Emergency stop

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An emergency stop command has been received by the drive from either a digital input or via the fieldbus, resulting in an immediate halt of operation. This is a critical safety function that stops the machinery in an emergency. The drive will not accept a new run command until the fault is reset and the emergency stop condition is completely cleared.

• Emergency Stop pushbutton activated, opening the safety circuit and removing the 'Run Enable' signal.
• External safety device (e.g., light curtain, safety gate switch) tripped, activating the E-stop circuit.
• Fieldbus E-stop command (e.g., specific bit in control word) sent by PLC/controller due to an external system fault.
• Wiring fault in the E-stop circuit causing an unintended open circuit condition at a safety input.
• Drive internal safety monitoring system (e.g., STO) detected an issue and triggered an E-stop.

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1. 1

   Inspect all Emergency Stop pushbuttons and external safety devices (e.g., safety mats, light curtains) for activation.

2. 2

   Measure continuity across the E-stop circuit (e.g., via safety relay contacts) to identify the open point.

3. 3

   Monitor fieldbus control word from the PLC/controller to confirm E-stop command (e.g., bit 10 in control word 1) is not active.

4. 4

   Verify voltage at the drive's safety input terminals (e.g., terminals 37 and 38 for STO) for required 24VDC.

5. 5

   Reset any tripped safety relays or re-engage safety devices and confirm their status indicator lights (e.g., green LED).

6. 6

   Check drive's event log for specific E-stop source (e.g., 'DI 18 - E-stop activated').