102
Selection and protection of a motor
(1) Electronic thermal O/L relay
(Pr. 9)
This function detects the overload (overheat) of the motor and trips. (The operation characteristic is shown below)
Set the rated current (A) of the motor in
Pr. 9
.
Set "0" in
Pr. 9
when you do not want to operate the electronic thermal O/L relay, e.g. when using an external thermal relay with
the motor. (Note that the output transistor protection of the drive unit is activated (E.THT).)
To use the S-PM geared motor, perform the PM parameter initialization to automatically set the rated motor current for the
S-PM motor.
(2) Electronic thermal relay function pre-alarm (TH) and alarm (THP) signal
NOTE
The internal accumulated heat value of the electronic thermal relay function is reset by the drive unit's power reset or
a reset signal input. Avoid unnecessary resets and power-OFFs.
The alarm (THP) signal is output and electronic thermal relay function pre-alarm (TH) is displayed when the electronic
thermal O/L relay cumulative value reaches 85% of the level set in
Pr. 9
. If it reaches 100% of the
Pr. 9
Electronic thermal O/
L relay
setting electronic-thermal relay protection (E.THM) occurs.
The drive unit does not trip even when the alarm (THP) signal is output.
For the terminal used for the THP signal output, assign the function by setting "8 (positive logic) or 108 (negative logic)" in
Pr. 190
or
Pr. 192 (output terminal function selection)
.
100%: Electronic thermal O/L relay alarm operation value
NOTE
Changing the terminal assignment using
Pr. 190, Pr. 192 (output terminal function selection)
may affect the other functions.
Set parameters after confirming the function of each terminal.
200
105%
50
125
100
150
100
200
300
600
50
60
70
25
75
175
400
500
Second display in this range
Minute display in
this range
Operation time (min)
Operation time (s)
300r/min or more
Operation range
Range on the right of
characteristic curve
Non-operation range
Range on the left of
characteristic curve
0
The ratio of motor current to
Pr. 9 Electronic thermal O/L relay
Electronic thermal
relay function
operation level
Electronic thermal
O/L relay alarm
(THP)
OFF
ON
100%
85%
Time
ON
Summary of Contents for FR-D720-0.2K-G
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