Multiplus-II GX / AC current sensor / AUX input wrong way around in documentation

Q&A and troubleshooting
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1

I happened to notice that the online documentation for the Multiplus-II shows the AUX 1 & 2 inputs in an ambiguous order. (I didn’t check my paper copy.)

In the Connection Overview in the appendix, the image shows the ports in order:

K1
Ext GND Relay
AUX 2
AUX 1
T-Sense
V-Sense

The table (just below the diagram) lists them as:

  1. Auxiliary power supply 12 V 100 mA
  2. Programmable open collector ooutput (K1) 70V 100mA
  3. External ground relay +
  4. External ground relay –
  5. Analog/digital (AUX) input 1 +
  6. Analog/digital (AUX) input 1 –
  7. Analog/digital (AUX) input 2 +
  8. Analog/digital (AUX) input 2 –
  9. Temperature sense +
    10 .Temperature sense –
  10. Battery voltage sense +
  11. Battery voltage sense -

I had configured and wired up according to the table, expecting to be using AUX 2, and the sensor showed my AC-coupled PV input reading maximum (~2.5kW) regardless of solar input. That in itself is quite an interesting and unexpected open-circuit behaviour.

Moving the wires to the next position along predictably fixed things.

Just thought I’d share the inconsistency in case it trips anyone else up.

2

What is printed next to the connections at the device?
I always use that as reference.

3

Yep. Absolutely.

I actually could not easily see, as the device is quite close to the floor. I guess I could have taken a snap on the phone.