4.10 Controlling Vertical Axes
4-43
Feed Axis
Operation
4.10
Controlling Vertical Axes
When the power supply to a servo for a vertical axis (including inclined axes) is turned OFF, gravity will cause
any moving parts (such as the table or workpiece) to move.
Refer to the following figure.
Use a servomotor with a holding brake to prevent these parts from moving. The holding brake of the servomo-
tor is controlled through the brake output (/BK) signal from the SERVOPACK.
This can be controlled from the host controller, but because the timing for when to apply the brake depends on
when the servo is turned ON or OFF or when a SERVOPACK alarm occurs, we recommend using the SER-
VOPACK’s holding brake function instead.
Refer to
8.2.2 (4) Overtravel Warning Function
in the
Σ
-V-SD Series User’s Manual
(Manual No.: SIEP
S800000 78) for details on the holding brake.
Vertical Axes
Servomotor
Holding brake
Prevents movement due
to gravity when the power
supply is turned OFF.
Moving part
Axis with External Force
External force
Moving part
Servomotor
Holding
brake
Prevents movement of the
table due to external forces.
