I can see that each channel has a +V connector for the supply output, but where does the supply some from? Does it need to be connected to the +V & GND connector next to the NET/EXT Power jumper? If so, should the jumper then be set to EXT? Does this affect the power supply to the EL037 itself, which I planned to come via a NET cable from the EL005 logger. If the 24V supply for my sensors can come from the NET cable, how do I set the voltage to be 24V rather than 12V?
The logger is powered by a 12V (unregulated ) power supply , the network cable connecting the converters to the logger use a 4 wire cable (RJ11 connector 2 pins unused) , two carry data, one is 12V and one is ground.
If you want to power a sensor from the device you need to have the jumper connected. You cannot supply more than 12 V to your sensor from the network, also there is a current limit on the network so depending on the number of converters and length of cable you have you may not be able to power your sensor from the network, there is a limit of 100mA on the network. It is generally advisable to power the device externally.
Yes you can supply 24V either directly into the Voltage pins for a each channel or via the 2pin terminal block, just make sure that the jumper is disconnected or just hanging of one of the pins.