300W Power Supply - 80 PLUS Certified Active PFC View full size

300W Power Supply - 80 PLUS Certified Active PFC

This is an 80 PLUS Certified Active-PFC PC power supply (PSU) chosen for RepRaps.  This 300W PSU has 30A of current on 12v; plus SCP, OCP, and OVP protection for your RepRap.  Comes with fiberglass insulated tubing for wiring rated to 1200C to help organize the mess of PC connectors.  3-year manufacturer warranty.  ROHS compliant.

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TWE-PSU30A-1A

$65.00

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This PC power supply is small (85mm x 175mm x 70mm), quiet, and efficient.  We can't recommend to follow advice heard in some chatrooms about 450W PSUs on eBay for $30 - we've tried that.  Read below and decide for yourself.

NOTE:  the Terawatt ATX-PSU Adapter (pictured) not included with this item, and is sold seperately, and is included in our Pro Power Kit.

This PSU is rated at 300W but the 2x 12v outputs are 14A and 16A respectively.  A RepRap typically runs on 20-25A @ 12v, so the 30A total here is 20% more than you'll need.  If you don't believe come see our printers or catch them on YouTube and UStream!  We only use this PSU on our RepRap printers and it has logged thousands of hours of successful printing.

The PSU has a thermal-sensing fan and it's whisper quiet.  This fan is quiet enough that we usually need to look in the cage to see if it's stopped or running.  We're also very impressed with how cool this PSU runs during printing.

The PSU has over-voltage protection (OVP), over-current protection (OCP), and short-circuit protection (SCP).  These features go a long way towards protecting your power supply and RepRap electronics.  For example, if there's a problem with your RAMPS or stepper motor calibration this PSU's OVP and OCP will activate if the problem is critical.

Likewise, in theory you should never have a short-circuit on your RepRap; but in pactice there are statistical chances for them to occur.  If one happens by accident the SCP circuitry on this PSU is designed and built to shutdown (quickly) and doesn't come back on until the short is fixed and the PSU has been reset.  Without SCP the power supply will behave unpredictably if there's a short-circuit, depending on brand, model, and make.  Perhaps it may suffer internal damage and yet appear externally to operate normally for a while.

The OCP shut-down behavior is temporary, so the PSU comes back on (quickly) once current is within tolerance.  On Repraps in-the-field a very-poorly adjusted stepper driver can cause this PSU's OCP to activate.  We've even seen it toggle during initial calibration prints before we have everything fine-tuned.  We've become accustomed to the OCP behavior and have learned to use it to identify normal operation or problems with electronics or motors.

FSU brand power supply with the following specifications:

GENERAL SPECIFICATIONS:

  
COOLING Fan(s):Single, 80mm sleeve bearing fan linked with Thermal Sensor
TOTAL OUTPUT POWER:300-WATT TOTAL CONTINUOUS OUTPUT @ 50°C
OUTPUT CONNECTORS:Main 24 Pin, P4 4-Pin, (2) Molex 4-Pin, (1) FDD 4-Pin,
 (2) Serial-ATA 15-Pin
NVIDIA SLI SUPPORTN/A
AMD/ATI CROSSFIRE SUPPORT:N/A
80PLUS CERTIFIED:YES
MODULAR CABLE:N/A
SAFETY APPROVAL:NEMKO, TUV, CSA, IEC, UL, CE
MBTF:100,000 HOURS @ TYPICAL
UNIT SIZE:85.0mm (W) X 175.0mm (D) X 70.0mm (H)
 3.35" (W) X 6.89" (D) X 2.76" (H)
UNIT WEIGHT:2.2 LB (S)
  

INPUT SPECIFICATIONS:

  
Input Voltage:115V AC to 230V AC, 47 ~ 63Hz
Power Factor Correction (PFC):ACTIVE PFC | FULL RANGE
Input Current:3.5A @ 115 Vrms, 60 Hz.
 2.0A @ 230 Vrms, 50 Hz.
Input Protection:Patented Input Fuse Protection
  

OUTPUT SPECIFICATIONS:

  
+12V RAILS:2
  
Output Voltage:+3.3V DC
 +5V DC
 +12V1 DC
 +12V2 DC
 -12V DC
 +5Vsb DC (Standby)
  
Output Current:20.0A @ +3.3V DC
 22.0A @ +5V DC
 14.0A @ +12V1 DC
 16.0A @ +12V2 DC
 0.5A @ -12V DC
 2.0A @ +5Vsb DC Standby
  
Output Protection:Complete OVP, OCP, SCP Protection
 OVP: OVER VOLTAGE PROTECTION
 OCP: OVER CURRENT PROTECTION
 SCP: SHORT-CIRCUIT PROTECTION

 

The OVP, OCP, and SCP on this PSU make a difference in the field.  The ATX Adapter Board we sell seperately has LEDs which serve as visual indicators to inform when features are active.

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