Fuji Electric FRENIC-HVAC User Manual page 366

Select motor characteristics (F10)

F10 selects the cooling mechanism of the motor--shaft-driven or separately powered cooling
fan.
Data for F10
For a general-purpose motor with shaft-driven cooling fan
1
(The cooling effect will decrease in low frequency operation.)
For an inverter-driven motor, non-ventilated motor, or motor with separately
2 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 output frequencies f2 and f3 differ depending on 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
Nominal
Thermal time
applied
constant τ
motor
(Factory default)
(kW)
0.4, 0.75
1.5 to 3.7
5.5 to 11 5 min
15
18.5, 22
30 to 45
55 to 90
10 min
110 or above
Function
Reference current Output frequency for motor
for setting the
thermal time
constant (Imax)
Allowable continuous
drive current × 150%
frequency
× 33%
6-56
Characteristic
characteristic factor
f2 f3 α1
75
7 Hz
85
5 Hz 6 Hz 90
7 Hz 85
5 Hz 92
54
Base
Base
51
frequency
× 83%
53
factor (%)
α2 α3
85 100
85 100
95 100
85 100
100 100
85 95
95 95
85 90