Yaskawa PG-E3 Motor Encoder Feedback - Manual (Page 25)

24 YASKAWA ELECTRIC TOBP C730600 52C 1000-Series Option PG-E3 Installation Manual
7 Troubleshooting
7 Troubleshooting
◆
Preventing Noise Interference
Take the following steps to prevent erroneous operation caused by noise interference:
• Use shielded wire for the PG encoder signal lines.
• Limit the length of all motor output power cables to less than 10 m.
• Separate the control wiring to the option, main circuit input power wiring, and motor
output power cables.
• Ground the shield on the PG encoder side and the drive side. If noise problems arise in the
PG encoder signal, verify that the shield is properly grounded and ground one end of the
signal line or remove the ground connection on both ends.
• Properly connect the shield in cable to the IG on the option terminal or remove the ground
connection on both ends.
■ Interface Circuit
Figure 11
Figure 10 Interface Circuit
PG-E3
2.5 V
2.5 V
120
Ω
1 k
Ω
A–,B–,R–
A+,B+,R+
C–,D–
C+,D+
a+
a–
b+
b–
PG Encoder
Monitor Signal
26LS31 Level