178Diagnostics and Troubleshooting*Additional information at end of sectionError/Message Description Cause/Solution/TroubleshootE.OL2Error LowSpeedOverloadOccurs if thelow frequency,standstill constantcurrent isexceeded (seeTechnicalData for stallcurrent levelsand overloadcharacteristics).The error can onlybe reset if thecooling timehas elapsedand E.nOL2 isdisplayed.The cause of the Low Speed Overload would be due toexcessive current at low speed (typically below 3Hz). Thefollowing may be causes of excessive current:Incorrect motor data.Verify motor data , specifi cally the motor ratedspeed and frequency relationship for PMSynchronous MotorsVerify correct encoder settings including:LF.27 Encoder Pulse NumberLF.28 Swap Encoder Channels (A/B setting)LF.77 Encoder Pole position for PM SynchronousMotors. Relearn Encoder Pole Position as needed(see Section 5.11.1 )High mechanical load/issues (friction) such asstarting or stopping against brake.E.dOHError MotorOverheatThe externalmotor temperaturesensor tripped.If a motor PTC temperature sensor, relay, or KTY(special hardware required) is connected to terminalsT1, T2 and the motor overheat function US.33 EdOHFunction = On, then if the PTC resistance exceeds 1650Ohms, relay opens.Cause of excessive motor heating may include:Excessive current.Verify correct motor data.Verify correct encoder settings including:LF.27 Encoder Pulse NumberLF.28 Swap Encoder Channels (A/B setting)LF.77 Encoder Pole position for PMSynchronous Motors.High mechanical load/issues (friction).Insufficient motor cooling.
