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9
START UP AND INFREQUENT MEASUREMENTS
The MTL831C/MTL831C-PS enters a startup process after power is applied. Normal
operation begins about 60 seconds after power is applied. Thermocouple resistances
(for burnout detection) and CJC (Cold Junction Compensation) temperatures are
being measured frequently during startup. Afterwards these measurements are
made infrequently (on the order of minutes). See section 4.5 for information on
Thermocouple Burnout Detection.
10
FAULT-FINDING IN THE MTL831C/MTL831C-PS
The following are some tips when the system does not seem to be functioning
correctly. If you are still unable to solve the issue, please contact Eaton Technical
Support for help.
The POWER light is not ON or blinking
•
There is not adequate power for the unit to function. Using a Voltmeter,
measure the voltage at the data highway "+" and "-" terminals and verify
that it meets the minimum voltage specification. A margin of at least 1 volt
over the minimum is recommended.
•
The unit is faulty. Please contact Eaton for further assistance.
The COMM light comes on and does not blink
•
Two MTL831C/MTL831C-PSs are at the same address. If there is more than
one MTL831C/MTL831C-PS (there should never be more than 2), one and
only one of them should have a jumper wire between the two ADDRESS
pins (A, S). When two MTL831C/MTL831C-PSs are at the same address
whichever one powers up first will be communicating with the MTL838C.
The other unit recognizes its address already being used and remains idle.
•
No communication signal is getting to the MTL831C/MTL831C-PS. There can
be multiple reasons for this:
• In an IS installation, power for the MTL831C/MTL831C-PS is coming from
the MTL5553.
If the MTL838C is not powered or not connected properly no signal will
get to the MTL5553 to be passed to the MTL831C/MTL831C-PS is.
• For non-IS installations, power comes from the MTL838C, so it is
possible the MTL838C has stopped communicating. Investigate by
connecting to the MTL838C with a USB cable, PC, and the PC Software.
It may be necessary to repower the MTL838C.
• The MTL831C/MTL831C-PS has stopped receiving communication. Try
disconnecting it and reconnecting it to reboot it. The data highway cable
is too noisy for the MTL831C/MTL831C-PS to communicate with the
MTL838C. Inspect the data highway cable run and make sure it is not
near power cables, VFDs, VFD controllers, or other high current noise
producing cables and equipment.
• The unit is faulty. Please contact Eaton for further assistance.
The ERROR light comes on periodically
•
The light flashes regularly every one or two seconds. If this persists,
you may see the unit reboot – see section 6.1. Power cycle the unit by
disconnecting and reconnecting the data highway cable if this happens
and keeps recurring. The failure of a firmware update process which would
have been initiated from the PC software could also cause this. The
solution would be to try the firmware update process again. If that fails to
remedy the issue, the unit could be faulty. Contact Eaton for assistance.
•
The light flashes randomly or often. This is likely a CRC error on packet
receipt (bad packet). The following are the potential causes:
INM MTL831C Rev 7
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