Drivecon IOC fault code meaning

Series: VF51RG regenerative unit

Overcurrent trip IOC

AC drive

Meaning: If overcurrent, for example, short-circuit current that rises suddenly and that cannot be protected by FCL, all transistors of converter are switched off. Converter stops with "IOC" illuminated on either LEDs provided on main control board of VF51RG or IOC LEC on driver PC board. IOC level is +20% over FCL level. | Should IOC trip occur immediately after Run signal is applied to the regenerative converter, problem may lie in phasing of input connections. Terminals RA, SA, and TA MUST be in phase with R, S and T. If not, the regeneration converters transistors will conduct out of phase with lin

Possible causes

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