175U1940
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The Danfoss 175U1940 is part of the VLT Brake Resistors series and features a robust steel grid enclosure. It has a nominal power rating of 0.26 kW, a resistance value of 620 Ohms, and offers braking power of 1.0 kW at 40% ED. The resistor is IP20 rated, weighs 2.1 kg, and measures 120mm in height and 98mm in width.
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Product Description:
The Danfoss 175U1940 Brake Resistor is designed for both horizontal and vertical brake applications. It provides essential braking performance in various operating environments. Its specifications ensure reliable performance under diverse conditions.
The 175U1940 brake resistor operates within a wide ambient temperature range of – 40 °C to + 70 °C and can withstand transport and storage temperatures in the same range. It has a maximum housing temperature of 300 °C. For effective operation, the resistor is rated for a maximum relative humidity of 5 – 85 % that ensures non condensing conditions. The resistor’s power rating follows a derating curve where its continuous power is 100 % at 40°C and reduces to 70 % at 70 °C. The resistor’s cooling relies on free natural convection that means that proper installation with sufficient clearances is essential for efficient cooling. These power ratings are calculated based on the assumption of natural cooling without forced ventilation. For high altitude installations, the power derating changes as follows: 100 % at 1000 meters above sea level, 94 % at 1500 meters, and 82 % at 3000 meters. These adjustments help maintain performance at different altitudes where the air density is lower.
The 175U1940 Brake Resistor is designed with a nominal power rating of 0.26 kW and a resistance value of 620 ohms. Its braking power is rated at 40 % ED that is capable of handling cycles of 120 seconds at 1.0 kW. The product comes with protection class IP20 which provides minimal protection against dust ingress. The housing dimensions are 120 x 98 x 354 mm and it weighs 2.1 kg that makes it compact and suitable for various industrial applications.
Frequently Asked Questions about 175U1940:
Q: How does the Danfoss 175U1940 brake resistor handle braking efficiency during intermittent load cycles?
A: It supports 40% duty operation and can manage 1.0 kW for 120-second intervals. This makes it suitable for repetitive deceleration tasks in both horizontal and vertical motion systems.
Q: What cooling considerations are critical for reliable operation of the 175U1940 brake resistor in closed panels?
A: It uses natural convection for heat dissipation and requires proper installation clearance. Without forced ventilation, the derating curve becomes essential to avoid thermal overload.
Q: How does the 175U1940 brake resistor maintain stable performance across altitude variations in remote installations?
A: It retains full rated power at 1000 m but derates to 82% at 3000 m due to reduced air density. This adjustment ensures consistent braking capacity at high elevations.
Q: What ambient conditions does the Danfoss 175U1940 brake resistor support for rugged outdoor or unconditioned environments?
A: It operates reliably between –40 °C and +70 °C without condensation. These thermal tolerances support field applications with wide seasonal or operational temperature swings.
Q: How does the 175U1940 brake resistor offer compact integration without compromising safety or function?
A: Its IP20 housing limits dust ingress while keeping the unit lightweight at just 2.1 kg. The size and form factor support flexible placement in control cabinets or equipment frames.
