Cause : Instantaneous overcurrent - This can be caused by several factors, including issues with the motor, wiring, load, or even drive settings.

DESAT (OVER I) fault in parker AC690 drive indicate that the current flowing through the drive exceeds its rated capacity.

Possible Causes and Solutions:

1. Short Circuit or Ground Fault:

   • Cause: A short circuit in the motor windings, power cables, or connections can lead to a sudden surge in current.
   • Solution:
     • Inspect the motor and wiring: Check for any signs of insulation damage, loose connections, or exposed wires that could cause a short circuit. Repair or replace any damaged components.
     • Use an insulation tester: Test the motor windings and power cables to ensure there are no shorts to ground.

2. Excessive Load or Mechanical Binding:

   • Cause: The motor may be driving a load that is too heavy or encountering mechanical resistance, leading to increased current draw.
   • Solution:
     • Check the load: Ensure that the load is within the motor and drive’s rated capacity. If the load has increased recently, consider reducing it or resizing the motor and drive accordingly.
     • Inspect for mechanical issues: Check for any obstructions, misalignments, or other mechanical problems that might be causing the motor to work harder than normal.

3. Incorrect Motor Parameters:

   • Cause: Incorrectly configured motor parameters (e.g., motor rated current, voltage, etc.) in the drive can lead to improper operation and overcurrent faults.
   • Solution:
     • Verify motor settings: Double-check the motor parameters in the drive’s configuration to ensure they match the motor's nameplate data. Adjust any incorrect settings.

4. Acceleration/Deceleration Rates:

   • Cause: Rapid acceleration or deceleration can cause the drive to draw more current than it can handle.
   • Solution:
     • Adjust ramp times: Increase the acceleration and deceleration times in the drive’s settings to reduce the current draw during these phases.

5. Internal Drive Issues:

   • Cause: There could be a problem with the drive's internal components, such as IGBTs (Insulated Gate Bipolar Transistors) or other power electronics.
   • Solution:
     • Inspect the drive: If all external factors have been ruled out, the drive itself may have an internal fault. Contact Parker technical support for further diagnostics or consider sending the drive in for repair.