Yaskawa DR2 Sigma Servo - Manual (Page 501)

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