Absolute Encoder Data Backup - YASKAWA SGMJV User Manual

Note 1. After turning the power ON, turn ON the SEN signal after ALM signal is turned OFF and then ON.
2. When the SEN signal changes from low level to high level, the rotational data and initial incremental pulses are
output.
Until these operations have been completed, the motor cannot be operated regardless of the status of the servo
ON. The panel operator display will also remain "bb."
Host controller
+5V
7406 or equivalent
We recommend a PNP transistor.
Signal levels

5.9.3 Absolute Encoder Data Backup

In order for the absolute encoder to retain position data when the power is turned OFF, the data must be
backed up by a battery.
Install the battery in the host controller or the SERVOPACK.
• Do not install the battery at both the host controller and the SERVOPACK.
It is dangerous because a loop circuit between the batteries is set up.
Installing the Battery at the Host Controller
Connect the battery to the host controller, referring the following diagram. Use an ER6VC3 battery (3.6 V, 200
mAh: manufactured by Toshiba Battery Co., Ltd.) or an equivalent.
Host controller
7406
Applicable line receiver:
Taxas Instruments's SN75ALS175 or MC3486
Terminating resistance R: 220 to 470Ω
SERVOPACK
CN1
100 Ω
SEN 4
High level:
About 1 mA
4.7 k Ω
2
SG
0V
High: 4.0 V min., Low: 0.8 V max.
+5V
SEN
SG
0V
BAT(+)
+
Battery
-
BAT(-)
Line receiver
PAO
R
/PAO
Phase A
PBO
R /PBO
Phase B
PCO
R /PCO
Phase C
SG
0V
0.1 μ
0V
PROHIBITED
SERVOPACK
CN2
CN1
∗
PG5V
4
1
PG0V
2
2
21
BA T (+)
3
22 BAT ( - )
4
PS
33
5
34
/PS
6
35
Connector
36
shell
19
Sheild (shell)
20
1
∗
: Represents twisted-pair wires.
Note: Set the SEN signal to low level
when the main circuit power to the
SERVOPACK is turned OFF.
5.9 Absolute Encoders
Encoder
∗
ENC
5
5-67