Delta Electronics AC Drive VFD-F Series Spezifikationen PDF herunterladen (Seite 74)

VFD-F Series

5-41

 This parameter is used with slip compensation Pr.7-04 to Pr.7-05 and electronic thermal relay

Pr.6-06 to Pr.6-07. An incorrect setting will cause these functions to not work incorrectly 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%) the rated

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 will cause

the function to work incorrectly and may damage the motor and drive.

 If the no-load current of the motor is unavailable, it may be found by running the motor with no load

and reading the current on the keypad display.

07 - 04

Auto Slip Compensation Gain



Factory Setting: 0.0

Settings 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 induction motor

characteristic. The difference between synchronization speed and rotor speed is called slip frequency.

Slip frequency is in direct proportion with output torque and output current. Therefore, slip

compensation could make rotor speed and master frequency command 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)). If rated

current of AC drive is 150A, full-load current of the motor is 120A, no-load current is 40A, rated slip

frequency is 5Hz and output current of AC drive is 100A. At this time, slip compensation is (07-04)

X 5 X (100-40) / (120-40) = 3.75 X (07-04). If 07-04 is set to 1.0 and the compensation is 3.75. If

master frequency command is set to 50Hz and output frequency is 53.75.

 Output frequency after compensation is limited by 01-07 upper bound frequency. When using slip

compensation, 01-07 should be set to the suitable value.

 When PID feedback control, slip compensation function will be disabled.

 Unsuitable setting value may cause over compensation.

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Delta Electronics AC Drive VFD-F Series Spezifikationen Seite 74