386 Technical data
Sizing
Drive sizing is based on the rated motor current and power. 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. The rated power of the drive must also be higher
than or equal to compared to the rated motor power. The power ratings are the same
regardless of the supply voltage within one voltage range.
In multimotor systems, the drive output current rating I
LD
must be equal to or greater
than the calculated sum of the input currents of all motors.
Note:
• The maximum allowed motor shaft power is limited to 1.5 · P
N
. If the limit is
exceeded, motor torque and current are automatically restricted. The function
protects the input bridge of the drive against overload.
• The ratings apply at ambient temperature of 40 °C (104 °F) for I
2N
and 50 °C
(122 °F) for I
LD
.
Derating
The load capacity decreases if the installation site ambient temperature exceeds
40 °C (104 °F) or if the altitude exceeds 1000 meters (3300 ft).
Temperature derating
In the temperature range +40 °C…+50 °C (+104 °F…+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 · I
2N
(where I
2N
= continuous output at 40 °C, 0% overload)
Altitude derating
In altitudes 1000…2000 m (3300…6600 ft) above sea level, the derating is 1% for
every 100 m (330 ft).
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