artisan Altivar 16 Series Podręcznik użytkownika - Strona 13
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Motor thermal protection
Motor thermal protection is provided :
2
.
- by I
t thermal protection of the speed controller if the rated current of the motor is equal to
0.9 times the rated current of the speed controller for use in a frequency range from 25/30 to
50/60 Hz,
- or by using a thermal probe built into the motor, if used with high torque at low speed.
Available torque
Continuous operation :
For self-ventilated motors, motor cooling is linked to speed.
Derating occurs at speeds of less than half rated speed.
For fractional power motors of ≤ 250 W, derating may be less
(for example : 20 % instead of 50 % at very low frequency).
Transient operation :
The possibility of overtorque depends on the maximum transient current which the
speed controller can provide.
(50 Hz)
(60 Hz)
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Typical torque characteristics
Torque
C/Cn
1.50
1.25
1
2
0.75
0.50
0.25
0
5Hz
0
6Hz
3
1
25
50
30
60
1
Self-ventilated motor
2
Force-ventilated motor
3
Transient overtorque
Frequency (Hz)
E
N
G
L
I
S
H
23