VFD-F (CURVE).cdr

VFD-F Series This parameter is used with slip compensation Pr.7-04 to Pr.7-05 and electronic thermalrelay Pr.6-06 to Pr.6-07. An incorrect setting will cause these functions to not workincorrectly and may damage the motor and drive. The full-load current of the motor must be equal to or less than (but not less than 50%) therated current of the AC drive.07 - 03 No-load Current of Motor Factory Setting: 30%Settings 1~99% Unit: 1 This parameter sets the no-load current of the motor.Pr.7-03 = (no load current / drive rated current)Example: If the rated current of the AC drive is 150A and no-load current of the motor is 40A,then Pr.7-03 should be set to 27%. This parameter is used with slip compensation Pr.7-04 and Pr.7-05. An incorrect setting willcause the function to work incorrectly and may damage the motor and drive.5 If the no-load current of the motor is unavailable, it may be found by running the motor withno load and reading the current on the keypad display.07 - 04 Auto Slip Compensation Gain Factory Setting: 0.0Settings 0.0~3.0 Unit: 0.1 This parameter is set to auto slip compensation gain. Rotor speed of the motor (output frequency of AC drive) can’t synchronize due to inductionmotor characteristic. The difference between synchronization speed and rotor speed iscalled slip frequency. Slip frequency is in direct proportion with output torque and outputcurrent. Therefore, slip compensation could make rotor speed and master frequencycommand the same according output current (lo). The equation of slip compensation is (07-05) X (07-04) X (Io-(07-03)) / ((07-02)-(07-03)). Ifrated current of AC drive is 150A, full-load current of the motor is 120A, no-load current is40A, rated slip frequency is 5Hz and output current of AC drive is 100A. At this time, slipcompensation is (07-04) X 5 X (100-40) / (120-40) = 3.75 X (07-04). If 07-04 is set to 1.0and the compensation is 3.75. If master frequency command is set to 50Hz and outputfrequency is 53.75. Output frequency after compensation is limited by 01-07 upper bound frequency. Whenusing slip compensation, 01-07 should be set to the suitable value. When PID feedback control, slip compensation function will be disabled.DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 5-37