VLT
®
MICRO
Pr.58, Pr.59 – Electronic Thermal Overload Relay
Pr.58 De-rating for Output Current vs. Temperature
Factory Setting d02
Units None
Settings d00 Active with standard motor
d01 Active with special motor
d02 Inactive
To prevent self-cooled motors from over heating when running at low speeds, program
this parameter to limit the AC drive output power.
d00:The electronic thermal characteristics match a reduced torque motor
(standard motor).
d01:The electronic thermal characteristics match a constant torque motor
(special motor).
Pr.59 Activation Time for I
2
t Protection
Factory Setting d60
Units 1 Sec
Parameter value d30 - d300 Sec
This parameter programs the time required to activate the I
2
t electronic thermal
protection function. The activation time may be defined according to short, standard and
long time ratings.
Operation
time (min)
5
4
3
2
1
0 20 40 60 80 100 120 140 160 180 200
Load
factor (%)
60Hz or more
50Hz
10Hz
5Hz
150%
48
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