Wednesday, February 15, 2012

Still Testing the CellLog8s

After the previous experiments with the CellLog8s alarm output, I posted a query on the RC Groups forum where the manufacturer provides support for the range of Junsi chargers and cell monitors.

They looked at my video and blog entry and suggested that the problem might have been a grounding problem in my wiring of the LED to the alarm port.  The alarm port negative needs to be referenced to the cell negative.

So here's my update on the situation.  I wired the LED +ve into the cell +ve terminal.  The negative of the LED goes to the +ve alarm port and the -ve alarm port goes to the cell -ve terminal.  The chargers are all connected to the same points too.
You can see the LED and its connection points in the photo above.

In the photo below you can see the problem.
 The alarm was set to trigger when the pack Voltage exceeded 3.65V.  It's now 3.95V as shown on the charger and the logger display is showing 3.973V, alternating with the alarm status "over".  But at the same time, it's not beeping an alarm and the LED connected to the normally closed alarm output is ON (indicating no alarm condition).

Here's today's video showing the erratic behaviour of the alarm port and beeper.

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