10-2
ABSOLUTE POSITION SYSTEM
- SV Series User’s Manual -
10-1 Overview and Specifications
This section describes overview and specifications of absolute position system and how to use.
Overview
Absolute type servo motor (SV-A) consists of a detector that detects position within one revolution and
accumulative revolution counter.
When using the absolute position system, current position of encoder can be kept by a lithium battery with battery
case (SV-B1), even if power supply of control circuit is OFF.
• Incremental servo motor can not use the absolute position system.
• When absolute position system is not used, current coordinate will be reset once power is ON. Be sure to
perform origin return first you start if required.
Specification
Specifications of absolute position system are listed in the following table.
Current position
(Absolute position)
Servo motor*
Lithium battery with
battery case (SV-B1)
Rotary
accumulation
counter
Within 1 revolution
position
Rotary
accumulation
counter
Encoder
Encoder cable
*Absolute encoder
Servo amplifier
Within 1 revolution
position
Item Specification Comments
Mode
Electronic/battery backup
mode
-
Battery Special Lithium battery
Lithium battery with battery case (SV-B1) and backup lithium
battery (OP-51422)
Max. rotation range
-
32768 to 32767 turns -
Battery backup time 20000 hours The power is OFF and ambient temperature 25°C.
Storage years for battery 5 years -
Recommended time for
replacing battery
3 years
It means the recommended replacing time for maintaining
battery function whether power ON or OFF.
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