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8 PARAMETER FUNCTIONS
8-32
8.5.7 Selection of motor tone
Initial value
Pr. 72 "motor tone selection" 1
Setting Range Unit
1 to 4
Increasing the setting will decrease noise (metallic tone) from the motor, but will increase the
electromagnetic noise amount generated from the drive unit.
8.5.8 Other settings
Initial value
Pr. 9 "electronic thermal O/L relay" 1
The motor thermal relay is used to protect the motor from overheat, and the transistor thermal relay
is used to protect the drive unit from overload. Normally set 1.
Setting Motor Thermal Relay Operation Transistor Thermal Relay Operation
0No Yes
1Yes Yes
<Electronic overcurrent protection curve>
180
120
60
0 50 100 150 180 200
Rated motor current ratio (%)
Operation time (s)
Motor thermal relay
Transistor thermal rela
y
protection operation region
Electronic overcurrent
MEMO
The electronic overcurrent protection curve is fixed independently of the motor
speed.
CAUTION
The electronic overcurrent protection function is initialized when the drive unit is
reset (power-off reset, or reset using RES terminal or key operation). Frequent
resetting of the drive unit will disable motor overheat protection and may cause the
motor to be burnt if it is operated under overload.