7-9
7-3 Overrun Protection
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
7
Applied Functions
7-3 Overrun Protection
This function detects an Overrun Limit Error (Error No. 34.0) and stops the Servomotor if the
motor exceeds the allowable operating range set for the Overrun Limit Setting (3514 hex) with
respect to the position command input.
The function can also prevent the Servomotor from clash into the machine edge due to
vibration.
Operating Conditions
The overrun limit works under the following conditions.
Conditions for Clearing the Position Command Input Range
The position command input range will be cleared to zero under any of the following conditions.
 When the power supply is turned ON,
 While the position error is cleared. This includes when the servo is OFF and when the error
counter is cleared due to a deceleration stop for the drive prohibit input.
 When a trial operation via USB communications starts and when it ends.
 When the position data is initialized. This includes at a component setup request, at an origin
return, when setting the coordinate system, at an adjustment command, and when clearing a
multi-rotation data via USB.
Precautions for Correct Use
 This function is not intended to protect against incorrect position commands.
 When this function works, the Servomotor decelerates and stops according to the Fault reaction
option code (605E hex). Take this deceleration operation into account when you set the Overrun
Limit Setting (3514 hex). Otherwise, the load during deceleration may hit and cause damage to
the machine edges.
 The overrun limit function is disabled for FFT analysis from the CX-Drive.
Objects Requiring Settings
Conditions
Operating Mode Position Control Mode, Fully-closed Control Mode
Others
 Servo ON state
 The factors other than control objects must be set correctly. This includes
the torque limit. The motor must operate normally without any failures.
Index Name Description Reference page
3514 hex
Overrun Limit Setting Sets the Servomotor's allowable operating range for
the position command input range.
page 9-35
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