Lamtec LT3-F User Manual

64
8 Correcting Faults
/16 The CO voltage does not demonstrate the required dynamism.
Change in the CO voltage U-CO less than 2.5% or 8 mV within 24 hours
whilst the O
2
or CO controller is running.
002 (HP)
102 (ÜP)
Probe heating fault
/1 The heater is short-circuited or has a high resistance; tolerance time of 10
seconds
Help:
- Check the wiring.
LT3-F Term. 13 and 14  disconnect the probe - probe heating at LT3-Ex
or in SAK
and measure the heater resistance between wire nos. 13 and 14
on the probe side.
Resistance approx. 9 ... 10  in heated state.
- If not OK, exchange the probe and restart.
- If OK, the fault presumably lies on the motherboard of LT3-F.
If the lines of the probe heating and probe signal are mixed up
during connection (possible in the case of the SAK wiring), the mother
board is destroyed. Disconnect the probe and measure the heating
voltage: approx. 11V
/2 Heating power more than 15 s outside of the permitted range
(8W … 25 W)
Help:
Installation site too hot: the heating capacity cannot be further reduced
(current actual value of R
i
< 20 ) to reached the setpoint value of the
internal resistance R
ki
of 20 or
Installation site too cold: the heating capacity cannot be further increased
(current actual value of R
i
> 20) to reached the setpoint value of the
internal resistance R
ki
of 20 . Check the value of the internal resistance
R
ki
in the display.
- Trigger the probe exchange and restart the probe so that the R
ki
of
20 can be learnt again.
- Check the system temperature at the installation site.
- Check the probe when removed if pertinent.
- Exchange  the worn probe if pertinent.
- As a follow-up fault, 002/3 Heater R
i
outside of 5 ... 15 might be
displayed.
/3 Heater R
i
outside of 5 ... 15 
Internal resistance of heater outside of the interval 5  ... 15 
Help:
Installation site too hot: the heating capacity cannot be further reduced
(current actual value of R
i
< 20 ) to reached the setpoint value of the
internal resistance R
ki
of 20 . Check the value of the internal resistance
R
ki
in the display.
- Trigger the probe exchange and restart the probe so that the R
ki
of
20  can be learnt again.
- Check the system temperature at the installation site.
- Check the probe when removed if pertinent.
- Exchange  the worn probe if pertinent.
As a follow-up fault, 002/2 Heating capacity outside of permissible interval
(8 W ... 25 W) for longer than 15 s might be displayed.
/4 OFF current too high

Lamtec LT3-F Specifications

General

Brand	Lamtec
Model	LT3-F
Category	Transmitter
Language	English