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3. SIGNALS AND WIRING
3.1 Input power supply circuit
CAUTION
Configure the wiring so that the main circuit power supply is shut off and the servo-on command turns off
after deceleration to a stop due to an alarm occurring, an enabled servo forced stop, or a sudden stop
command from controller. A molded-case circuit breaker (MCCB) must be used with the input cables of the
main circuit power supply.
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 exogenous
noise and to suppress lightning surge. Exogenous noise or lightning surge
deteriorates the varistor characteristics, and the varistor may be damaged. 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, network module
does not operate, and transmission of network 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 mode.
When using the servo amplifier with the DC power supply input, refer to app. 1.
3 - 3
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