Chapter 11
Troubleshooting
11-6
Troubleshooting Tables
Table 11.B provides a listing and description of the faults shown through
the front panel display. Also included are possible solutions to the faults.
Table 11.C provides a listing of common system malfunctions and their
possible causes. Table 11.D lists servomotor malfunctions and their
possible causes. Table 11.E provides a listing and description of the
available test points. Refer to Figure 11.1 for board, connector and test
point locations.
Fault Codes
Parameter 06 is a 16 bit, binary word that represents the drive faults. A “1”
indicates that a fault has occurred. If a “0” is displayed, a fault has not
occurred. Refer to the following table for an explanation of the individual
codes.
Bit 15
Bit 0
Table 11.B
Fault Descriptions and Diagnostics
1. The input line voltage is out of tolerance.
2. The transformer auxiliary logic supply winding is open.
3. The logic supply (
±
12V DC, +5V DC) circuits have malfunctioned (fuse
blown etc.) or the AC input at TB4-19, 20, 21 is incorrectly wired.
A fault will occur if the logic supply
rises or drops 10% from its nominal
value.
Control Voltage Fault
“cntrl voltage”
(Bit 4)
Potential Cause
All circuits are functional.
Fault Description
None
Fault/Message
“No Active Faults”
Drive
Overtemperature
“amp overtemp”
(Bit 1)
The drive contains a thermal switch on
the heat sink which senses the power
transistor temperature. If the
temperature is exceeded the LED will
illuminate.
The logic supply (
±
12V DC, +5V DC) circuits have malfunctioned (fuse blown
etc.) or the AC input at TB4-19, 20, 21 is incorrectly wired.
The heat sink thermal overload has tripped. One or more of the following may
have occurred:
1. The cabinet ambient temperature is above rating.
2. The machine duty cycle requires an RMS current exceeding the continuous
rating of the drive.
3. The integral fan is not functioning.
4. The airflow access to the drive is limited or blocked.
Power Fault
“power fault”
(Bit 7)
1. The current through any one of the power transistors has exceeded 300%
of the drive’s current rating.
2. Malfunctioning power transistor.
3. Shorted Lead.
4. Motor malfunction.
The current through the power
output transistors is monitored. If the
current exceeds a fixed level
(greater than 300% of drive rating)
the LED will illuminate.
1. Open or short circuit on resolver wiring.
2. Incorrect resolver wiring.
The resolver wiring is open or
shorted or missing.
Resolver Loss
“resolver loss”
(Bit 5)
Summary of Contents for ALLEN-BRADLEY 1391-DES
Page 1: ...User Manual 1391 DES Digital AC Servo Drive...
Page 9: ...Chapter 1 Introduction 1 10 End of Chapter...
Page 37: ...Chapter 5 Inputs Outputs and Switch Settings 5 8 End of Chapter...
Page 84: ...Chapter 8 Start Up 8 16 End of Chapter...
Page 88: ...Chapter 9 1326 AC Servomotors 9 4 End of Chapter...
Page 106: ...Chapter 11 Troubleshooting 11 12 End of Chapter...
Page 122: ...Appendix B Interconnect Drawings B 12 End of Appendix...
Page 126: ...Appendix C Cable Information C 4 End of Appendix...
Page 134: ...Appendix E Parameter Record E 8 End of Appendix...
Page 135: ...Notes...
Page 136: ...Notes...
Page 137: ...Notes...
Page 138: ...Notes...
Page 139: ...Notes...
Page 140: ...Notes...
Page 141: ...Notes...
Page 142: ...Notes...
Page 143: ...Notes...
Page 144: ...Notes...
Page 147: ...IMC is a trademark of Allen Bradley Company Inc...
