Input switch open

What does 64 mean?

The main input power switch for the drive is detected as open, preventing power from reaching the drive and making it inoperable. This could refer to a physical disconnect switch, a tripped circuit breaker, or an internal contactor. The drive cannot function without incoming power.

• Main circuit breaker (e.g., Q1) upstream of the drive is tripped or intentionally switched off.
• Main disconnect switch (e.g., DS1) feeding the drive is open.
• Fuse failure in the input power line to the drive (e.g., L1, L2, L3).
• Internal power contactor (if present) failed to close or its auxiliary contacts are faulty.
• Drive's internal input voltage monitoring circuit (e.g., over/under voltage detection) is faulty or miscalibrated.

Click steps to track your progress.

1. 1

   Verify the main circuit breaker (e.g., Q1) feeding the drive is in the 'ON' position and not tripped.

2. 2

   Confirm the main disconnect switch (e.g., DS1) to the drive is closed and locked out (LOTO).

3. 3

   Measure line voltage at the drive input terminals (e.g., R, S, T) (should be 400VAC or 480VAC) using a true-RMS multimeter.

4. 4

   Check continuity of input fuses (if present) using a multimeter.

5. 5

   Inspect any upstream power contactors or auxiliary contacts for proper operation and connection.

6. 6

   Review the drive's event log for any related under-voltage or phase loss fault codes.