Danotherm Electric A/S

Danotherm Electric A/S

Naesbyvej 20, 2610 Roedovre, Denmark

Bi-Alpha

Bi-Alpha

The Bi-Alpha compact power resistors

Danotherm has developed flat power resistors for moderate power brake applications in drive systems, braking a few hundreds of watts to few kilowatts during a short time of braking.

The Bi-alpha is available in 3 sizes; Bi-Alpha 4, 5 and 6. Their nominal power is rated at 45W for size 4, 100W for size 5 and 175W for size 6. These values are valid for forced air cooling of 2m/s. By increasing the airspeed the nominal power can be increased.

Because of its low profile height they can easily be mounted at the back side of an VFC (Voltage Frequency Converter).  

The Bi-Alpha is a simple construction where the resistor wire is wounded on a mica substrate and insulated by mica sheets on both sides. This element is enclosed in a metal alloy housing made from aluminium and zinc. The Bi-Alpha resistors are a cost efective solution for small to medium power drive systems.

Connection leads are insulated with high temperature silicon, rated at 250°C. IP value for each size is IP50.

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SPECIFICATIONS
Power Range 45W - 175W
Pulse Load 40s/120s:. . . . . . . . . . . . . . . . . . . . . . 75W - 460W 10s/120s:. . . . . . . . . . . . . . . . . . . . . .140W - 760W 5s/120s: . . . . . . . . . . . . . . . . . . . . . 500W - 2.5kW 1s/120s: . . . . . . . . . . . . . . . . . . . . . 950W - 4.6kW
De-rating Linear: 40°C=Pn - 70°C=0.65*Pn
Environmental -40°C - + 90°C
Resistance Tolerance ± 10% (opt. ± 5%)
Dielectric Strength 2500VAC 50 Hz @ 1 minute
Working Voltage 600VAC; 850VDC
Insulation Resistance > 20MR
Protection class IP50
Max surface temperature 250°C
Cooling media forced air / heatsink
Connection cable AWG 18

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