LTH Electronics HPT63, Руководство по эксплуатации

Страница: 47 / 68

14 Fault Finding
39
14 Fault Finding
NOTE : THERE ARE NO USER SERVICEABLE PARTS INSIDE THE UNIT
The HPT63 has been designed to include a wide range of self diagnostic tests, 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 in Appendix F – Error Messages gives a list of
the error messages that the HPT63 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.
•
Serial number of the instrument,
•
The approximate date of purchase.
•
Details of the program settings and application
•
Electrical environment and supply details
•
Circumstances under which the fault occurred.
•
The nature of the fault or faults
•
Any error messages that are displayed
•
The sensor type, cable length and type
•
Current output configuration
•
Relay connection configuration
•
Software version.
It is often worthwhile to check the measurement by an independent method, for
example using a handheld meter. (See also
Section 2.2 Noise suppression. )
The Instrument Appears Dead
Check that power is available to the unit. Using a voltmeter, set to AC or DC (as
appropriate), check the power supply voltage at the connector. The unit can accept
from 15 to 30V AC or DC. Check that the power cable is securely and correctly
attached – wired as detailed in
Section 3.4 Connections . 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
1. Ensure that the sensor and temperature inputs are correctly connected (wall-
mounted version only, see Section 3.4 Connections ) and that the sensor is
not faulty or damaged.