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7. Wiring and Connection
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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.
Contactor power ON sequences
ON
OFF
Ready ON signal (READY)
ON
OFF
Servo ON signal (SERVO)
0
500 1000 1500
Time
(
ms
)
Command input enable
OFF
ON
Motor brake control output (MBR)
Dynamic brake
OFF
ON
PN bus voltage
PN charging completion
Motor ON (GATE)
ON
OFF
Ready completion
Emergency stop (EMG)
OFF
ON
ON
OFF
Contactor control output (MC)
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.
1st axis
(dynamic brake stop)
2nd axis
(deceleration control)
3rd axis
(deceleration control +
drop prevention control)
0
0
0
MC shutoff enable
Speed
MC shutoff enable
Speed
MC shutoff enable
Speed
Contactor control output (MC)
ON
OFF
Drop prevention
Shutoff after confirmation
of all axes enable
OFF
ON
Emergency stop (EMG)
Contactor shutoff sequences