Novatech Controls 1730 Series Diagnostics Mode Reference Manual
Document Revision 1.03 Page 1 of 16 Diagnostics Mode v1.08
What is Diagnostics Mode
The 1730 Series Transmitter is a microprocessor driven controller designed by Novatech Controls that
can be pre-loaded with several different firmware versions to suit various applications.
In standard operation the 1730 Series Transmitter runs a real-time operating system; a loop of
automated tasks which involve several highly inter-connected systems. Due to this closely integrated
nature, it can be difficult to isolate and diagnose specific hardware problems. For this reason, the
purpose of the Diagnostics Mode is to halt all other processes and isolate each particular piece of
hardware or specific sub-system so that it can be individually tested.
This reference manual covers the all aspects of the Diagnostics Mode, describes how the transmitter
should respond to various tests, and provide detailed technical advice on what may be the likely cause
of various fault conditions.
Finally it must be noted that fault diagnosis will often require a high level of electronic knowledge,
access to datasheets, schematics, various equipment including a digital multimeter (DMM), Multi-
function calibrator, and for some tests an oscilloscope. Repair may require access to replacement parts
and specialised equipment including surface-mount soldering equipment.
Please read the warnings and considerations below before continuing.
High Voltage Warning
In order to test the heater and purge/cal solid state relays (SSRs) the transmitter must
switch them on. This will only occur in the tests that are specifically required to test the
SSRs, and should only pulse the output for a maximum of 30ms each second. During this
time the outputs will be connected to live mains.
It is safe to leave oxygen probes connected during these tests, they will not be damaged or heat up
more than a few degrees. For testing the mains current feedback transformer it is actually required that
an oxygen probe is present.
Considerations Before Running the Diagnostics Mode
Be advised that while in Diagnostics Mode the transmitter will be offline and all standard
operations such as reading and re-transmitting of process variables will be stopped. It
may however for the purposes of testing still retransmit various signals over the 4-20mA
outputs, digital communications systems, energise the relay outputs, purge/cal solenoids
and heater power outputs.
Before you proceed if you have any control systems connected to the 1730 transmitter you should
disconnect these from the transmitter or consider what affect this may have if left connected.
NOTE: Before proceeding, please ensure you have read the relevant sections of the manual, have the
required electrical qualifications and have obtained any required authorization before proceeding.
Abbreviations Used Throughout this Manual
DMM – Digital Multimeter. Testing tool, supplied by the technician
MCU – Microprocessor. For the 1730 series transmitter this refers to component IC17, located
on the lower central part of the main board.
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