Nidec Commander C200 Power Installation Manual page 18

Table 2-4 Protective ground cable ratings
Input phase conductor size
2
≤ 10 mm
2
> 10 mm and ≤ 16 mm
2
> 16 mm and ≤ 35 mm
2
> 35 mm
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 2-5 Typical overload limits
Operating mode
Normal Duty overload with motor rated
current = drive rated current
Heavy Duty overload with motor rated
current = drive rated current (size 8 and
below)
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.
The maximum overload level which can be attained is independent of the speed.
NOTE
Output current
The continuous output current ratings given on the rating label are for maximum 40 C (104 F),
1000 m altitude and 3 kHz switching frequency. Derating is required for higher switching frequencies,
ambient temperatures >40 C (104 F) and higher altitude. For derating information, refer to section
5.1.2 Power and current ratings (Derating for switching frequency and temperature) on page 84.
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.
18
2
Either 10 mm or two conductors of the same cross-sectional area as the input
phase conductor
2
The same cross-sectional area as the input phase conductor
2 2
16 mm
Half of the cross-sectional area of the input phase conductor
RFC from cold RFC from 100 %
110 % for 165 s
200 % for 28 s
Minimum ground conductor size
110 % for 9 s
200 % for 3 s
Unidrive M/HS Frame 5 to 6 Power Installation Guide
Open loop Open loop
from cold from 100 %
110 % for 165 s 110 % for 9 s
150 % for 60 s 150 % for 7 s
Issue Number: 8