Encoder Pulse Input Circuit - YASKAWA VS-626M5 Instruction Manual

Vector-controlled inverter drives with power regenerative function for machine tools
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4.6 Encoder Pulse Input Circuit

Phase A, B, and C (origin) signals [PA, *PA, PB, *PB, PC, *PC] are input into the 2CN connector from the 1024
P/R motor encoder.
An asterisk indicates a reversed signal. The input signals have the following specifications.
Signal Configuration
J
90° phase-difference, two-phase pulse (A and B), and marker pulse (C)
Input Circuit Configuration
J
The input circuit is a line receiver with RS-422-A specifications.
Phase A
Phase B
Phase C
Fig 4.3
Input Phase
J
Fig 4.4
2CN
Inverter
+5 V
4, 5, 6
(300 mA max)
1, 2, 3
16
0 V
C R
17
18
C R
19
14
C R
15
Line receiver
7
equivalent to
SN75175
SS
P
indicates shielded
twisted-pair wires.
Encoder Pulse Input Circuit
Phase A
(PA)
90°
Phase B
(PB)
Phase C
(PC)
(a) Forward
Input Phase
4 -19
Encoder
PA
P
*PA
PB
P
*PB
PC
P
*PC
Output line driver
equivalent to
SN75174
Phase A
(PA)
90°
Phase B
(PB)
Phase C
(PC)
(b) Reverse
4.6 Encoder Pulse Input Circuit
+5 V
Phase A
Phase B
Phase C
4

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