RayTek MARATHON FA - Fail -Safe Operation

Maintenance
46 MarathonSeriesFA/FR
10.2Fail‐SafeOperation
TheFail‐Safesystemisdesignedtoalerttheoperatorandprovideasafeoutputincaseofanysystem
failure.Basically,itisdesignedtoshutdowntheprocessintheeventofaset‐uperror,systemerror,or
afailureinthesensorelectronics.

The Fail‐Safe circuit should never be relied on exclusively to protect critical heating
processes.Othersafetydevicesshouldalsobeusedtosupplementthisfunction!
When an error or failure does occur, the displayindicatesthe possible failure area,and the output
circuits automatically adjust to their lowest or
highest preset level. The following table shows the
valuesdisplayedontheLEDdisplayandtransmittedoverthe2‐wayinterface.
Symptom Error Code
Priority
Heater control temperature over range ECHH 1 (high)
Heater control temperature under range
ECUU 2
Internal temperature over range EIHH 3
Internal temperature under range EIUU 4
Temperature under range EUUU 5
Temperature over range EHHH 6 (low)
Table9:ErrorCodesin1‐ColorMode(FA models)
Condition 2-Color 1-Color
(wide band)**
1-Color*
(narrow band)**
Priority
Heater control temperature over range ECHH ECHH ECHH 1 (high)
Heater control temperature under range ECUU ECUU ECUU 2
Internal temperature over range EIHH EIHH EIHH 3
Internal temperature under range EIUU EIUU EIUU 4
Wide band detector failure EHHH EHHH <temperature> 5
Narrow band detector failure EHHH <temperature>
EHHH 6
Energy too low EUUU <temperature>
<temperature> 7
Attenuation too high (>98%) EAAA <temperature>
<temperature> 8
Attenuation too high >95%
("dirty lens", relay will go to “alarm” state)
<temperature>
<temperature>
<temperature> 9
2-color temperature under range EUUU <temperature>
<temperature> 10
2-color temperature over range EHHH <temperature>
<temperature> 11
1-color temperature (wide) under range <temperature>
EUUU <temperature> 12
1-color temperature (wide) over range <temperature>
EHHH <temperature> 13
1-color temperature (narrow) under range <temperature>
<temperature>
EUUU 14
1-color temperature (narrow) over range <temperature>
<temperature>
EHHH 15 (low)
* only available through RS485
** Wide and narrow band stands for the first and the second wavelength in 2-color mode
Table10:ErrorCodesin2‐ColorMode(FR models)