NSK Megatorque PS Series, User Manual

Page: 207 / 370

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8.8.1. Home Return Operation via the Home Position Sensor
8.8.1.1. Home Return Mode: OS4
The OS4 mode is to reverse the Motor position to the position of the nearest phase Z signal after
detection of rising signal of the input HLS (Home position limit).
The repeatability of the home position is assured regardless of the sensitivity of the home
position limit because the position of the phase Z signal finally determines the home position.
Fig 8-26: Signal timing of Home Return Operation (Incase of OS4, DI0 and HD1)
Motor motion
Max. 170 ms (Max. 3.2 s)
Note*
ON
OFF
closed
open
Input SVON
Output SVST
HV
Detection of signal rising edge starts the operation.
Min. 1ms
Max. 0.5 ms Max. 1 ms
Input HOS
ON
OFF
closed
open
Output BUSY
closed
open
Output IPOS
(FW <
0: CFIN
)
closed
open
Output IPOS
(FW
> 0: FIN )
HA
Clsed when the tareget position is sucred.
Opens when the target position is lost.
HB
HA
HB
closed
open
closed
open
Positioning completed
.
FW value
Output HOME
Output HCMP
HZ
HO
HB
HA
Input HLS
ON
OFF
Output Phase Z
1)
2)
3)
4)
5)
6) 7)
8)
Note*: It requires 3.2 seconds for the first
servo on after the power is on.
CCW
CW
1) Turn ON the input SVON (Servo on) to activate the Motor servo.
2) The output SVST (Servo state) closes when the Motor servo activates.
3) Activation of the input HOS (Home Return start) from OFF to ON starts the Home
Return operation.
The Motor starts in the direction set by the parameter HD (Home Return direction) that
follows the current direction setting of scale system.
(The parameters are set to DI0 and HD1 in the above figure.)
The Motor rotates in accordance with the settings of parameter HA (Home Return
acceleration), HB (Home Return deceleration) and HV (Home Return velocity).