Looking for docs => Rohde&Schwarz NGRE 40/30 Power Supply DC 0-40V 0-30A

[9aplus]

Looking for schematic or any kind of documentation for PS

Rohde&Schwarz NGRE 40/30 Power Supply DC 0-40V 0-30A 1200W

[9aplus]

 no one ?!

 

[Kleinstein]

They typically don't publish schematics for the newer products (e.g. past about 1990). So probably no luck there. If you are lucky you may get some more module / software oriented (e.g. to do recalibration) service manual, but even this is not always available.

[tonyalbus]

Did you find it ? ,
i am also looking for it, even a normal user manual i do not find.

[9aplus]

No.
No luck so far regarding schematic or manuals.
On the other hand heave two units here, one sort of working, can at last compare the results.

[tonyalbus]

Hi,

Found one on ebay, bought it, scanned it.
the NL(Dutch) version is the Latest DA version, Digital readout
the DL(German) is i think first version with Analog dials

feel free to share or upload to the known manual websites.

edit:
The german version is to lanrge to upload. send me a DM with your emailadres, i WeTransfer it to you

[9aplus]

@tonyalbus
Thank You!
Very kind of you 

PM sent

[pdenisowski]

No luck so far regarding schematic or manuals.

The user manual is not available on our internal website either, but it looks like @tonyalbus has come to the rescue 

[9aplus]

Just like to report that have both (two) units now up and running.
One as is, the second with calibration, cooling vent and two small bulbs replacement, only.
Still testing but so far so good.
Appreciate all assistance 

The only problem now, is how to make them bit more portable, heavy beasts must admit 

[9aplus]

Update...
The signal lamps/bulbs on NGRE unit are on 48 V AC, replacement is difficult to find, last time saw that kind
of indicators on old large scale crossbar telephone switching units, guess 45 years ago
On the second unit 2 of total 4 indicators are with broken glass.
Perhaps "hard landing" during the times before the units reach me.
It was possible to do "the surgery" on old indicators and now the 5K6 SMD R and white LED are doing the job.
The 50 Hz can be noted, but guess half duty cycle is benefit here

The cooling vents need some fresh oil in any case, now on both units all 3 vents are starting smooth and run
about the same time after the switch off. Recommended to all owners of similar units to open and check the
cooling, you may hear the vents running, but that can be only one of three.

Can put some internal pictures, in case someone is interested.

[coromonadalix]

pls do ...

[9aplus]

Here....

[coromonadalix]

ooooooh k   they put supplies in parallels   you have 3 identicals sections,  sums them up on page 17 ....   

it must weight  around 80 pounds or more loll 

thks

[9aplus]

More than 80 pounds

BTW This must be one of rare unique combination of
-el tubes (see that regulator on the last picture),
semiconductors like power transistors
and
chips with LCD for Volt and Amp meters 

[coromonadalix]

i would say to increase the led resistor a bit,  the led seem very bright ...  or 2 resistors  instead of one, to halve the dissipated power

and since it's on 50 or 60hz   the led will polarize itself  ....  since  you run at half sine, 25 hz should not be perceived by the eye ?? or slightly  ?

not so portable  loll

 

[9aplus]

The brightness of LEDs is about the same, like the near bulbs.
Around 8 mA AC going through. So far no burnout, let's see

Considering to add some wheels on the short open plywood vertical box,
sized to tight fit the PS box from behind.
That also may make the cooling stream noise bit lower.

[9aplus]

UPDATE II

It seems that my units are custom made.
Both going up to 50 V DC (under load) instead of 40 V DC as written on front.

One unit is responding well on the load in regards of noise and cooling speed. The second
is going almost full speed from the turn ON.
Must find that PTC/NTC whatever is somewhere in regulation chain.