Output Current Derating For High Ambient Temperature - ABB ACS 600 Hardware Manual

Symbols Used in Rating Table
Normal use (10% overload capacity):
I rated RMS output current
2N
I short term rms overload current (allowed
2Nmax
for one minute every 10 minutes).
S rated apparent output power
N
P typical motor power. The power ratings in
N
kW apply to most IEC 34 motors. The
power ratings in HP apply to most four pole
NEMA rated motors.
Output Current
Derating For High
Ambient Temperature
ACx 601 Drives
601/604/607 US Supplement
Heavy-duty use (50% or 100% overload capacity):
I
2hd
I
2hdmax
S
hd
P
hd
When the ambient temperature of the air around the drive exceeds the
rated temperature, the rated output current is decreased by some
percentage of the normal current rating for every degree above the
rated temperature. The output current is calculated by multiplying the
I current given in the rating table by a derating factor determined
2N
from the derating curves. The derating factor is determined by the
ambient temperature, the type of enclosure and the duty classification.
Note:Curve numbers refer to the Derate Curves and the Derate Table
which immediately follow the derating instructions. Maximum
temperature in all cases should not exceed 50 ° C.
For IP 21/22 enclosures with Normal Use:
Below +40 ° C: Apply curve 1 (no derate) to I
except model ACx 601-0100-2 which requires application of
curve 2.
Above +40 ° C: Decrease I
40 ° C. Reduction should begin from the value applicable at 40 ° C
(i.e., 92% of I for ACx 601-0100-2, 100% for all other drives).
2N
For IP 21/22 enclosures with Heavy Duty Use:
Below +40 ° C: Use the I
Output Ratings table. No derating is required.
Above +40 ° C: Calculate a tentative derated current per the IP 21/
22 Normal Use, Above +40 ° C instructions above. Compare this
calculated value with the I
Ratings table. The current rating equals the smaller of I
Drive Output Ratings table or the calculated derated current.
Appendix A – ACS/ACC 600 Technical Data
rated RMS output current
rms overload current (allowed for one
minute every 10 minutes or 2 seconds
every 15 seconds) Maximum current
depends on parameter setting, refer to
Firmware Manual.
rated apparent output power
typical motor power. The power ratings in
kW apply to most IEC 34 motors. The
power ratings in HP apply to most four pole
NEMA rated motors.
2N
by 3.5% for every 1 ° C above
2N
current rating given in the Drive
2HD
current given in the Drive Output
2HD
for all drives
from the
2HD
A-3