Toshiba Q9 Installation And Operation Manual page 115

F270
Figure 26. Up/Down Frequency Operation Control Timing Diagram.
Jump Frequency 1
Program  Special Controls
In conjunction with parameter F271, this parameter establishes a user-defined
frequency range: the Jump Frequency and a plus-or-minus value.
During acceleration, the output frequency of the drive will hold at the lower level
of the Jump Frequency range until the programmed acceleration ramp reaches
the upper level of the Jump Frequency range. At which time the output
frequency of the drive will accelerate to the upper level of the Jump Frequency
range and continue upward as programmed.
During deceleration, the output frequency of the drive will hold at the upper level
of the Jump Frequency range until the programmed deceleration ramp reaches
the lower level of the Jump Frequency range. At which time the output
frequency of the drive will decelerate to the lower level of the Jump Frequency
range and continue downward as programmed.
Once set up and enabled, it is on in all control modes.
User-selected frequencies may be jumped to avoid the negative effects of
mechanical resonance.
Q9 ASD Installation and Operation Manual
Direct Access Number — F270
Parameter Type — Numerical
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — Max. Freq. (F011)
Units — Hz
F270
105