YASKAWA SGM-A3 User Manual page 501

• When detector EXE650B (interpolation magnification: 25) is used:
8MHz Clock
Max. Input Min. Edge
Frequency Interval
fE max a min
Approx. 0.125µs
60kHz
40kHz 0.25µs
20kHz 0.5µs
10kHz 1.0µs
2) Application Review
a) Linear Scale :
b) Min. Edge Interval and Pulse Width
• With the above a) and b), switching S
c) Feedback Frequency to Detector Output Frequency and Error Counter
d) DR2 User Constant (Cn-24, -25)
Min. Pulse Max. Input
Width Frequency
b min fE max
0.125µs Approx.
60kHz
0.25µs 50kHz
0.5µs 25kHz
1.0µs 12.5kHz
Operation Speed
Input Frequency =
Scale Interval
= 2000PPS < EXE650B Max.InputFrequency
DR2 receivable max. frequency : 675kHz
10
6
= 0.3704 μs < Min. Edge Interval
675000 × 4
both of the following conditions:
Max. Input
Frequency
20kHz
10kHz
Detector Output Frequency = 2000 ×25 = 50000PPS ! 50kPPS
Feedback Frequency = 50 ×4 = 200kPPS
* Electronic Gear = B
A
10MHz Clock
Min. Edge Min. Pulse
Interval Width
a min b min
0.1µs 0.1µs
0.2µs 0.2µs
0.4µs 0.4µs
0.8µs 0.8s
1200∕60
=
0.01
and S at 8MHz clock can be performed under
3 4
S S
3 4
−
×
− −
= Cn–24 = Cn–2A × 4 = 6000 × 4
4×6
Cn–25
0.0001×10
Switching
S3 S4
× ×
−
×
−
×
− −
(×: Switch is closed)
= 1
24000 1
493
G