Interface Circuits - YASKAWA SGDH User Manual

8 Operation

8.4.1 Interface Circuits

8.4.1 Interface Circuits
The following diagram shows the standard connections for a an absolute encoder mounted to a servomotor. The
connection cables and wiring pin numbers depend on the servomotor. For details, refer to chapter 5 Specifica-
tions and Dimensional Drawings of Cables and Peripheral Devices.
Host controller
Serial interface
circuit
UP
Up/down
counter
DOWN
Clear
Applicable line driver:
Texas Instruments's SN75175 or KM3486
Terminating resistance R: 220 to 470 Ω
• SEN Signal Connection
Type Name
Input SEN
This input signal is required to output absolute data
from the SERVOPACK.
Let at least three seconds elapse after turning ON the
power before changing the SEN signal to high level.
When the SEN signal changes from low level to high
level, the multiturn data and initial incremental pulses
are output.
Until these operations have been completed, the servo-
motor cannot be turned ON regardless of the status of
the servo ON signal (/S-ON). The panel operator dis-
play will also remain "b.b."
Refer to 8.4.6 Absolute Encoder Reception Sequence.
IMPORTANT
Maintain the high level for at least 1.3 seconds when the SEN
signal is turned OFF and then ON, as shown in the figure on the
right.
+5V
SEN
7406
SG
0V
BAT(+)
+
Battery
- BAT(-)
Line driver PAO
R
/PAO
PA
PBO
Edge
R
/PBO
detection
PB
PCO
R
/PCO
PC
PSO
Serial interface
R
/PSO
circuit
PS
SG
0V
Connector
Pin Number
CN1-4
SERVOPACK
∗1
CN2
CN1
4
1
2
2
21
3
22
4
33
5
34
6
35
36 Connector
shell
19
20
48
49
1
∗1
∗2 For wiring pin numbers, refer to chapter 5
Specifications and Dimensional Drawings of
Cables and Peripheral Devices
Setting
OFF (low level) Input when power is turned ON
ON (high level) Input at absolute data request
Host controller
+5V
7406 or equivalent
0V
We recommend a PNP transistor.
Signal levels
High: 4.0 V min. Low: 0.8 V max.
SEN signal
OFF
8-28
Encoder
∗1
PG5V
∗2
PG0V
BA T (+)
BAT ( - )
PS
/PS
Shield (shell)
Represents twisted-pair wires.
Meaning
SERVOPACK
CN1
100 Ω
SEN 4
High level:
About 1 mA
4.7 k
2
SG
ON (high level) OFF
1.3 s min.
PG
1 µ
Ω
0V
ON
15 ms min.