7-7
7-2 Forward and Reverse Drive Prohibition Functions
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
7
Applied Functions
Drive Prohibition Input Selection (3504 Hex)
Set the operation of the Forward Drive Prohibition Input (POT) and the Reverse Drive
Prohibition Input (NOT). 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 (3505 Hex)
Set the deceleration and stop methods upon a forward or reverse drive prohibition is input.
Drive
Prohibitio
n Input
Selection
(3504 hex)
Explanation
0
Forward drive prohibition input and reverse drive prohibition input enabled.
The operation when a signal is input is as follows:
Forward drive prohibition input closed: Forward limit switch not operating and status normal.
Forward drive prohibition input open: Forward direction prohibited and reverse direction permitted.
Reverse drive prohibition input closed: Reverse limit switch not operating and status normal.
Reverse drive prohibition input open: Reverse direction prohibited and forward direction permitted.
The Servomotor decelerates and stops according to the sequence set in Stop Selection
for Drive Prohibition Input (3505 hex).
*1
If the forward and the reverse prohibition inputs are both open, a Drive Prohibition Input
Error 1 (Error No. 38.0) will occur because it is taken that Servo Drive is in error condition.
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
1 (Error No. 38.0) will occur.
*1. For details, refer to explanation for Stop Selection for Drive Prohibition Input (3505 hex).
Precautions for Correct Use
Both signals are disabled (in a state in which drive prohibition will not operation) in
the default settings. If prohibiting the drive input is required, set the Drive Prohibit
Input Selection (3504 hex) to either 0 or 2. The setting on the Input Signal
Selection 1 to 10 (3400 to 3409 hex) can change the logic and allocation for the
respective Input terminals (CN1 to 7 and 8).
3504 hex
set
value
*1
3505 hex
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 Immediate stop
*3
Clear
Torque command and
torque limit are as
specified.
Cleared after
deceleration
completes,
then held.
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