sh030051g.pdf - 第297页
12 - 2 12. ABSOLUTE POSITION DET ECTION SYSTEM 12.2 Specifications POINT Replace the battery wi th only the control circuit power ON. Removal of the battery with the control circuit po wer OFF will erase the ab solute po…
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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
P
o
s
i
t
i
o
n
c
o
n
t
r
o
l
s
p
e
e
d
c
o
n
t
r
o
l
High speed serial
communication
Servo motor
1 pulse/rev accumulative revolution counter
Within one-revolution counter
MR-J3BAT
Battery
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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
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12. ABSOLUTE POSITION DETECTION SYSTEM
12.3 Battery installation procedure
WARNING
Before installing a battery, turn off the main circuit power while keeping the control
circuit power on. Wait for 15 minutes or more (20 minutes or for drive unit 30kW or
more) until the charge lamp turns off. Then, confirm that the voltage between P(
)
and N(
) (L and L for drive unit 30kW or more) is safe with a voltage tester
and others. Otherwise, an electric shock may occur. In addition, always confirm
from the front of the servo amplifier whether the charge lamp is off or not.
POINT
The internal circuits of the servo amplifier may be damaged by static electricity.
Always take the following precautions.
Ground human body and work bench.
Do not touch the conductive areas, such as connector pins and electrical parts,
directly by hand.
Before starting battery changing procedure, make sure that the main circuit
power is switched OFF with the control circuit power ON. When battery is
changed with the control power OFF, the absolute position data is lost.
(1) For MR-J3-350B or less
MR-J3-200B4 or less
POINT
For the servo amplifier with a battery holder on the bottom, it is not possible to
wire for the earth with the battery installed. Insert the battery after executing
the earth wiring of the servo amplifier.
Insert connector into CN4.