Delta Electronics VFD-M manual Pr.58, Pr.59

Chapter 4 Parameters

This parameter can be used to compensate motor slip. Although no linear, it typically adds 6Hz for a setting of 10 if Pr.03=60 Hz. When the output current of the AC drive is greater than the motor no-load current (Pr.53), the AC drive will adjust its output frequency according to this parameter.

Pr.56 Reserved

Pr.57 Rated Current Display of the AC motor drive
Settings Read Only	Factory Setting: ##.#

Pr.57 displays the rated current of the AC motor drive. By reading this parameter the user can check if the AC motor drive is correct. See Pr.80 for details.

Pr.58 Electronic Thermal Overload Relay Selection

Factory Setting: 02

Settings 00 Standard Motor (self cool motor)

01Inverter Motor (auxiliary cool fan on motor)

02Inactive

This function is used to limit the output power of the AC drive when powering a “self-cooled motor” at low speed.

Pr.59	Electronic Thermal Motor Overload
	Settings 30 to 300sec

Unit: 1 second Factory Setting: 60

The parameter determines the time required to activate the I2t electronic thermal motor overload protection. The graph below shows I2t curves at 150% output power for 1 minute.

Operation time(min)

5

4

3

2

1

60Hz or more

50Hz

10Hz

5Hz

Load factor

(%)

0 20 40 60 80 100 120 140 160 180 200

4-48 Revision May 2008, ME14, SW V3.04