Efficiency; Acoustic Noise; Du/Dt Conditions - Danfoss VLT Decentral Drive FCD 302 Design Manual

Specifications
Ambient temperature
Temperature during storage/transport
Derating for high ambient temperature
Minimum ambient temperature during full-scale operation
Minimum ambient temperature at reduced performance
Maximum altitude above sea level
Derating for high altitude
Control card, USB serial communication:
USB standard
USB plug
Connection to PC is carried out via a standard host/device USB cable.
The USB connection is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
The USB ground connection is not galvanically isolated from protection earth. Use only an isolated laptop as PC connection to
6 6
the USB connector on the frequency converter.

6.4 Efficiency

Contact Danfoss Hotline for efficiency data.

6.5.1 Acoustic Noise

Contact Danfoss Hotline for acoustic noise data.

6.6.1 dU/dt Conditions

NOTE
380-690 V
To avoid premature ageing of motors (without phase
insulation paper or other insulation reinforcement) not
designed for frequency converter operation, Danfoss
strongly recommend to fit a dU/dt filter or a Sine-Wave
filter on the output of the frequency converter. For further
information about du/dt and Sine-Wave filters see the
Output Filters Design Guide.
When a transistor in the inverter bridge switches, the
voltage across the motor increases by a du/dt ratio
depending on:
- the motor cable (type, cross-section, length
screened or unscreened)
- inductance
The natural induction causes an overshoot U
motor voltage before it stabilises itself at a level
depending on the voltage in the intermediate circuit. The
rise time and the peak voltage U
of the motor. If the peak voltage is too high, especially
motors without phase coil insulation are affected. When
the motor cable is short (a few metres), the rise time and
peak voltage are lower.
Peak voltage on the motor terminals is caused by the
switching of the IGBTs. The frequency converter complies
with the demands of IEC 60034-25 regarding motors
88
®
VLT Decentral Drive FCD 302
in the
PEAK
affect the service life
PEAK
®
MG04H102 - VLT is a registered Danfoss trademark
Max. 40 °C (24-hour average maximum 35 °C)
designed to be controlled by frequency converters. The
frequency converter also complies with IEC 60034-17
regarding Norm motors controlled by frequency converters
Contact Danfoss Hotline for measured values from
laboratory tests.
-25 to +65/70 °C
0 °C
-10 °C
1000 m
1.1 (Full speed)
USB type B plug