SECTION 30: TROUBLESHOOTING
Please observe all safety warnings and precautions at the front of this handbook and in sections 0 and
Error! Reference source not found..
30.1 SOLVING COMMON PROBLEMS
30.1.1 POWER & BATTERY PROBLEMS
30.1.1.1 Instrument does not power up?
Check the integrity of the power supply up to the unit and that it is within the
acceptable limits (See Section 25.1 “Power Supply”).
AC mains powered units: -
Check that the 20mm fuses in the instruments IEC mains inlet are good and of the
correct size and type (See section Error! Reference source not found.).
DC 24V powered units: -
The 24V DC power supply to the unit is protected by a ‘PTC Resettable Fuse’ if the fuse has
‘blown’ the unit needs to be powered down for more than 1 minute to reset the fuse, before powering the
unit up again.
Power down the unit for 2 minutes before trying again.
30.1.1.2 Instrument power fuses keep blowing?
If the AC power fuses or 24V DC fuse blow regularly the most likely cause of the problem is the
external wiring.
Check that the external wiring is correct and is without faults.
Check that none of the unit’s inputs or outputs are being overloaded.
Check that the 20mm fuses in the instruments IEC mains inlet are good and of the
correct size and type (See section Error! Reference source not found.).
If the power supply is of poor quality, internal circuits for suppression of voltage transients may
prematurely age the fuses and cause them to blow.
30.1.1.3 Loss of data?
Registers - The unit utilises Ferroelectric (FRAM) to store its configuration and
registers. These devices have a minimum data retention period of 10 years (T
A
= -40°C to
+85°C).
Real Time Clock (RTC) - The unit contains one lithium battery that allows the RTC to
function even when the unit is not powered. If the unit losses date/time information after the unit
has been turned off, it is quite likely that the battery will need replacing. Typically, the battery will
support the RTC for a minimum of 3 years.
See section 0 for information on battery storage life and data retention times.
Refer to Section 27.3 for information on battery replacement.
30.1.2 DISPLAY PROBLEMS
Any front panels should display a start-up message as soon as they are powered up, but it will
take about 5 to 10 seconds for the application software to run up and start updating the display: -
If none of the LED’s or LCD light up soon after power up, check the integrity of the
power supply (See above).
Power down the unit for 2 minutes before trying again.
If the LCD contrast is not satisfactory, refer to section 27.5.1 and adjust the contrast.
30.1.3 SERIAL PROBLEMS
If the serial link has never worked then double-check the wiring. Connection terminology for
RS422 and RS485 does vary between manufacturers and causes a lot of confusion.
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