Contactor Power On Sequences; Contactor Shutoff Sequences - Mitsubishi Electric MELDAS MDS-R Series Technical Specification And Instruction Manual

7-7-3 Contactor power ON sequences

When using the contactor control output (CN9 connector: MC) for the MDS-R-V1/V2 servo drive unit,
the main circuit power supply is turned ON with the sequence shown below. In the 200ms interval after
the drive unit emergency stop input is canceled, the contactor contact fusion is checked by discharging
the PN bus voltage with the regenerative resistor. External contactor fusion (alarm 5F) is detected when
the contactor has fusion.
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)

7-7-4 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. If an MC shutoff enabled signal
is not output, the contactors will be forcibly shut off by the controlling unit after 30 seconds.
Emergency stop (EMG)
1st axis
(dynamic brake stop)
2nd axis
(deceleration control)
3rd axis
(deceleration control +
drop prevention control)
Contactor control output (MC)
7. Wiring and Connection
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
OFF
0

Contactor power ON sequences

OFF
ON
Speed
0
MC shutoff enable
Speed
0
MC shutoff enable
Speed
0
MC shutoff enable
ON
OFF

Contactor shutoff sequences

7 - 16
PN charging completion
Ready completion
Command input enable
500 1000
Drop prevention
Shutoff after confirmation
of all axes enable
1500 Time (ms)