Contactor Power On Sequences; Contactor Shutoff Sequences - Mitsubishi MELDAS MDS-C1 Instruction Manual

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 (TE3: MC1) of the power supply unit is used. Each interface voltage of the main
circuit power supply (L1/L2/L3) is checked. If voltage is applied on any voltage (if the contactor is
melted), contactor melting (alarm 6A) is detected.
Control power supply (L11/L21)
Main circuit power supply (L1/L2/L3)
Contactor control terminal (MC1)
Emergency stop from NC (EMG)
POINT

2-7-2 Contactor shutoff sequences

When an emergency stop or servo alarm occurs, the NC confirms the zero speed (motor stop or
dynamic brake operation) for all axes, and then shuts off the contactors.
If MC shut off enabled is not output, a contactor shutoff signal will be output in 30 seconds from the
power supply unit's CN23 connector to forcibly shut off the MC1 terminal. The spindle will coast after
that.
Emergency stop (EMG)
1st axis
(dynamic brake stop)
2nd axis
(deceleration control)
3rd axis
(deceleration control + drop
prevention control)
MC1 (When normal)
MC1 (during NC emergency
stop error)
(CN23 operates)
2. Wiring and Connection
ON
OFF
ON
Cancel

Contactor power ON sequences

The parameters must be set when controlling the contactor (MC1)
Cancel
ON
Speed
0
Speed
0
Speed
0
OFF
Output
OFF
Output

Contactor shutoff sequences

Contactor fusion check
Drop prevention
After 0rpm confirmation
30s
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