Inovance MD800 Series - Reverse Frequency Inhibition

Function Applications
-505-
As shown in the preceding figure, during acceleration, when the running frequency increases to a value
that is close to the jump frequency, the AC drive runs for a period at the current frequency and then
skips over the jump frequency. The jump range is twice the value of F8-11 (jump frequency amplitude).
During deceleration, when the running frequency decreases to a value that is close to the jump
frequency, the AC drive runs for a period at the current frequency and then skips over the jump
frequency. The jump range is twice the value of F8-11 (jump frequency amplitude).
Related Parameters
Para. No. Name
Default
Value Range Description
F8-09
Jump
frequency 1
0.00 Hz
0.00 to maximum
frequency (F0-10)
The jump frequency enables the AC drive to
avoid any frequency at which a mechanical
resonance may occur. This parameter defines
the first jump frequency. If it is set to 0, the first
jump frequency is canceled.
F8-10
Jump
frequency 2
0.00 Hz
0.00 to maximum
frequency (F0-10)
The jump frequency enables the AC drive to
avoid any frequency at which a mechanical
resonance may occur. This parameter defines
the second jump frequency. If it is set to 0, the
second jump frequency is canceled.
F8-11
Jump
frequency
amplitude
0.00 Hz 0.00 Hz to 5.00 Hz
During acceleration, when the running frequency
increases to a value that is close to the jump
frequency, the AC drive runs for a period at the
current frequency and then skips over the jump
frequency. The jump range is twice the value of
F8-11 (jump frequency amplitude).
During deceleration, when the running
frequency decreases to a value that is close to
the jump frequency, the AC drive runs for a
period at the current frequency and then skips
over the jump frequency. The jump range is
twice the value of F8-11 (jump frequency
amplitude).
F8-12
Jump
frequency
selection
during
acceleration/
deceleration
0
0: Inactive
1: Active
This parameter defines whether the jump
frequency is active during acceleration/
deceleration.
When it is inactive, the AC drive continues to run
at the running frequency when the running
frequency is near the jump frequency during
acceleration and deceleration.
When it is active, the AC drive skips over the
jump frequency when the running frequency is
near the jump frequency during acceleration and
deceleration. The jump range is twice the value
of F8-11 (jump frequency amplitude).
4.5.2.4 Reverse Frequency Inhibition
F8-14 defines reverse frequency inhibition. The following figure shows the schematic diagram of
reverse frequency inhibition.