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7. Wiring and Connection
7 - 14
7-7 Wiring of contactors
7-7-1 Contactor control
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”.)
CAUTION