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7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 24
7.3.2 Instantaneous power failure tough drive function
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 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 Instantaneous power failure tough drive - Detection time].
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].
(1) Instantaneous power failure time > [Pr. PF25 Instantaneous power failure tough drive - Detection time]
The alarm occurs when the instantaneous power failure time exceeds [Pr. PF25 Instantaneous power
failure tough drive - Detection time].
MTTR (During tough drive) turns on after the instantaneous power failure is detected.
MBR (Electromagnetic brake interlock) turns off when the alarm occurs.
Power supply
Bus voltage
Undervoltage level
(200 V DC)
A
LM
(Malfunction)
[Pr. PF25]
Instantaneous power failure time
MTTR
(During tough drive)
MBR
(Electromagnetic
brake interlock)
Base circuit
ON
OFF
ON
OFF
ON
OFF
WNG
(Warning)
ON
OFF
ON
OFF
ON
OFF