Safety Circuit Fault (Input Open)

Was bedeutet Safety circuit fault ?

This fault occurs when the safety circuit input terminals (across S1 and PC, or across S2 and PC) are detected as open. This indicates a break in the safety loop, signaling a potentially unsafe condition and leading to inverter shutdown. It could be due to incorrect wiring, a fault in an external safety device, or an activated safety interlock.

• Emergency Stop button released or pressed incorrectly, causing its NC contact to open the safety loop.
• External safety relay contacts (connected in series to S1/PC or S2/PC) failed to close or opened unexpectedly.
• Guard interlock switch opened due to a door or access panel being unsecured, breaking the safety circuit.
• Broken wire, loose terminal connection, or damaged cable in the external safety circuit loop.
• Faulty external safety device (e.g., light curtain, safety scanner) signaling a trip condition.

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1. 1

   Verify all emergency stop buttons are released and their associated NC contacts are closed (measure continuity across contacts).

2. 2

   Confirm all safety guard doors and access panels are securely closed, actuating their interlock switches.

3. 3

   Inspect the external safety relay (if present) for proper coil energization and contact closure (measure voltage across coil).

4. 4

   Measure continuity across inverter terminals S1 and PC, and S2 and PC to identify the specific open circuit segment.

5. 5

   Check the status indicators on any connected external safety devices for active alarms or tripped states.

6. 6

   Verify that the safety circuit wiring uses appropriate wire gauge and shielding (e.g., 18AWG twisted pair).