Delta Electronics VFD-M manual Pr.52, Pr.53, Pr.54, Pr.55

Chapter 4 Parameters

Example 8:

This example shows how to set up the “anti-slope”, which is an inversely proportional variation of frequency to the input analog signal, required for some applications in process control. A sensor will generate a large signal (such as 20mA or 10V) and the AC Drive will slow or stop.

Max.

Output Pr.03

Freq.

60Hz			Factory Settings
	anti-slope
			Pr.03=60Hz--Max. output Freq.
			Pr.48=100%--bias adjustment
			Pr.49=1 -- bias polarity
			Pr.50=100% -- pot. freq. gain
			Pr.51=1 -- REV. motion enable
0Hz			in negative bias
0V		10V
4mA		20mA

30

600

0V Hz 10V

4mA 20mA

Potentiometer Scale

Pr.52	Motor Rated Current	Unit: 0.1A
	Settings 30.0% FLA to 120.0% FLA	Factory Setting: FLA

Factory setting is the AC drive rated current. When setting this parameter, just input the motor rated current value without any calculation.

Use the following criteria to determine the setting of this parameter: no-load current < rated current of motor < rated current of AC drive. You can use this parameter to limit the output current to the motor as to prevent overheat.

Pr.53	Motor No-Load Current	Unit: 0.1A
	Settings 00%FLA to 99%FLA	Factory Setting: 0.4*FLA

The rated current of the AC drive means 100%. Setting of this parameter affects the slip compensation. The setting value must be smaller than the motor rated current setting in Pr.52. (this parameter displays the value of actual current.)

Pr.54	Torque Compensation
	Settings 00 to 10	Factory Setting: 00

This parameter forces the AC drive to increase its voltage output during start-up in order to obtain a higher initial starting torque.

Pr.55	Slip Compensation
	Settings 0.00 to 10.00	Factory Setting: 0.00

Revision May 2008, ME14, SW V3.04 4-47