Mitsubishi Electric FR-A800, Instruction Manual

Page: 681 / 1042

Parameters (A) Application parameters
FR-A800 5 - 501
Swinging frequency setting (Pr. 1074 to Pr. 1079)
●
Set a swinging frequency in Pr. 1074 "Swinging suppression frequency". The swinging frequency
is used as a notch filter frequency. Lower the response level of speed control in the frequency
band with the width set in the Pr. 1076 "Swinging suppression width" by the gain set in the Pr. 1075
"Swinging suppression depth".
●
A deeper notch depth has a greater effect in reducing mechanical resonance, but because the
phase delay is larger, swinging may increase. Adjust by starting from the shallowest value.
●
If the Pr. 1076 setting is too large (the width is too wide), the response level of speed control will
drop, and the system may become unstable.
●
After setting Pr. 1074 = "9999", set the crane rope length in the Pr. 1077 "Rope length", the trolley
weight in the Pr. 1078 "Trolley weight", and the weight of an object in the Pr. 1079 "Load weight".
Then, swinging suppression control is performed using a vibration frequency estimated by the
inverter.
Waiting time for brake operation of swinging suppression control (Pr. 1072)
Set the time from when the output frequency becomes the Pr. 10 "DC injection brake operation fre-
quency" or less to when the zero speed control or the servo lock operation starts in the Pr. 1072 "DC
brake judgment time for swinging suppression control operation".
Setting value 3 2 1 0
Depth Shallow
➔
➔
Deep
Gain –4 dB –8 dB –14 dB –
∞
Tab. 5-209: Setting of depth and gain
I002840E
Fig. 5-241: Function of Pr. 1072
NOTES During swinging suppression control operation, even if the motor rotation is restricted to one
direction in the Pr. 78 "Reverse rotation prevention selection", the motor may rotate in a direction
opposite to the setting.
A protective function (E.OSD) may be activated during vibration control. When using vibration
control, set Pr. 690 "Deceleration check time" = "9999 (initial value)" to disable the deceleration
check function.
When swinging suppression control is enabled, regeneration avoidance, shortest acceleration/
deceleration, and the traverse function are disabled.
Do not set swinging suppression control and droop control together.
Frequency command of swinging suppression control
Time
Frequency
command
ON
Actual rotation
Pr. 1072
Zero speed control
Servo lock
Pr. 10 "DC injection brake
operation frequency"