Design Guide | VLT® AutomationDrive FC 360
NOTICE
The automatic derating is different when parameter 14-55 Output Filter is set to [1] Sine-Wave Filter.
3.2.10 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 efficiency. Under light load, the voltage is reduced and the motor current is minimized. The motor benefits from:
l Increased efficiency.
l Reduced heating.
l Quieter operation.
There is no need to select a V/Hz curve because the drive automatically adjusts motor voltage.
3.2.11 Automatic Switching Frequency Modulation
The drive generates short electrical pulses to form an AC wave pattern. The switching frequency is the rate of these pulses. A low
switching frequency (slow pulsing rate) causes audible noise in the motor, making a higher switching frequency preferable. A high
switching frequency, however, generates heat in the drive that can limit the amount of current available to the motor.
Automatic switching frequency modulation regulates these conditions automatically to provide the highest switching frequency
without overheating the drive. By providing a regulated high switching frequency, it quiets motor operating noise at slow speeds, when
audible noise control is critical, and produces full output power to the motor when required.
3.2.12 Automatic Derating for High Switching Frequency
The frequency range depends on power size and voltage rating. A switching frequency exceeding the maximum allowed range
generates increased heat in the drive and requires the output current to be derated.
An automatic feature of the drive is load-dependent switching frequency control. This feature allows the motor to benefit from as high a
switching frequency as the load allows.
3.2.13 Power Fluctuation Performance
The drive withstands mains fluctuations such as:
l Transients.
l Momentary drop-outs.
l Short voltage drops.
l Surges.
The drive automatically compensates for input voltages ±10% from the nominal to provide full rated motor voltage and torque. With
auto restart selected, the drive automatically powers up after a voltage trip. With flying start, the drive synchronizes to motor rotation
before start.
3.2.14 Resonance Damping
Resonance damping eliminates the high-frequency motor resonance noise. Automatic or manually selected frequency damping is
available.
3.2.15 Temperature-controlled Fans
Sensors in the drive regulate the operation of the internal cooling fans. Often, the cooling fans do not run during low load operation, or
when in sleep mode or standby. These sensors reduce noise, increase efficiency, and extend the operating life of the fan.
Danfoss A/S © 2024.01 AJ435824192086en-000101 / 130R1295 | 17
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