Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 347)

Publication 900-UM007D-EN-E - January 2011
Troubleshooting & Error Indication 6-7
Timing Status Meaning Countermeasures Page
During operation
(Continued) Temperature error is
large
Input error (S.err
display) Thermometer has burnt
out or short-circuited. Check whether the thermometer has burnt out or
short-circuited —
Thermometer lead
wires and power lines
are in the same
conduit, causing noise
from the power lines
(generally, display
values will be
unstable). Wire the lead wires and power lines in separate
conduits, or wiring using a more direct path. —
Connection between
the Temperature
Controller and
thermocouple is using
copper wires. Connect the thermocouple’s lead wires directly,
or connect a compensating conductor suitable for
the thermocouple. —
Installation location of
thermometer is
unsuitable. Check whether the location of the thermometer is
suitable. —
Input shift is not
configured correctly
(default: 0
°C)
Set a suitable input shift. If input shift is not
required, configured the input shift value to 3. 4-1
Keys will not operate Setting change protect
is ON. Turn OFF setting change protect. 4-33
Cannot shift levels Operations limited due
to protection. Set the operation/adjustment protect, initial
setting/communications protect, and setting
change protect values as required. 4-33
After long service
life Control is unstable Terminal screws may
be loose. Retighten terminal screws to the torque
recommended in Section 2 for your controller. 2-17
The internal
components have
reached the end of
their service life. The Temperature Controller’s internal electrolytic
capacitor depends on the ambient temperature,
and load rate. The structural life depends on the
ambient environment (shock, vibration). The life
expectancy of the output relays varies greatly
with the switching capacity and other switching
conditions. Always use the output relays within
their rated load and electrical life expectancy. If
an output relay is used beyond its life expectancy,
its contacts may become welded or burned.
Replace the Temperature Controller and all other
Temperature Controllers purchased in the same
time period. —