YASKAWA ELECTRIC TOBP C730600 37B 1000-Series Option PG-X3 Installation Manual 25
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 signal lines.
• Limit the length of all motor output power cables to less than 100 m.
• Separate the control wiring to the option, main circuit input power wiring, and motor
output power cables.
• Ground the shield on the PG side and the drive side. If noise problems arise in the PG
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 11
Figure 11 Interface Circuit
26LS32 level
26LS31level
PGX3
PG
A,B,Z
A+,B+,Z+
600 Ω
a,b,z
a+,b+,z+
SG
Monitor Signal
A,B,Z
A,B,Z
26LS31 level
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