Servo On/Off - Mitsubishi FX3U-20SSC-H User Manual

FX -20SSC-H Positioning Block User's Manual
3U
3. Absolute position lost
If the absolute position in the encoder becomes indefinite in the absolute position detection system, the
absolute position loss signal (ABSV) turns ON. At ABSV signal ON, make sure to operate zero return
immediately to establish the zero-point again.
The absolute position becomes indefinite in the three cases below.
• When the absolute position detection system is set by the parameter setting of the servo amplifier, and the
servo amplifier turns ON.
• An absolute position loss alarm (AL-25) is caused.
• An absolute position counter warning (AL-E3) is issued.
Note
While the absolute position loss signal (ABSV) is ON, do not start automatic operation. The zero-point must
be established to prevent unpredictable behavior.
Zero return complete
Losing an absolute
position
*1. The zero return completion flag turns ON when mechanical zero return operation is completed, or
when the current position is established by the absolute position detection system.
This flag turns OFF in the following cases.
- When the mechanical zero return command is set to ON from OFF
- When the power is turned OFF (The flag is reset.)
- When the absolute position is lost in the absolute position detection system
- When the rotation direction (servo parameter) is selected in the absolute position detection system
7.9.5

Servo ON/OFF

The servo of the servo amplifier connected with 20SSC-H turns ON/OFF.
The servo ON enables the servomotor operations.
In the 20SSC-H Ver. 1.30 or later, it is possible to set the servo ON/OFF status to be selected when the servo
amplifier is started up.
1. Servo ON/OFF
• Turn OFF(0) the servo-OFF command to turn the servo on.
• Turn ON (1) the servo-OFF command to turn the servo off.
Servo OFF Operation
command command 2
READY/BUSY Status information BFM #28 b0
Servo ON Servo status
Note
• Perform servo-ON/OFF while the servomotor is stopped.
• The servo can be turned OFF with Ready-ON in the status information.
The servo-OFF command in the following states is invalid.
- During positioning operation
- When STOP command state is ON
• If the servomotor turns due to an external force during servo-OFF, a follow-up process occurs with the
follow-up function.
*1
Status information BFM #28 b3
Servo status BFM #64 b14
→ For servo ON/OFF selection at startup, refer to Subsection 7.9.6
→ For the parameters, control data and monitor data, refer to Chapter 11
BFM Number
X-axis
BFM #519 b8 BFM #619 b8
BFM #128 b0
BFM #64 b1 BFM #164 b1
7 Before Starting Positioning Operation
BFM Number
X-axis Y-axis
BFM #128 b3
BFM #164 b14
Y-axis
Set this to turn the servo OFF.
0: Servo ON
1: Servo OFF
Turns ON when the 20SSC-H is ready for a START command
after normal completion of positioning, or when recovering from an
error.
This bit is set when the servo is ON.
Cleared when the servo turns OFF.
→ For the follow-up function, refer to Subsection 7.9.7
7.9 Other functions
Data type
Monitor data
Monitor data
Description
115
1
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10