DANFOSS REFRIGERATOR

PLEIAS

PLEIAS

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Hallo everybody.Recently after rewiring the boat's electrics (nightmare) i swiched the refrigerator on but all i got was a beep from the electronic unit (i didn't even know it beeped) as it was starting the fan but nothing from the compressor.The electronic unit is a 102N3030 with a BD3F DC compressor 12V.All cables were replaced with 2.5mm marine cable and the path is service battery to switch panel (new) to refrigerator electronic unit as was before and the voltage measured going in the unit is 13.2V.Any ideas about what can be done?Thanks in advance.
 
The fact that the fan works suggests you got your power wiring right. If the compressor does not warm up within a short while, it is likely the refrigeration circuit is faulty.

Possibly the compressor has a fault (not so likely) or the unit has degassed itself. Regassing can be undertaken by Danfoss (that's what I did) or another convenient agent. The piping and heat exchanger unit has to be removed and regassed; when refitting, the act of coupling the pipewaork releases the gas - bingo.

PWG
 
Did you measure the voltage while the cable was still plugged into the unit and the unit was turned on?

If not, do so - you may get a lower reading which indicates a poor connection somewhere in your wiring.
Don't start disconnecting the gas pipes until you are sure that all electrics are fine because then you will almost definitely need to send it off to be regasses
 
Danfoss report codes
five flashes Thermal cut out
four min motor speed
three motor start error
two fan over current
one battery protection cut out
 
From personal experience with the same equipment and same fault, this has NOTHING to do with gassing etc. as compressor would run but not do anything.
Though you are reading 13.2v at battery or switch, what at the terminals on the fridge when you switch it on. The battery may not be charged enough to supply the start-up current that this compressor needs. Did you have the engine running and charging the battery when you tried?

Did you move the fridge whilst re-wiring and if so where did you store it? Ours got over warm once and it was three days before it would start working again.

As in previous posting, is the polarity correct?

We had a couple of these fridges and never really happy with the electronics; had it confirmed by the manufacturers that the compressor was originally built for 240v mains use and the box of electronics "fooled" the compressor into thinking the supply was still 240V ac. The start up current surge is quite high, so check all connections for tightness, and that battery is charged. Your cable size of 2.5mm is OK.
 
To clarify Morse's post. Assuming that one beep on your model means the same as one flash on his, then it is telling you that it is not running because the voltage it is receiving is too low. (it thinks the battery is running low so it is trying to protect it from being completely flattened)

I had the same problem where the terminals at the unit measured 13v so assumed it was a problem with the unit but when I turned it on, the voltage dropped heavily. I was able to trace this low voltage back up my wiring until I found a partially damaged wire.
 
I found the following after hours of Googling.I'm posting only for future Searches as i gave up and called the technitian.Thanks everybody for your help as always it is outstanding.
Troubleshooting Compressors

--------------------------------------------------------------------------------

TROUBLESHOOTING REFRIGERATION COMPRESSORS
(Older Adler-Barbour, Grunert, Sea Frost, Technautics, etc.):

Newer Danfoss compressors BD3.5 and BD5.0 have a built in troubleshooting computer chip to make it much easier to find and solve problems.

Older Danfoss Compressors # BD 2, BD 2.5, and BD 3
Ninety percent of the time it is not the compressor, or refrigerant system that causes the failure of the compressor to start. The Danfoss electrical modules are prone to failure.
If you have bypassed the thermostat at the module, and run the following tests, I would have the module tested. They no longer manufacture modules for the BD2.5 or BD3 compressor but they are available from Frigoboat http://www.frigoboat.com/home.html
PN E254412 - Price: $198.00 http://www.frigoboat.com/Merchant2/m...de=otheraccess

Note: See the Frigoboat web-site (above) for some excellent refrigeration tutorials.

Repeated failure of start, and an audible cycle beep is caused by a program in the electronic module unit. It is programmed to stop the compressor if;

1. Low Voltage (<11.5VDC)
If the voltage is below 11.5 volts during start. Check batteries for charge. Check for a high-resistance connection. The best and quickest way to do this is run a temporary set of wires from a fully charged battery to the compressor electrical module. The wire size and polarity is important.

2. HIGH FAN/PUMP CURRENT (> 1 Amp)
If the fan or if water-cooled, the pump relay, is drawing more than one amp. To check, disconnect one of the wires to fan. If the compressor starts OK replace fan or pump or relay.

3. HIGH COMPRESSOR CURRENT (> 7.5 Amps)
If the compressor is going bad and drawing more than 7 1/2 amps. To check, install an ammeter in the power wire to the refrigeration unit. It should draw 5 to 6 amps when running - if more than 7 amps, the compressor is about to fail. To do this test, the unit must be running. It is sometimes possible with a failed compressor to see a quick movement of the ammeter to 10 amps. or higher.

4. COMPRESSOR RESISTANCE:
The best test to determine condition of the compressor field windings is to check their resistance with an ohmmeter*.
ie:
Resistance between terminals 1 and 2 is 0.2 ohms.
Resistance between terminals 4 and 3 is 0.2 ohms.
Resistance between terminals 2 and 3 is 3.5 ohms.

5. If the compressor tests bad, do not install a new module on it.

6. If the compressor checks out, have the Module tested



* Pin Locations:
Pin 1 is located at the 2:30 clock position, Pin 2 at 11:00, Pin 3 at 5:30, pin 4 at 8:30.
Take care in removing the connector plug from the compressor.
__________________
Gord May
~~_/)_~~ (Gord & Maggie - "Southbound")
"If you didn't have time/$ to do it right in the first place, when will you get the time/$ to fix it?"
 
Hi,

I'm a fridge / electronics engineer in the Poole area, and I'm happy to work on systems in-situ. Just google poolecool

Cheers, Ian
 
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