
10. INTERFACE SIGNALS
B–65162E/03
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D When the following four conditions hold, the spindle motor starts a
reverse rotation corresponding to the speed command (positive value).
- Emergency stop signal *ESPA is 1
- Machine ready signal MRDYA is 1
- Reverse rotation command signal SRVA is 1
- Contact signal ESP is connected to 24 V (at CX4 of the PSM)
D While SRVA=1, the spindle motor rotats in a clockwise direction
(CW) looked at from the shaft side according to the speed command
(Positive value).
D If SFRA = 0 occurs, the spindle motor stops by the regenerative
braking. After stopping, it cuts the power supply to the spindle motor
by intercepting the transistor excitation signal.
D When the Normal rotation command signal (SFRA) and the reverse
rotation command signal (SRVA) are simultaneiusly ON, the spindle
motor stops.
D The torque restriction (torque limit) is used in order to rotate the
spindle motor to temporarily reduce the spindle motor output torque
at such times as machine type spindle orientation.
D Set the rotation speed at orientation and the output torque at orientation
of each machine type at the machine manufacture in order to lessen
shocks even when hitting the machine stopper.
D It is possible to adjust the output torque at orientation by parameter.
D If the torque limiting command is 1, the torque limit state occurs.
Even if commanded during motor rotation it will be immediately
enabled. If the torque limit state occurs, the torque limiting signal
(TLMA) is immediately transmitted to the outside.
D At the time of performing machine type orientation at the machining
center ATC, consider the following points when designing the
magnetics cabinet sequence such that damage does not occur to the
machine stopper.
- The output torque at orientation should not be excessive.
- The rotation speed at orientation should not be excessive. For
example, when the rotation speed is excessive at the speed
detection signal, the interlock should be set such that the stopper
does not emerge.
- When the torque limit is released, the stopper should be securely
stored.
10.2.6
Reverse Rotation
Command Signal
(SRVA)
10.2.7
Torque Limiting
Command Signal
(TLMLA, TLMHA)