Origin Search Operation - Omron CJ1W-NC271 - 12-2009 Operation Manual

Origin Search Operation

8-2-4 Origin Search Operation
Origin Search
Operation Summary
1,2,3...
Origin proximity
input signal
Origin input signal
(Phase Z signal)
Speed
Origin search direction
Note
Basically, the PCU's origin search operation consists of the following three
steps.
1. Search for origin proximity signal
2. Search for origin signal after detection of origin proximity signal
3. Positioning for final travel distance to return to zero point after detection of
origin signal
Each of these steps is executed using the operation direction and speed
according to the Axis Parameters, Servo Parameters, and speed command
value for origin search as shown in the following diagram.
The origin proximity signal is not always used in the origin search operation
pattern and an origin search can be started at the zero point return approach
speed. For details on origin search operation patterns, refer to Origin Search
Operation Modes on page 306.
1
0
1
0
Speed command value
Zero point return approach speed 1 (Pn817)
Start
(1) (2)
Zero point return direction (Pn816)
Origin search direction (See note.)
(Axis Parameters)
(1) The operation direction for origin search is determined by the setting in
Servo Parameter Zero Point Return Direction (Pn816).
(2) The parameters shown above are different for G-series Servo Drives.
Make sure that the same direction is set for Origin Search Direction in the Axis
Parameters and Zero Point Return Direction (Pn816) in the Servo Parame-
ters. Setting different directions may result in a malfunction.
The override function is disabled during origin searches.
The parameter Final Travel Distance to Return to Zero Point (Pn819) sets the
amount of compensation positioning used after the origin input signal has
been detected. The value is set as the relative travel distance in the origin
search direction.
When Final Travel Distance to Return to Zero Point (Pn819) is set to a nega-
tive or small value, the axis will decelerate to a stop, and then reverse and per-
form the set positioning.
Zero point return approach speed 2 (Pn818)
Final travel distance to return to zero point (Pn819)
Origin search direction
Stop
(3)
Section 8-2
305