12 Powerdrive F300 Getting Started Guide
Issue Number: 5
Table 2-6 Protective ground cable ratings
Typical short term overload limits
The maximum percentage overload limit changes depending on the selected motor. Variations in
motor rated current, motor power factor and motor leakage inductance all result in changes in the
maximum possible overload. Typical values are shown in the table below:
Table 2-7 Typical overload limits
Generally the drive rated current is higher than the matching motor rated current allowing a higher
level of overload than the default setting.
The time allowed in the overload region is proportionally reduced at very low output frequency on
some drive ratings.
Output current
The continuous output current ratings given on the rating label are for maximum 40 °C (104 °F), 1000
m altitude and 2.0 kHz switching frequency. Derating is required for higher switching frequencies,
ambient temperatures >40 °C (104 °F) and higher altitude. For derating information, refer to the Drive
User Guide.
Input current
The input current is affected by the supply voltage and impedance. The input current given on the
rating label is the typical input current and is stated for a balanced supply.
Input phase conductor size Minimum ground conductor size
≤ 10 mm
2
Either 10 mm
2
or two conductors of the same cross-sectional area as the input
phase conductor.
> 10 mm
2
and ≤ 16 mm
2
The same cross-sectional area as the input phase conductor
> 16 mm
2
and ≤ 35 mm
2
16 mm
2
> 35 mm
2
Half of the cross-sectional area of the input phase conductor
Operating mode RFC from cold RFC from 100 %
Open loop
from cold
Open loop
from 100 %
Normal Duty overload with motor rated
current = drive rated current
110 % for 165 s 110 % for 9 s 110 % for 165 s 110 % for 9 s
The maximum overload level which can be attained is independent of the speed.
Powerdrive F300 Getting Started Guide English Iss2.book Page 12 Tuesday, July 28, 2015 3:23 PM
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