Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 272

Instantaneous power failure time of the control circuit power supply > [Pr. PF25 SEMI-
F47 function - Instantaneous power failure detection time]
The alarm occurs when the instantaneous power failure time of the control circuit power supply exceeds [Pr. PF25 SEMI-F47
function - Instantaneous power failure detection time].
MTTR (During tough drive) turns on after detecting the instantaneous power failure.
MBR (Electromagnetic brake interlock) turns off when the alarm occurs.
ON (Energization)
Control circuit
OFF (Power failure)
power supply
Bus voltage
*1
Undervoltage level
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
7 SPECIAL ADJUSTMENT FUNCTIONS
270
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