Input switch open

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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.

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

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.