Nidec Control Techniques Digitax-SF DA21223, Инструкция по эксплуатации

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78
5. Settings
Digitax SF I
nstruction Man
ual
５. Parameters
No. 276.0
Encoder pulse output:
Pulse ratio (numerator)
Range Default Characteristics
1 to 65,535
1,000
[pulse/rev]
No. 278.0
Encoder pulse output:
Pulse ratio (denominator)
1 to 65,535
8,000
[pulse/rev]
Function
Use
Set the encoder pulse output ratio with these two parameters.
Where the pulse count per rotation of host command and the pulse count per rotation of the motor
do not agree,
（numerator） =（single-turn pulse count of host command）/4
（denominator）=（single-turn pulse count of the motor） /4=32,768
=
host command pulse count per rotation / 4
motor pulse count per rotation / 4
=
278.0
276.0
=
host command pulse count per rotation
motor pulse count per rotation
Example Settings Units: [pulse/rev]
A
Host Command
Pulse count per rotation
B
Numerator
No. 276.0
C （①×1/4）
Denominator
No. 278.0
16,384 4,096
32,768
(=131,072
(*)
/ 4 )
10,000 2,500
4,096 1,024
4,000 1,000
*) 131,072 is the pulse count per rotation of the motor.
The setting range of the ratio derived from these two parameters is 1/32,768 to 1.
The default setting values are assumed 16,384 pulses of the host command pulse number per a
rotation.
If the Z-phase pulse width is too narrow to be measured accurately by the host controller, decrease
this encoder pulse ratio or decrease the number of rotations to increase the pulse width.
PLC normally requires approximately 1 ms pulse width.
=
60 × 1,000
number of rotations [
rpm
]
pulse width[ms]
=
２ × ×
=
1
the paired-pulse ratio × 2
17
Remark
・Use these parameters within the max output frequency of 4 Mpps.
・Note that [Encoder output resolution] × [(Numerator)/(Denominator)] has to be a multiple of 4.
Related To No. 34.0, No. 36.0, No. 272.1, No. 276.0, No. 278.0