Instantaneous Power Failure Tough Drive Function - Mitsubishi MR-JE-10A Instruction Manual

7. SPECIAL ADJUSTMENT FUNCTIONS

7.3.2 Instantaneous power failure tough drive function

CAUTION
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 tolerance against instantaneous power failure 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 Instantaneous power failure tough drive - detection time]. In addition, [AL.10.2
Bus voltage drop] detection level for the bus voltage is changed automatically.
The tolerance against instantaneous power failure is increased by the
instantaneous power failure tough drive function. However, it is not guarantee to
comply with the SEMI-F47 standard.
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 Instantaneous power failure tough drive - detection time].
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