Using The /P-Det (Polarity Detection) Signal To Perform Polarity Detection; Detection - YASKAWA SGD7S Product Manual

5.11 Polarity Detection

5.11.3 Using the /P-DET (Polarity Detection) Signal to Perform Polarity Detection

5.11.3 Using the /P-DET (Polarity Detection) Signal to Perform
Polarity Detection
You can allocate the /P-DET (Polarity Detection) signal if you want to create a sequence on the
host computer to monitor the /S-RDY (Servo Ready) signal and output the /S-ON (Servo ON)
signal, or if you want to perform polarity detection at times other than when the /S-ON signal
turns ON.
On the rising edge of the /P-DET signal, the servo will turn ON and polarity detection will be
performed once. As soon as polarity detection is completed, the servo will turn ON and the /S-
RDY (Servo Ready) signal will turn ON. After polarity detection has been completed, it will not
be executed again even if you turn ON the /P-DET signal.
Type
Input
Note: You must allocate the /P-DET signal to use it. Use the following parameters to allocate signals.
Refer to the following section for details.
Important
/P-DET (Polarity Detection) signal
/S-RDY (Servo Ready) signal
5-30
Signal Connector Pin No.
CN1-40
/S-ON
(default setting)
/P-DET Must be allocated.
• Pn50A = n.1 (Change the sequence input signal allocations.)
• Pn50D = n.X (/P-DET (Polarity Detection Input) Signal Allocation)
6.1.1 Input Signal Allocations on page 6-4
When the /P-DET (Polarity Detection) signal is set to be always active, polarity detection will auto-
matically start when the main circuit power supply is turned ON. This can result in unexpected
operation of the Servomotor. Always implement safety measures when you preform polarity

detection.

OFF
Polarity detection in progress
/S-ON (Servo ON) signal
Power not supplied.
Motor power status
Signal
Status
ON Turns ON the servo (supplies power to the motor) and
(closed) enables operation.
OFF Turns OFF the servo (stops power supply to the
(open) motor) and disables operation.
Executes polarity detection, but only on the first rising
ON
edge of the signal after the power supply is turned
(closed)
ON.
OFF
–
(open)
ON
OFF
Completion of polarity detection
 Normal operation is enabled.
 Status display: P-dt
OFF
Power supplied.
Power supplied.
Meaning
ON
ON