Mitsubishi Electric MELSEC iQ-FX5 User Manual page 629

• Backlash compensation after the driver home position return method
When "[Pr.11] Backlash compensation amount" is set in the Simple Motion module, whether the backlash compensation is
necessary or not is judged from "[Pr.44] Home position return direction" of the Simple Motion module in the axis operation
such as positioning after the driver home position return. When the positioning is executed in the same direction as "[Pr.44]
Home position return direction", the backlash compensation is not executed. However, when the positioning is executed in the
reverse direction against "[Pr.44] Home position return direction", the backlash compensation is executed.
Note that the home position return is executed based on the home position return direction of the parameter of the AlphaStep/
5-phase during the driver home position return. Therefore, set the same direction to "[Pr.44] Home position return direction" of
the Simple Motion module and the home position return direction of the parameter of the AlphaStep/5-phase.
[Operation chart]
The machine home position return is started.
(The home position return is executed based on the positioning pattern set in the AlphaStep/5-phase.)
Machine home position
OFF
return start
(Positioning start signal)
Home position return
OFF
request flag
([Md.31] Status: b3)
Home position return
OFF
complete flag
([Md.31] Status: b4)
Standby
[Md.26] Axis operation
status
[Md.20] Feed current value
[Md.21] Machine feed value
■Servo OFF
• For 5-phase (open loop control configuration), if the motor is moved by an external force when servo OFF occurs, it is not
possible to detect the position and position information is not updated.
• Do not rotate the motors during servo OFF. If the motors are rotated, a position displacement occurs.
• For 5-phase (open loop control configuration), the "Home position return request flag" ([Md.31] Status: b3) turns ON in a
servo OFF state. After turning servo ON, perform a home position return again.
• For 5-phase (open loop control configuration), when an encoder is installed, checking position displacement and
maladjustments is possible by monitoring "position feedback" and "external encoder counter value" in the optional data
monitor. Refer to the manual of AlphaStep/5-phase for the units and increase direction of the encoder count value, and
checking methods.
■Control mode
Position control mode (position control, and speed control including position loop) can be used. Speed control mode and
torque control mode of expansion control (speed control not including position loop, torque control, continuous operation to
torque control) cannot be used. If a control mode switch is performed, the warning "Illegal control mode switching" (warning
code: 09EAH) occurs and the switching is not executed.
V
ON
ON
Home position return
Inconsistent
t
ON
Standby
Home position address
Appendix 2 Compatible Devices with SSCNETIII(/H)
A
APPENDICES
627