Rohde TC 304 Notice D'utilisation page 12

Event E A1 · Error on sensor input
An error on the sensor input causes the controller to switch off (e.g. overflow in
measuring range). The error will only be reset when a program is restarted.
Possible causes:
• Thermocouple or wiring interrupted
• Maximum temperature of the controller has been exceeded
• Thermocouple reversed (temperature display "UNDER")
Event E A3 · Safety circuit operational
When the maximum program temperature is exceeded by more than 20°C, the
safety circuit becomes operational, and switches the kiln off. This prevents your kiln
from overfiring.
Possible causes for over-temperature:
• Kiln safety contactor stuck in "ON" position
• Contactor is permanently operational
Event E A4 · Heating rate too low on full power
This error message refers to a kiln problem.
Possible causes:
• Defective mains fuse or phase, broken heating elements
• Heating elements too old (high temperatures)
• Thermocouple or thermocouple wiring short-circuit
• Defective contactor (often occurs during firing process)
Event E A5 · Kiln does not follow programmed heating rate
Other than Event A4, values for the heating rate have been set too high and the kiln
cannot follow the programmed values. This message is displayed only if enabled
in the configuration.
Event E A8 · Rate has been continued automatically
If the kiln cannot follow the heating rate, the ramp up is stopped. If the controller
finds the kiln is unable to catch up with the temperature the firing will continue, and
this message will be displayed for one minute.
10 10
Event E A9 · SKIP ramp interrupted
If the controller failed to reach the end temperature in an uncontrolled ramp up it
will continue with the next segment. This message is displayed for one minute to
inform the user.
Event E B3 · Firing process interrupted after power failure
After re-establishing power supply, the firing process has been interrupted because,
for example, the kiln temperature has dropped too much. A digit shown after the
comma will provide further information concerning the cause (e.g. B3.4 = tempe-
rature dropped too much). If this message is displayed immediately after the con-
troller has been turned on, you may ignore it. This indicates that the controller was
turned off while the firing process and program were still operational. You can
continue by entering a program.
Event E B2
The firing process continues after power failure if the temperature has not dropped
by more than 50 °C.
Event E B4
The ambient temperature of the controller has exceeded 55 °C. Check room ven-
tilation, the controller is possibly too far away from the kiln.
Display OVR
There is no connection to the thermocouple. The thermocouple is defective, not
connected, the measuring line has been disconnected or the plug contacts are
dirty or defective ("overrun" = measuring range overflow).
Display UDR
The thermocouple has been reversed or a wrong thermocouple type has been
connected ("underrun").
11 11