Panasonic MCDDT3520 - Page 72

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
UnitTitle Function/Content
Standard default : < >
Servo
PrNo.
Setup
range
UnitTitle Function/Content
73 0 to 20000
<0>
r/minSetup 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.