12. ABSOLUTE POSITION DETECTION SYSTEM
12 - 2
12. ABSOLUTE POSITION DETECTION SYSTEM
If [AL. 25 Absolute position erased] or [AL. E3 Absolute position counter warning]
has occurred, always perform home position setting again. Otherwise, it may
cause an unexpected operation.
If [AL. 25], [AL. 92], or [AL. 9F] occurs due to such as short circuit of the battery,
the battery can become hot. Use the battery with case to prevent getting burnt.
Refer to section 12.3 for the replacement procedure of the battery.
When absolute position data is erased from the encoder, always execute home
position setting before operation. The absolute position data of the encoder will
be erased in the followings. Additionally, when the battery is used out of
specification, the absolute position data can be erased.
The encoder cable was disconnected.
The battery was replaced when the control circuit power supply was off.
12.1 Summary
12.1.1 Features
For normal operation, as shown below, the encoder consists of a detector designed to detect a position
within one revolution and a cumulative revolution counter designed to detect the number of revolutions.
The absolute position detection system always detects the absolute position of the machine and keeps it
battery-backed, independently of whether the servo system PC or PLC...etc power is on or off.
Therefore, once home position return is made at the time of machine installation, home position return is
not needed when power is switched on thereafter.
Even at a power failure or a malfunction, the system can be easily restored.
12.1.2 Structure
Controller Servo amplifier
Network module
Servo motor
CN2
SLOT
Battery
CN4
12.1.3 Parameter setting
Set "_ _ _ 1" in [Pr. PA03] to enable the absolute position detection system.
Absolute position detection system selection
0: Disabled (used in incremental system)
1: Enabled (used in absolute position detection system)
[Pr. PA03]
1
Programmable PC or PLC...etc
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