OC.F is an impedant short-circuit fault.
O.CF is a fault Motor short-circuit (Phase/earth).
Microcontroller interruption time is 250 μs, sometimes the current can goes faster than this time and drive firmware isn't able to manage it.
With ATV12, ATV32, ATV71 there is a hardware CLI level, limitation current pick before to reach the short circuit level. In general, during CLI the IGBT order is stopped, and we have OCF if drive stays in CLI during 100ms, so during CLI the motor control doesn't control the motor command.
On ATV312 there is no hardware CLI, it is only firmware CLI it's better because the motor control can control the torque but due to the low time reaction of the firmware, there is more O.CF than other drives.
O.CF is a fault Motor short-circuit (Phase/earth).
Microcontroller interruption time is 250 μs, sometimes the current can goes faster than this time and drive firmware isn't able to manage it.
With ATV12, ATV32, ATV71 there is a hardware CLI level, limitation current pick before to reach the short circuit level. In general, during CLI the IGBT order is stopped, and we have OCF if drive stays in CLI during 100ms, so during CLI the motor control doesn't control the motor command.
On ATV312 there is no hardware CLI, it is only firmware CLI it's better because the motor control can control the torque but due to the low time reaction of the firmware, there is more O.CF than other drives.
Released for: Schneider Electric India
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