Yaskawa MP930 - Manual (Page 235)

Absolute Position Detection
7.1.2 Structure of Absolute Position Detection
7 -4
J Changes in Status in an Absolute Position Detection System
The following shows changes in status in an absolute position detection system.
Absolute encoder battery alarm
Alarm
status
3. Operating preparations
complete status
(automatic operation enabled)
Alarm reset
Zero point setting
2. Zero point incomplete status
(manual operation enabled)
Absolute encoder
initialization
Encoder alarm
Power ON
Power OFF
4. Standby status
(power OFF status)
Dead battery
1. Initialization incomplete status
(MC operation disabled)
Figure 7.1 Changes in Status in the Absolute Position Detection System
The following describes the status above in more detail.
1. Initialization Incomplete Status
Absolute encoder operation cannot be guaranteed if the encoder has this status. This alarm
will occur if this is the first time that the absolute encoder has been used or if all backup
power supplies for the absolute encoder have discharged. Be sure to initialized the absolute
encoder in these cases. The zero point cannot be set if the encoder has this status.
2. Zero Point Incomplete Status
This status indicates that the zero point setting that is needed to determine the zero point
of the machine coordinate system has not been input. In this case an alarm will be gener-
ated when the machine is turned ON so reset the alarm and then enter the zero point setting.
In zero point incomplete status, the only way to move the axis is through manual JOG and
STEP operations.
3. Operation Preparations Complete
This indicates that zero point settings were input, the Absolute Position Detection Func-
tion is enabled and the machine is ready for normal operation.
4. Standby Status
This status indicates that machine movement is being detected even though power is OFF
and data changes are being updated with absolute encoder rotation. At this time, the abso-
lute encoder is running on battery power.
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