72
Parameter Setup
Parameters for Full-Closed Control
7B
*
(F)
1 to 10000
<100>
16 x
external
scale
pulse
Hybrid deviation
error level
• You can setup the permissible gap (hybrid deviation) between the
present motor position and the present external scale position.
7C
*
(F)
0 to 1
<0>
–
External scale
direction
You can set up the logic of the absolute data of the external scale.
<Caution>
Unlike 16.Pr50 (setup of operating direction), this parameter depends on
the mounting direction of external scale. Please note that the full-closed
control cannot be executed appropriately in a reverse setting.
78
*
(F)
79
*
(F)
7A
*
(F)
0 to 32767
<10000>
0 to 17
<0>
1 to 32767
<10000>
–
–
–
Numerator of
external scale
ratio
Multiplier of
numerator of
external scale
ratio
Denominator of
external scale
ratio
You can setup the ratio between the encoder resolution and the external
scale resolution at full-closed control.
• SV.Pr78= 0
Numerator equals to encoder resolution, and you can setup
the external scale resolution per one motor revolution with SV.Pr7A.
• SV.Pr78
≠
0,
Setup the ratio between the external scale resolution and the encoder
resolution per one motor revolution according to the above formula.
<Caution>
• Upper limit of numerator value after calculation is 131072. Setup
exceeding this value will be invalidated, and 131702 will be the actual
numerator.
• The actual calculation of numerator is “numerator of external scale
division (SV.Pr78) x 2 to the nth power (a set value of SV.Pr79)”.
Encoder resolution per one motor revolution
External scale resolution per one motor revolution
SV.Pr78 X 2
SV.Pr79
SV.Pr7A
=
Setup value
0
1
Content
Serial data will increase when the detection head travels
to the right viewed from the mounting side. (+ count)
Serial data will decrease when the detection head travels
to the right viewed from the mounting side. (– count)
Standard default : < >
Servo
PrNo.
Setup
range
Unit
Title
Function/Content
Standard default : < >
Servo
PrNo.
Setup
range
Unit
Title
Function/Content
73
0 to 20000
<0>
r/min
Setup of
over-speed level
• You can set up the over-speed level. The over-speed level becomes 1.2
times of the motor max. speed by setting up this to 0.
• Use this with 0 setup in normal operation. Set up other value only when
you need to lower the over-speed level.
• The setup value of this parameter is limited by 1.2 times of the motor
max. speed.
<Caution>
The detection error against the setup value is
±
3 [r/min] in case of the 7-wire
absolute encoder, and
±
36 [r/min] in case of the 5-wire incremental encoder.
<Notes>
• Anything marked with “(F)” on the servo parameter number (Servo PrNo.) can be used only for the “Full-
Closed Control”.
• For servo parameters which No. have a suffix of "*", changed contents will be validated when you turn on
the control power.
