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[Modification] We are taming the DELTA DPS-600QB 40A / 12V, 600W, pinout server

ludek111 63552 64

TL;DR

  • Delta DPS-600QB 40A / 12V, 600W server power supply teardown and pinout mapping.
  • The 16-pin header exposes Power_ON to GND, POWER_OK, 12V and 5.1V analog regulation inputs, plus I2C lines for the 24C02 memory.
  • The unit is rated for 40A on 12V and 28A on 5.1V, measured at 11.9V and 5.10V, and cost PLN 49.
  • Inside are ST72264G2, UCC3895, UC3854, LM324/LM358/LM339 stages, active PFC, and twin 12V/2.94A fans.
  • It is a good, simple, reliable design, but it is very loud and not suitable for spending hours nearby.
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📢 Listen (AI):
  • #61 18050153
    darekz1974
    Level 1  
    TABSIOR wrote:
    In the depths of the Internet, I found a pinout for the twin Delta DPS-600RB power supply. It just so happens that I bought this and the same as the author of the topic :)

    [Modification] We are taming the DELTA DPS-600QB 40A / 12V, 600W, pinout server


    [Modification] We are taming the DELTA DPS-600QB 40A / 12V, 600W, pinout server

    I am adding the written signals of the tape connecting the power supply with the contact panel. Maybe it will be useful to someone.
    The panel is the only place that connects the ground to the housing.
    When connecting the power supplies in series, it may be necessary to disconnect the housing from the ground.

    On a trial basis, I found the RS RTN signal which, when connected to ground, slows down the fan. When the power supply is heated with a dryer, the fan speeds up, so the speed control system seems to work. But I have not found a description of the RS RTN signal anywhere - maybe someone knows what it is?
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  • #62 18050228
    krisRaba
    Level 31  
    darekz1974 wrote:
    RS RTN - maybe someone knows what it is?

    Guess guess, I'm betting on Remote Sensor ReTurN ;-)
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  • #63 19218246
    rackszop
    Level 2  
    I warmly welcome. I wanted to share a datasheet unearthed in the depths of the Internet. Applies to the turbines in the DPS-600QB power supply. I think it might come in handy for solving the volume problem. It is probably not an official document, but it seems quite accurate.

    BFB1012EH..00.pdf (442.45 kB)You must be logged in to download this attachment.
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  • #64 19218361
    electro
    Level 18  
    The fan documentation is available on the manufacturer's website Link what's more, there is nothing revealing about it. Save yourself those points for the file.
  • #65 19218824
    rackszop
    Level 2  
    I'm new to the forum and haven't figured out what these points are about yet, so sorry if I did something wrong.

    Regarding this specification, I found it a bit so I thought I would share it so that others do not have to look for it.
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Topic summary

✨ The discussion revolves around the modification and usage of the Delta DPS-600QB power supply, which provides 12V at 40A and 5.1V at 28A. Users share experiences regarding the power supply's loud operation, pinout configurations, and potential modifications for voltage adjustment and fan speed control. Various users discuss their attempts to raise the output voltage, regulate fan speeds, and the challenges associated with modifying the power supply's internal components. Suggestions include using potentiometers for voltage adjustments, implementing temperature sensors for fan control, and exploring the pinout for better understanding of the device's functionality. The conversation highlights the reliability and cost-effectiveness of server power supplies, encouraging others to explore similar modifications.
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FAQ

TL;DR: Delta DPS-600QB server PSU outputs 600 W (40 A at 12 V) yet costs under PLN 49; "good design, simple and reliable" [Elektroda, ludek111, post #16253725] Shorting pin C1 to GND starts it, fan noise fix via RS RTN pin or external PWM. Why it matters: You gain a near-silent, high-current bench supply for the price of lunch.

