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Technical data

108

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 (3300 ft), or if the ambient temperature exceeds 40 °C

(104 °F).

Temperature derating

In the temperature range +40 °C (+104 °F) to +50 °C (+122 °F) the rated output

current is decreased 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 · I

or 0.90 · I

2hd

Altitude derating

In altitudes from 1000 to 4000 m (3300 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 58.

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.

Frame sizes R2 to R4

Check from the fuse time-current curve that the operating time of the fuse is

below 0.5 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 below in section Frame sizes R5 and R6.

Note 1: See also Planning the electrical installation: Thermal overload and short-circuit protection. For

UL recognized fuses, see NEMA data on page 118.

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.

°C

ABB ACS800-01-0070-3 User Manual

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