131B7038
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The 131B7038 is a three-phase HVAC drive with a rated power of 5.5 kW and an IP55 protection rating. Manufactured by Danfoss, it belongs to the VLT FC 102 HVAC Drives series and features a graphical LCP type. The unit measures 420mm in height, 242mm in width, and 200mm in depth.
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Product Description:
The 131B7038 Frequency Converter from Danfoss provides efficient motor speed and torque control. It ensures high performance with a typical shaft output of 5.5 kW (7.5 HP). It supports continuous and intermittent operation. It offers protection ratings and communication options for flexible integration.
This 131B7038 frequency converter’s continuous output current is 13 A at 3 x 380 – 440 V and 11 A at 3 x 441 – 480 V. The intermittent output current reaches 14.3 A at 3 x 380 – 440 V and 12.1 A at 3 x 441 – 480 V. The continuous power output is 9.0 kVA (400 V AC) and 8.8 kVA (460 V AC). The converter is equipped with STO functionality on Terminal 37 which is an essential safety feature that ensures the motor is safely de energized. The STO functionality cuts off the power supply to the motor’s drive. The voltage input range for the STO is 0 – 24 V DC. The maximum voltage at the input is 28 V DC. The input capacitance of the STO is 400 nF. The analog output of this converter supports up to 500 Ω load to GND. The accuracy of the output is within 0.5 % of full scale with 12 bit resolution. The analog output is galvanically isolated from PELV and high voltage terminals.
The RS-485 serial communication is supported by the 131B7038 frequency converter via control terminals 68 (P, TX+, RX+), 69 (N, TX–, RX–) and terminal 61 as common. The speed control range of this model in open loop is 1:100 and 1:1000 in closed loop. The speed accuracy in open loop is ± 8 rpm over a range of 30 – 4000 rpm.
Frequently Asked Questions about 131B7038:
Q: How does the 131B7038 frequency converter enable precise analog signal output for external monitoring systems?
A: It offers an analog output with 12-bit resolution and 0.5% full-scale accuracy, suitable for feedback loops or analog-driven instrumentation. The output is galvanically isolated, ensuring stable signal performance under variable load.
Q: What level of speed regulation performance can be expected from the 131B7038 frequency converter in open and closed loop operation?
A: It provides a speed control ratio of 1:100 in open loop and 1:1000 in closed loop, covering a wide torque range. Speed accuracy in open loop is maintained within ±8 rpm, ensuring dependable regulation.
Q: How does the 131B7038 frequency converter support safe motor shutdown integration within functional safety circuits?
A: It includes a Safe Torque Off (STO) function on Terminal 37 that operates within a 0–24 V DC logic range. Input capacitance is 400 nF, and current draw remains low, simplifying integration with safety relays or PLCs.
Q: What type of fieldbus or communication setup is supported on the 131B7038 frequency converter for serial data exchange?
A: It enables RS-485 communication via dedicated terminals for TX+/TX– and common reference. This allows multi-device networking for centralized control in distributed automation systems.
Q: How does the 131B7038 frequency converter maintain performance across variable voltage conditions in industrial power grids?
A: It delivers different current ratings for 380–440 V and 441–480 V supply bands, optimizing load response based on input voltage. This provides steady output whether used in low or high-line environments.
