ABB AM801F ACS800F programmable controller
Symbols
Sizing
The current ratings are the same regardless of the supply voltage within one voltage
range. To achieve the rated motor power given in the table, the rated current of the
drive must be higher than or equal to the rated motor current.
Note 1: The maximum allowed motor shaft power is limited to 1.5 · Phd, 1.1 · PN or
Pcont.max (whichever value is greatest). If the limit is exceeded, motor torque and
current are automatically restricted. The function protects the input bridge of the
drive against overload. If the condition exists for 5 minutes, the limit is set to
Pcont.max.
Note 2: The ratings apply at ambient temperature of 40 °C (104 °F). In lower
temperatures the ratings are higher (except Imax).
Note 3: Use the DriveSize PC tool for a more accurate dimensioning if the ambient
temperature is below 40 °C (104 °F) or the drive is loaded cyclically.
Derating
The load capacity (current and power) decreases if the installation site altitude
exceeds 1000 metres (3281 ft), or if the ambient temperature exceeds 40 °C
(104 °F).
Note: If the ingoing cooling air temperature of the drive module is max. 40 °C
(104 °F), no derating of the drive output current is needed despite the cabinet
temperature rising over 40 °C (104 °F).
Nominal ratings
Icont.max continuous rms output current. No overload capability at 40 °C (104 °F).
Imax maximum output current. Available for 10 s at start, otherwise as long as allowed by
drive temperature.
Typical ratings:
No-overload use
Pcont.max typical motor power. The power ratings apply to most IEC 60034 motors at the nominal
voltage, 230 V, 400 V, 500 V or 690 V.
Light-overload use (10% overload capability)
2N continuous rms current. 10% overload is allowed for one minute every 5 minutes.
PN typical motor power. The power ratings apply to most IEC 60034 motors at the nominal
voltage, 230 V, 400 V, 500 V or 690 V.
Heavy-duty use (50% overload capability)
I2hd continuous rms current. 50% overload is allowed for one minute every 5 minutes.
Phd typical motor power. The power ratings apply to most IEC 60034 motors at the nominal
voltage, 230 V, 400 V, 500 V or 690 V.

Temperature derating
In the temperature range of +40 °C (+104 °F) to +50 °C (+122 °F), the rated output
current is decreased by 1% for every additional 1 °C (1.8 °F). The output current is
calculated by multiplying the current given in the rating table by the derating factor.
Example If the ambient temperature is 50 °C (+122 °F), the derating factor is
100% - 1 · 10 °C = 90% or 0.90.
The output current is then 0.90 · I2N , 0.90 · I2hd or 0.90 · Icont.max.
Altitude derating
At altitudes from 1000 to 4000 m (3281 to 13123 ft) above sea level, the derating is
1% for every 100 m (328 ft). For a more accurate derating, use the DriveSize PC
tool. See Installation sites above 2000 metres (6562 feet) on page 59.
Fuses
gG and aR fuses for protection against short-circuit in the input power cable or drive
are listed below. Either fuse type may be used if it operates rapidly enough. Choose
between gG and aR fuses according to the table under Quick guide for selecting
between gG and aR fuses on page 104, or verify the operating time by checking
that the short-circuit current of the installation is at least the value given in the
fuse table. The short-circuit current can be calculated as follows:
where
Ik2-ph = short-circuit current in symmetrical two-phase short-circuit (A)
U = network line-to-line voltage (V)
Rc = cable resistance (ohm)
Zk = zk · UN
2/SN = transformer impedance (ohm)
zk = transformer impedance (%)
UN = transformer rated voltage (V)
SN = nominal apparent power of the transformer (kVA)
Xc = cable reactance (ohm)