YASKAWA 1000 Series Installation Manual page 34

7 Troubleshooting
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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.
• Use separate conduit or cable tray dividers to separate option control wiring, main circuit
input power wiring, and motor output power cables.
• Ground the shield on the PG encoder side and the drive side. If electrical inteference
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
26LS31 Level
34
PG-E3
120 Ω
2.5 V
1 kΩ
2.5 V
Figure 12 Interface Circuit
YASKAWA ELECTRIC TOBP C730600 52D 1000-Series Option PG-E3 Installation Manual
A–,B–,R–
A+,B+,R+
C–,D–
C+,D+
a+
a–
b+
b–
PG Encoder
Monitor Signals