120Under voltageThe DC bus voltage drops belowthe permissible value, theinput is single phasing, orthere is a phase imbalance ofgreater than 2%.The DC bus voltage rises abovethe permissible value eitherduring motor regenerativeoperation or as a result of lineside voltage spikes.Occurs when the specified peakoutput current is exceeded orif there is a ground fault.Time dependent overload. Seeoverload curves on page 21.Error can not be rest until dis-play shows E.nOL!Time dependent overload at lowspeed. See overload curve onpage 28.Error can not be rest until dis-play shows E.nOL!The drive has cooled down afteran E.OL or E.OL2 error.• Input voltage is too low or unstable• Input wiring is wrong• Isolation transformer is too small• Isolation transformer is not connected correctly• One phase of the input line is missing• Phase imbalance greater than 2%• Input voltage is too high – install a step downtransformer• Voltages spikes on the line – install 5% linechoke• Braking resistor is not connected or has abroken connection or the resistance is too high– verify braking resistor resistance• Inverter is poorly grounded• Short circuit on the motor leads• Ground fault on the motor leads – verify motorwiring• Contacts on motor contactor are damaged orburned causing arcing - check and replace• Inverter poorly grounded• Incorrect motor data – verify data LF10-LF1• Shorted output transistor• Motor wired for incorrectly• Motor data is wrong, specifically motor current• The inverter is sized too small• High mechanical load (friction) on gear,guides, or rails… etc• Stand still current of the motor is too high – re-duce the switching frequency of the inverter to8kHz (LF.38 = 0) see also US.16.• Motor data is not adjusted properly• Inverter sized too small• High mechanical load (friction) on gear,guides, rails…etc• Motor wired incorrectly• The errors E.OL and E.OL2 can only be resetafter E.noL is displayedDisplay Description Cause and SolutionOverloadOver currentOver voltageCool downphasecompletedLow speedoverloadError Messages6.3 Error Messages and Their Cause
