LTH MOD53 - Fault Finding and Troubleshooting; Instrument Power and Access Code Issues

15 Fault Finding
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15 Fault Finding
NOTE : THERE ARE NO USER SERVICEABLE PARTS INSIDE THE UNIT
The MOD53 has been designed to include a wide range of self diagnostic test,
some of which are performed at switch on, and some on a continuous basis. This
guide aims to provide a route to diagnosing and correcting any faults that may
occur during normal operation. The table shown, gives a list of the error messages
that the MOD53 generates, along with their probable causes. If the fault has
not been cleared after these checks have been made contact LTH. Please have
as much of the following information available as possible in any communication
with LTH, to enable quick diagnosis and correction of the problem.
1. Serial number of the instrument,
2. The approximate date of purchase.
3. Software Version (Displayed at Switch On)
4. Details of the program settings and application
5. Electrical environment and supply details
6. Circumstances under which the fault occurred.
7. The nature of the fault or faults
8. Any error messages that are displayed
9. The sensor type, cable length and type
10. Current output configuration
11. Relay connection configuration
It is often worthwhile to check the measurement by an independent method, for
example using a handheld meter. See also Noise Suppression.
The Instrument Appears Dead
Check that power is available to the unit . Use an appropriate voltmeter to check
that the power supply voltage at the connector is within the limits defined on the
connector label. Check that the power cable is securely and correctly attached.
There are no user serviceable fuses fitted within this unit.
The Access Code Does Not Work
It is probable that the access code has either been changed or the operator does
not recall the code correctly. Contact LTH or your local distributor should this
problem arise.
The Sensor Reading Is Constantly Over-range or Under-range
♦
Ensure that the sensor and temperature inputs are correctly connected, and
check that the sensor is not faulty or damaged.
♦
Check that the correct probe type has been selected ensure all probe
protective caps have been removed.
♦
Check that any junction boxes used are correctly connected.
♦
Check for damaged or broken cables.