Altivar 312 Variable Speed Drives Page 18 Introduction

18 Altivar 312 variable speed drives Functions Functions (continued) Detected fault management There are various operating modes in the event of resettable detected faults: Freewheel stop The drive switches to the fallback speed The drive maintains the speed at which it was operating when the detected fault occurred, until the detected fault disappears Stop on ramp Fast stop The following resettable faults are detected: Drive overheating Motor overheating CANopen bus detected fault Modbus serial link failure External detected faults Loss of 4-20 mA signal Detected fault reset This function is used to clear the last detected fault by means of a logic input. The restart conditions after a reset are the same as those for a normal power-up. Resets the following detected faults: overvoltage, overspeed, external detected fault, drive overheating, output phase loss, DC bus overvoltage, loss of 4-20 mA reference, load slipping, motor overload if the thermal state is less than 100%, serial link detected fault. Line supply undervoltage and input phase loss detected faults are reset automatically when the line supply is restored. This function is suitable for applications where the drives are difficult to access, for example on moving parts or in material handling systems. General reset (disables all detected faults) This function disables all detected faults, including thermal protection (forced operation), and can result in irreparable damage to the drive. This invalidates the warranty. This function is suitable for applications where restarting may be crucial (conveyor in an oven, smoke extraction system, machines with solidifying products that need to be removed). The function is enabled by a logic input. Detected fault monitoring is active if the logic input is at state 1. All detected faults are reset on a change of state r of the logic input. Controlled stop on loss of line supply This function is used to control motor stopping on a loss of line supply. It is suitable for material handling, machines with high inertia, continuous product processing machines. Possible types of stop: Locking of the drive and freewheel stop Stop which uses the mechanical inertia to maintain the drive power supply as long as possible Stop on ramp Fast stop (depends on the inertia and the braking ability of the drive) Stop mode in the event of a detected fault The type of stop that occurs on detection of a fault is configurable as normal, freewheel or fast for the following detected faults: External detected fault (detection enabled by a logic input or a bit in a Modbus or CANopen control word) Motor phase loss detected fault If an output contactor is being used between the drive and the motor, the motor phase loss detected fault should be disabled.

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