ACS 400 User’s Manual89Group 31: Automatic ResetThe automatic reset system can be used for resetting overcurrent, overvoltage, undervoltage andanalogue input loss faults automatically. Number of allowed automatic reset operations within acertain time is selectable.Warning! If parameter 3107 AR AI is enabled, the drive may restart even after a long stop whenthe analogue input signal is restored. Ensure that the use of this feature will not cause physical injuryand/or damage equipment.Figure 50 Operation of automatic reset function. In this example, if the fault occurs at the moment“Now”, it is automatically reset if parameter 3101 NR OF TRIALS value is greater than or equal to 4.Code Description3101 NR OF TRIALSSets the number of allowed autoresets within a certain time. The time is defined with parameter 3102 TRIALTIME . The ACS 400 prevents additional autoresets and remains stopped until a successful reset isperformed from the control panel or from a place selected by parameter 1604 FAULT RESET SEL .3102 TRIAL TIMEThe time within which a limited number of fault autoresets is allowed. The allowed number of faults per thistime period is given with parameter 3101 NR OF TRIALS .3103 DELAY TIMEThis parameter sets the time that the ACS 400 will wait after a fault occurs before attempting to reset. If setto zero, the ACS 400 will reset immediately.3104 AR OVERCURRENT0 = DISABLE1 = ENABLEIf 1 is selected, the fault (motor overcurrent) is reset automatically after the delay set by parameter 3103,and the ACS 400 resumes normal operation.3105 AR OVERVOLTAGE0 = DISABLE1 = ENABLEIf 1 is selected, the fault (DC bus overvoltage) is reset automatically after the delay set by parameter 3103,and the ACS 400 resumes normal operation.3106 AR UNDERVOLTAGE0 = DISABLE1 = ENABLEIf 1 is selected, the fault (DC bus undervoltage) is reset automatically after the delay set by parameter 3103DELAY TIME , and the ACS 400 resumes normal operation.3107 AR AI0 = DISABLE1 = ENABLEIf 1 is selected, the fault (analogue input signal under minimum level) is reset automatically after the delayset by parameter 3103 DELAY TIME .X X X TimeTrial timex = Automatic reset Now
