Ratings - Nidec Power Module Frame 12 Power Installation Manual

Universal variable speed ac drive for induction and servo motors

Table of Contents

Safety information

2.4

Ratings

The continuous current ratings given are for maximum 40 °C (104 °F),1000 m altitude and 2 kHz switching frequency. Derating is required for higher switching

frequencies, higher ambient temperatures and high altitude. For further information, refer to section 5 Technical data, Power and current ratings (Derating for

switching frequency and temperature).

NOTE

With regard to Table 2-1 to Table 2-2, derating is applied to all drives at low output frequencies. Please contact the supplier of the drive for more

information if the application requires significant torque, at or close to zero speed for extended periods of time or if prolonged periods of overload

(> 100 %) are required.

Table 2-1

400 V drive ratings at 40 °C (104 °F) 12 pulse (380 V to 480 V ±10 %)

No overload

Maximum

Nominal

Model

continuous

power at

output

current

12404800T

635

12405660T

689

12406600T

788

12407200T

903

2.4.1

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. The exact value for a specific motor can be calculated using the

equations detailed in Menu 4 in the Advanced User Guide.

Typical values are shown in the table below for RFC and open loop (OL) modes:

Table 2-2

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

* 1240720T rating provides 110 % for 3 s from rated normal duty current. 110 % is available for 10 s when limited to 850 A continuous.

12406600T and 12405660T support 110 % for 10 s.

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.

NOTE

The maximum overload level which can be attained is independent of the speed.

Product information