Overtravel Function And Settings; Overtravel Signals - YASKAWA SGD7C-***AMAA*** Product Manual

5.11 Overtravel Function and Settings

5.11.1 Overtravel Signals

5.11

Overtravel Function and Settings

Overtravel is a function of the SERVOPACK that forces the Servomotor to stop in response to a
signal input from a limit switch that is activated when a moving part of the machine exceeds the
safe range of movement.
The overtravel signals include the P-OT (Forward Drive Prohibit Input) and the N-OT (Reverse
Drive Prohibit Input) signals. You use the P-OT and N-OT signals to stop the machine by install-
ing limit switches at the positions where you want to stop the machine that is operated by the
Servomotor.
A SERVOPACK wiring example is provided below.
Using the overtravel function is not necessary for rotating applications such as rotary tables
and conveyors. No wiring for overtravel input signals is required.
This section describes the parameters settings related to overtravel.

5.11.1 Overtravel Signals

The overtravel signals include the P-OT (Forward Drive Prohibit Input) and the N-OT (Reverse
Drive Prohibit Input) signals.
Type
Input
You can operate the Servomotor in the opposite direction during overtravel by inputting a refer-
ence.
5-28
Rotary ervomotor
ervomotor
Limit
Limit
witch
witch
 To prevent accidents that may result from contact faults or disconnections, use normally
closed limit switches.
Do not change the default settings of the polarity of the overtravel signals (P-OT and N-OT).
 If you use a Servomotor for a vertical axis, the /BK (Brake Output) signal will remain ON (i.e.,
the brake will be released) when overtravel occurs. This may result in the workpiece falling
when overtravel occurs. To prevent the workpiece from falling, set Pn001 to n.
place the Servomotor in a zero-clamped state when it stops.
 A base block state is entered after stopping for overtravel. This may cause the Servomotor
to be pushed back by an external force on the load shaft. To prevent the Servomotor from
being pushed back, set Pn001 to n.
when it stops.
Signal Connector Pin No.
Axis A: CN1-3
P-OT
Axis B: CN1-9
Axis A: CN1-4
N-OT
Axis B: CN1-10
Linear ervomotor
Forward direction of motor
ERVOPACK
CN1
N-OT
4, 10
P-OT
, 9
CAUTION
 
1 to place the Servomotor in a zero-clamped state
Signal
ON Forward drive is enabled (normal operation).
Forward drive is prohibited (forward over-
OFF
travel).
ON Reverse drive is enabled (normal operation).
Reverse drive is prohibited (reverse over-
OFF
travel).
ervomotor
Forward direction
ERVOPACK
CN1
Limit Limit
N-OT
4, 10
witch witch
P-OT
, 9

Meaning

1 to