Chapter 6 Wiring
6–8
6-3-2 Example of connection for controlling magnetic switch with external sequence circuit
Mitsubishi
CNC
I/F unit
MC
Ｌ１１
Ｌ１２
ＰＥ
Ｌ１
Ｌ２
Ｌ３
Ｌ１１
Ｌ１２
ＰＥ
Ｌ１
Ｌ２
Ｌ３
3-phase
200VAC
Relay
Prepare a sequence that
cuts off with the alarm.
NFB
Class 3 grounding
or higher
24VDC
Intelligent
servomotor
External
emergency
stop
Terminator
External
emergency stop
Intelligent
servomotor
6-3-3 Wiring of contactors (MC)
A contactor (magnetic contactor) is inserted in the main circuit power supply input (L1, L2, L3) of
servo amplifier, and the power supply input is shut off when an emergency stop or servo alarm
occurs.
When an emergency stop or servo alarm occurs, the servo amplifier stops the motor using
deceleration control or a dynamic brake. The contactors cannot be shut off during deceleration control,
because the regeneration energy (MDS-B-CV Series) is returned to the power supply, and the power
supply for deceleration must be held. Therefore, the CNC controls the contactors. The CNC confirms
that all axes are stopped, or confirms the dynamic brake operation. Then it outputs a shutoff
command for amplifiers that drive contactors.
When actually driving the contactor, it is driven by the amplifier of the axis having the longest
deceleration time constant in consideration of the communication from the NC being cut off.
Generally, when a converter (MDS-B-CV/CVE/CR) is provided, the contact is driven by the converter.
When a spindle amplifier is provided, the contactor is driven by the spindle amplifier, and when the
servo amplifier (MDS-B-SVJ2) is provided, the contact is driven by the servo amplifier.
Give consideration to the above, and examine the contactor drive method in the following order of
priority.
1. Using the contactor control output (MC1) of the converter unit.
2. Driven by spindle amplifier (MDS-B-SPJ2 in this case).
3. Driving from the servo amplifier (MDS-B-SVJ2) of the vertical axis (unbalanced axis).
4. Driving from the servo amplifier (MDS-B-SVJ2) having the longest deceleration time constant.
5. Driven by external sequence (only for intelligent servomotor.)
CAUTION
Directly cut off the contact with an external sequence only when using the
intelligent servomotor. In this case, cut off the power supply with a delay longer
than the servo's acceleration/deceleration time constant in respect to the
emergency stop signal. If the input power is cut off during deceleration control,
(Order of priority of the contactor drive method)
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