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Chapter 6 Parameter Description
90
0.35
1
1.75
3.5
5
10
100%
150%
200%
Motor current(%)
Action time
P9.18=10.0 Minutes
P9.18=5.0 Minutes
P9.18=1.0 Minutes
0
Fig.6
−
32 Motor Overload Protection Characteristics Curve (Constant Torque)
1: Sensor mode. Compare the analog feedback value of the thermal sensor installed on the motor with
the present sensor protection threshold P9.17. If the feedback value is higher than that protection
threshold, the inverter will report “E.Ptc” motor overheat failure immediately, without inverse time lag
characteristics.
Note: When this protection mode is employed, it needs to select the input channel for the analog
feedback value of the thermal sensor and confirm that the input function of this analog channel is
selected as “5: Motor Temperature Feedback”.
2: No motor protection action, indicating that the inverter will not protect the overload status of the motor.
It must be used with care.
Tens place of P9.16:
0: Action: The heat sink effect will become poorer when the motor is running at low speed and the motor
is derated according to the motor overload protection time as determined in P9.18.
1: No action: For some special motors, such as variable frequency motor, “no action” can be selected
when derating at low speed. It must be used with care.
