POWER SUPPLY FAULT

What does 902 mean?

The Low Voltage Power Supply (A4) output has dropped below 60% of its rated voltage, leading to a drive shutdown. A CPU Reset is required after the cause of the fault has been rectified.

• Loss of 115V AC input power to the A4 power supply.
• Short circuits present in the +5V, +/-15V, or +24V circuits, potentially external to the drive itself.
• Failure of the A4 Power Supply module.
• A blown fuse located internally within the A4 power supply.

Click steps to track your progress.

1. 1

   Verify the presence of 115V AC input power to the A4 board.

2. 2

   Check for short circuits in the +5V, +/-15V, and +24V circuits, inspecting both internal and external connections.

3. 3

   Inspect any internal fuses of the A4 power supply for continuity and replace if blown.

4. 4

   If all other causes are ruled out, replace the A4 Power Supply PCB.

5. 5

   Perform a CPU reset on the Drive Control PCB after addressing the fault.