Mitsubishi FX3U-20SSC-H User Manual

7 Before Starting Positioning Operation
115
FX3U-20SSC-H Positioning Block User's Manual
1
Introduction
2
System configuration
3
Example Connection
4
Installation
5
Wiring
6
Memory configuration and data
7
Before starting positioning control
8
Manual control
9
Positioning Control
10
Table Operation
7.9 Other functions
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.
*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.
→ 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
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.
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.
→ For the follow-up function, refer to Subsection 7.9.7
BFM Number
Data type
X-axis Y-axis
Zero return complete
*1
Status information BFM #28 b3 BFM #128 b3 Monitor data
Losing an absolute
position
Servo status BFM #64 b14 BFM #164 b14 Monitor data
BFM Number
Description
X-axis Y-axis
Servo OFF
command
Operation
command 2
BFM #519 b8 BFM #619 b8
Set this to turn the servo OFF.
0: Servo ON
1: Servo OFF
READY/BUSY Status information BFM #28 b0 BFM #128 b0
Turns ON when the 20SSC-H is ready for a START command
after normal completion of positioning, or when recovering from an
error.
Servo ON Servo status BFM #64 b1 BFM #164 b1
This bit is set when the servo is ON.
Cleared when the servo turns OFF.

Mitsubishi FX3U-20SSC-H Specifications

General

Brand	Mitsubishi
Model	FX3U-20SSC-H
Category	Controller
Language	English