• Lkb Bromma 2197 Power Supply Manual

LKB BROMMA 2197 POWER SUPPLY. Unit powers up and works great. This item was removed from a working environment. Please feel free to ask question(s) if you have any. Download LKB BROMMA 2197 10-2,5KV,1-25,250MA ELECTROFOCUSING CONSTANT POWER SUPPLY 1985 USR. SM service manual & repair info for electronics experts.

LKB/Bromma electrophoresis supplies, at least all I have come across, have optical sensors inside that go across all the output connectors. LKB connector wires have a long plastic end that blocks the optical sensor and triggers the output on when the cables are fully plugged in. On mine, I went in and bypassed all the sensors by covering them with heat shrink tubing. These supplies work well, but be very careful with them. I found an operating manual for my 2197, but service data for LKB equipment is very scarce. The company that bought LKB out did not retain nor make any legacy equipment service data available.Mark- My Current Projects.

I only have one electrophoresis power supply, but it has another safety feature to be aware of. It is a LKB-ECPS3000-150. That is 3KV and 150 Watts. 'Leakage' can shut down the output, on mine there is a red led that goes on when the ps is cut-off due to leakage.

In this case, leakage is 'ground fault current' detected as the difference between the current out the positive terminal vs. The current in at the negative terminal. The power supply has an internal center-tap tied to ground. The intended electrophoresis cell loads are expected to be floating from ground. I can't blame them for having all these safety features; considering they are for use on 'wet bar' biology lab benches. Ex: Same job, same building, same phone #; 4 Corp's: RCA, GE, Martin, Lockheed-Martin: 48 years. I figured out what the problem is!

There is an interlock connector on the rear panel. It has a red and black wire. I measured 1 Vdc on the red and the black is grounded. I shorted the red to black with a 220 ohm resistor, but nothing happened. I shorted my meter probe across them and got some output. Then I used a piece of 18 gauge solid copper wire to short it and the thing started to work just fine. Apparently there was a safety lock of sorts that had to be plugged into it.

I get voltage at the terminals with or without a load. I emailed the Biochrom company, but they didn't have any info. This is a switching type of supply and it works at about 45 kHz. There is also some substantial 60 Hz hum to it. I may have to rig up a filter for it.

Any suggestions? There is also a wattage setting. You can set it for a particular wattage and it will not go over it, no matter the combination of resistance and voltage. David D. Poston, Mad Scientist Montgomery, Louisiana. I figured out what the problem is! There is an interlock connector on the rear panel.

It has a red and black wire. I measured 1 Vdc on the red and the black is grounded. I shorted the red to black with a 220 ohm resistor, but nothing happened.

I shorted my meter probe across them and got some output. Then I used a piece of 18 gauge solid copper wire to short it and the thing started to work just fine. Apparently there was a safety lock of sorts that had to be plugged into it.

Lkb Bromma 2197 Power Supply Manual

I get voltage at the terminals with or without a load.Sounds like a simple external-relay on/off control. The 2197 has the interlock on the back also, it is just a plastic encased 'key.' Be thankful your older model didn't have the optical sensors also. The only way to adapt these supplies for other purposes is to bypass these items.

The 2197 is a switching supply also, but the primary end of it is a hefty current 50 volt linear supply that is well filtered. I checked it, and there is no noticeable ripple in the output on this model. I don't imagine for the original purpose they had to be well filtered, so some makes/models might need some additional output filtering to make them useful as bench supplies.Mark- My Current Projects. The 2197 has the interlock on the back also, it is just a plastic encased 'key.'

Be thankful your older model didn't have the optical sensors also. The only way to adapt these supplies for other purposes is to bypass these items. The 2197 is a switching supply also, but the primary end of it is a hefty current 50 volt linear supply that is well filtered. I checked it, and there is no noticeable ripple in the output on this model. I don't imagine for the original purpose they had to be well filtered, so some makes/models might need some additional output filtering to make them useful as bench supplies.Mark- I have been experimenting with tuned chokes and they seem to work very well.

It is basically a tank circuit that resonates at the ripple frequency connected in series with the output. I am thinking of rigging one up and connecting it to my output and see how it works.

David D. Poston, Mad Scientist Montgomery, Louisiana. Have several electrophoresis supplies. They all work just like any other supply. Full output regardless of load.

This is not to say that the above descriptions are wrong, only that they're not universally applicable. Leigh Definitely true for the older power supplies. If you're going to buy one for your lab bench go for a older model.

