Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for BITMAIN APW12
Summary of Contents for BITMAIN APW12
- Page 1 APW12 120 Volt Unlock Guide Document Revision 3 2024-02-01...
-
Page 2: Table Of Contents
Overview............................3 Hashing from 120V AC........................ 4 Limiting Miner Power Draw......................4 Reducing Hash Voltage and Hash Frequency..............4 Remove Hash Boards......................4 APW12 120V Unlock Instructions....................6 Recommended Tools and Parts for Modification..............6 Modification Steps........................6 Step 1..........................6 Step 2..........................7 Step 3..........................8 Step 4..........................9... -
Page 3: Warnings And Disclaimers
Warnings and Disclaimers WARNING: HIGH VOLTAGE! HAZARD OF ELECTRICAL SHOCK: The power supply you are working on contains capacitors that store high levels of electrical energy that can be extremely dangerous or deadly even when disconnected from the power source. Extreme caution must be exercised when modifying the power supply. -
Page 4: Overview
The APW12 has 2 input power legs. Each input leg has its own brown out detector circuit that prevents the APW12 from fully powering on if the input voltage of either leg is below 200V AC. This ensures that the APW12 has enough input voltage to supply the fully specified output power. -
Page 5: Hashing From 120V Ac
Hashing from 120V AC Applying the modification steps in this guide to the APW12 PSU will enable it to power most Bitmain X19 and X21 mining rigs from 120V AC. Care must be taken to not overload the 120V AC circuit (circuit breaker, wiring, outlet, etc.). Be sure to consider the power requirements of the mining equipment as well as all other electrical equipment on the same circuit. - Page 6 single hash board will reduce the nominal power draw by a third. Removing two hash boards will reduce the nominal power draw by two-thirds. Removing one or more hash boards will allow the remaining hash board(s) to run at higher hash frequencies and increase hash rate without exceeding power limitations.
-
Page 7: Apw12 120V Unlock Instructions
The instructions in this section are for modifying the minimum required input voltage on the APW12 from 200V AC to 120V AC. Follow all safety precautions previously outlined and consider working in a well ventilated area with protective respiratory gear and a smoke absorber or fan running. -
Page 8: Step 2
Step 2 After the PSU has been unplugged and allowed sufficient time to discharge its high voltage capacitors (at least 10 minutes), remove the top PSU cover plate by removing the 6 chassis screws (circled in red below) with a phillips screwdriver and pulling up on the top cover plate. -
Page 9: Step 3
Step 3 Remove the 10 PCB mounting screws (circled in red below). Note that a few of the screws may be covered by the white, silicone conformal coating. Document Revision 3 2024-02-01... -
Page 10: Step 4
Step 4 In order to gain access to the back side of the PCB, partially remove the PCB from the PSU enclosure by gently lifting up on the center heat sink and PCB edges. Note that the 6 power cables coming from the 2 power input sockets do not need to be detached from the PCB. -
Page 11: Step 6
Step 6 Locate both brown out detectors’ high-side resistor networks. Note that there are 2 sets of three resistors in each network. The resistors are 0805 surface mount chip resistors with a small, white “2204” label printed on top of each resistor. Also note that the white silkscreen designators printed on the PCB next to each resistor may vary from PSU variant to PSU variant. - Page 12 Document Revision 3 2024-02-01...
-
Page 13: Step 7
Step 7 Use a sharp scraping tool to gently remove the conformal coating on top of and around the 4 pads shown below (2 pads per resistor network tinted red where the conformal coating should be removed). You will be soldering resistors to these pads. It is important to completely remove the conformal coating on top of and immediately around the pads. - Page 14 Failure to do so will lead to harmful, toxic fumes from the melted conformal coating being released during the soldering process. Be careful not to remove the PCB’s green solder mask around the resistor. It acts as an insulator shielding sensitive copper conductors below it.
- Page 15 Document Revision 3 2024-02-01...
-
Page 16: Step 8
Step 8 Prepare the resistors to be soldered to the PCB. Bend the resistor leads so that they span the distance between the cleaned pads and trim the resistor leads to remove any unneeded, excess length (see image below in Step 9). Step 9 Solder a 1 MΩ... -
Page 17: Step 10
Step 10 Prepare to reinstall the PCB back into the PSU enclosure by ensuring that the black plastic is properly aligned in the bottom of the PSU enclosure as shown in the image below. The PSU may be permanently damaged if the PCB comes in direct contact with the metal enclosure. -
Page 18: Step 11
Step 11 Remount the PCB to the PSU enclosure by sliding the PCB back into the enclosure, aligning the screw holes, and inserting the 10 mounting screws. Check to make sure that no part of the PSU is making direct contact with the metal enclosure. Document Revision 3 2024-02-01... -
Page 19: Step 12
Step 12 Reinstall the top PSU cover plate by aligning the top PSU cover plate’s six screw holes with the bottom enclosure’s six screw holes and installing the six screws. Do not overtighten the screws. Step 13 power on the PSU by plugging it into a Check your work.
Need help?
Do you have a question about the APW12 and is the answer not in the manual?
Questions and answers