Summa Series Servodrive Product Manual
Application Functions
Document Version: V1.01
(Dec, 2019)
© 2019 ESTUN Automation Co., Ltd. All right reserved.
7-3
7.3
Overtravel Limit
7.3.1
Function Description
Overtravel is a safety function of the Drive that forces the Motor 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) and the N-OT (Reverse Drive Prohibit)
signals.
You use the P-OT and N-OT signals to stop the machine by installing limit switches at the positions
where you want to stop the machine that is operated by the Motor.
An example of wiring for the P-OT signal and the N-OT signal is shown in Figure 7-1.
Figure 7-1
Wiring diagram for the overtravel
Motor forward direction
Drive
Motor
Limit
switch
Limit
switch
N-OT
P-OT
16
15
CN1
Using the overtravel function is not necessary for rotating applications such as rotary tables and
conveyors. No wiring for overtravel input signals is required.
CAUTION
To prevent accidents that may result from contact faults or
disconnections, use normally closed limit switches.
Moreover, never change the default settings of the polarity of the
overtravel signals (P-OT and N-OT).
When using the Motor on a vertical axis, the workpiece may fall in the
overtravel condition. To prevent this, always set the zero clamp after
stopping with Pn003.1=2.
7.3.2
Connecting the Overtravel Signal
To use the overtravel function, connect the following overtravel limit switch input signal terminals.
Type
Name
Pin
Setting
Meaning
Input
P-OT
CN1-16
ON
Forward run allowed. Normal operation status.
OFF
Forward run prohibited. Forward overtravel.
N-OT
CN1-15
ON
Reverse run allowed. Normal operation status.
OFF
Reverse run prohibited. Reverse overtravel.
