Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 273

Instantaneous power failure time of the control circuit power supply < [Pr. PF25 SEMI-
F47 function - Instantaneous power failure detection time]
Operation status differs depending on how bus voltage decreases.
■When the bus voltage decreases to the undervoltage level or lower within instantaneous
power failure time of control circuit power supply
[AL. 10 Undervoltage] occurs when the bus voltage decreases to the undervoltage level or lower regardless of the enabled
instantaneous power failure tough drive.
ON (Energization)
Control circuit
OFF (Power failure)
power supply
Bus voltage
Undervoltage level *1
ALM
(Malfunction)
WNG
(Warning)
MTTR
(During tough drive)
MBR
(Electromagnetic
brake interlock)
Base circuit
*1 For the undervoltage level, refer to "[AL. 10.2 Voltage drop in the main circuit power] will occur when bus voltage is as follows." in
"Parameter setting" below.

Page 273 Parameter setting
Instantaneous power failure time of the control circuit power supply
[Pr. PF25]
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
7 SPECIAL ADJUSTMENT FUNCTIONS
7.3 Tough drive function
7
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