5-41
F10 to F12
Electronic Thermal Overload Protection for Motor 1
(Select motor characteristics, Overload detection level, and Thermal time constant)
F10 through F12 specify the thermal characteristics of the motor for its electronic thermal overload protection that is
used to detect overload conditions of the motor.
Upon detection of overload conditions of the motor, the inverter shuts down its output and issues a motor overload
alarm
0l1
to protect motor 1.
• Ther
al characteristics of the motor specified by F10 and F12 are also used for the overload early warning.
Even if you need only the overload early warning, set these characteristics data to these function codes.
(Refer to the description of E34.)
• For Fuji motors exclusively designed for vector control, you need not specify the electronic thermal
overload protection with these function codes, because they are equipped with motor overheat protective
function by NTC thermistor. Set F11 data to "0.00" (Disable) and connect the NTC thermistor of the moto
overheat protective function. For details, refer to the description of H26.
Select motor characteristics (F10)
F10 selects the cooling mechanism of the motor--shaft-driven or separately powered cooling fan.
Data for F10 Function
1
For a general-purpose motor with shaft-driven cooling fan
(The cooling effect will decrease in low frequency operation.)
2
For an inverter-driven motor, non-ventilated motor, or motor with separately powered cooling fan
(The cooling effect will be kept constant regardless of the output frequency.)
The figure below shows operating characteristics of the electronic thermal overload protection when F10 = 1. The
characteristic factors α1 through α3 as well as their corresponding switching frequencies f
2 and f3 vary with the
characteristics of the motor. The tables below list the factors of the motor selected by P99 (Motor 1 Selection).
Cooling Characteristics of Motor with Shaft-driven Cooling Fan
Nominal Applied Motor and Characteristic Factors when P99 (Motor 1 selection) = 0 or 4
Output frequency for motor
characteristic factor
Characteristic
factor (%)
Nominal applied
motor (kW)
Thermal time
constant τ
(Factory default)
Reference current
for setting the
thermal time
constant (Imax)
f
2 f3 α1 α2 α3
0.4, 0.75 75 85 100
1.5 to 3.7 (4.0) *
7 Hz
85 85 100
5.5 to 11 6 Hz 90 95 100
15 7 Hz 85 85 100
18.5, 22
5 min 5 Hz
5 Hz 92 100 100
30 to 45 54 85 95
55 to 90 51 95 95
110 or above
10 min
Allowable
continuous current
× 150%
Base frequency
× 33%
Base frequency
× 83%
53 85 90
* 4.0 kW for the EU.
Nominal Applied Motor and Characteristic Factors when P99 (Motor 1 Selection) = 1 or 3
Output frequency for
motor characteristic factor
Characteristic
factor (%)
Nominal applied
motor (kW)
Thermal time
constant τ
(Factory default)
Reference current
for setting the
thermal time
constant (Imax)
f
2 f3 α1 α2 α3
0.2 to 22 5 min
Base frequency
× 33%
69 90 90
30 to 45 54 85 95
55 to 90 51 95 95
110 or above
10 min
Allowable
continuous current
× 150%
Base frequency
× 33%
Base frequency
× 83%
53 85 90
If F10 is set to "2," changes of the output frequency do not affect the cooling effect. Therefore, the overload detection
level (F11) remains constant.
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