178B4820
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The 178B4820 frequency converter features a compact enclosure design, IP20 enclosure class, three-phase compatibility, and a net weight of 61 kilograms. Part of the VLT 5000 Frequency Converters series by Danfoss, it supports Profibus DP fieldbus communication and includes a local control panel for convenient operation.
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Product Description:
The Danfoss 178B4820 Frequency Converter operates effectively across a wide supply frequency range and ensures high torque delivery at various operating conditions. The converter supports multiple input types, torque levels and switching parameters.
This 178B4820 frequency converter is designed to work within a supply frequency range of 48 to 62 Hz with a tolerance of ± 1 %. It includes a high maximum short circuit rating of 100,000 A which supports safe operation under fault conditions. The converter permits approximately one switching operation every two minutes on supply inputs L1, L2 and L3. It delivers starting torque of 180 % for a short burst of 0.5 seconds that is ideal for demanding motor starts. The acceleration torque is rated at 100 % and arresting torque at 0 rpm in closed loop operation is also 100 % that enables controlled stopping and holding. The analog control section of the model includes two programmable voltage/thermistor inputs located at terminals 53 and 54. These inputs accept voltage levels from 0 to ±10 V DC and offer a scalable interface with an input resistance of 10 kΩ. It features one programmable analog current input on terminal 60 that supports a scalable range of 4 to ± 20 mA. These capabilities allow flexible integration with various sensor and control devices for precise process management.
The external 24 Volt DC supply interface on this 178B4820 frequency converter is located at terminals 35 and 36. It supports a voltage range of 24 V DC ± 15 % with a temporary peak of up to 37 V DC for 10 seconds. The unit allows a maximum voltage ripple of 2 V DC and consumes between 15 W and 50 W of power with peak startup power reaching 50 W for 20 milliseconds.
Frequently Asked Questions about 178B4820:
Q: How does the Danfoss 178B4820 frequency converter manage torque control during abrupt motor starts and stops?
A: It delivers 180% starting torque for 0.5 seconds, ideal for initiating loads under static resistance. During stopping, it applies 100% torque at 0 rpm using closed-loop control.
Q: What integration flexibility does the 178B4820 frequency converter offer for analog process control systems?
A: It supports two programmable voltage or thermistor inputs and one scalable current input. These inputs enable precise signal interfacing with a wide range of sensors and control hardware.
Q: How does the Danfoss 178B4820 converter protect system integrity under short circuit or phase fault conditions?
A: It handles up to 100,000 A short circuit current, safeguarding critical components during faults. Input switching is limited to one operation every two minutes to avoid overstress.
Q: What behavior should be expected from the external DC supply interface on the 178B4820 frequency converter during transient voltage peaks?
A: It tolerates temporary surges up to 37 V DC for 10 seconds. The design accepts ripple voltage up to 2 V DC while ensuring continuous operation within safe limits.
Q: How does the analog signal input design of the Danfoss 178B4820 converter enhance field device compatibility?
A: Voltage inputs at terminals 53 and 54 accept ±10 V DC with 10 kΩ resistance, enabling broad controller support. Terminal 60 handles 4 to ±20 mA signals for scalable current-based feedback.
