BMX AMI 0810 analogue channel polarity

[andreychukvolodymyr]

Dear Sirs

please advice in such matter:

The BMX AMI 0810

  

 

is installed for ballast water treatment system on board the ship. 

there are 4 tro sensor to control the concentration the ozon in ballast water.

ETRO HALOGEN D01 Display send the analogue signal to The BMX AMI 0810 channel 1. cables were disconnected and did not marked.(((

how to recognize what polarity should be on cables.( el.digrams are not actual because system was updated but without doc. records).

voltage on inputs  analogue is 0. then cables are disconnected from tro display. according to tro display output signal is 4-20mA . 

there are no possibility to check configuration of the channels.

is it dangerous to cross the polarity for damage the channel? and how possible to recognize proper connection?

can be that tro display creates a voltage signal and plc channel transfer to receive the voltage together with mA current (COM receive the + signal ?

   

best regards

[aj-emkj]

Hello, 

 The AMI810 have insulated com terminals and should be reverse polarity protected, I have switched the wires before without damaging the channel.

 When measuring mA inputs, you need to bridge the VIx and IIx, like the example below on the Schneider diagram.   

The AMI800 and AMI810 does not supply 24 VDC to the sensor/transmitter, you need to power them from your own power supply, like shown on the green drawing. 

[aj-emkj]

Just clarifying, the module HAS reverse polarity protection, you dont need to do this yourself.