English
TECHNICAL SPECIFICATIONS
FD = FDta * FDfsw * FDal * FDothers
Where,
FD is the total derating factor;
FDta is the derating factor due to the inverter ambient temperature;
FDfsw is the derating factor due to the user-set switching frequency;
FDal is the derating factor due to installation altitude;
FDothers is the derating factor due to other factors.
8.2.2 Derating factor according to the Ambient Temperature (FDta)
The rated operating temperature of CFW900 is -10 °C to 50 °C (14 °F to 122 °F) for frames A ... D, and -10 °C to 45
°C (14 °F to 113 °F) in frame E, without the need to reduce the output current (Ta,nom= 50 °C (122 °F) for frame A
... D, and Ta,nom = 45 °C (113 °F) for frame E). This is valid considering the inverter factory settings (rated switching
frequency and thermal management function enabled)
(1)
. The thermal management function protects the inverter
during overloads through a smart control that limits the maximum temperature of the IGBTs. If it is not possible to
operate with a switching frequency below the rated one during overloads, disable the thermal management function
and consider 40 °C (104 °F) the maximum inverter temperature. The maximum inverter temperature is also 40 °C
(104 °F) when you want to use a switching frequency above the rated one.
(1)
This is also valid when the switching frequency is set at maximum of 2 kHz for frames A ... D and 1.5 kHz for frame E. In this case the
maximum ambient temperature of the inverter is independent of its thermal management function.
It is possible to operate CFW900 with an ambient temperature above the rated one by applying current derating,
as shown in
. The maximum operating ambient temperature is specified in
of this manual.
102 | CFW900
Summary of Contents for CFW900
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