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3. SIGNALS AND WIRING
3.3 Explanation of power supply system
3.3.1 Signal explanations
POINT
For the layout of connector, refer to chapter 9 DIMENSIONS.
Abbreviation
Connection target
(application)
Description
L1
L
2
Main circuit power
supply
Supply the following power supply.
MR-JN-10A/20A/40A : 1-phase 200VAC to 230VAC, 50/60Hz
MR-JN-10A1/20A1 : 1-phase 100VAC to 120VAC, 50/60Hz
P
C
Built-in regenerative
resistor
or
regenerative option
1) MR-JN-10A(1)
When using the regenerative option, connect it to P and C. (MR-JN-10A(1)
does not provide a built-in regenerative resistor.)
2) MR-JN-20A(1)/40A
When using the servo amplifier built-in regenerative resistor, connect the
built-in regenerative resistor to P and C. (Factory-wired.)
When using a regenerative option,
first, disconnect the wirings to P and C,
second, remove the built-in regenerative resistor from the servo
amplifier,
finally, connect the regenerative option to P and C.
+24V
0V
Control circuit power
supply
Supply 24VDC power to +24V and 0V.
U
V
W
Servo motor power
Connect to the servo motor power supply terminals (U, V, W). Connect the
servo amplifier power supply output (U, V, and W) to the servo motor power
supply input (U, V, and W) directly. Do not let a magnetic contactor, etc.
intervene. Otherwise, it may cause a malfunction.
Protective earth (PE)
Connect to the earth terminal of the servo motor and to the protective earth
(PE) of the control box to perform grounding.
3.3.2 Power-on sequence
(1) Power-on procedure
1) Always wire the power supply as shown in above section 3.1 using the magnetic contactor with the main
circuit power supply (single-phase: L
1
, L
2
). Configure up an external sequence to switch off the magnetic
contactor as soon as an alarm occurs.
2) The servo amplifier can accept the servo-on (SON) about 1 to 2s after the main circuit power supply is
switched on. Therefore, when the servo-on (SON) is switched on simultaneously with the main circuit
power supply, the base circuit will switch on in about 1 to 2s, and the ready (RD) will switch on in further
about 5ms, making the servo amplifier ready to operate. (Refer to paragraph (2) in this section.)
If the main circuit power supply is OFF while the servo-on (SON) is ON, the display on the servo
amplifier shows the corresponding warning. Switching ON the main circuit power supply discards the
warning and the servo amplifier operates normally.
3) When the reset (RES) is switched on, the base circuit is shut off and the servo motor shaft coasts.
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