6
6-8
6-2 Forward and Reverse Drive Prohibition Functions
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Applied Functions
Stop Selection for Drive Prohibition Input (Pn505)
Set the deceleration and stop methods upon a forward or reverse drive prohibition is input.
Precautions for Correct Use
At an emergency stop, an Error counter overflow (Alarm No.24.0) or an Overrun limit error (Alarm
No.34.0) may occur. This is because the emergency stop forces the motor to decelerate quickly,
and the position control produces a large positional deviation momentary. If the error occurs, set
the Error Counter Overflow Level (Pn014) and the Overrun Limit Setting (Pn514) in appropriate
values.
A load on the vertical axis and so forth may fall due to its own weight in the drive prohibition input
state. To prevent the load from falling, set emergency stop torque for deceleration and servo lock
for stop (set value: 2) in Stop Selection for Drive Prohibition Input (Pn505), or limit the operation
using the Host Controller rather than using this function.
A command warning (Warning No. 95) occurs, if a command is given to the drive prohibition
direction while the Servomotor stops (when decelerated to 30 r/min or lower) and the Drive
Prohibition Input is ON.
Pn504 set
value
*1
Pn505
set value
Decelerating
*2
After stopping
Deceleration method
Error
counter
Operation after stop
Error
counter
0
0 Dynamic brake Clear
Torque command = 0 for
drive prohibition direction
Held
1 Free-run Clear
Torque command = 0 for
drive prohibition direction
Held
2 Emergency stop
*3
Held
Torque command and
Torque limit are as
specified.
Cleared after
deceleration
completes,
then held.
*1.While the Drive Prohibition Input Selection (Pn504) is set to 2, a Drive prohibit input error (Alarm
No.38.0) occurs as soon as either the Forward or Reverse Drive Prohibition Input is on. The
subsequent operation conforms not to the set value but to the setting on the Stop Selection for Alarm
Detection (Pn510). It is the same when any other errors occur. The operation by the Stop Selection for
Alarm Detection (Pn510) has the priority.
*2.The term "During deceleration" means the distance till the motor decreases its speed to 30 r/min or less
from the normal operation. Once it decelerates to 30 r/min or lower speed, the operation conforms to
the description for “post-stopping”, regardless of the actual motor speed.
*3.The "Emergency Stop" means that the Servomotor stops immediately by control while the Servo-ON
state is kept. The torque limit at this time is controlled by the Emergency Stop Torque (Pn511) set
value.
Stop Selection for Drive
Prohibition Input (Pn505)
POT (NOT) is turned OFF.
Deceleration method
Decelerate with dynamic brake
Decelerate in the free-run status
Decelerate with
Emergency Stop Torque (Pn511)
Stop status
Servo free
Servo locked
0
1
2
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