Difference between revisions of "H777 Power Supply"

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The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5, +15 and -15V, with optional +20V/-5V for use with [[core memory]].
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The '''H777 Power Supply''' is the [[power supply]] unit for the [[BA11-L mounting box]] from [[Digital Equipment Corporation|DEC]]. It provided [[direct current|DC]] [[current]] at [[voltage]]s of +5V, +15V and -15V, with optional +20V/-5V for use with [[core memory]]. A later variant (used for the [[PDP-11/24]] in the BA11-L box) also provided +15V/-15V for use by its [[EIA RS-232 serial line interface|RS232]] [[asynchronous serial line]]s.
  
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There are a large number of different versions, but they boil down to a combination of three (later four) options:
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An optional '''H775A Battery Backup Unit''' allowed provision of power to [[Metal Oxide Semiconductor|MOS]] [[main memory]] units mounted in the BA11-L, allowing their contents to be retained during brief power outages.
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A combination of up to 3 modules, composed of [[printed circuit board|boards]] with integral [[heat sink]]s, provided different combinations of output voltages:
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* +5V Regulator - [[DEC part number]] 70-11073 or 70-12909 (all configurations had to include one of these)
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* MOS Regulator, +/- 15V, +5VB - 54-11601
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* Core Regulator, +20V, -5V - 54-11599
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There are a large number of different models of the H777, but they boil down to a combination of three (later four) options:
  
 
* 110V or 220V [[alternating current|AC]] input
 
* 110V or 220V [[alternating current|AC]] input
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* The optional +20V/-5V supply
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* The optional +20V/-5V core supply
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* An upgraded +5V power supply (7012909) which produced 32 [[ampere|amps]] instead of the 25A of the original (7011073)
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* An upgraded +5V power supply (70-12909) which produced 32 [[ampere|amps]] instead of the 25A of the original (70-11073)
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The fourth option is the 'communication regulator', 54-13764, which provides +15V/-15V.
  
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The fourth option (used in the [[PDP-11/24]] in the BA11-L box) provided +12V/-12V for use by its [[MS11-M MOS memory]] instead of the +15V/-15V.
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The models are:
  
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It does not use a [[power harness]]; rather, it has a 'power distribution board' which holds the usual [[DEC power distribution connectors]]; the [[backplane]](s) mounted in the BA11-L plug in there.
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{| class="wikitable"
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! Model !! Input !! Regulators
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|-
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| -AA || 115 || 25A +5V, MOS and core
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|-
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| -AB || 230 || 25A +5V, MOS and core
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|-
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| -BA || 115 || 25A +5V, MOS only
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|-
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| -BB || 230 || 25A +5V, MOS only
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|-
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| -CA || 115 || 32A +5V, MOS and core
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|-
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| -CB || 230 || 32A +5V, MOS and core
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|-
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| -DA || 115 || 32A +5V, MOS only
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|-
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| -DB || 230 || 32A +5V, MOS only
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|-
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| -UA || 115 || 32A +5V, MOS, communication
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|-
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| -UB || 230 || 32A +5V, MOS, communication
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|}
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 +
The H777 does not use a [[power harness]]; rather, it has a 'power distribution board' built into one end panel, which holds the usual [[DEC power distribution connectors]]; the [[backplane]](s) mounted in the BA11-L plug in there.
  
 
The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).
 
The power distribution board also holds a connector for the usual DEC [[Remote Switching Control Bus]]; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).
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It was mounted longitudinally, at one side of mounting box, and included its own cooling fan.
 
It was mounted longitudinally, at one side of mounting box, and included its own cooling fan.
  
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[[Category: DEC Hardware]]
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==External links==
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* [http://bitsavers.org/pdf/dec/unibus/EK-BA11L-TM-001_Oct77.pdf BA11-L mounting box technical manual] (EK-BA11L-TM-001) - the H777 is covered on pp. 14-19 and Chapter 3, pp. 36-80
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* [http://www.bitsavers.org/pdf/dec/pdp11/1124/EK-11024-TM-001_PDP11_24_System_Technical_Manual_Jun81.pdf PDP-11/24 System Technical Manual] - covers the communication regulator in Appendix A
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* [http://bitsavers.org/pdf/dec/pdp11/1104/MP00019_1104_EngrDrws_Feb78.pdf 11/04 Engineering Drawings] - H777-0 Vol. 1 Field Maintenance Print Set (MP00016) is on pp. 104-142
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* [http://www.bitsavers.org/pdf/dec/pdp11/1124/MP01018_Rev_F_11-24_Engineering_Drawings_Mar84.pdf 11/24 Field Maintenance Print Set] - H777-0 Vol. 2 Field Maintenance Print Set (MP00309) is on pp. 169-194
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[[Category: DEC Power Supplies]]

Latest revision as of 15:41, 10 July 2023

The H777 Power Supply is the power supply unit for the BA11-L mounting box from DEC. It provided DC current at voltages of +5V, +15V and -15V, with optional +20V/-5V for use with core memory. A later variant (used for the PDP-11/24 in the BA11-L box) also provided +15V/-15V for use by its RS232 asynchronous serial lines.

An optional H775A Battery Backup Unit allowed provision of power to MOS main memory units mounted in the BA11-L, allowing their contents to be retained during brief power outages.

A combination of up to 3 modules, composed of boards with integral heat sinks, provided different combinations of output voltages:

  • +5V Regulator - DEC part number 70-11073 or 70-12909 (all configurations had to include one of these)
  • MOS Regulator, +/- 15V, +5VB - 54-11601
  • Core Regulator, +20V, -5V - 54-11599

There are a large number of different models of the H777, but they boil down to a combination of three (later four) options:

  • 110V or 220V AC input
  • The optional +20V/-5V core supply
  • An upgraded +5V power supply (70-12909) which produced 32 amps instead of the 25A of the original (70-11073)

The fourth option is the 'communication regulator', 54-13764, which provides +15V/-15V.

The models are:

Model Input Regulators
-AA 115 25A +5V, MOS and core
-AB 230 25A +5V, MOS and core
-BA 115 25A +5V, MOS only
-BB 230 25A +5V, MOS only
-CA 115 32A +5V, MOS and core
-CB 230 32A +5V, MOS and core
-DA 115 32A +5V, MOS only
-DB 230 32A +5V, MOS only
-UA 115 32A +5V, MOS, communication
-UB 230 32A +5V, MOS, communication

The H777 does not use a power harness; rather, it has a 'power distribution board' built into one end panel, which holds the usual DEC power distribution connectors; the backplane(s) mounted in the BA11-L plug in there.

The power distribution board also holds a connector for the usual DEC Remote Switching Control Bus; this could be used either as an output (on boxes which contained a front panel) or an input (for boxes used as expansion boxes).

It was mounted longitudinally, at one side of mounting box, and included its own cooling fan.

External links

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