Ot Detection: Sequence Output Signal (Reference Value 20) - Fuji Electric ALPHA7 User Manual

OT detection: Sequence output signal (Reference value 20)

This signal is output if the over-travel (OT) signal is turned off.
 Function
The OT detection ("20") sequence output is issued while the +OT (7) or -OT (8) sequence input
signal terminal remains turned off.
In addition, OT detection ("20") is turned on if the current position reaches the reference value of
the software OT detection position.
The software OT function can be enabled or disabled with the parameter PA2_25 (software OT
selection/position command format) setting.
 Parameter setting
To assign the OT detection to IQ area (sequence output terminal), specify the corresponding value
("20") to the output terminal function setting parameter.
 Relevant description
(1) +OT detection (38)/-OT detection (39)
A + OT signal is detected during servomotor travel in the positive direction, while a - OT signal is
detected during travel in the negative direction.
Use sequence output signals to notify the host controller of detection of the + OT or - OT signal.
Connect to the host controller in general if the host controller is equipped with OT inputs.
(2) Software OT
Set PA2_25 (software OT selection) at "1" (enable) (VS type only) to limit the position range of
motion between (PA2_26 (positive software OT detection position)) and (PA2_27 (negative
software OT detection position)).
This function is valid following homing or position preset.
If the range is exceeded, the motion is forcibly stopped with the OT detection ("20") sequence
output turned on.
Supply pulse inputs in the direction opposite to the detection direction or perform manual feed
(forward/reverse command) to return to the range. The signal will be turned off and movement in
both directions will be possible.
The + OT (or - OT) sequence input is mechanical position detection, while software OT is position
detection of the servo amplifier. Software OT to reverse the homing motion shall not be applied.
Movable range
PA2_27:Negative software OT
detection position
PA2_26: Positive software OT
detection position
Description of I/O Signals
CHAPTER 2 WIRING
Feedback position
2-91
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