Avoiding Mechanical Resonance Of Motor And Machine - Hitachi WJ Series User Manual

Chapter 9
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
Q
system?
 The frequency jump function is used to avoid the resonance points on inverter-driven machines.
A
 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
[A063] Jump frequency 1
[A065] Jump frequency 2
[A067] Jump frequency 3
[A064] Jump frequency width 1
[A066] Jump frequency width 2
[A068] Jump frequency width 3
[A067]
[A065]
[A063]
Item
Sets the center of the frequency range you
want to jump. When 0.00 Hz is specified,
the frequency jump function is disabled.
Sets 1/2 of the frequency range you want
to jump. The frequency jumps a range of ±
jump width from the jump speed.
Output frequency
[A064]
[A064]
Description
[A068]
[A068]
[A066]
[A066]
9-10-5
Inverter Functions
Data
0.00 to 590.00 (Hz)
0.00 to 10.00 (Hz)
Frequency command