Hitachi WJ C1 Series

Chapter 9 Inverter Functions
9-10-5
9.10.5 Avoiding Mechanical Resonance of Motor and Machine
 How to avoid strong vibrations at a certain speed when driving the motor installed in the
system?
 The frequency jump function is used to avoid the resonance points on inverter-driven machines.
 The jump frequency can be set in three locations.
 The output frequency within the range of the jump command varies continuously according to
the normal acceleration/deceleration time.
 When this function is specified, the output frequency cannot be set within the jump frequency
range in order to avoid steady operation within the jump frequency range. A warning appears
when the frequency command set in [F001]/[A020]/[A220]/[A021] to [A035] is within the
frequency range specified in the jump frequency. For details on warnings, refer to "15.3.1
Warning Display".
Code
Item
Description
Data
[A063]
Jump frequency 1
Sets the center of the frequency range you
want to jump. When 0.00 Hz is specified,
the frequency jump function is disabled.
0.00 to 590.00 (Hz)
[A065]
Jump frequency 2
[A067]
Jump frequency 3
[A064]
Jump frequency width 1
Sets 1/2 of the frequency range you want
to jump. The frequency jumps a range of ±
jump width from the jump speed.
0.00 to 10.00 (Hz)
[A066]
Jump frequency width 2
[A068]
Jump frequency width 3
Output frequency
Frequency command
[A063]
[A065]
[A067]
[A064]
[A064]
[A066]
[A066]
[A068]
[A068]
Q
A
!