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5.ABSOLUTE POSITION DETECTION SYSTEM
(1) Restrictions on absolute position detection system
An absolute position detection system cannot be built under the following conditions:
1) Speed control or torque control operation
2) Control change mode (position/speed, position/torque)
3) Stroke-less coordinate system, e.g. rotary shaft, infinite positioning.
4) Restart after instantaneous power failure is made valid for operation.
5) Use of alarm code output
(2) Specifications
Item
System
Battery
Encoder resolution
Maximum revolution range
(Note 1) Maximum speed at power failure
(Note 2) Battery backup time
(Note 3) Data holding time during battery
replacement
Battery storage period
Note: 1. Maximum speed available when the shaft is rotated by external force at the
time of power failure or the like.
2. Time to hold data by a battery with power off.
3. Period during which data can be held by the super capacitor in the encoder
after power-off, with the battery voltage low or the battery removed, or during
which data can be held with the encoder cable disconnected. Battery
replacement should be finished within this period.
(3) Structure
1) Components
Component
Servo amplifier
Servo motor
Battery
Encoder cable
General-purpose
programmable controller
Electronic battery backup system
1 piece of lithium battery (primary battery, nominal + 3.6V)
Refer to (2) in Section 10-1.
Approx. 10,000 hours (battery life with power off)
2 hours at delivery, 1 hour in 5 years after delivery
5 years from date of manufacture
Use standard models.
MR-BAT or A6BAT
Use a standard model.
When fabricating, refer to (2), Section 6-1-2.
Use I/O unit (3 input points, 2 output points) to transfer absolute
position detection data.
Description
Type: MR-BAT or A6BAT
Home position ± 32767 rev.
500r/min
Description
5– 2
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