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6 Product Features
6.1 Automated Operational Features
6.1.1 Automatic Energy Optimization
Automatic energy optimization (AEO) directs the drive to monitor the load on the motor continuously and adjust the output voltage
to maximize eciency. Under light load, the voltage is reduced and the motor current is minimized. The motor benets from:
Increased eciency.
Reduced heating.
Quieter operation.
When using induction motors, the drive can optimize the energy eciency of the motor in part load conditions by reducing the
magnetization of the motor. This leads to reduced losses in the motor.
The updated AEO function features improved dynamics. This means that the AEO function can also be used in applications where a
higher starting torque is required (for example, waste water pumps) or there are step load changes (such as conveyors). There is no
need to select a V/Hz curve because the drive automatically adjusts motor voltage.
Start with high acceleration AEO-adjustment
Automatic load
adjustment
Motor voltage
Motor current
Illustration 23: Automatic Energy Optimization
The AEO requires correct advanced motor data meaning that a complete automatic motor adaptation (AMA) has to be run.
6.1.2 Short-circuit Protection
Motor (phase-to-phase)
The drive is protected against short circuits on the motor side by current measurements in each of the 3 motor phases. A short
circuit between 2 output phases causes an overcurrent in the inverter. The inverter is turned o when the short circuit current ex-
ceeds the allowed value (Alarm 16, Trip Lock).
Mains side
A drive that works correctly limits the current it can draw from the supply. Still, it is recommended to use fuses and/or circuit break-
ers on the supply side as protection if there is a component breakdown inside the drive (1
st
fault). Mains side fuses are mandatory
for UL compliance.
N O T I C E
To ensure compliance with IEC 60364 for CE or NEC 2017 for UL, it is mandatory to use fuses and/or circuit breakers.
Brake resistor
The drive is protected from a short circuit in the brake resistor.
Load sharing
To protect the DC bus against short circuits and the drives from overload, install DC fuses in series with the load sharing terminals of
all connected units.
AJ300847815559en-000101 / 130R0337 | 37Danfoss A/S © 2020.09
Product Features
VLT® AQUA Drive FC 202
Design Guide
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