Velleman LABORATORY POWER SUPPLY (0-30 VDC + 5 VDC + 12 VDC) WITH ANALOGUE DISPLAY PS603
Specifications:
input voltage: 230 Vac ± 10 %
output voltage: 0-30 Vdc / 12 Vdc / 5 Vdc
corrente de saída: 3 A / 1 A / 1 A
limited current: 10 mA – 3.2 A / 1.2-1.6 A / 1.2-1.6 A
ripple and noise:
constant voltage: max. 2 mV
constant current: max. 5 mA
voltage indicator deviation: max. 10 mV
current indicator deviation: max. 5 mA
fuse: F1.5AL 250 (order code FU1.5N: FUSÍVEL 5 x 20 mm LENTO 1,5 A (10 unids/caixa) )
working time: 8 hours uninterrupted without overload or short circuit
dimensões (Lg x Al x P): 150 x 145 x 300 mm
peso : 4.5 kg
protection: current limitation and short circuit protection
The used power supply I got had a problem with current readout and I needed to find the problem.
The basically same power supply is known as Velleman PS603 when it has analog meters and as PS613 when it has digital meters. The same power supplies are also sold with other brand names like Altai, Electrovision, Auto-Tech and Manson. Those power supplies seem to be imported from China and come with just basic English/Chinese instructions. It’s a simple case of “Badge Engineering”, in accordance to the importer/distributor’s requirements.
Power supply circuit details
Manson, Velleman, etc, PS 613 bench power supply repair – Schematics needed discussion at
https://www.eevblog.com/forum/repair/manson-velleman-etc-ps-613-bench-power-supply-repair-schematics-needed/ says:
In the same family of these re-labelled bench power supplies:
Manson EP-601, analog panel meters, 0-30VDC 2.5A
Manson EP-603, analog panel meters, 0-30VDC 2.5A, Aux 5V 12V 0.5A
Velleman PS-603, analog panel meters, 0-30VDC 3A, Aux 5V 12V 1A
Manson EP-611, LCD panel meters, 0-30VDC 2.5A
Manson EP-613, LCD panel meters, 0-30VDC 2.5A, Aux 5V 12V 0.5A
Velleman PS-613, LCD panel meters, 0-30VDC 3A, Aux 5V 12V 1A
Circuit Test PSA-2530D, LCD panel meters, 0-30VDC 2.5A, Aux 5V 12V 0.5A
Jaytech MP-3082, LCD panel meters, 0-30VDC 2.5A, Aux 5V 12V 0.5A
Manson EP-3050 ?, LCD panel meters, 0-30VDC 5A, Aux 5V 12V 1A
Dick Smith Q1760, analog panel meters, 0-30VDC 5A, Aux 5V 12V 1A
The 5A and 2.5A are the same design, just beefier pass-transistors. I also have schematics for the one’s with a fan.
Mastech HY-3010D, HY3005 is a bit different circuit design, also missing protection diodes and blows up just as easily.
Circuit diagram
https://www.eevblog.com/forum/repair/manson-velleman-etc-ps-613-bench-power-supply-repair-schematics-needed/?action=dlattach;attach=479027;image
https://www.eevblog.com/forum/repair/velleman-ps603-power-supply/ discussion says:
Same schematic PS603 (analog meters) or PS613 (digital panel meters).
They are not very strong or well made and need a lot of repairs.
LABORATORY POWER SUPPLY (0-30 VDC + 5 VDC + 12 VDC) WITH ANALOGUE DISPLAY
https://www.velleman.eu/products/view?id=13880
Specifications
input voltage: 230 Vac ± 10 %
output voltage: 0-30 Vdc / 12 Vdc / 5 Vdc
anto: 3 A / 1 A / 1 A
limited current: 10 mA – 3.2 A / 1.2-1.6 A / 1.2-1.6 A
ripple and noise:
constant voltage: max. 2 mV
constant current: max. 5 mA
voltage indicator deviation: max. 10 mV
current indicator deviation: max. 5 mA
fuse: F1.5AL 250 (order code FU1.5N: FUSE 5 x 20mm SLOW 1.5A (10pcs/box) )
working time: 8 hours uninterrupted without overload or short circuit
dimensions (W x H x D): 150 x 145 x 300 mm
paino: 4.5 kg
protection: current limitation and short circuit protection
Links to more information:
https://www.eevblog.com/forum/beginners/manson-ep-613-dc-power-supply-troubleshooting
Meter repair
The main problem with the power supply I had was that the analog meters seemed to be stuck so that they did not move well. I had to do some repair and cleaning. And after it I had to check after fixing that the meters worked correctly and accurately.
Here are some information on analogue meter repair that I found useful:
https://bbs.homeshopmachinist.net/forum/general/59343-ot-meter-repair discussion says:
9 times out of 10 a few good blasts of dry air will fix it fine.
Gently hold the needle and try to avoid blowing the spiral spring too hard.
I use one of those rubber squeeze bulbs and direct the air carefully.
Some people use small strips of scotch tape to remove particles from inside the works.
I was always to uncoordinated to do that.
If the meter has been dropped or bumped too hard or the needle has been slammed, the needle may be bent and rubbing.
Also, if it’s a plastic face it may have a static charge, use anti static fabric softener to clean.
If the Meter is really old the jewels may be broken or missing or if your lucky the pivot bearings are loose and need tightening.
There should be a very slight lateral movement ( like a couple thou at most ) at the pivot points.
Too Much play? Tighten them, but, Don’t, Do Not! Never Ever! over-tighten! I’ll tighten the screws about 20 degrees at a time.
As an end note, do not use oil.
Tuner cleaner would be my first choice, it cleans out any dried oil and gunk and leaves behind a very light, non conductive lubricant.
Cheers,
There is a little coil of wire on the “tail” of the needle, which is supposed to counterbalance the needle. If it does not, then when vertical, it will not be in balance, but when horizontal, it will be fine, the uncounterbalanced weight has no effect.
One major cause of what you mentioned is corrosion of the magnet faces. Whiskers of corrosion may get trapped in the works and cause random problems. Allowing the coil to move around, as when one bearing is loosened or removed, may crush the whiskers and free it up again. If the particles are not magnetic, they can fall free after being crushed.
Obviously any magnetic material will cause big problems.
It’s possible for sticky bearings to cause random needle stoppage, but, I think, less common than crud in the magnet/coil assembly..
When working on Old Radios, TV’s and such, I mostly need to use a 1000 “ohms per volt” Analog Meter.
Schematics contain Voltage data based on these type meters.
Today’s Digital meters often are several meg-ohms total load and will give a higher than normal reading because of the lighter load on the circuit under test.
This is especially critical when testing sensitive equipment.
In a pinch, a proper size series resister can be used with a DVM.
Links to more information on old meters repair:
https://www.rfcafe.com/references/qst/rejuvenating-old-meters-feb-1943-qst.htm
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