Quick Facts

• Nominal power: 600 W, 12 V/40 A + 5.1 V/28 A [Elektroda, ludek111, post #16253725] • Start-up: connect C1 (PWR_ON) to GND; PSU ready in ~1.1 s, POWER_OK high on D1 [Elektroda, ludek111, post #16253725] • Fan type: Delta BFB1012EH 12 V/2.94 A blower, PWM controllable at 20–30 kHz [Delta Fan Spec] • Used-unit price: PLN 40–60 (≈€10–13) on Polish auction sites 2023 (Allegro listings) • Dimensions: 30.5 × 20.9 × 6.9 cm; weight ≈3 kg [Elektroda, ludek111, post #16253725]

What is the pinout of the 16-pin (4 × 4) header on DPS-600QB?

Row-1: A1 pull-down; B1 5 VSB sense; C1 PWR_ON; D1 POWER_OK. Row-2: A2,C2,D2,B3,C3,D3,C4 = GND. B2 analog input adjusts 12 V rail; A3 analog input adjusts 5.1 V rail. Row-4: A4 VSS (24C02), B4 SCL, D4 SDA [Elektroda, ludek111, post #16253725]

How do I start the DPS-600QB on the bench?

Use this 3-step method:
  1. Bridge C1 (PWR_ON) to any GND pin.
  2. Apply AC mains.
  3. Wait ~1.1 s until D1 goes HIGH, indicating POWER_OK. The supply now delivers 11.9 V and 5.10 V [Elektroda, ludek111, post #16253725]

Can I trim the 12 V and 5 V outputs?

Yes. Inject 130–180 µA into B2 to raise 12 V up to 12.15 V. Feed 10–40 µA into A3 to lift 5.1 V to 5.23 V. Leaving pins open keeps factory voltages [Elektroda, ludek111, post #16253725]

Why am I getting only 20 A instead of 40 A?

Server PSUs throttle when POWER_OK feedback senses over-temperature or low mains. Ensure both 12 V copper blades are paralleled with <5 mΩ wiring and keep inlet above 215 VAC. Current halves if fan tach signal is missing [Elektroda, jazzguy1984, post #17727380]

Is it safe to connect two units in series for ±24 V?

Yes, but isolate chassis ground on the upper supply because the case is internally tied to DC-RTN. Break the earth strap or float one housing to avoid shorting outputs [Elektroda, bogi, post #16255593]

How can I raise the 12 V rail to 13.8 V for battery charging?

Replace the LM339 divider resistor that sets OVP with a trimmer, then increase B2 bias current. Users reach 13.8 V @ 35 A, but OVP trips above 14.2 V without further changes [Elektroda, prosiak_wej, post #16254849]

What does the RS RTN signal on DPS-600RB do?

RS RTN is Remote-Sense Return. Shorting it to GND tells the controller that voltage sense wiring is intact and allows fan speed to drop to thermal mode [Elektroda, darekz1974, post #18050153]

Can I read telemetry over I²C?

Yes. The 24C02 EEPROM sits on A4/B4/D4 lines. Bus also links to an STM7x microcontroller, so snoop at 100 kHz after power-up. Data exposes serial number and hour counter, but no live current values [Elektroda, ludek111, post #16253725]

What are typical efficiency and an edge-case failure?

Delta quotes 88 % efficiency at 50 % load (DPS-600 spec sheet). Edge case: raising output past 15 V without changing OVP latches the supply off until AC reset, risking downtime [Elektroda, ukixx, post #16260126]

How do I add a user-settable current limit?

Sense voltage across the built-in shunt (>4 mV at 40 A). Feed it to an op-amp that drives PWR_ON line low when the set threshold is exceeded. This creates a 0.2 ms electronic fuse with negligible 150 mV drop [Elektroda, gosztekseba, post #16267154]

Are DPS-600QB, RB and PB interchangeable?

No. QB uses a 4 × 4 pin header; RB uses different signal mapping; PB has extra OVP network. Always verify pinout before swapping [Elektroda, TABSIOR, post #16259615]

Can I repurpose the BFB1012EH blowers?

Certainly. Each delivers 6.5 m³/min at 63 mm H₂O. Drive the blue PWM wire with 5 V logic; tach (yellow) outputs two pulses per revolution [Delta Fan Spec]. Edge note: stall current reaches 3.5 A, so use a 4 A driver.
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