Mitsubishi Electric FR-F800, Instruction Manual

Page: 709 / 834

Parameters (G) Control parameters
FR-F800 5 - 547
Control block diagram
Setting method
●
When vibration caused by mechanical resonance occurs, set Pr. 653 "Speed smoothing control"
to 100%, and operate at the operation frequency with largest vibration, and confirm if the
vibration is suppressed after few seconds.
●
If there is no effect, gradually raise the setting value of Pr. 653, perform the operation and
confirmation of the effect repeatedly, and use the value (Pr. 653) with most effect as the final
setting value.
●
If the vibration gets larger by raising Pr. 653, lower the value of Pr. 653 under 100%, and perform
the confirmation of result in a same manner.
●
When the vibration frequency (frequency of torque deviation, speed deviation, or converter
output voltage deviation) by the mechanical resonance with a measurement device, etc., set the
frequency of 1/2 to 1 times the vibration frequency in Pr. 654 "Speed smoothing cutoff frequency".
(Setting vibrational frequency range can suppress the vibration better.)
I002760E
Fig. 5-265: Control block diagram
Fig. 5-266:
Setting method
I002761E
NOTE Depending on the equipment, the vibration may not be suppressed sufficiently or the effect is not
obtained.
+
-
Acceleration/deceleration
processing
Output frequency
V/F control
Speed smoothing control
Cutoff frequency
Pr. 654
Proportional gain
Pr. 653
Current for torque
Speed
command
Frequency output
Voltage output
0
Current for
torque
Torque fluctuation
detection range
Cutoff frequency
Pr. 654 159 Hz (fixed)
Vibrational
frequency