Oper ating Instr u ctions CM Synchronous Ser v omotors 29 7 Malfunctions 7 M alfunctions 71 M otor faults 72 Faults during operation with servo controller The symptoms described in the section Motor faults may also occur when the motor is operated with a servo controlle r Please refer to the serv o controller operating instruc tions for the significance of the problems which occur and to find information about rectifying the problems Fault Possible cause Remedy Motor does not st art up Interruption in connecti ng harness C heck connections correct if necessary Fuse blown F it new fuse Motor protection has tripped C heck motor protec tion for correct setting correct fault if necessary Incorrect direction of rot a tion Motor connecte d incorrectly Check inverter check setpoint s Motor hums and has high current consumption Drive is blocked C heck drive Brake does not release section Brake fault s Fault on encoder cable C heck encoder cable Motor heat s up excessively measure temperature Overload Perform power measuremen t use larger motor or reduce load if necessary Inadequate cooling C orrect cooling air supply or clear cooling air p a ssages retrofit forced cooling fan if necessary Ambient temperature too high Adhere to permitted temperature range Forced cooling fan does not run C heck connection correct if necessary Rated operation type S1 to S10 DIN 57530 exceeded eg through excessive st arting frequency Adjust rated operation type of motor to required operating conditions if necessary call in a specialist to determine the correct drive Running noise on motor B earing damage C onsult with SEW EURODRIVE customer service Please have the following information r eady when cont acting customer service N ameplate dat a complete N ature and extent of the fault T ime and peripheral circumst ances of the fault P resumed cause