Chapter 7 Absolute Position Detection System; Outline; Characteristics; Restrictions [G] - Mitsubishi Electric MELSERVO MR-J5 Series User Manual

7
ABSOLUTE POSITION DETECTION SYSTEM
Precautions
• If [AL. 025 Absolute position erased] or [AL. 0E3 Absolute position counter warning] occurs, execute homing again.
• For the replacement procedure of the battery, refer to the following.
Page 311 Battery
• When the servo motor that requires a battery for the absolute position detection system is used, disconnection of the
encoder cable or replacement of the battery while the control circuit power supply is off causes the encoder to erase the
absolute position data. If the absolute position data is erased, execute home position setting before operation.
• When the battery is used out of specification, the absolute position data may be erased.
7.1

Outline

Characteristics

The encoder consists of a circuit designed to detect a position within one revolution and the number of revolutions.
The absolute position detection system always detects and memorize the absolute position of the machine, regardless of
whether the controller power is on/off. Therefore, once homing is performed at the time of machine installation, homing is not
needed when power is switched on thereafter.
Even if a power failure or a malfunction occurs, the system can be easily restored.

Restrictions [G]

The absolute position detection system cannot be configured in the following conditions.
• When an incremental type encoder is being used
• When semi closed/fully closed switching is enabled
• Stroke-less coordinate system (except degree unit setting) for infinite positioning and the like in combination with a
controller other than a Mitsubishi Electric controller

Restrictions [B]

The absolute position detection system cannot be configured in the following conditions.
• When an incremental type encoder is being used
• When semi closed/fully closed switching is enabled
• When a controller that does not support the infinite feed function is used in a stroke-less coordinate system such as a
degree axis

Restrictions [A]

The absolute position detection system cannot be configured in the following conditions.
• When an incremental type encoder is being used
• Speed control mode and torque control mode
• Infinite long positioning and the like, stroke-less coordinate system
• Changing electronic gear after homing
The absolute position detection system by DIO cannot be configured in the following conditions.
• Control switching mode (position/speed, speed/torque, and torque/position)
The test operation cannot be performed in the absolute position detection system by DIO. To perform the test operation,
select the incremental system in [Pr. PA03].
7 ABSOLUTE POSITION DETECTION SYSTEM
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7.1 Outline