Mitsubishi Electric MELSERVO-J4 MR-J4 A Series - Page 235

7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 24
7.3.2 Instantaneous power failure tough drive function
CAUTION
During the instantaneous power failure tough drive, the torque may be limited due
to the load conditions or the set value of [Pr. PF25 Instantaneous power failure
tough drive - Detection time].
The immunity to instantaneous power failures is increased by the instantaneous
power failure tough drive function. However, it is not compliant with the SEMI-F47
specification.
The instantaneous power failure tough drive function avoids [AL. 10 Undervoltage] even when an
instantaneous power failure occurs during operation. When the instantaneous power failure tough drive
activates, the function will increase the immunity to instantaneous power failures using the electrical energy
charged in the capacitor in the servo amplifier and will change an alarm level of [AL. 10 Undervoltage]
simultaneously. The [AL. 10.1 Voltage drop in the control power] detection time for the control circuit power
supply can be changed by [Pr. PF25 Instantaneous power failure tough drive - Detection time]. In addition,
[AL.10.2 Voltage drop in the main circuit power] detection level for the bus voltage is changed automatically.
POINT
MBR (Electromagnetic brake interlock) will not turn off during the instantaneous
power failure tough drive.
When the load of instantaneous power failure is large, the undervoltage alarm
([AL. 10.2]) caused by the bus voltage drop may occur regardless of the set
value of [Pr. PF25 Instantaneous power failure tough drive - Detection time].