ABB ACS880-34, Hardware Manual

Page: 189 / 256

Technical data 189

Derating for output voltage boosting
The drive can output a higher motor voltage than the supply voltage. This can require
derating of the drive output power depending on the difference between the supply voltage
and the output voltage to the motor for continuous operation.
This drawing shows the required derating for -3 and -5 (400 V and 500 V) drive types.
This drawing shows the required derating for -7 (690 V and 570 V) drive types.
P
N
Typical motor power in no-overload use.
I
Ld
Continuous rms output current allowing 10% overload for 1 minute every 5 minutes
P
Ld
Typical motor power for light-overload use.
I
Hd
Continuous rms output current allowing 50% overload for 1 minute every 5 minutes
* Continuous rms output current allowing 40% overload for 1 minute every 5 minutes
U Typical motor power in no-overload use
U
n
Nominal supply voltage of the drive. For -3 types U
n
= 400 V, for -5 types U
n
= 500 V. For -7
types U
n
= 690 V but 575 V when P
n
refers to nominal power ratings in the UL 575 V rating
tables.
P Derated ouput power of the drive
P
n
Nominal power rating of the drive
0.80 0.85 0.90 0.95 1.00 1.05 1.10
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
P / P
n
U / U
n
0.80 0.85 0.90 0.95 1.00 1.05 1.10
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
P / P
n
U / U
n