3 SIGNALS AND WIRING
3.1 Example power circuit connections
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3
3.1 Example power circuit connections
• Connect a magnetic contactor between a power supply and the main circuit power supply (L1/L2/L3) of a servo amplifier to
configure a circuit that shuts off the power supply on the servo amplifier side because failure of the servo amplifier may
cause smoke and fire if a magnetic contactor is not connected.
• Use a configuration that shuts off the main circuit power supply with ALM (Malfunction).
• Check the servo amplifier model and use the correct power supply voltage.
• Exogenous noise or lightning surges may degrade the characteristics of the surge absorber (varistor) built into the servo
amplifier and damage it.
• Do not shut off the control circuit power supply even if an alarm occurs. If the control circuit power supply is shut off,
network communication will be interrupted.
• In the torque mode, EM2 functions the same as EM1.
• If using the MR-J5 servo amplifier with the DC power supply input, refer to the following.
Page 38 Using servo amplifier with DC power supply input
• To prevent malfunction, avoid bundling the servo amplifier's power lines (input/output) and signal cables together or running
them parallel to each other. Separate the power lines from the signal cables.
• Provide adequate protection to prevent an unexpected restart after an instantaneous power failure.
• If using a regenerative resistor, configure a circuit that shuts off the main circuit power supply with ALM (Malfunction)
because abnormal overheating of the regenerative resistor may cause smoke and fire.
• Configure wiring so that the main circuit power supply is shut off and the servo-on command is turned off after deceleration
to a stop due to an alarm occurrence, an enabled servo forced stop, or a quick stop command from the controller. Use a
molded-case circuit breaker (MCCB) with the input cables of the main circuit power supply.
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