Mitsubishi Electric MELDAS MDS-B-SVJ2 Series, Specifications And Instruction Manual

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Chapter 2 Wiring and Connection
2-28
2-7-1 Contactor power ON sequences
The main circuit power supply is turned ON in the sequences in the following drawing when the
contactor control output (CN3 connector: MC) of the MDS-B-SVJ2 servo amplifier is used. In the
200msec interval after the amplifier emergency stop input is canceled, the contactor contact fusion is
checked by discharging the PN bus voltage with the regenerative resistor. A contactor fusion (alarm
5F) is detected when the contactor has fusion.
Contactor power ON sequences
POINT
1. The parameters must be set when controlling the contactor (CN3: drive with
MC) with the MDS-B-SVJ2.
2. A regenerative resistor is always required to detect contactor fusion.
Externally connect an option resistor when controlling contactors with the
SVJ2-01.
2-7-2 Contactor shutoff sequences
When an emergency stop or servo alarm occurs, the NC confirms the MC shutoff enabled (motor stop
or dynamic brake operation) for all axes, and then shuts off the contactors. When an MC shutoff
enabled signal is not output, the contactors will be forcibly shut off by the controlling unit after 30
seconds.
Contactor shutoff sequences
OFF
ON
ON
OFF
ON
OFF
0 500 1000 1500
Time
（
msec
）
Command input enable
OFF
ON
OFF
ON
ON
OFF
Contactor fusion check
PN charging completion
ON
OFF
Ready completion
Emergency stop (EMG)
Contactor control output
(MC)
PN bus voltage
Dynamic brake
Motor ON (GATE)
Motor brake control output
(MBR)
Ready ON signal (READY)
Servo ON signal (SERVO)
Emergency stop (EMG)
1st axis (dynamic brake stop)
2nd axis (deceleration control)
3rd axis (deceleration control
+ drop prevention control)
Contactor control output (MC)
0
0
0
MC shutoff
enable
Speed
MC shutoff
enable
Speed
MC shutoff
enable
Speed
ON
OFF
Drop prevention
Shutoff after confirmation
of all axes enable
OFF
ON