Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 390

13. SERVO AMPLIFIERS WITH A LARGE CAPACITY (30k TO 55kW)
2) When connecting two brake units to a converter unit
POINT
To use brake units with a parallel connection, use two sets of FR-BU2-(H)
brake unit. Combination with other brake unit results in alarm occurrence or
malfunction.
Always connect the master and slave terminals (MSG and SD) of the two
brake units.
Do not connect the converter unit and brake units as below. Connect the
cables with a terminal block to distribute as indicated in this section.
Converter unit
L
L
Connecting two cables to
P and N terminals
Brake unit
P/
N/
Brake unit
P/
N/
13 - 93
Converter unit Brake unit
L P/
L N/
Brake unit
P/
N/
Passing wiring