Mitsubishi Electric MELSERVO-J3 Series Manual page 339

Part 5: Common Reference Material
b) Gain return time constant disabled was selected.
The gain switching time constant is enabled. The time constant is disabled at gain return.
The following example shows for [Pr. PB26 (CDP)] = 0201, [Pr. PB27 (CDL)] = 0, and [Pr.
PB28 (CDT)] = 100 [ms].
CDP (Gain switching)
Gain switching
(7) Tough drive function
This function makes the equipment continue operating even under the condition that an alarm occurs.
The vibration tough drive function and instantaneous power failure tough drive function are available with
the J3 extension function.
(a) Vibration tough drive function
This function prevents vibration by resetting a filter instantaneously when machine resonance occurs
due to varied vibration frequency caused by machine aging.
To reset the machine resonance suppression filters with the function, [Pr. PB13 Machine resonance
suppression filter 1] and [Pr. PB15 Machine resonance suppression filter 2] should be set in
advance.
Set [Pr. PB13] and [Pr. PB15] as follows.
1) One-touch tuning execution (Refer to (4) of this section.)
2) Manual setting (Refer to (2) of this section.)
The vibration tough drive function operates when a detected machine resonance frequency is within
±30% for a value set in [Pr. PB13 Machine resonance suppression filter 1] or [Pr. PB15 Machine
resonance suppression filter 2].
To set a detection level of the function, set sensitivity in [Pr. PX26 Vibration tough drive - Oscillation
detection level].
OFF
63.4%
Before-switching gain
Switching at [Pr. PB28 (CDT)] = 100 [ms] only when gain switching on (when switching)
POINT
Set enable/disable of the tough drive function with [Pr. PX25 Tough drive
setting]. (Refer to (2) of this section.)
POINT
Resetting [Pr. PB13] and [Pr. PB15] by the vibration tough drive function is
performed constantly. However, the number of write times to the EEPROM is
limited to once per hour.
The vibration tough drive function does not reset [Pr. PX17 Machine resonance
suppression filter 3], [Pr. PX19 Machine resonance suppression filter 4], and [Pr.
PX21 Machine resonance suppression filter 5].
The vibration tough drive function does not detect a vibration of 100 Hz or less.
ON
After-switching gain
CDT = 100 ms
5 - 154
OFF
Return time constant disabled
Switching at 0 ms