Mitsubishi Electric MELSERVO-JE MR-JE-100A, Instruction Manual

Page: 217 / 310

7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 22
7.3.2 Instantaneous power failure tough drive function
CAUTION
The immunity to instantaneous power failures is increased by the instantaneous
power failure tough drive function. However, it is not guarantee to comply with the
SEMI-F47 standard.
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 power] detection time for the power supply can be
changed by [Pr. PF25 SEMI-F47 function - Instantaneous power failure detection time (instantaneous power
failure tough drive - detection time)]. In addition, [AL.10.2 Bus voltage drop] 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.
Selecting "Enabled (_ _ _ 1)" for "Torque limit function selection at
instantaneous power failure" in [Pr. PA26] will limit torques to save electric
energy when an instantaneous power failure occurs during operation and will
make [AL. 10 Undervoltage] less likely to occur.
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 SEMI-F47 function - Instantaneous power failure detection
time (instantaneous power failure tough drive - detection time)].