
larger drives will benefit from this adjustment. To tune the
drive, first set [Break Freq], then lower [PWM Comp Time]
until stable motor operation is achieved. [Stability Gain]
can also be used to help achieve stable motor operation.
Parameter Number 333
Parameter Type Read and Write
Display Units / Drive Units None
Factory Default 80
Minimum Value 20
Maximum Value 90
[Break Freq] – Firmware 4.001
[PWM Break Freq] – Firmware 5.001 & later
This parameter can only be changed on D Frame & larger
drives. This is the frequency where the dead time
compensation returns to the default value of 80. If the
motor has instability at low speeds, determine the point
where the instability ends, and add 5 Hz. A good starting
point is usually 10-15 Hz.
Parameter Number 334
Parameter Type Read and Write
Display Units / Drive Units 0.01 Hertz / 32767 = Maximum Freq Forward
Factory Default 0 Hz
Minimum Value 0 Hz
Maximum Value 30 Hz
[Stability Gain]
This parameter adjusts the gain of the torque component
of current to adjust for possible current instability in certain
motors caused by variations in design. Increasing this val-
ue to the correct setting for a particular motor will stabilize
torque pulsations in the motor.
Important: Setting this value too high may cause addition-
al instability. It should be set for the lowest value that
eliminates the instability.
Parameter Number 324
Parameter Type Read and Write
Display Units / Drive Units None
Factory Default 0
Minimum Value 0
Maximum Value 16