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Reference
If this parameter is set to 0 and the forward and reverse prohibition inputs are both open, a drive
prohibition input error (Alarm No.38) occurs because it is taken that Servo Drive is in error
condition.
If this parameter is set to 2, a drive prohibition input error (Alarm No.38) occurs when the
connection between either the forward or reverse prohibition input and COM is open.
If a limit switch above the workpiece is turned OFF when using a vertical axis, the upward torque
decreases, and there may be repeated vertical movement of the workpiece. If this occurs, set the
Stop Selection for Drive Prohibition Input (Pn505) to 2 or perform limit processing using the Host
Controller rather than using this function.
Pn505
Stop Selection for Drive Prohibition Input
Setting
0 to 2
range
Set the drive conditions during deceleration and after stopping, when the Forward or Reverse drive
prohibition input is enabled.
Refer to "6-2 Forward and Reverse Drive Prohibition Functions (P.6-6)".
The dynamic brake is rated for short-term operation. Use it only for emergency stopping. Design
the system to stop for at least three minutes after the dynamic brake operates. Otherwise, the
dynamic brake circuits may fail or the dynamic brake resistor may burn.
Explanation of Set Values
Set value
During deceleration
0
After stopping: Torque command is 0 for the drive prohibition direction. Hold the error
counter.
During deceleration: Free-run, Clear the error counter.
1
After stopping: Torque command is 0 for the drive prohibition direction. Hold the error
counter.
During deceleration: Emergency stop
2
After stopping: Both torque command and torque limit are as specified. Clear the error
counter after deceleration completes, then hold it.
*1. 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 "after stopping", regardless of the actual speed.
*2. 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.
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 creates 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 command warning (Warning No. 95) occurs, if a command is given to the drive prohibition
direction while the Servomotor stops (or decreases the speed to 30 r/min or lower) and the Drive
Prohibition Input is on.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Unit
Explanation
*1
: Dynamic brake operation, Clear the error counter.
*2
, Hold the error counter.
8-6 Extended Parameters
Default
Data
0
setting
attribute
All
C
8
8-42
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