MasterDrive MC Configuration

[cltoh77]

Hi all, I had few sets of MasterDrive MC Compart +(6ES7015-0EP50) with Siemens servo motor. I'm going to use Basic positioning (Free block 788 and 789). Basically all of the drives have the similar application, the only difference is the gear ratio and ball screw pitch. I had configured 4 sets, but the results all difference. First set the motor take a long time for deceletion and standtill. The 2nd set driver shown the motor current up to 3.1 amp, but the motor didn't rotate, after certain time, driver prompt a error. The 3rd set is functional ok. I can control the position and speed, acceletion and deceletion seems ok. The 4th set I can control the jog speed thru setting the parameter P448 and P449, but when I turn on the control word 1 bit 0 (ramp-function generator), the speed setpoint is not same with n860.1 [789a.7]. The way I configured the driver are the same, 1. I using assisted commisioning to iniaitize the drive, 2. enable u953.30, u953.60, u953.61, u953.62 to 4 3. change u858.1 =0, u858.2 = -1 4. the rest of the parameters I had set included P172, 173, 174, 179, 183.1, 190, 209, 210, 211, 443, 448, 449, 734, u535, u539, u863, u866, u867 and u868. Hopefully someone can tell me why all the drives performed difference, even through I try to set all the parameter the same. If need further information, please feel free to raise up. Thanks in advance. Regards, CLToh