6 Installation
6.1 Qualified Users
Users should ensure that they are suitably trained and qualified prior to working on
the RTU.
6.2 AC Powered Models
The AC supply should be isolated prior to opening the enclosure and should not be
reconnected until the enclosure lid is secured.
The AC Power Supply should be rated at 230 Volts or 115 Volts, operating at a
frequency of 50Hz.
The power supply to the RTU should be:
▪ Connected via a switch or circuit breaker.
▪ Close to the RTU and within easy reach of an operator.
▪ Marked as the disconnection device for the RTU.
6.3 DC Powered Models
The DC Power Supply should be rated at 12 Volts or 24 Volts.
6.4 Procedure
The following steps must be completed in the order set out below.
1. Configure the NX12 prior to installation (this may be done at the factory).
2. Connect the external equipment to be monitored to the I/O terminals on the
NX12.
3. Connect the auxiliary power supply (do not switch it on yet).
4. Connect the battery (if one is required).
5. Secure the NX12 lid (for units with an enclosure).
6. Switch on auxiliary power. Confirm that the NX12 RTU successfully
communicates with the iHost system.
7. Test the unit by confirming that all inputs and outputs report the correct
status and events.
8. Confirm that at least two calls to the iHost system are successful (this ensures
that the settings are synchronised).
9. If a lithium battery is included:
▪ Remove the auxiliary supply and confirm that the RTU continues to operate
using battery power.
▪ Restore the auxiliary supply.
6.5 Circuit Board Layout
The Printed Circuit Board (PCB) hardware is manufactured as shown in the diagram
below.
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