YASKAWA SGD7S series - Using the;P-DET (Polarity Detection) Signal to Perform Polarity Detection; Detection

5.11 Polarity Detection
5.11.3 Using the /P-DET (Polarity Detection) Signal to Perform Polarity Detection
5
Basic Functions That Require Setting before Operation
5-29
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.
Note: You must allocate the /P-DET signal to use it. Use the following parameters to allocate signals.
• Pn50A = n.1 (Change the sequence input signal allocations.)
• Pn50D = n.X (/P-DET (Polarity Detection Input) Signal Allocation)
Refer to the following section for details.
6.1.1 Input Signal Allocations on page 6-5
Typ e Signal Connector Pin No.
Signal
Status
Meaning
Input
/S-ON
CN1-40
(default setting)
ON
(closed)
Turns ON the servo (supplies power to the motor) and
enables operation.
OFF
(open)
Turns OFF the servo (stops power supply to the
motor) and disables operation.
/P-DET Must be allocated.
ON
(closed)
Executes polarity detection, but only on the first rising
edge of the signal after the power supply is turned
ON.
OFF
(open)
–
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.
Important
/P-DET (Polarity Detection) signal
OFF
/S-RDY (Servo Ready) signal
/S-ON (Servo ON) signal
Motor power status
Power not supplied.
OFF
ON
Power supplied.
Power supplied.
ON
OFF
ON
Polarity detection in progress
 Status display: P-dt
Completion of polarity detection
 Normal operation is enabled.