Emotron FDU Series, Инструкция по эксплуатации, Страница: 220 / 260

216 Technical Data CG Drives & Automation 01-7491-01r0
14.3 Operation at higher
temperatures
Most Emotron AC drives are made for operation at
maximum of 40 °C (104 °F) ambient temperature.
Frame sizes C69/D69/C2(69)/D2(69) are rated at 45 °C
(113 °F). However, it is possible to use the AC drive at
higher temperatures with reduced output rating.
14.3.1 Possible derating
Derating of output current is possible with
-1% / degree Celsius to max +15 °C * (= max temp 55 °C) or
-0.55%/ degree Fahrenheit to max +27 °F
(= max temp. 131 °F).
* max +10 °C for sizes C69/D69/C2(69)/D2(69).
Example
In this example we have a motor with the following data that
we want to run at the ambient temperature of
45 °C (113 °F):
Voltage 400 V
Current 72 A
Power 37 kW (50 hp)
Select AC drive
The ambient temperature is 5 °C (9 °F) higher than the
maximum ambient temperature. The following calculation
is made to select the correct AC drive model.
Derating is possible with loss in performance of
1%/°C (0.55%/ degree F).
Derating will be: 5 x 1% = 5%
Calculation for model FDU48-074
74 A - (5% x 74) = 70.3 A; this is not enough.
Calculation for model FDU48-090
90 A - (5% x 90) = 85.5 A
In this example we select the FDU48-090.
14.4 Operation at higher
switching frequency
Table 58 shows the switching frequency for the different AC
drive models. With the possibility of running at higher
switching frequency you can reduce the noise level from the
motor. The switching frequency is set in menu [22A],
Motor sound, see section section 11.2.2, page 99. At
switching frequencies >3 kHz derating might be needed.
Table 58 Switching frequency
Models
Standard
Switching
frequency Range
FDU##-002 to FDU##-3K0 3 kHz
1.5–6 kHz
FDU##-293, -295 and -365 2kHz