Mitsubishi Electric MELDAS C6 Interface Manual page 151

B con-
Signal name
tact
—
SPINDLE CURRENT DETECT CDO
[Function]
This signal is output from the high-speed serial connection specification spindle controller (spindle
drive) and informs that drive motor current is about to reach the permissible maximum current. The
signal can be used to prevent stabbing of cutter into workpiece, for example.
[Operation]
The signal (CDO) turns ON if motor current goes up to a level (110% output) close to the
permissible maximum current (120%).
(Note 1) This signal is valid only for the system that is high-speed serially connected with the
spindle controller.
B con-
Signal name
tact
—
SPINDLE SPEED DETECT
[Function]
This signal is output from the high-speed serial connection specification spindle controller (spindle
drive) and informs that motor speed drops below the speed specified by parameter.
[Operation]
The signal (VRO) turns ON when motor speed (motor rotation speed) drops below the speed
specified by parameter "#3220 SP020 (speed detection set value)".
The speed level at which the signal is output can be set within range from 1% to 120% (standard
setting: 10%) with the spindle parameters.
Spindle motor speed
Spindle speed detect (VRO)
(Note 1) This signal is valid only for the system that is high-speed serially connected with the
spindle controller.
6. EXPLANATION OF INTERFACE SIGNALS
6.1 PLC Input Signals (Bit Type: X***)
Signal
abbreviation
Signal
abbreviation
VRO
6-1-62
1st spindle 2nd spindle
X991 X9C1
1st spindle 2nd spindle
X992 X9C2
Speed command level
(SP020)
3rd spindle
X9F1
3rd spindle
X9F2