Vacon · NXS NXP
The 'Run Enable' signal, which is required for the drive to operate, is currently low or inactive. This is a safety interlock designed to prevent the drive from starting. The drive will remain disabled until the run enable condition is met and the corresponding signal is active.
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Measure voltage at the designated 'Run Enable' digital input terminal (e.g., terminal 18) with respect to common (terminal 20) (should be 24VDC when enabled).
Trace the 'Run Enable' signal back through any external safety relays, verifying their contact closure and integrity.
Check PLC/controller logic for the run enable bit and ensure it is being set correctly (e.g., through Modbus register 40001).
Verify the status of any integrated safety functions (e.g., STO) via drive diagnostics and ensure they are reset.
Confirm drive parameter P5-10 (Digital input function) is correctly assigned for 'Run Enable' (e.g., '8 = Start').
Inspect the digital input terminal for loose wiring or corrosion.