Fail -Safe Operation - RayTek MARATHON FA Operating Instructions Manual

Maintenance
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.
Condition
Heater control temperature over range
Heater control temperature under range
Internal temperature over range
Internal temperature under range
Wide band detector failure
Narrow band detector failure
Energy too low
Attenuation too high (>98%)
Attenuation too high >95%
("dirty lens", relay will go to "alarm" state)
2-color temperature under range
2-color temperature over range
1-color temperature (wide) under range
1-color temperature (wide) over range
1-color temperature (narrow) under range <temperature> <temperature> EUUU
1-color temperature (narrow) over range
* only available through RS485
** Wide and narrow band stands for the first and the second wavelength in 2-color mode
46
Symptom
Heater control temperature over range
Heater control temperature under range ECUU
Internal temperature over range
Internal temperature under range
Temperature under range
Temperature over range
Table 9: Error Codes in 1‐Color Mode (FA models)
2-Color
ECHH
ECUU
EIHH
EIUU
EHHH
EHHH
EUUU
EAAA
<temperature> <temperature> <temperature>
EUUU
EHHH
<temperature> EUUU
<temperature> EHHH
<temperature> <temperature> EHHH
Table 10: Error Codes in 2‐Color Mode (FR models)
Error Code Priority
ECHH 1 (high)
2
EIHH 3
EIUU 4
EUUU 5
EHHH 6 (low)
1-Color 1-Color*
(wide band)** (narrow band)**
ECHH ECHH
ECUU ECUU
EIHH EIHH
EIUU EIUU
EHHH <temperature>
<temperature> EHHH
<temperature> <temperature>
<temperature> <temperature>
<temperature> <temperature>
<temperature> <temperature>
<temperature>
<temperature>
Marathon Series FA/FR
Priority
1 (high)
2
3
4
5
6
7
8
9
10
11
12
13
14
15 (low)