176F8685
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The Danfoss 176F8685, a component of the VLT PowerCards series, is designed with a power rating of 7.5 kW (10 HP) and operates at 3 x 380–480 V AC input. The unit features an efficiency of 0.98 and a continuous output current of 17.0 A. It has an IP20/Chassis enclosure rating and can handle ambient temperatures up to 50°C (122°F).
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Product Description:
The 176F8685 Power Card is a critical interface for VLT/FC series drives. It features built in SMPS, fan control, current feedback and essential protections for high performance industrial motor drive applications.
The 176F8685 power card from Danfoss operates at 400 kW and is compatible with three phase 690 V input. This unit is conformally coated and built for Frame D4/D2 systems. It ensures reliable control and safe communication between control logic and power stage. The power card includes a switched mode power supply (SMPS) which generates multiple internal voltages — 24 V DC, ± 18 V DC, and 5 V DC — from the DC bus. These voltages power control logic, internal interface circuits and accessories. A soft charge circuit is integrated in this model that features approximately 68 Ω resistor, fuses, metal oxide varistors (MOVs) and positive temperature coefficient resistors (PTCs). The card also contains circuitry for cooling fan regulation. It supplies around 200 VAC for low speed operation and 230 VAC for high speed fan mode. The current sensors with Hall effect technology are used to feed back output currents. These current signals are buffered by the power card and sent to the control card. This supports functions like waveform compensation and overcurrent detection including protection against short circuits or earth faults.
The 176F8685 power card is mounted using seven T25 screws and interfaces via MK100, MK102, MK105 connectors. The total weight of the model is 1.10 kg and dimensions are 45 cm by 30 cm by 9 cm. No scaling card is included in this model. This design allows for accurate signal isolation and robust voltage interfacing under industrial load conditions. Its construction ensures stability and precision in drive operation while protecting components from electrical faults.
Frequently Asked Questions about 176F8685:
Q: What mechanical and connector layout considerations should be followed when installing the 176F8685 power card?
A: It mounts with seven T25 screws and connects via MK100, MK102, and MK105 interfaces. The layout supports secure placement and reliable signal transmission in D2/D4 frame assemblies.
Q: How does the 176F8685 power card support multi-voltage generation within VLT/FC drive systems?
A: It includes a switched-mode power supply that converts the DC bus into multiple control voltages. These regulated outputs power internal logic and accessory interfaces with high efficiency.
Q: What role does the soft charge circuit in the 176F8685 play during power-up events?
A: It integrates resistors, MOVs, fuses, and PTCs to control inrush current. This protects the internal circuitry and ensures safe capacitor charging during startup.
Q: How does the 176F8685 power card ensure reliable current feedback for control processing?
A: Hall effect sensors detect phase currents and route buffered signals to the control card. This allows precise current monitoring for waveform correction and fault detection.
Q: What fan speed regulation method does the 176F8685 use under dynamic thermal conditions?
A: The card outputs 200 VAC for low-speed and 230 VAC for high-speed fan operation. This automatic fan control ensures thermal balance under fluctuating load levels.
