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3. SIGNALS AND WIRING
3.5 Power line circuit
CAUTION
Always connect a magnetic contactor (MC) between the main circuit power supply
and L
1, L2, and L3 of the servo amplifier, and configure the wiring to be able to shut
down the power supply on the side of the servo amplifier’s power supply. If a
magnetic contactor (MC) is not connected, continuous flow of a large current may
cause a fire when the servo amplifier malfunctions.
Switch power off at detection of an alarm. Otherwise, a regenerative transistor fault
or the like may overheat the regenerative resistor, causing a fire.
POINT
For the power line circuit of the MR-J2S-11KB to MR-J2S-22KB, refer to
section 3.12 where the power line circuit is shown together with the servo
motor connection diagram.
3.5.1 Connection example
Wire the power supply/main circuit as shown below so that power is shut off and the servo-on command
turned off as soon as an alarm occurs, a servo forced stop is made valid, or a controller forced stop is made
valid. A no-fuse breaker (NFB) must be used with the input cables of the power supply.
(1) For 3-phase 200 to 230V power supply
EM1
COM
OFF
ON
MC
MC
SK
NFB MC
L
1
L2
L
3
L
11
L
21
VDD
SG
(Note 2)
Alarm
RA1
Controller
forced stop
RA2
Forced
stop
Servo amplifier
Forced stop
(Note 1)
P
P
1
Power supply
3-phase
200 to 230V
Note 1. Make sure to connect P1-P. (Factory-wired.) When using the power factor improving DC reactor, refer to section 12.2.4.
2. Configure up the power supply circuit which switches off the magnetic contactor after detection of alarm occurrence on the
controller side.