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3. SIGNALS AND WIRING
3 - 3
3.1 Input power supply circuit
CAUTION
Always connect a magnetic contactor between the power supply and the main
circuit power supply (L1, L2, and L3) of the servo amplifier, in order to configure a
circuit that shuts down the power supply on the side of the servo amplifier’s power
supply. If a magnetic contactor is not connected, continuous flow of a large
current may cause a fire when the servo amplifier malfunctions.
Use ALM (Malfunction) to switch main circuit power supply off. Not doing so may
cause a fire when a regenerative transistor malfunctions or the like may overheat
the regenerative resistor.
Check the servo amplifier model, and then input proper voltage to the servo
amplifier power supply. If input voltage exceeds the upper limit, the servo amplifier
will break down.
The servo amplifier has a built-in surge absorber (varistor) to reduce noise and to
suppress lightning surge. The varistor can break down due to its aged
deterioration. To prevent a fire, use a molded-case circuit breaker or fuse for input
power supply.
Connecting a servo motor of the wrong axis to U, V, W, or CN2 of the servo
amplifier may cause a malfunction.
The N- terminal is not a neutral point of the power supply. Incorrect wiring will
cause a burst, damage, etc.
POINT
Even if alarm has occurred, do not switch off the control circuit power supply.
When the control circuit power supply has been switched off, optical module
does not operate, and optical transmission of SSCNET III/H communication is
interrupted. Therefore, the next axis servo amplifier displays "AA" at the
indicator and turns into base circuit shut-off. The servo motor stops with starting
dynamic brake.
EM2 has the same function as EM1 in the torque control mode.
Connect the 1-phase 200 V AC to 240 V AC power supply to L1 and L3. One of
the connecting destinations is different from MR-J3 Series Servo Amplifier's.
When using MR-J4 as a replacement for MR-J3, be careful not to connect the
power to L2.
Configure the wiring so that the main circuit power supply is shut off and the servo-on command turned off
after deceleration to a stop due to an alarm occurring, an enabled servo forced stop, or an enabled controller
forced stop. A molded-case circuit breaker (MCCB) must be used with the input cables of the main circuit
power supply.