6
6-41
6-10 Forward and Reverse Drive Prohibition Functions
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
Applied Functions
Drive Prohibition Input Selection (Pn504)
Install limit switches at both ends of the axis to prohibit the Servomotor from driving in the direction specified
by the switch. This can be used to prevent the workpiece from driving too far and thus prevent damage to
the machine. Set the operation to be performed upon forward and reverse drive prohibition input.
Stop Selection for Drive Prohibition Input (Pn505)
Set the deceleration and stop methods upon a forward or reverse drive prohibition is input.
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 immediate stop torque is set for deceleration and servo lock is set for stop (set value: 2),
torque limit during deceleration will be limited with the set value of the Immediate Stop Torque
(Pn511).
Drive
Prohibition
Input Selection
(Pn504)
Explanation
0
Forward drive prohibition input and reverse drive prohibition input enabled.
The operation when a signal is input will be as follows.
Forward drive prohibition input shorted: Forward limit switch not operating and status normal.
Forward drive prohibition input open: Forward direction prohibited and reverse direction permitted.
Reverse drive prohibition input shorted: Reverse limit switch not operating and status normal.
Reverse drive prohibition input open: Reverse direction prohibited and forward direction permitted.
The Servomotor will decelerate and stop according to the sequence set in Stop Selection
for Drive Prohibition Input (Pn505). For details, refer to explanation for Stop Selection for
Drive Prohibition Input (Pn505).
If the forward and the reverse prohibition inputs are both open, an error will be detected in
the driver, and a drive prohibition input error (Err380) will occur.
1
Forward and reverse drive prohibition input disabled.
2
Forward and reverse drive prohibition input enabled.
If either the forward or the reverse prohibition input is open, a drive prohibition input error
(Err380) will occur.
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
Clear before and
after deceleration.
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 unlocked
Servo locked
0
1
2