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7 Troubleshooting u Preventing Electrical Interference
Take the following steps to prevent erroneous operation caused by noise interference:
1. Use shielded wire for the PG encoder signal lines.
2. Use PG encoder signal cables that are shorter than 20 m (65 ft).
3. When using EnDat, the signal “Sensor Up” must be connected to terminal IP on the PG-F3 option for cables longer than 10 m. Additionally, the “Sensor 0 V” must be connected to terminal IG.
4. Separate option control wiring from main circuit input power wiring and motor output power cables using conduit or cable tray dividers.
5. Ground the shield of the cable on the PG encoder side and the drive side.
6. Verify that the shield is properly grounded and ground one end of the signal line or remove the ground connection on both ends if electrical interference problems arise in the PG encoder signal.
n
Interface Circuit
EnDat 2.1/01, EnDat 2.2/01
Figure 19
PG-F3 Encoder
120
Ω
A – , B –
A+, B+
2.5 V
Clock
Data output
120
Ω
CK
CK
DT
DT
Data input
26LS31 Level a+ a
– b+ b –
Monitor Signals
Figure 22 Interface Circuit (EnDat 2.1/01, EnDat 2.2/01)
YASKAWA ELECTRIC TOBP C730600 77B YASKAWA AC Drive Option PG-F3 Installation Manual 51
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7 Troubleshooting
EnDat 2.2/22
Figure 20
PG-F3
Clock
Data output
2.5V
Data input
A – ,B –
120 Ω A+,B+
CK
CK
120
Ω
DT
DT
Encoder
26LS31 Level a+ ab+ b-
Figure 23 Interface Circuit (EnDat 2.2/22)
F3
52 YASKAWA ELECTRIC TOBP C730600 77B YASKAWA AC Drive Option PG-F3 Installation Manual
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7 Troubleshooting
HIPERFACE
Figure 21
PG-F3
Encoder
Clock
Data output
2.5 V
Data input
120 Ω
A-,B-
A+,B+
120
Ω
CK
CK
DT
DT
26LS31 Level a+ ab+ b-
Monitor Signals
Figure 24 Interface Circuit (HIPERFACE)
F3
YASKAWA ELECTRIC TOBP C730600 77B YASKAWA AC Drive Option PG-F3 Installation Manual 53
