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 the PG encoder signal cables to less than 100 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 of the cable 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.
Interface Circuit
■
Figure 12
34
PG X3
26LS32 level
26LS31 level
Figure 13 Interface Circuit
YASKAWA ELECTRIC TOBP C730600 37C 1000-Series Option PG-X3 Installation Manual
A,B,Z
A+,B+,Z+
600 Ω
A ,B ,Z
A,B,Z 26LS31 level
a+,b+,z+
a ,b ,z
Monitor Signals
SG
PG Encoder
X3