Mitsubishi Electronics MDS-R Manuel D’Utilisation

 
 
 

 

 

9 - 31

 
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 ready OFF from the servo drive unit by the time set in the 
parameters when an emergency stop occurs. 
 
(1)  Operating conditions  

<1> The emergency stop signal has been input. 
<2> The NC power has been turned OFF. 
<3> An alarm for which deceleration control is set as the stopping method has occurred. (This 

differs according to the occurring alarm. Refer to "10-3-1 Alarm list" for details.) 

 

 

 

This drop prevention function does not prevent the axis from dropping under all 
conditions. To prevent the axis from dropping under all conditions, take measures 
on the machine such as installing a balance unit. 

 

While stopped ....... The drive unit enters the ready OFF state after the vertical axis drop prevention 

time (SV048) has elapsed.  

While moving......... Deceleration stop is carried out, and the drive unit enters the ready OFF state 

after the larger value of the vertical axis drop prevention time (SV048) and 
emergency stop maximum delay time (SV055) has elapsed. 

 
 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Emergency 

stop 

Brake 

operation 

Servo ON 

Tbd 

EMGrt 

Tbd: Brake operation delay time

EMGrt > Tbd 

Detect in-position 
and turn servo OFF

Emergency 

stop 

Brake 

operation 

Tbd

Tbd: Brake operation delay time

Servo ON 

Actual 
operation 

Rapid 
traverse rate 

Motor speed 

EMGx 

0

Command 

EMGt