8 Operation
8.6.3 Position Reference
8-56
When the external power supply is used, the circuit will be isolated by a photocoupler. When the SERVO-
PACK internal power supply is used, the circuit will not be isolated.
*
: Represents twisted-pair wires.
When the open-collector output is used, input signal noise margin lowers. Set the parameter Pn200.3 to 1.
(3) Position Control Block Diagram
A block diagram for position control is shown below.
CN1
7
3
8
1
14
15
12
11
13
18
/PULS
SIGN
/SIGN
CLR
/CLR
PULS
PL1
PL2
PL3
150
Ω
1k
Ω
+12V
∗
Tr1
1.5 V max. at ON
SERVOPACK
Host controller
Photocoupler
IMPORTANT
Kp
M
Pn201
Pn204
Pn202
Pn203
+
-
Pn102
Pn203
Pn202 Pn10A
Pn107
Pn109
PG
Pn200.0
Pn108
B
A
B
A
+
+ +
Differ-
ential
Smoothing
Error
counter
Feed-
forward
Feed-for-
ward fil-
ter time
constant
Bias
Speed
loop
Current
loop
Dividing
Servomotor
Reference
pulse
PG signal
output
SERVOPACK (in position control)
Encoder
Bias adding
width
×
4
×
4
×
2
×
1
Summary of Contents for SGDH
Page 435: ...8 3 8...