3 - 2
3. SIGNALS AND WIRING
3.1 Input power supply circuit
CAUTION
Always connect a magnetic contactor (MC) between th e main circuit power supply
and L1, 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 suppl y. If a
magnetic contactor (MC) is not connected, c ontinuous flow of a large current may
cause a fire when the servo amplifier malf unctions.
Use the trouble signal to switch main circuit power supply off. Otherwise, a
regenerative transistor fault or the like ma y overheat the regenerative resistor,
causing a fire.
POINT
Even if alarm has occurred, do not switch off the control circuit power s upply.
When the control circuit power supply has been switched off, optical m odule
does not operate, and optical transmission of SSCNET communication is
interrupted. Therefore, the servo amplifier on the rear axis displa ys "AA" at
the indicator and turns into base circuit shut-off. The servo amplif ier stops
with starting dynamic brake.
Wire the power supply/main circuit as shown b elow so that power is shut off and the servo-on com mand turned
off as soon as an alarm occurs, a servo forced st op is made valid, or a controller forced stop is made val id. A
no-fuse breaker (NFB) must be used with the inpu t cables of the main circuit power supply.
(1) For 3-phase 200V to 230VAC power supply to MR-J3-10B to MR-J3-350B
EM1
NFB MC
L1
L2
L3
ALM RA1
P1
P( )
DICOM
DOCOM
L11
L21
N( )
D
C
U
V
W
(Note 1)
(Note 2)
CNP1
CNP3
PE
CNP2
U
V
W
2
3
4
1
M
Motor
Encoder
CN2
24VDC
(Note 3)
Encoder cable
(Note 6)
DOCOM
Forced stop
CN3CN3
OFF
Forced
stop ON
MC
MC
SK
(Note 4)
Alarm
RA1
Controller
forced stop
RA2
Servo amplifier Servo motor
(Note 5)
Trouble
(Note 4)
(Note 5)
3-phase
200 to
230VAC
P2