4. Servo Adjustment
4 - 35
4-5-2 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 minimum delay time at which the axis does not
drop.
2) Set the same value as the adjusted vertical axis drop prevention time (SV048) for the max. gate
off delay time after emergency stop (SV055).
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-C1-V2 (2-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 = Same value as that axis' rapid traverse acceleration/deceleration time constant
Vertical axis drop prevention control sequence
CAUTION
1. Always set deceleration control when using the vertical axis drop
prevention control setting.
2. If an alarm, for which dynamic brake stopping is designated, occurs with
the axis for which vertical axis drop prevention control is active, the function
will not activate. To prevent axis dropping under all conditions, provide
measures on the machine side by installing a balance unit, etc.
Motor brake control output (CN20)
OFF
ON
Servo READY (READY)
ON
OFF
Emergency stop (EMG)
ON
OFF
SV048
Motor brake actual operation (BRK)
OFF
ON
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