Where I work we have hundreds of gel power supplies and our benches are frequently wet. All of the new power supplies that we have are loaded with safety features. It's been years since I've seen one without safety features.

Where I work Bio-rad are the most common power supplies.

LKB/Bromma electrophoresis supplies, at least all I have come across, have optical sensors inside that go across all the output connectors. LKB connector wires have a long plastic end that blocks the optical sensor and triggers the output on when the cables are fully plugged in. On mine, I went in and bypassed all the sensors by covering them with heat shrink tubing. These supplies work well, but be very careful with them. I found an operating manual for my 2197, but service data for LKB equipment is very scarce. The company that bought LKB out did not retain nor make any legacy equipment service data available.Mark- My Current Projects. I only have one electrophoresis power supply, but it has another safety feature to be aware of.

It is a LKB-ECPS3000-150. That is 3KV and 150 Watts.

'Leakage' can shut down the output, on mine there is a red led that goes on when the ps is cut-off due to leakage. In this case, leakage is 'ground fault current' detected as the difference between the current out the positive terminal vs. The current in at the negative terminal. The power supply has an internal center-tap tied to ground. The intended electrophoresis cell loads are expected to be floating from ground.

I can't blame them for having all these safety features; considering they are for use on 'wet bar' biology lab benches. Ex: Same job, same building, same phone #; 4 Corp's: RCA, GE, Martin, Lockheed-Martin: 48 years. I figured out what the problem is! There is an interlock connector on the rear panel. It has a red and black wire.

I measured 1 Vdc on the red and the black is grounded. I shorted the red to black with a 220 ohm resistor, but nothing happened. I shorted my meter probe across them and got some output. Then I used a piece of 18 gauge solid copper wire to short it and the thing started to work just fine. Apparently there was a safety lock of sorts that had to be plugged into it.

I get voltage at the terminals with or without a load. I emailed the Biochrom company, but they didn't have any info. This is a switching type of supply and it works at about 45 kHz. There is also some substantial 60 Hz hum to it.

I may have to rig up a filter for it. Any suggestions? There is also a wattage setting.

You can set it for a particular wattage and it will not go over it, no matter the combination of resistance and voltage. David D.

Poston, Mad Scientist Montgomery, Louisiana. I figured out what the problem is!

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There is an interlock connector on the rear panel. It has a red and black wire. I measured 1 Vdc on the red and the black is grounded. I shorted the red to black with a 220 ohm resistor, but nothing happened. I shorted my meter probe across them and got some output. Then I used a piece of 18 gauge solid copper wire to short it and the thing started to work just fine. Apparently there was a safety lock of sorts that had to be plugged into it.

I get voltage at the terminals with or without a load.Sounds like a simple external-relay on/off control. The 2197 has the interlock on the back also, it is just a plastic encased 'key.' Be thankful your older model didn't have the optical sensors also. The only way to adapt these supplies for other purposes is to bypass these items. The 2197 is a switching supply also, but the primary end of it is a hefty current 50 volt linear supply that is well filtered. I checked it, and there is no noticeable ripple in the output on this model.

I don't imagine for the original purpose they had to be well filtered, so some makes/models might need some additional output filtering to make them useful as bench supplies.Mark- My Current Projects. The 2197 has the interlock on the back also, it is just a plastic encased 'key.' Be thankful your older model didn't have the optical sensors also. The only way to adapt these supplies for other purposes is to bypass these items. The 2197 is a switching supply also, but the primary end of it is a hefty current 50 volt linear supply that is well filtered.

I checked it, and there is no noticeable ripple in the output on this model. I don't imagine for the original purpose they had to be well filtered, so some makes/models might need some additional output filtering to make them useful as bench supplies.Mark- I have been experimenting with tuned chokes and they seem to work very well. It is basically a tank circuit that resonates at the ripple frequency connected in series with the output.

I am thinking of rigging one up and connecting it to my output and see how it works. David D. Poston, Mad Scientist Montgomery, Louisiana. Have several electrophoresis supplies. They all work just like any other supply. Full output regardless of load. This is not to say that the above descriptions are wrong, only that they're not universally applicable.

Leigh Definitely true for the older power supplies. If you're going to buy one for your lab bench go for a older model.

Where I work we have hundreds of gel power supplies and our benches are frequently wet. All of the new power supplies that we have are loaded with safety features. It's been years since I've seen one without safety features.

Where I work Bio-rad are the most common power supplies.