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  1. To avoid risk of electric shock, turn off AC power before. installing or servicing PS902 power supply. 120/240 VAC, 1.1 A, 50/60Hz, High Voltage Class 1 Wiring Required. 2 Amp DC @ 12/24 VDC. 14" H x 12" W x 4" D (8 knockouts, 1/2" or 3/4" ) 32°-120° F (0°- 49° C) F1, T3.15A. 250VAC.

  2. 300ms • Maximum load cannot exceed power supply ratings or 6A for outputs combined Board Input Power Board requires 0.18A max. of power supply output current to operate Temperature Range 32°-120°F (0°- 49° C) Compliance UL 294, ULC-S318, RoHS, & FCC Part 15 Fire Alarm Input Accepts 900-FA Fire Alarm Board (Optional)

  3. 900-4R. 900-4R Specifications. Inputs I1-I4. Dry contacts required (Closed = Active) Connect control contacts between SC (Signal Common) and any input. Outputs O1-O4. Form C contacts rated 30VDC, 3A (dry) • 12/24VDC, 3A (wet) when AC powered • 9.6-13.2VDC or 19.2-26.4VDC when battery powered • Maximum load cannot exceed power supply ...

  4. The computer power supplies as well as commercial units normally have to ride through at least one cycle of input sine wave, which is 16 ms in U.S. and 20 ms in Europe. The PFC boost provides DC-link voltage (Vdc) which is higher than the peak of input AC. In modern computer PSU, this voltage is typically 375-400 VDC.

  5. PS902 Power Supply Specifications: Input 120/240 VAC, 1.1 A, 50/60Hz, High Voltage Class 1 Wiring Required Output 2 Amp DC @ 12/24 VDC Enclosure 14” H x 12” W x 4” D (8 knockouts, 1/2” or 3/4” ) Temperature Range 32°-120° F (0°- 49° C) Fuse F1, T3.15A 250VAC Compliance UL 294, ULC-S318, RoHS, & FCC Part 15, Class 2 Output

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  6. If you want a greater depth of information, see Step 6. Table of Contents. "Introduction" ~ <-- You are here. "Step 1" ~ Some background information and suggestions for projects. "Step 2" ~ A list of standard wire-colors and functions in an ATX PSU. "Step 3" ~ A chart of wire-associations on ATX connectors.

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  8. • Maximum load cannot exceed power supply ratings or 3A for outputs combined Board Input Power Board requires 0.1A max. of power supply output current to operate Temperature Range 32°-120° F (0°- 49° C) Compliance UL 294, ULC-S318, RoHS, & FCC Part 15 Fire Alarm Input Accepts 900-FA Fire Alarm Board (Optional) 900-2RS Specifications:

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