3. SIGNALS AND WIRING 
 
3 -  20 
 
3.3 Explanation of power supply system 
3.3.1 Signal explanations 
 
POINT 
 
For the layout of connector and terminal block, refer to chapter 9 DIMENSIONS. 
 
 
Symbol 
Connection target 
(application) 
Description 
Supply the following power to L1, L2, and L3. For 1-phase 200 V AC to 240 V AC, connect the 
power supply to L1 and L3. Leave L2 open. 
 
 Servo amplifier
Power 
MR-J4-10A(-RJ) to 
MR-J4-70A(-RJ) 
MR-J4-100A(-RJ) to  
MR-J4-22KA(-RJ) 
MR-J4-60A4(-RJ) to
MR-J4-22KA4(-RJ)
  3-phase 200 V AC to 240 
V AC, 50 Hz/60 Hz 
L1/L2/L3 
 
  1-phase 200 V AC to 240 
V AC, 50 Hz/60 Hz 
L1/L3 
 
  3-phase 380 V AC to 480 
V AC, 50 Hz/60 Hz 
 
L1/L2/L3 
L1/L2/L3 
Main circuit power 
supply 
     
P3/P4 
Power factor 
improving 
DC reactor 
When not using the power factor improving DC reactor, connect P3 and P4(factory-wired). 
When using the power factor improving DC reactor, disconnect P3 and P4, and connect the 
power factor improving DC reactor to P3 and P4. 
Refer to section 11.11 for details. 
P+/C/D Regenerative option 
(1) 200 V class 
1) MR-J4-500A(-RJ) or less 
When using a servo amplifier built-in regenerative resistor, connect P+ and D (factory-
wired). 
When using a regenerative option, disconnect P+ and D, and connect the regenerative 
option to P+ and C. 
2) MR-J4-700A(-RJ) to MR-J4-22KA(-RJ) 
MR-J4-700A(-RJ) to MR-J4-22KA(-RJ) do not have D. 
When using a servo amplifier built-in regenerative resistor, connect P+ and C (factory-
wired). 
When using a regenerative option, disconnect wires of P+ and C for the built-in 
regenerative resistor. And then connect wires of the regenerative option to P+ and C. 
(2) 400 V class 
1) MR-J4-350A4(-RJ) or less 
When using a servo amplifier built-in regenerative resistor, connect P+ and D. (factory-
wired) 
When using a regenerative option, disconnect P+ and D, and connect the regenerative 
option to P+ and C. 
2) MR-J4-500A4(-RJ) to MR-J4-22KA4(-RJ) 
MR-J4-500A4(-RJ) to MR-J4-22KA4(-RJ) do not have D. 
When using a servo amplifier built-in regenerative resistor, connect P+ and C. (factory-
wired) 
When using a regenerative option, disconnect wires of P+ and C for the built-in 
regenerative resistor. And then connect wires of the regenerative option to P+ and C. 
Refer to section 11.2 to 11.5 for details. 
Supply the following power to L11 and L21. 
 
 Servo amplifier
Power 
MR-J4-10A(-RJ) to  
MR-J4-22KA(-RJ) 
MR-J4-60A4(-RJ) to  
MR-J4-22KA4(-RJ) 
  1-phase 200 V AC to 240 V AC  L11/L21   
  1-phase 380 V AC to 480 V AC    L11/L21 
L11/L21 
Control circuit power 
supply