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Insert a contactor (magnetic contactor) in the main circuit power supply input (L1, L2, L3) of the servo 
drive unit, and shut off the power supply input when an emergency stop or servo alarm occurs.  
When an emergency stop or servo alarm occurs, the servo drive unit stops the motor using deceleration 
control or dynamic brakes. The contactors cannot be shut off because the power supply for deceleration 
to be held. Therefore, the drive unit always

 

controls the contactors. The NC unit confirms the stop of all 

axes or the dynamic brake operation. Then it outputs a shutoff command to the drive units that drive 
contactors. 
 

1.   The contactors cannot be driven from other than a drive unit. Undervoltage 

(alarm) may occur if the contactors are shut off at the same time as an 
emergency stop occurrence.  

2.   Do not directly shut off the contactors with an external sequence. If they 

are shut off earlier than the emergency stop input, or if the input power 
supply is shut off during the deceleration control or vertical axis drop 
prevention control, an undervoltage alarm will occur, and deceleration 
control or drop hold may not be possible. For double-protection, use a 
power supply unit external emergency stop input.  

    (Refer to section "7-9 Wiring of an external emergency stop”.)