Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 274

■When the bus voltage does not decrease to the undervoltage level or lower within
instantaneous power failure time of control circuit power supply
The operation continues without alarming.
ON (Energization)
Control circuit
OFF (Power failure)
power supply
Bus voltage
*1
Undervoltage levelv
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." iin
"Parameter setting" below.

Page 273 Parameter setting
7 SPECIAL ADJUSTMENT FUNCTIONS
272
7.3 Tough drive function
Instantaneous power failure time of the
control circuit power supply
[Pr. PF25]
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF