6 Applied Functions
6 - 40
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User’s Manual
Set the deceleration and stop methods used when the Forward/Reverse Drive Prohibition Input signal
turns ON.
While the Forward Drive Prohibition Input (POT) is OFF, the Servomotor cannot be driven in the forward
direction, but it can be driven in the reverse direction. Conversely, while the Reverse Drive Prohibition
Input (NOT) is OFF, the Servomotor cannot be driven in the reverse direction, but it can be driven in the
forward direction.
If you set the Servomotor to decelerate at the immediate stop torque and stop with servo locked (set
value: 2), the torque limit during deceleration will be limited by the value set in Immediate Stop Torque
(Pn511).
Precautions for Correct UsePrecautions for Correct Use
• A load on the vertical axis and so forth may fall due to its own weight when the Drive
Prohibition Input is ON. To prevent this, set the Servomotor to decelerate at the immediate
stop torque and stop with servo locked (set value: 2) in the Stop Selection for Drive Prohibition
Input (Pn505), or limit the operation using the host controller instead of this function.
• Because an immediate stop causes the motor to decelerate quickly, in the position control
mode, the position error may become large momentarily, resulting in a Error Counter Overflow
(Alarm No. 24.0) or Overrun Limit Error (Alarm No. 34.0). To prevent this, set Error Counter
Overflow Level (Pn014) and Overrun Limit Setting (Pn514) to appropriate values.
Stop Selection for Drive Prohibition Input (Pn505)
Stop
Selection for
Drive
Prohibition
Input (Pn505)
Deceleration method After stopping Error counter
0 Dynamic brake Torque command = 0 for drive
prohibition direction
Held
1 Free-run
(Torque command = 0 for drive
prohibition direction)
Torque command = 0 for drive
prohibition direction
Held
2 Immediate stop Servo lock Cleared before and
after deceleration
Stop Selection for
Drive Prohibition
Input (Pn505)
POT (NOT) is OFF.
Deceleration method
Decelerate with dynamic brake
Decelerate in the free-run status
Decelerate with Immediate
Stop Torque (Pn511)
Stop status
Servo unlocked
Servo locked
0
1
2
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