ABB ACS800-U7, Руководство по оборудованию

Страница: 124 / 148

Technical data
124
Symbols
Note: The ratings apply at an ambient temperature of 40 °C (104 °F). At lower temperatures the ratings
are higher.
Sizing
See page 115 .
Derating
See page 115 .
Fuses
For branch circuit protection per NEC, the drive is equipped with UL class T or L
fuses listed below. Fast acting class T/L 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 in section
Fuses on page 116 .
Note 1: See also Planning the electrical installation : Thermal overload and short-circuit protection .
Note 2: In multicable installations, install only one fuse per phase (not one fuse per conductor).
Note 3:
Larger fuses than the recommended ones must not be used.
Note 4: Fuses from other manufacturers can be used if they meet the ratings and the melting curve of
the fuse does not exceed the melting curve of the fuse mentioned in the table.
Note 5: Circuit breakers must not be used without fuses.
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 (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 (460 V or
575 V).