sh030051g.pdf - 第296页
12 - 1 12. ABSOLUTE POSITION DETECTION SYSTEM 12. ABSOLUTE POSITION DETECTION SYSTEM CAUTION If an absolute position erase alarm (25) or absolute position counter warning (E3) has occurred, always perform home position s…
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11. OPTIONS AND AUXILIARY EQUIPMENT
MEMO
12 - 1
12. ABSOLUTE POSITION DETECTION SYSTEM
12. ABSOLUTE POSITION DETECTION SYSTEM
CAUTION
If an absolute position erase alarm (25) or absolute position counter warning (E3)
has occurred, always perform home position setting again. Not doing so can cause
runaway. Not doing so may cause unexpected operation.
POINT
If the encoder cable is disconnected, absolute position data will be lost in the
following servo motor series. HF-MP, HF-KP, HC-SP, HC-RP, HC-UP, HC-LP,
and HA-LP. After disconnecting the encoder cable, always execute home
position setting and then positioning operation.
12.1 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 controller 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.
If a power failure or a fault occurs, restoration is easy.
Servo system controller
Current
position
Home position data
LS0
CYC0
Servo amplifier
Position data
Detecting
the number
of revolutions
Detecting the
position within
one revolution
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High speed serial
communication
Servo motor
1 pulse/rev accumulative revolution counter
Within one-revolution counter
MR-J3BAT
Battery
12 - 2
12. ABSOLUTE POSITION DETECTION SYSTEM
12.2 Specifications
POINT
Replace the battery with only the control circuit power ON. Removal of the battery
with the control circuit power OFF will erase the absolute position data.
(1) Specification list
Item Description
System Electronic battery backup system
Battery
1 piece of lithium battery ( primary battery, nominal 3.6V)
Type: MR-J3BAT
Maximum revolution range Home position 32767 rev.
(Note 1) Maximum speed at power failure 3000r/min
(Note 2) Battery backup time Approx. 10,000 hours (battery life with power off)
Battery storage period 5 years from date of manufacture
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. It is recommended to replace the battery in three years independently of
whether power is kept on or off.
(2) Configuration
Servo motor
Servo amplifier
CN1 CN2
Battery
(MR-J3BAT)
CN4
Servo system controller
(3) Parameter setting
Set "
1" in parameter No.PA03 to make the absolute position detection system valid.
Absolute position detection system selection
0: Used in incremental system
1: Used in absolute position detection system
Parameter No.PA03