Delta Electronics VFD-M Series User Manual page 83

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
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
Settings 00
01
02
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
The parameter determines the time required to activate the I
overload protection. The graph below shows I
4-48
Standard Motor (self cool motor)
Inverter Motor (auxiliary cool fan on motor)
Inactive
Operation
time(min)
5
4
3
2
1
0 20 40 60 80 100 120 140 160 180 200
2
t electronic thermal motor
2
t curves at 150% output power for 1 minute.
60Hz or more
50Hz
10Hz
5Hz
Load
factor
(%)
Revision May 2008, ME14, SW V3.04
Factory Setting: ##.#
Factory Setting: 02
Unit: 1 second
Factory Setting: 60