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3. WIRING
3 - 5 Power supply circuit
CAUTION
(1) Power-on sequence
1) Always wire the power supply as shown below using magnetic contactors with the main circuit
power supply (L1, L2, L3). Configure up an external sequence to switch off the magnetic contactors
as soon as an alarm occurs.
2) Switch on the control circuit power supply L11, L21 simultaneously with the main circuit power
supply or before switching on the main circuit power supply. If the main circuit power supply is not
on, the display shows the corresponding warning. However, by switching on the main circuit power
supply, the warning disappears and the servo amplifier will operate properly.
3) The servo amplifier can accept the servo-on signal (SON) about 1 second after the main circuit
power supply is switched on. Therefore, when SON is switched on simultaneously with the three-
phase power supply, the base circuit will switch on in about 1 second, making the servo amplifier
ready to operate. (Refer to paragraph (2) in this section.)
4) For the structure of the external circuit, refer to Section 2-1.
(2) Connection example
Wire the power supply and main circuits as shown below. A no-fuse breaker (NFB) must be used with
the input cables of the power supply.
Wire the circuits so that detection of alarm occurrence switches on power and simultaneously turns off
the servo on signal.
1) For three-phase 200 to 230VAC power supply
Three-phase
200 to 230AC
1. When the servo amplifier has become faulty, switch power off on the servo amplifier
power side. Continuous flow of a large current may cause a fire.
2. Use the trouble signal to switch power off. Otherwise, a regenerative brake
transistor fault or the like may overheat the regenerative brake resistor, causing a
fire.
NFB
Emergency stop
Servo on
Emergency stop
OFF
RA
MC
L1
L2
L3
L11
L21
EM1
SG
VDD
COM
3 - 30
ON
MC
MC
SK
Servo amplifier
MR-J2- B
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