ABB ACS800-04, Hardware Manual

Page: 95 / 118

Technical data
95
3)
50% overload is allowed for one minute every five minutes if ambient temperature is less than 30 °C
(86 °F). 40% overload is allowed if ambient temperature is 40 °C (104 °F).
4)
available if ambient temperature is less than 30 °C (86 °F). If ambient temperature is 40 °C
(104 °F),
I
2N
is 704 A.
*
higher value available if output frequency is above 41 Hz
**
ACS800-U4 types only
Symbols
Note: The ratings apply at ambient temperature of 40 °C (104 °F). At lower temperatures the ratings
are higher.
Sizing
See page 85 .
Derating
See page 85 .
Fuses
UL class T or L fuses for branch circuit protection per NEC are listed below. Fast
acting class T or faster fuses are recommended in the USA.
Check from the fuse time-current curve that the operating time of the fuse is
below 0.1 seconds
. The operating time depends on the supply network impedance
and the cross-sectional area and length of the supply cable. The short-circuit current
can be calculated as shown on page
86 .
I
max
maximum output current. Available for 10 s at start, otherwise as long as allowed by drive
temperature.
Normal use (10% overload capability)
I
2N
continuous rms current. 10% overload is typically allowed for one minute every 5 minutes.
P
N
typical motor power. The power ratings apply to most 4-pole NEMA rated motors (230 V,
460 V or 575 V).
Heavy-duty use (50% overload capability)
I
2hd
continuous rms current. 50% overload is typically allowed for one minute every 5 minutes.
P
hd
typical motor power. The power ratings apply to most 4-pole NEMA rated motors (230 V,
460 V or 575 V).