101
Selection and protection of a motor
4.9 Selection and protection of a motor
4.9.1
Motor overheat protection (Electronic thermal O/L relay, PTC thermistor protection)
(Pr. 9, Pr. 561, Pr.600 to Pr.604)
These parameters can be set when
Pr. 160 Extended function display selection
= "0".
Refer to page
for the rated motor current.
The value left of the slash is for the 2.2K drive unit or lower. The one right of the slash is for the 3.7K drive unit.
If a value exceeding the upper speed limit of the motor is set, the actual operation will be limited at the maximum rotation speed. The setting range is for the
S-PM motor. The maximum setting value differs depending on the number of poles of the applied motor.
........Specifications differ according to the date assembled.
to check the SERIAL number.
Purpose
Parameter that should be Set
Refer to Page
Motor protection from overheat
Electronic thermal O/L relay
PTC thermistor protection
Pr. 9, Pr. 561
To set the overheat protection
characteristics for the motor
Free thermal O/L relay
setting
Pr.600 to Pr.604
To select the motor to be used
Applied motor
Pr.71
To run by maximizing the
performance of the motor
Offline auto tuning
Pr.9, Pr.71, Pr.80, Pr.81, Pr.83,
Pr.84, Pr.90, Pr.92, Pr.93, Pr.96,
Pr.672, Pr.702, Pr.706, Pr.707,
Pr.711, Pr.712, Pr.717, Pr.721,
Pr.724 to Pr.726, Pr.859
Set the current of the electronic thermal relay function to protect the motor from overheat. This feature provides the
optimum protective characteristics, including reduced motor cooling capability, at low speed.
Parameter
Number
Name
Initial Value
Setting Range
Description
9
Electronic thermal O/L
relay
Rated motor
current
0 to 500A
Set the rated motor current.
561
PTC thermistor protection
level
9999
0.5 to 30k
Set the level (resistance value) for PTC
thermistor protection activates.
9999
PTC thermistor protection is inactive.
600
Free thermal reduction
speed 1
9999
0 to 12000r/min /
0 to 8000r/min
,
9999
The electronic thermal O/L relay operation
level can be changed to match the motor
temperature characteristics with the
combination of these three points
(Pr.600,
Pr.601), (Pr.602, Pr.603), (Pr.604, Pr.9)
.
9999: Free thermal O/L relay invalid.
601
Free thermal reduction
ratio 1
100%
0 to 100%, 9999
602
Free thermal reduction
speed 2
9999
0 to 12000r/min /
0 to 8000r/min
,
9999
603
Free thermal reduction
ratio 2
100%
0 to 100%, 9999
604
Free thermal reduction
speed 3
9999
0 to 12000r/min /
0 to 8000r/min
,
9999
Summary of Contents for FR-D720-0.2K-G
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