Toshiba H9 Installation And Operation Manual page 138

F270
Figure 29. UP/Down Frequency Operation Control Timing Diagram.
Jump Frequency 1
Program ⇒ Special ⇒ Jump Frequencies
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.
130
Direct Access Number — F270
Parameter Type — Numerical
Factory Default — 0.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — Max. Freq. (F011)
Units — Hz
H9 ASD Installation and Operation Manual
F270