12v Power Supply

Testing the power of your refrigerator 12V or 24V

To start a refrigerator compressor requires a high level of current for a milli second. Any resistance in the wiring, or under-sizing of cables will drop below the voltage of the automatic cutting level when the compressor tries to start.

If the compressor is a Danfoss BD35 BD50 or a test fault diagnosis using an LED connected to the + terminal and the small D on the controller. If you have an older model, or a Danfoss BD2.5 ACC, first test the power supply using the guidelines below.

To test the power supply to a Danfoss or ACC switched 12V or 24V system, the following test procedure must be performed. This will confirm whether the electrical supply that feeds the system is free of evil, free and / or high resistance connections. Voltage reading on the board or the battery is empty, like the fact that you can get new batteries the size of your battery capacity of the battery bank is also irrelevant.

Process

1. Turn off the breaker (or remove the fuse) for supplying dc to the system.

2. Disconnect one of command led to the thermostat (if you can, make a little circuit to connect the terminals of the thermostat (C & T).

3. Using a multimeter, read and record the voltage across the terminals of the battery.

4. Then, connect the meter reading multi-voltage DC power supply terminals (+ and -) on the DC compressors, so it can stay connected and controlled.

5. Turn the breaker (or fuse) to the system.

6. Verify that the voltage is the same as the voltage seen at the battery terminals.

7. Watch the meter, reconnect the wire from the thermostat (or link to your circuit) and continuously monitor the voltage before, during and after the compressor starts or attempts to start.

Interpretation of food

aec If food is free of loose, bad, and / or high resistance connections, the voltage reading is very stable and only a slight decrease when the compressor starts. Typically, a 12V system of reading should not drop below 12V.

aec If, when the compressor tries to start, reading the voltage drop significantly, a poor electrical connection should be suspected. If the voltage drop is sufficient to fall below 10.5V (23v) cutoff built into the controller, the compressor stops. (At this stage, the voltage can return original play.) Fan (or in marine applications of the pump) will continue to operate for approx. 45 seconds and the compressor will attempt a new start. If the starting voltage is above pre 11.5V (23.5v) the compressor will start or try to restart again.

Warning If you use the meter is a digital model, the voltage may drop below 10.5 volts (23v) and then recover too quickly to register on the meter. This means that the compressor is trying to start, then stop because of the low voltage, the voltage returns to its "original value, and there is no significant reduction on the meter.

aec If the compressor starts and runs OK but stops after a short time, or when the charger is off, the voltage may be gradually falling below 10.5 volts (23v) the cutoff point when the Compressor tries to restart. This should be indicated on your meter.

aec If the nature of the misconduct is such that the voltage falls below 10.5 V reading (23v) even before the compressor tries to start, a very bad electrical connection should be suspected. This is because even small loads of fan or pump relay, both less than .5 amps (0.25 amps) is apparently sufficient to substantially reduce the tension.

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