Rockwell Automation 1391 USER MNL/DIGITAL AC SERVO DR - Manual (Page 98)

Chapter 11
Troubleshooting
11-4
A Quad B Board Substitution
1. Remove all power to the drive branch circuit.
2. Remove the front cover from the drive. Label and remove the ribbon
cables and signal connectors (TB1, TB2 and TB3) from the A Quad B
and Logic Control Boards.
3. Remove the Display and Logic Control Boards.
4. Remove the A Quad B Board.
5. Install the new A Quad B Board to the Logic Control Board with the 8
thumb screws.
6. Install the Logic Control Board (w/AQB Board) verifying that the
connectors between the boards mate. Tighten the 8 screws.
7. Install the Display Board and cable.
8. Reconnect the signal connectors/cables previously removed.
9. Apply power to the system and check for proper operation – tuning
should not be required.
LED Indications
The 1391-DES has two LEDs visible from the front of the drive. The top
LED, labeled “STATUS,” flashes green when no faults are detected by the
drive and a bus undervoltage condition exists. The LED will be a steady
green when no faults exist and bus voltage is present. If a fault is detected,
the LED will turn red and flash.
The lower green LED, labeled “ENABLE,” will be lit when the drive is
enabled (on and in control of the servomotor). An enable signal must be
applied to terminals TB2-9 & 10 for the LED to be lit. Refer to Table 11.A
for further information.