5.3 Description of Function Codes
5-64
■ Select motor characteristics (F10)
F10 selects characteristics of cooling system of the motor.
F10 data Function
1
Self-cooling fan of general-purpose motor (Self-cooling)
(When operating with low frequency, cooling performance decreases.)
2
Inverter-driven motor, High-speed motor with separately powered cooling fan
(Keep constant cooling capability irrespective to output frequency)
Figure 5.3-3 shows electronic thermal operation characteristics diagram when F10=1 is set. The characteristics
coefficient α1 and α3 and the switch coefficient f2, f3 differ depending on the characteristics of the motor.
Each coefficient that is set by motor characteristics that is selected by motor capacitance and motor selection
(P99) is shown in Table 5.3-2, Table 5.3-3 and Table 5.3-4.
Figure 5.3-3 Characteristics diagram of motor cooling system
Table 5.3-2 When P99 = 0, 4 (Motor characteristics 0, Other)
Motor capacity
Thermal time
constant τ
(Factory default)
Thermal time
constant setting
Standard current
value Imax
Characteristics coefficient
switch frequency
Characteristics
coefficient
f2 f3
α1 α2 α3
0.4, 0.75 kW
5 min
Continuous
allowance current
value x 150%
5 Hz
7Hz
75% 85% 100%
1.5 to 3.7 kW 85% 85% 100%
5.5 to 11 kW 6Hz 90% 95% 100%
15 kW 7Hz 85% 85% 100%
18.5, 22 kW 5Hz 92% 100% 100%
30 to 45 kW
10 min
Base
frequency ×
33%
Base
frequency ×
83%
54% 85% 95%
55 to 90 kW 51% 95% 95%
110 kW or above 53% 85% 90%
Table 5.3-3 When P99 = 1 (Motor characteristics 1)
Motor capacity
Thermal time
constant τ
(Factory default)
Thermal time
constant setting
Standard current
value Imax
Characteristics coefficient
switch frequency
Characteristics
coefficient
f2 f3
α1 α2 α3
0.2 to 22 kW 5 min
Continuous
allowance current
value x 150%
Base
frequency ×
33%
Base
frequency ×
33%
69% 90% 90%
30 to 45 kW
10 min
Base
frequency
× 83%
54% 85% 95%
55 to 90 kW 51% 95% 95%
110 kW or above 53% 85% 90%
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