134U7728
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MPN: FC-280PK55T4E20H1BXCXXXSXXXXAL
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The 134U7728 is a compact drive with a power rating of 0.55 kW and dimensions of 210x75x168 mm. Manufactured by Danfoss as part of the VLT FC 280 Midi Drives series, it supports asynchronous and synchronous motor types with a supply voltage of 400 V AC. It features an integrated brake chopper and IP20 protection class.
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Product Description:
The 134U7728 Frequency Converter delivers 0.55 kW shaft output with IP20 protection. It supports efficient current handling, overload tolerance and stable supply performance. Its compact construction and reliable efficiency make it suitable for a wide range of automation and control applications.
The 134U7728 frequency converter is designed for operational stability with a supply frequency of 50 - 60 Hz and a ± 5 % tolerance. It features continuous current ratings of 1.7 A at 3 x 380 – 440 V and 1.6 A at 3 x 441 – 480 V. The cooling requirements demand a clearance of 100 mm on the top and bottom which ensures adequate airflow and prevents overheating. In overload conditions, the converter can sustain 2.7 A intermittently for up to 60 seconds that maintains performance under demanding loads. The model requires a control terminal cross sections up to 2.5 mm² for flexible or rigid wire while also supporting minimum sizes of 0.55 mm². The maximum imbalance between mains phases is limited to 3.0 % of rated voltage. The true power factor remains ≥ 0.9 at rated load that enhances energy efficiency.
The 134U7728 frequency converter also supports continuous apparent power handling of 1.2 kVA at 400 V AC and 1.3 kVA at 480 V AC. When operating the frequency converter with factory default settings, it is necessary to install a jumper wire between terminal 12 and terminal 27. A jumper may be connected between terminal 13 and terminal 27 if terminal 13 is configured as the digital input. This ensures controlled system start up and integration within automated control circuits. The STO input cable length can reach 20 meters unshielded for installation across varying layouts.
Frequently Asked Questions about 134U7728:
Q: How does the Danfoss 134U7728 frequency converter ensure safe startup in factory-default wiring configurations?
A: A jumper between terminal 12 or 13 and terminal 27 activates the internal 24 V signal. This bypasses the need for an external interlock device during basic commissioning.
Q: What impact does the cooling clearance design have on the 134U7728 frequency converter in confined installations?
A: The unit requires 100 mm of free space at both the top and bottom for airflow. This design prevents thermal buildup and supports reliable performance under rated load.
Q: How does the Danfoss 134U7728 converter maintain overload performance under short-duration peak demands?
A: It sustains intermittent current overloads for up to 60 seconds. This capability supports torque-heavy applications without compromising converter stability or efficiency.
Q: What wiring considerations apply when installing control terminals on the 134U7728 frequency converter?
A: It accepts flexible or rigid wires with cross sections up to 2.5 mm². This allows simple adaptation to varied panel wiring schemes and control layouts.
Q: How does the Danfoss 134U7728 drive handle installation in systems with phase imbalance and long cable runs?
A: It tolerates a mains phase imbalance of up to 3% of rated voltage. The STO input supports cable lengths up to 20 meters unshielded, offering layout flexibility.
