This can happen when there is a mixed use of old and new batteries together. In this case there is the possibility that battery B will get a negative voltage. When this is the case, it is possible that battery B will be further discharged by forced current from battery A. When battery A (high electrical capacity not yet drained) and battery B (low electrical capacity nearly depleted) are discharged in series, battery A will still have a lot of remaining capacity whilst battery B is near depletion.
Make sure the charging cables are wired properly. To get the 24 volts of power with a 12 Volt battery, you will need to charge two batteries at once. This is a rare phenomenon that can happen at the end of a discharge with 2 or more batteries in series. Analog Battery Meter: Analog battery meters are more common on older carts, but they can also be used on some less costly modern models.
ANALOG 12V BATTERY METER HOW TO
If they are switched, there will be a negative voltage. Learn how to use a multimeter to test a car battery or measure battery. If the poles of your voltmeter are correctly connected, there is a possibility that the battery suffered.
ANALOG 12V BATTERY METER PLUS
Make sure that the plus pole and the minus pole are measured with the corresponding measuring ends of the voltmeter. If they are switched, there will be a negative voltage. A very rough approximation of cell charge - hydrometer is best.There are several reasons why this can happen: Will help protect battery by monitoring for low cell voltage when discharging - prevents reversed cell.ģ. Sum of cell voltages = line voltage (either from battery or charger) THIS will also tell you if charger is operating ie 13.5 or so vs 12 or so.Ģ. volt in a 12V system, the meter must have good resolution and accuracy. This wlll give you several readouts that may or may not be important to youġ. positive cable from all batteries to eliminate. IF the charger continue with your thinking it is good and will be OKĪND you can get into each cell connection (not a sealed or automotive type battery) you may be better off monitoring each cell voltage. What are you really concerned about - the battery charger operating or the battery itself? I have tried using the R=V/I to get the size of the resistor at 20mA but when i tries this the current i got going into the analogue module was about 1mA.Can anyone give me the neates solution. I want to know whats the best way to do this and what should i consider. I have a micrologix 1100 and want to use its analogue input to measure a 12v battery voltage level using resistors. Any adjustment needed for accommodating the not quite R:2R ration can be done when re-scaling back to 0-15V measured. Although not exactly R:2R ratio, the measurement can be scaled yet again in the PLC back to the 0-15V signal. I would suggest the two resistors are 10K and 22K. And dont have them too high so that the high impedance of the voltage input becomes a factor. Resistance values are not really important, but don't take them too low, so as not to draw too much current from the battery.
ANALOG 12V BATTERY METER SERIES
15V applied to the outer of the series resistors, will see 10V at the midpoint of them. Now all we need to do is "scale" that signal voltage to present 0-10V dc to the voltage analog input.Ī simple potential divider consisting of 2 resistors, in a ratio of R:2R is all that is required, see the attached picture. The standard (2) analog inputs are 0-10V dc input, so to measure your 12V battery (which I will assume could be higher when charging), I would target your signal range at 0 to 15V dc.
Whichever model of MicroLogix 1100 you are using, and whether you use expansion I/O or the inbuilt analog inputs, they can be selected to be Voltage input, which have a high impedance, and will not draw any significant current.
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