Ecu Danfoss Compressor Frigobox Truck

The Danfoss 101N0260 is an electronic control unit designed to drive Danfoss/Secop BD series compressors in mobile refrigeration applications. It integrates compressor motor (BLDC) management, power protections and basic diagnostics via a flashing LED.

Technical specifications

• Power supply: 24V DC
• Maximum allowed voltage (24V system): 31.5 V
• Maximum ambient temperature: 55 °C
• Integrated protection: thermal (shutdown for electronic unit overheating)
• Recommended system protection: 7.5 A fuse on the positive, as close to the battery as possible
• Main switch (if present): recommended rating min. 20 A
• Fan output: regulated 12V even on a 24V system (therefore use a 12V fan)
• Fan current: 0.5 A continuous (with an allowed short-start peak)

• Compressor speed selection via resistor (control circuit): 2000 rpm (resistor 0 Ω); 2500 rpm (approx. 277 Ω); 3000 rpm (approx. 692 Ω); 3500 rpm (approx. 1523 Ω)
• Battery protection (cut-out / cut-in) settings: Standard: cut-out 22.8V and cut-in 24.2V

DIPA can intervene to overhaul these components thanks to its experience and expertise.

Functions

• Control and drive of BD series compressor with speed management (fixed set via resistor)
• Management of thermostat ON/OFF (run permission) via dedicated terminals
• Management of battery protection (shutdown and restart based on voltage thresholds measured at the unit power terminals)
• Dedicated output for condenser fan (regulated 12V)
• Essential diagnostics via an optional external LED with blink codes for operational faults

Model applications

• Mobile refrigeration systems using Danfoss/Secop BD series compressors: truck refrigerators and drawers (cab/box); camper refrigeration systems; marine applications (boat refrigerators); portable refrigerated boxes and small 24V DC systems.

Common faults

• The compressor does not start or attempts to start and then stops
• The fuse blows continuously
• The control unit overheats

Associated diagnostic codes

Diagnostics are performed via LED blink codes (external LED connectable to the control unit):

• 1 blink: battery protection trip (voltage out of range)
• 2 blinks: fan overcurrent (excessive draw)
• 3 blinks: motor start error (rotor locked or differential pressure too high)
• 4 blinks: low-speed error (unable to maintain approx. 1850 rpm minimum)
• 5 blinks: thermal trip of the electronic unit (overheating)

Final conclusions

The Danfoss 101N0260 is a control unit for BD series compressors intended for 24V DC systems, with integrated battery protection, fan management, speed selection and LED diagnostics.

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