Vertical Axis Drop Prevention Control - Mitsubishi Electric MDS-E Series Instruction Manual

MDS-E/EH Series Instruction Manual
5 Servo Adjustment

5.5.2 Vertical Axis Drop Prevention Control

The vertical axis drop prevention control is a function that prevents the vertical axis from dropping due to a delay in
the brake operation when an emergency stop occurs. The no-control time until the brakes activate can be
eliminated by delaying the servo READY OFF state by the time set in the parameters when an emergency stop
occurs.
Always use this function together with deceleration control.
< Setting procedures >
[1] Apply emergency stop while viewing the current position on the NC screen. Adjust the vertical axis drop
prevention time (SV048), and set the 1.5-fold minimum delay time at which the axis does not drop.
When using a motor with a break, confirm that the axis will not drop at the 150ms setting, and set 200ms.
[2] Set the value of the normal acceleration/deceleration time constant plus 100ms for the max. gate off delay time
at emergency stop (SV055), and set the standard setting value of the axis for the deceleration control time
constant at emergency stop (SV056). Refer to "Deceleration Control" for details.
[3] For the axis for which the vertical drop is to be controlled, set the same value as the acceleration/deceleration
time constant for the deceleration control time constant at emergency stop (SV056).
[4] If the vertical axis is MDS-E/EH-V2/V3 (2-axis or 3-axis drive unit), set the servo parameters for the other axis
in the same unit.
SV048 = Same value as adjusted vertical axis SV048
SV055 = Same value as adjusted vertical axis SV055
SV056 = Standard setting value of SV055 for the axis (Refer to "Deceleration control" for details.)
[5] If the power supply unit that supplies PN power to the vertical axis is controlled by a spindle drive unit, set the
time for the spindle to stop from the maximum speed to the parameters SP055 and SP056.
[6] If the power supply unit that supplies PN power to the vertical axis is controlled by a different servo drive unit,
set the servo parameter setting for that axis as well. (Same as item [4] above).
[7] If the CN9 connector of the power supply unit that supplies PN power is connected with the vertical axis, also
set the parameter for the drive unit connected with the CN4 connector of the same power supply unit.
Motor brake actual operation (BRK)
IB-1501229-F
Emergency stop (EMG)
Motor brake control output （MBR)
Servo READY (READY)
Vertical axis drop prevention control sequence
ON
OFF
OFF
ON
OFF
ON
ON
OFF
SV048
300