TECO F33 Series, Инструкция по эксплуатации, Страница: 171 / 192

168 Technical Data
14.3 Operation at higher
temperatures
Most TECO variable speed drives are made for opera-
tion at maximum of 40°C ambient temperature. How-
ever, for most models, it is possible to use the VSD at
higher temperatures with little loss in performance.
Table 44 shows ambient temperatures as well as derat-
ing for higher temperatures.
Example
In this example we have a motor with the following data
that we want to run at the ambient temperature of
45°C:
Voltage 400 V
Current 68 A
Power 37 kW
Select variable speed drive
The ambient temperature is 5 °C higher than the maxi-
mum ambient temperature. The following calculation is
made to select the correct VSD model.
Derating is possible with loss in performance of 2.5%/
°C.
Derating will be: 5 X 2.5% = 12.5%
Calculation for model JNFX40-0073
73 A - (12.5% X 73) = 63.875A; this is not enough.
Calculation for model JNFX48-0090
90 A - (12.5% X 90) = 78.75 A
In this example we select the JNFX48-0090.
14.4 Operation at higher
switching frequency
Table 41 shows the switching frequency for the differ-
ent VSD 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 11.2.3,
page 67. At switching frequencies >3 kHz derating
might be needed.
Table 44 Ambient temperature and derating 400–690 V types
Model
IP20 IP54
Max temp. Derating: possible Max temp. Derating: possible
JNFX**-0003 to JNFX**-0046 – – 40°C Yes, -2.5%/°C to max +10°C
JNFX**-0060 to JNFX40-0073 40°C Yes, -2.5%/°C to max +10°C 35°C Yes, -2.5%/°C to max +10°C
JNFX48-0090 to JNFX48-0250
JNFX69-0090 to JNFX48-0175 – – 40°C Yes,-2.5%/°C to max +5°C
JNFX48-0300 to JNFX48-1500
JNFX69-0210 to JNFX69-1000 40°C -2.5%/°C to max +5°C 40°C -2.5%/°C to max +5°C
Table 45 Switching frequency
Models
Standard
Switching
frequency Range
JNFX**-0003 to JNFX**-0073 3 kHz 1.5–6 kHz
JNFX**-0090 to JNFX**-1500 3 kHz 1.5–6 kHz